CN1784016A - Intra prediction apparatus - Google Patents
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Abstract
To provide an intra prediction apparatus which is capable of lightening computational load while contributing to improvement in picture quality and encoding efficiency. An intra prediction apparatus 11 includes: a candidate narrowing-down unit 111 which narrows down, from a plurality of intra prediction directions, an intra prediction direction candidate which is applied to a block of multiple pixels that constitutes a video in accordance with a characteristic of the video; and an intra prediction execution unit 112 which executes intra prediction in the intra prediction direction narrowed down by the candidate narrowing-down unit 111. Through this, computational load can be lightened while contributing to improvement in picture quality and encoding efficiency.
Description
Technical field
The present invention relates to a kind of intra prediction apparatus that can be used for animation compression etc., also relate to the technology that is used for reducing the intra-prediction amount of calculation as a kind of cartoon compressing method.
Background technology
In recent years, along with popularizing and dropping of the communications infrastructures such as broadband with prices such as the mass storage device headed by personal computer, HDD and the DVD etc., storage cards, the environment that ordinary consumer is edited, stores, transmits, carried image possesses, and the user is more and more.
So, the scene of ordinary consumer processing image is increasing on the one hand, but on the other hand, even personal computer improves constantly performance now, still can not obtain more performance aspect image processing.For example, if amount of image information is very many, still need a lot of times even use high performance personal computer to carry out the animation compression so.As the strategy that addresses this problem, can consider to handle the high efficiency computational methods of same-code performance with amount of calculation still less.In addition, if carry out high efficiency calculating, owing to reduced power consumption, so can alleviate of the restriction of portable equipment for taking photograph equipment battery life for photography time.As background, thereby can constantly seek more high efficiency animation compress technique.
Wherein, the new international standard animation compliant compression that produces H.264 (for example, with reference to non-patent literature 1) is a purpose to improve picture quality and code efficiency, has adopted multiple cartoon compressing method.In addition, H.264 have by more multiple Forecasting Methodology successively, and the feature of selecting the best Forecasting Methodology of code efficiency to encode.
For example, under the situation that 16 * 16 pixel macroblock that comprise in to picture I shown in Figure 1 are encoded, each piece of cutting apart 4 * 4 pixels that macro block obtains by 16 parts is carried out intra-prediction from a plurality of directions, simultaneously, macro block is carried out intra-prediction from a plurality of directions.
As its representational example, 4 * 4 intra-predictions are selected the best Forecasting Methodology of code efficiency by more multiple Forecasting Methodology.
In this Forecasting Methodology, as shown in Figure 2, existence is calculated predicted pixel values according to top MB (macro block) and is predicted the predictive mode 0 (vertically) of vertical direction pixel value, calculate the predictive mode 1 (level) of predicted pixel values and prediction level direction pixel value according to adjacent MB, calculate predicted pixel values and prediction in the predictive mode of predicting on the direction that departs from horizontal direction ± 22.5-44.5 degree 8 (level-on) according to adjacency MB, predictive mode 6 (level-down), predictive mode 4 (diagonal angle-down-right side), calculate predicted pixel values according to adjacency MB and predict the predictive mode of predicting on the direction of offset from perpendicular ± 22.5-44.5 degree 5 (vertical-right side), predictive mode 7 (vertical-left side), the prediction processing of 8 directions of predictive mode 3 (diagonal angle-following-left side), add by the predictive mode 2 (on average) on average predicting, 9 kinds altogether according to adjacency MB pixel value.
Equally, 16 * 16 intra-predictions also have multiple Forecasting Methodology.In this 16 * 16 intra-predictions, has 4 kinds Forecasting Methodology on the identical type.
For 16 * 16 intra-predictions, as shown in Figure 3, there is the Forecasting Methodology of predictive mode 0 (vertically), predictive mode 1 (level), predictive mode 2 (on average), predictive mode 3 (plane).
Therefore, in existing intra prediction apparatus, as shown in Figure 4, if input picture I, so just to piece 0 calculating about the predicated error of 9 kinds of predictive modes (absolute value difference and).Just, for 9 kinds predictive mode, all calculate the difference value of reference pixels and coded object pixel and absolute value difference and.Thereby intra prediction apparatus uses the prediction of predicated error minimum as intra-prediction.
In case the intra-prediction of end block 0, intra prediction apparatus just turn back to above-mentioned identical processing, and the intra-prediction of execution block 1～piece 15.
In case the intra-prediction of end block 15, just to this macro block all calculate on 4 kinds of predictive modes difference value between reference pixels and the coded object pixel and absolute value difference and.Thereby intra prediction apparatus uses the predicated error minimum, just, for example use the absolute value difference of each piece and sum and the absolute value difference of macro block and less one as intra-prediction.That is, the absolute value difference of each piece and total little situation under, the difference value of relevant each piece of intra prediction apparatus output.In contrast, under the absolute value difference of macro block and little situation, intra prediction apparatus is exported the difference value of relevant macro block.
So come picture I is carried out data compression.
But, as as shown in the above-mentioned example, in existing intra prediction apparatus, as present disclosed international standard, in the animation compress mode intra-prediction H.264, (4 * 4 intra-predictions are 9 kinds to multiple Forecasting Methodology by being used for improving image quality, in 16 * 16 intra-predictions be 4 kinds) make predicted picture, owing to from various Forecasting Methodologies, select only Forecasting Methodology, just owing to selected the highest processing of code efficiency according to the result in when coding, so can not avoid image quality to improve, code efficiency improves and the increase of the encoding calculation amount that causes, thereby has increased expense and calculated load.
Therefore, now in order to realize the high efficiency animation compress technique of high image quality, need to reduce the encoding calculation amount H.264 of optimizing picture quality.
[non-patent literature] " advanced video coding that H.264 is used for common audiovisual service " (" H.264Advanced video coding for generic audiovisual services ", the distribution of ト リ ケ Star プ ス publishing house).
Summary of the invention
At this, it is a kind of when helping to improve image quality, code efficiency that the object of the invention is to provide, and can reduce the intra prediction apparatus of calculated load.
In order to realize relevant purpose, the inventor finds through the research back: is using usually under the situation that the pixel of macro block (below simple be MB) is predicted, comparing with the distance of the pixel of adjacency MB, the correlation between pixel becomes lower.In the correlation between considered pixel not, use all prediction direction to carry out under the situation of intra-prediction, the inventor notices that prediction direction that use does not have to help to code efficiency carries out intra-prediction and can produce useless processing.In addition, the inventor is also noted that if one meaning ground carries out intra-prediction not contrasting picture characteristics, and existing to carry out for code efficiency not have the prediction direction processing etc. of help needn't problem to be processed.
In addition, systematically handling prediction direction to reduce the method that intra-prediction is handled, the problem below existing.For example, in 4 * 4 intra-predictions, at first estimate the prediction by horizontal direction and vertical direction, according to this result, the prediction direction of evaluation next time is carried out in decision.In this scheme, the inventor notices, even under the situation that code efficiency is not had help in the prediction of knowing vertical direction in advance, also need to estimate once more by vertical direction, thereby has the problem of carrying out prediction by unwanted vertical direction.
According to these lime lights, expected the present invention.
In order to address the above problem, relevant intra prediction apparatus of the present invention is characterised in that and comprises: be used for limiting the candidate device for limiting of the intra-prediction direction candidate that is applicable to a plurality of block of pixels that constitute this view data and use the intra-prediction direction that is limited by described candidate device for limiting to carry out the intra-prediction final controlling element of intra-prediction from a plurality of intra-prediction directions of the feature that is adapted to view data.
Just, the present invention according to the characteristics of image, has omitted processing that is harmful to for code efficiency and the processing that does not create a difference in advance on code efficiency when carrying out intra-prediction.
Thus, when helping to improve image quality and code efficiency, can alleviate calculated load.
In relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that can be according to the candidate that limits the intra-prediction direction as the pixel aspect ratio of described characteristics of image.
In addition, in relevant intra prediction apparatus of the present invention, described aspect ratio is characterised in that and can imports machine and obtain from any one of resulting information inside and outside the video flowing from picture signal.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that use according to the level between the adjacent pixels of described pixel aspect ratio in original image and the vertical range confidence level as the prediction of the horizontal direction of intra-prediction and vertical direction, limits intra-prediction direction candidate.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that whether to be interlacing scan and anyly coming according to the candidate as the picture tectonic information qualification intra-prediction direction of described characteristic image data of lining by line scan by expression.
In addition, in relevant intra prediction apparatus of the present invention, described picture tectonic information is characterised in that and can imports machine and from either party acquisition of resulting information inside and outside the video flowing from picture signal.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, represents under the interleaved situation at described picture tectonic information, can from candidate, preferentially get rid of vertical-right of being included in the described intra-prediction direction and vertical-left to.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, represent under the interleaved situation at described picture tectonic information, can from candidate, preferentially get rid of the vertical-right that is included in the described intra-prediction direction, vertical-left to and diagonal angle-down-right and diagonal angle-down-left to.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, represents under the interleaved situation at described picture tectonic information, can preferentially get rid of the mean direction that is included in the described intra-prediction direction from candidate.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, represents under the interleaved situation at described picture tectonic information, can preferentially get rid of mean direction and the vertical direction that is included in described intra-prediction direction from candidate.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, when encoding, can limit the intra-prediction direction candidate corresponding to the picture tectonic information in the picture level self adaptation (Pict-Level Adaptive) of using relevant animation compress mode.
In addition, in relevant intra prediction apparatus of the present invention, described picture tectonic information is any one in a structure and the frame structure, described candidate device for limiting is characterised in that, at the macro-block-level self-adaptive (MB-Level Adaptive) that uses relevant animation compress mode when encoding, when by switch a constructional a pair of macro block to the constructional a pair of macro block of frame when predicting, can be corresponding to this macro block to being that a structure or the information of frame structure limit the intra-prediction candidate.
In addition, in relevant intra prediction apparatus of the present invention, described candidate device for limiting is characterised in that, can limit the candidate of intra-prediction direction based on to coded sequence original image or the resulting result of coded image formerly.
According to above-mentioned, can easily limit the candidate of intra-prediction direction.
In addition, in relevant intra prediction apparatus of the present invention, be characterised in that preceding 1 original image of the image that can use coded object or coded image are as coded sequence original image or coded image formerly.
Thus, this formerly the correlation between the image of original image or coded image and coded object can uprise, and can accurately limit the intra-prediction direction.
In addition, in relevant intra prediction apparatus of the present invention, be characterised in that described result is from the resulting dynamic vector of coded sequence coded image formerly, described candidate device for limiting can limit the candidate of intra-prediction direction based on the direction of described dynamic vector.
Thus, in image, exist under the situation of animation, can be accurately and from known dynamic vector, get rid of the low intra-prediction direction candidate of correlation efficiently.
In addition, in relevant intra prediction apparatus of the present invention, be characterised in that,, can use about the expression position identical, comprise this space same position position on every side and the dynamic vector of any one unit area of integral image with the space of the macro block of coded object as described dynamic vector.
Thus, precision can be improved, and the low intra-prediction direction candidate of correlation can be from this dynamic vector, got rid of accurately and efficiently for the dynamic vector of coded object macro block.
In addition, in relevant intra prediction apparatus of the present invention, be characterised in that described result is can be from the resulting intra-prediction direction of coded sequence coded image formerly, described candidate device for limiting can limit the candidate of intra-prediction direction based on described intra-prediction direction.
Thus, be not subjected to the constraint of activity of imagination situation, can be accurately and from the known internal prediction direction, get rid of the low intra-prediction direction candidate of correlation effectively.
In addition, in intra prediction apparatus of the present invention, be characterised in that,, can use about the intra-prediction direction of the position identical with the macro block that comprises this space same position position on every side with the space of coded object macro block as described intra-prediction direction.
Thus, can improve precision, and can accurately and effectively get rid of the low intra-prediction direction candidate of correlation from this intra-prediction direction to the intra-prediction direction of coded object macro block.
In addition, in relevant intra prediction apparatus of the present invention, be characterised in that described result is the described coded sequence original image formerly or the adjacent pixels difference of coded image, described candidate device for limiting can limit intra-prediction direction candidate based on described adjacent pixels difference.
Thus, under the less situation of activity of imagination, can be accurately and from known pixel difference, get rid of the lower intra-prediction direction candidate of correlation effectively.
In intra prediction apparatus involved in the present invention, it is characterized in that can be according to the handling property of described intra prediction apparatus, and described candidate device for limiting is adjusted from the candidate of described intra-prediction direction and limited number.
Have again, the present invention not merely can realize as such intra prediction apparatus, the feature that this intra prediction apparatus possessed can also be realized as the intra-prediction method with step, these steps can also be realized as the program that can carry out in computer.Therefore, self-evident, this program can transmit by transmission media such as recording mediums such as CD-ROM and internets.And, can also realize as the picture coding device that possesses above-mentioned intra prediction apparatus.
As from foregoing description as can be seen, according to relevant intra prediction apparatus of the present invention, still can keep high image quality and high coding efficiency, and can alleviate the computing of intra-prediction.
Just, though intra-prediction is by form the processing of predicted picture from surrounding pixel copy pixel value, but in intra-prediction, because use a plurality of prediction direction to select high code efficiency, the calculating of the nonoptional prediction direction of result becomes tediously long.Therefore, owing to do not have help for code efficiency, so just reduce encoding calculation amount, it is effective omitting the intra-prediction that code efficiency is not too created a difference.In addition, tediously long in order to reduce this in the field picture of interlace mode, by not using the prediction mode that on code efficiency, does not create a difference in advance, can alleviate the load of relevant intra-prediction.In addition, by using the characteristics of image, handle thereby can reduce corresponding to the intra-prediction of image, and compare with existing method, treatment effeciency is higher.
Therefore, at digital camera with have today that the mobile phone etc. of camera is extensively popularized, practical value of the present invention is high.
Description of drawings
Fig. 1 is the figure that expression is included in the relation between each pieces of the macro block of 16 * 16 pixels among the picture I and 4 * 4 pixels.
Fig. 2 is the figure of expression 4 * 4 intra-prediction directions.
Fig. 3 is the figure of expression 16 * 16 intra-prediction directions.
Fig. 4 is the precedence diagram of the prediction processing of the existing intra prediction apparatus execution of expression.
Fig. 5 is the integrally-built functional-block diagram of picture coding device 1 that expression is applicable to the intra prediction apparatus of the relevant embodiment of the invention.
Fig. 6 is the block diagram of the functional structure of the expression intra prediction apparatus 11 that uses image feature amount.
Fig. 7 is the precedence diagram of the detailed process carried out of the each several part of expression intra prediction apparatus 11.
Fig. 8 is the block diagram of the functional structure of the expression intra prediction apparatus 11 that uses picture structure situation.
Fig. 9 is the block diagram of the functional structure of the expression intra prediction apparatus 11 that uses the aspect ratio situation.
Figure 10 is the figure of expression about the angle deviating of 4 * 4 intra-predictions between original image and field.
Figure 11 is the figure of expression about the distance relation between the location of pixels of 16 * 16 intra-predictions location of pixels on the scene and original image.
Figure 12 is the block diagram of the functional structure of the expression intra prediction apparatus 11 that uses dynamic vector, predictive mode and pixel computing information.
Figure 13 is used to illustrate the figure that carries out the decision of prediction direction candidate by dynamic vector.Particularly, Figure 13 (a) is the figure of expression according to the original image of coded sequence arrangement, the figure of Figure 13 (b) coded image that to be expression arrange according to coded sequence, Figure 13 (c) are the presentation code order coded image formerly and the figure of the relation between the image of coded object.
Figure 14 is used to illustrate the figure that carries out the decision of prediction direction candidate by predictive mode.Particularly, Figure 14 (a) is the figure of expression according to the original image of coded sequence arrangement, the figure of Figure 14 (b) coded image that to be expression arrange according to coded sequence, Figure 14 (c) be the presentation code order formerly coded image and the figure of the relation between the coded object image.
Figure 15 is that the expression candidate limits the flow chart that operation is handled in the intra-prediction candidate qualification of using known results, intra-prediction to limit the intra-prediction candidate in unit 111.
Embodiment
Below, be illustrated with reference to the intra prediction apparatus of accompanying drawing the relevant embodiment of the invention.
Fig. 5 is the integrally-built functional-block diagram of code device 1 that expression is applicable to the intra prediction apparatus of the relevant embodiment of the invention.
Will be by the picture of external encode, the picture that becomes this coded object is divided into the piece (macro block) of for example level 16 * vertical 16 pixels that are called macro block, and is that following processing is carried out in the unit with the piece.
For picture,, can be transformed into difference image by in subtracter 12, obtaining as the difference between the prediction image signal of the output of dynamic compensation unit 177 as coded object.Difference image is outputed to converter unit 14 by mode selector switch 13.
By converter unit 14 difference image is become frequency axis from time axis conversion, and further carry out by quantifying unit 15 and to quantize, generate the residual signals that constitute by conversion coefficient.
This residual signals by outside predicting unit 17 by local decode.That is, residual signals in inverse quantization unit 171 by re-quantization.Thereby inverse transformation block 172 is handled by carrying out picture decodings such as frequency inverse conversion, generates the residual error decoding signal.Adder 173 generates the reconstructed image signal by addition residual error decoding signal and prediction image signal.Resulting reconstructed image signal is stored in the frame memory 175 after removing the piece distortion by loop filter 174.
On the other hand, the received image signal of the macro block unit of reading from frame memory 175 is imported into dynamic prediction unit 176.At this, the picture that finishes with one or more codings that are stored in the frame memory 175 serves as to explore object, determine the dynamic vector of this position of indication and with reference to picture indices, selected picture at this moment indicated in this index by detecting near the image-region of received image signal.The detection of dynamic vector is to carry out with the unit that further is divided into macro block.Dynamic prediction unit 176 uses resulting dynamic vector and with reference to picture indices, takes out only image-region in the picture that coding finishes from be stored in frame memory 175, and the generation forecast image.
For the dynamic vector of exporting by above-mentioned a succession of processing, with reference to coded messages such as picture indices, residual coding signals,, can pass through the less bit stream of this encoding process output data quantity by in entropy coding unit 16, implementing Variable Length Code.
Though more than the flow process of Chu Liing is in the operation of carrying out under the inter-picture prediction coding situation, also can switch to the intra-frame prediction coding by switch 114 and switch 115.
The situation of carrying out in-line coding is not by dynamic compensation generation forecast image, and in intra prediction apparatus 11, the zone that finishes according to encoding in the same picture generates the predicted picture in coded object zone, and generates difference image signal by getting difference.In addition, in the back this is described in detail.Identical with the situation of external encode, this difference image signal is transformed into the residual coding signal in converter unit 14 and quantifying unit 15, and implements Variable Length Code in entropy coding unit 16, thus the less bit stream of output data quantity.
Below, the detailed structure of intra prediction apparatus 11 shown in Figure 5 is described.
Fig. 6 is the block diagram of the functional structure of the expression intra prediction apparatus 11 that uses image feature amount.In addition, also shown the image feature amount input unit 181 that comprises the control unit 18 of encoding in the figure.
The image feature amount input unit 181 of coding control unit 18 is obtained and is added the inside and outside information of video flowing and the image input information that machine had to as image feature amount, and to the obtained image feature amount of intra prediction apparatus 11 outputs.
The candidate that intra prediction apparatus 11 has an intra-prediction direction candidate of each piece that is used for limiting a plurality of pixels that are applicable to composing images from merge to this characteristics of image a plurality of limits unit 111 and carries out the intra-prediction performance element 112 of intra-prediction to limit intra-prediction direction that unit 111 limited by candidate.In addition, intra-prediction performance element 112 has the difference value that is used for calculating about the reference pixels of each predictive mode and coded object pixel, the predicated error computing unit that calculates the absolute value difference value, converter unit with converter unit 14 identical functions, quantifying unit with quantifying unit 15 identical functions, inverse quantization unit with inverse quantization unit 171 identical functions, the inverse prediction unit of the pixel value that restores restored image with the inverse transformation block of inverse transformation block 172 identical functions with from the pixel value and the difference value of reference pixels.
Then, 112 pairs of intra-prediction directions that limited by candidate qualification unit 111 of intra-prediction performance element are carried out intra-prediction.Just, calculate predicated error, and use minimum predicated error as intra-prediction.
In intra-prediction, between the precision of prediction of the characteristic quantity of image and intra-prediction direction, there is correlation.
Prediction direction by using the high precision of prediction of releasing from the image feature amount class is as the prediction direction candidate, the prediction direction that low prediction direction of precision of prediction and precision of prediction do not become other can be preferentially omitted, and the load that intra-prediction is handled can be alleviated.Image feature amount described herein comprises by image and pixel being calculated image input other external factor such as characteristic that machine had such as the characteristic quantity of trying to achieve and imaging apparatus.
For example, during photography, use the phtographic lens that camera is rotated in the horizontal direction.This phtographic lens can detect by the gyrosensor that is arranged in the camera for example.In addition, the front and back dynamic vector according to this image also can detect phtographic lens.In case take out 1 frame of the other image of this phtographic lens, just form the very strong frame of correlation between pixel in a lateral direction.According to the correlation between this pixel, can estimate the precision of prediction of intra-prediction direction, and can deduct the low intra-prediction direction candidate of precision of prediction in advance.
In addition, set under the situation of encoding at machine with low bit rate, under the situation of encoding with low resolution, with under the situation of using close for example predictive mode 0 (level) of prediction direction and predictive mode 6 (level-following), the predicated error of two kinds of patterns does not have difference, and coding efficiency does not have difference yet.At this, preferentially predict predictive mode 0 (level) that the direction of candidate prediction direction differs widely etc.Just, preferentially delete predictive mode 6.
In addition, can determine prediction direction according to dynamic vector.Just, when carrying out intra-prediction, the dynamic vector that uses past or future frame is as image feature amount.On this dynamic vector direction, exist the possibility of high correlation pixel value very big.Thereby, can omit the intra-prediction direction that departs from this dynamic vector direction greatly.At this, as past or future frame dynamic vector, promptly can be the dynamic vector of picture integral body, also can be the dynamic vector of specific region in the picture.
In addition, can from the intra-prediction direction candidate of coding MB, omission depart from the intra-prediction direction of coding MB greatly in abutting connection with near the dynamic vector direction MB.
And, the coding MB in, when obtaining dynamic vector, if with this dynamic vector as characteristic quantity, can further select high-precision intra-prediction direction candidate so.
In H.264, picture I is only carried out intra-prediction, P or B picture are implemented intra-prediction/two kinds of predictions of outside prediction, thereby carry out coding with the few coding mode of residual signals.Therefore, can in whole pictures, implement intra-prediction.
Owing to used these, so limited candidate to coded object picture prediction direction.Just, candidate limits unit 111 based on from coded sequence original image or the result that obtains of coded image formerly, can limit intra-prediction direction candidate.In view of the above, also can easily limit intra-prediction direction candidate.
Specifically, at first, in memory, write down the prediction direction of the picture intra-prediction of at first encoding and the MB position in the picture in advance.Then, the intra-prediction of the MB position identical with the encoding process picture is carried out with prediction direction in service recorder MB position in the picture of described memory.For example, under the whole motionless situation of picture, the prediction direction of the intra-prediction of relative tertiary location MB, the continuous picture of DISPLAY ORDER is very high in unidirectional possibility.For example, under the situation of encoding with DISPLAY ORDER I, B1, B2, P... structure, the conduct of the prediction direction of certain MB is very high with the possibility of the same position of the coding result of the MB of picture I or picture P same position in the B1 picture.Therefore, will be as the prediction direction of the coding result of picture I coding result and picture P intra-prediction direction candidate as picture B1.Equally, picture B2 with the intra-prediction direction of picture B1 and picture P as candidate.Under the situation of selecting the common outside prediction of picture B1 and picture P, the prediction candidate of picture B2 is changed to 0, and can only carries out outside prediction.
At this,, also the prediction direction in abutting connection with MB can be included in the candidate though mention the MB of same position in the picture.Just, in above-mentioned example, as the prediction candidate of picture B2, by adding picture B1 or picture P same position MB to, can be with up and down MB prediction direction as candidate.
Fig. 7 is the precedence diagram of the detailed process carried out of each unit of expression intra prediction apparatus 11.
In case input picture I, candidate limits unit 111 at first according to the candidate that limits the intra-prediction direction from the image feature amount of image feature amount input unit 181.This qualification can be applicable to piece and macro block any one or both.
Then, intra-prediction performance element 112 is for limit the intra-prediction direction execution intra-prediction that unit 111 is limited by candidate.More particularly, to being that predictive mode that piece 0 limits calculates predicated error (absolute value difference and).Just, only to the predictive mode that limited calculate difference value between the pixel of reference pixels and coded object and absolute value difference and.Thereby, intra-prediction performance element 112 use the predicated error minimums as intra-prediction.Just, under the situation of the absolute value difference and the predictive mode 0 of minimum, the difference value of the reference pixels by the relevant piece 0 of conversion, quantification, re-quantization, inverse transformation, inverse prediction and predictive mode 1 and the pixel of coded object, the pixel value that restores the restored image of piece 0 according to the pixel value and the difference value of reference pixels.
In case restore the pixel value of the restored image of piece 0, intra-prediction performance element 112 just repeats processing same as described above, thereby restores the pixel value of the restored image of piece 1～piece 15.
In case restore the restored image of piece 15, just to this macro block, only with the predictive mode of introducing calculate the difference value of reference pixels and coded object pixel and absolute value difference and.Thereby intra-prediction performance element 112 uses predicated error minimums, just, for example use each piece the absolute value difference and the sum and the less absolute value difference of macro block and as intra-prediction.That is, the absolute value difference of each piece and total less situation under, the difference value of relevant each piece of intra-prediction performance element 112 outputs.In contrast, under the absolute value difference of macro block and less situation, the difference value of the relevant macro block of intra-prediction performance element 112 outputs.
Thereby, when limiting predictive mode, can alleviate the load of intra-prediction performance element 112 significantly, and can improve the calculated performance of intra-prediction.
In addition, this intra prediction apparatus 11 is not only hardware configuration, can also realize by means such as CPU, memory, programs.
Below, explanation is by merging the situation that image feature amount limits candidate successively.
At first, be that the situation of pixel aspect ratio describes to image feature amount.
Fig. 8 is that the block diagram of pixel aspect ratio as the functional structure of the intra prediction apparatus 11 of image feature amount used in expression.In addition, in the figure, also shown the pixel aspect ratio detecting unit 183 that the image feature amount input unit 181 that merged coding control unit 18 is possessed.In addition, for giving identical sequence number, and omit its detailed description with the corresponding structure division of the situation of Fig. 6.
In field structure, can use image every a pixel recording level pixel.Thus, change on the direction of direction on the field and original image.Equally, in case make expression between adjacent pixels level and the pixel aspect ratio of vertical range ratio change, change on the image direction of original image direction and pixel aspect ratio so.Pixel aspect ratio detecting unit 183 detects this variation.Corresponding to passing through the variation of this pixel aspect ratio on the original image direction, candidate limits unit 111 can limit appropriate prediction direction candidate, thereby can improve the calculated performance of intra-prediction.
The object lesson that changes under the pixel aspect ratio situation is described below.Because the image of half D1 pixel is in the horizontal direction keeping at interval, so change in direction on the half D1 and the direction on the original image.Therefore, exist, do not have the prediction direction that helps for code efficiency as the field structure situation.Specifically, be predictive mode 6 and predictive mode 8 shown in Figure 2.In a single day these return on the direction of original image, the horizontal direction of just close predictive mode 0, and on code efficiency, can not create a difference.Thereby,, can alleviate computing by omitting this prediction direction.In addition, can on corresponding to the prediction direction of pixel aspect ratio, revise the prediction direction of intra-prediction, thereby can also improve the performance on all prediction direction.
In addition, this intra prediction apparatus 11 is not only to be made of hardware, can also realize by means such as CPU, memory, programs.
In addition, in intra prediction apparatus 11,,, can use level, vertical range on the original image as limiting appropriate prediction direction candidate method corresponding to pixel aspect ratio.
With the inverse of each distance confidence level as prediction.For example, in field structure, the distance on the original image is changed to horizontal range " 1 ", and vertical range is changed to 2 times of horizontal range, is " 2 ".So, confidence level is " 1 " and " 1/2 ".
Since this situation, vertical direction determine than horizontal direction determine greatlyyer, therefore predict the outcome along this tendency.Thereby, as the candidate of prediction direction, the preferential candidate that adopts near horizontal direction.Just, by the direction of preferential deletion vertical direction and approximate this direction, thereby can lighten the load.
In addition, putting down in writing and be not only device at this, can also be to realize by means such as programs.
In addition, for pixel aspect ratio information, can obtain, and use this information and executing intra-prediction from photography machine, video recording machine.
For example, not under the foursquare situation at the imaging apparatus of photography machine, on vertical range on the original image and horizontal range, can produce difference.In addition, by changing the picture aspect ratio in video recording machine etc., under situation about writing down, on the vertical range of original image and horizontal range, also produce difference.
In addition, as from obtaining information etc. the VUI parameter aspect ratio idc H.264, some coded system is carried out intra-prediction by the information of adding to inside and outside the video flowing.
In addition, putting down in writing at this not merely is device, can also realize by means such as programs.
Below, be that the situation that picture is constructed describes to image feature amount.
Fig. 9 is that the block diagram of picture structure as the functional structure of the intra prediction apparatus 11 of image feature amount used in expression.Wherein, also illustrate the picture structure identifying unit 182 that the image feature amount input unit 181 of coding control unit 18 is possessed in the figure.In addition, for giving identical sequence number, and omit its detailed description with the corresponding component part of Fig. 6 situation.
The field picture of interlace mode is by the pixel separation of an original image constitutes by keeping at interval in vertical direction.Therefore, do not change though the continuity of horizontal direction pixel is compared with the two field picture of progressive scan mode, the continuity of vertical direction pixel is lower than two field picture.This successional height is judged by picture structure identifying unit 182.
By using this characteristic, to compare with the prediction of vertical direction, candidate limits the prediction of unit 111 easier selection horizontal directions.Just, the preferential prediction (4 * 4 predictive modes 0 and 16 * 16 predictive modes 0) of getting rid of vertical direction from candidate.
Wherein, what put down in writing at this not merely is device, can also realize by means such as programs.
In addition, in interlace mode,, so just as shown in Figure 10, can not produce difference in prediction mode in case 4 * 4 intra-prediction directions are converted into direction on the original image.
In certain field picture of interlace mode, introduce the straight line of 8 directions as shown in figure 10.
The field picture of interlace mode like that, is that per 1 row keeps the image of the structure of pixel separation shown in Figure 10 (a), and in vertical direction will be apart from the state that is compressed into 1/2.On the contrary, shown in Figure 10 (b) like that, in case place it in again on the location of pixels on the original image, vertical range just becomes 2 times that do not elongate horizontal range at interval.Therefore, on original image, the straight line angle of 8 directions changes respectively.
It should be noted the direction of predictive mode 5 (vertical-right side), predictive mode 7 (vertical-left side) especially.These directions are in close proximity to predictive mode 0 direction of (vertically).
Therefore, in 4 * 4 intra-predictions, the pixel value of predicting on the direction of predictive mode 5 (vertical-right side), predictive mode 7 (vertical-left side), predictive mode 0 (vertically) is very approximate, thereby not too can produce difference in the predicated error of conduct and the difference of original image.Equally, on the direction for predictive mode 3 (diagonal angle-following-left side), predictive mode 4 (diagonal angle-following-right side), same tendency can appear.
Use this specific character, if the candidate of restriction prediction in advance can not reduce image quality and can simplify the intra-prediction processing.
Under this situation, in picture structure identifying unit 182, be the field picture of interlace mode by judging that picture is constructed, or the two field picture of progressive scan mode, to intra prediction apparatus 11 output judged results.
If field picture, the candidate of intra prediction apparatus 11 limits unit 111 and just the field is sent to intra-prediction performance element 112 with intra-prediction candidate example, and described is to omit the field intra-prediction candidate example of several as shown in Figure 9 prediction candidates with intra-prediction candidate example.Intra-prediction performance element 112 is handled by the intra-prediction direction candidate that is limited being carried out prediction and calculation, determines prediction direction.
In addition, what put down in writing at this not merely is device, can also realize by means such as programs.
And then, generally, to compare with the distance of leaving in abutting connection with MB using under the situation about predicting in abutting connection with the pixel of MB, the correlation between pixel becomes lower.
Predicated error became big possibility when therefore, the distance between pixel was elongated on the original image increases.
Exist between horizontal range and the vertical range under the situation of difference, between predicated error, also have difference about the predictive modes 0 (vertically) of inner 16 * 16 predictions and the prediction direction by predictive mode 1 (level).
Be configured under the interleaved situation at picture, as shown in Figure 11, the vertical range of the pixel separation on the original image becomes the twice of horizontal range, the pixel interdependence step-down of vertical direction, and it is big that predicated error becomes.
In the field picture of interlace mode, can preferentially omit predictive mode 0 (vertical) prediction relevant with 16 * 16 intra-predictions.
Equally, in the prediction of the predictive mode 2 (on average) of the consensus forecast of the lower end pixel value of the MB on the top of the right-hand member pixel value of the right side MB by adjacency and adjacency, thereby the pixel that vertical correlation is low is used for predict pixel calculates the predicated error change greatly, can preferentially omit the predictive mode 2 (on average) of relevant 16 * 16 intra-predictions.
In addition, what put down in writing at this not merely is device, can also realize by means such as programs.
In addition, the image recording mode is that interlace mode still is that the definite of progressive scan mode can expect following situation.Below, by specify interlace mode, when progressive scan mode writes down, recording mode and recovery time are known as playback system.
Existence is by the situation of user's selection and situation about determining by the specifications parameter of photography machine, video recording machine, display device etc.
For example, consider situation about selecting by the user, under the situation of photography machine corresponding to interlace mode, progressive scan mode dual mode, reproducing environment such as the display device of user by merging self configuration, transcriber are selected recording mode.If interlace mode is selected interlace mode during so by coding in as the video tape recorder of photography machine, just can omit the intra-prediction direction that does not have help for code efficiency as the television set of this display device.
For example, consider situation about determining, if photography machine only corresponding to interlace mode, by omitting the intra-prediction direction when photographing with interlace mode, just can improve code efficiency so by the specifications parameter of photography machine.
In addition, consideration is by the specifications parameter situation about determining of video recording machine, when encoding in recording apparatus etc. from other image input machine, if judge the interlace mode that is input as of image machine, by omitting the intra-prediction direction, just can improve code efficiency so.
Regarding to the input from other image input machine described herein down replenishes.
Under the situation of using other coded system to encode, can judge whether it is interlace mode with rule based on this coded system.Just, can carry out this judgement according to header information etc.
And, consider situation about determining with the specifications parameter of display device, by merging the playback system of the display device that connects the video recording machine, and record a video with interlace mode the time omit intra-prediction, can improve code efficiency.
In addition, what put down in writing at this not merely is device, can also realize by means such as programs.
In addition, what is called H.264 intra-prediction picture level self adaptation is meant for each picture, by intra-prediction result and relevant intra-prediction result who constructs of more relevant frame structure, with the side of coding efficiency the best as the mode that predicts the outcome.When predicting, use the candidate that in the picture structure, limits the prediction direction candidate to limit unit 111 as its structure.
When coding, use the picture level self adaptation owing to known picture structure judging unit 182, so under the situation of this mode of use, encoding with the field structure, promptly, when encoding with interlace mode, candidate limits the candidate that unit 111 can reduce prediction direction.
In addition, what is called H.264 intra-prediction macro-block-level self-adaptive is meant with MB to be unit, by intra-prediction result and relevant intra-prediction result who constructs of more relevant frame structure, with the side of coding efficiency the best as the mode that predicts the outcome.When prediction is constructed as the field, use the candidate qualification unit 111 that in the picture structure, limits the prediction direction candidate.When coding, use macro-block-level self-adaptive owing to known picture structure judging unit 182, so under the situation of this mode of use, encoding with the field structure, when promptly encoding with interlace mode, candidate limits the candidate that unit 111 can reduce prediction direction.
In addition, what put down in writing at this not merely is device, can also realize by means such as programs.
Below, for image feature amount for according to coded sequence formerly original image or the result's that obtains of coded image situation describe.
Figure 12 is that dynamic vector, predictive mode and the pixel computing information block diagram as the functional structure of the intra prediction apparatus 11 of The above results is used in expression.In addition, in the figure, show image feature amount input unit 181 the dynamic vector input unit 184, predictive mode input unit 185, the pixel computing information input unit 186 that are possessed of coding control unit 18 in the lump.In addition, for giving identical sequence number, and omit its detailed description with the corresponding component part of Fig. 6 situation.
As mentioned above, H.264 picture I is only carried out intra-prediction, and implement intra-prediction/outside prediction dual mode prediction, and encode with the few coding mode of residual signals for picture P or B.
Therefore, for coded sequence original image or coded image formerly, results such as adjacent pixels difference and intra-prediction direction are known.In addition, be that the dynamic vector of each macro block is known under the situation of picture P and picture B at coded sequence coded image formerly.And according to the characteristic of image, coded sequence original image or the high situation of the correlation between coded image and the coded object image formerly is a lot.
Thereby, even by using for coded sequence original image or the result that obtains of coded image formerly, that is to say, even use known dynamic vector, intra-prediction and and the adjacent pixels difference limit the candidate of intra-prediction direction, the also processing that can omit the bad processing of code efficiency in advance and on code efficiency, not create a difference.
Therefore, in this embodiment, as shown in Figure 12, in image feature amount input unit 181, can be provided with and be used for respectively importing as to coded sequence original image formerly or the result's that obtains of coded image dynamic vector, the direction of predictive mode and dynamic vector input unit 184, predictive mode input unit 185 and the pixel computing information input unit 186 of adjacent pixels difference (being also referred to as the pixel computing information).Therefore, image feature amount input unit 181 can limit unit 111 and constitutes by will optionally outputing to candidate from dynamic vector, predictive mode direction and the adjacent pixels difference of dynamic vectorial input unit 184, predictive mode input unit 185 and pixel computing information input unit 186.
Below, for relevant situation from dynamic vector input unit 184 output dynamic vectors, the decision of carrying out the prediction direction candidate by dynamic vector describes.
Figure 13 is used for describing the figure that carries out the decision of prediction direction candidate by dynamic vector.Especially, Figure 13 (a) is the figure of expression according to the original image of coded sequence arrangement, the figure of Figure 13 (b) coded image that to be expression arrange according to coded sequence, Figure 13 (c) be the presentation code order formerly coded image and the figure of the relation between the coded object image.
At this, the previous coded image that illustrates use coded object image is as coded sequence coded image formerly.This is because the correlation between original image formerly or coded image and the coded object image uprises, and can accurately limit intra-prediction direction candidate.
Therefore, this coded image is such as shown, and MB1～MB9 constitutes by macro block, and is that MV1～MV9 is described with the dynamic vector of each macro block MB1～MB9.In addition, be that the α shown in the figure is that example is described with the coded object macro block.
Macro block α is being carried out under the situation of intra-prediction, it is unit area with the identical macro block MB9 in the locus of previous coded image that candidate limits unit 111, with reference to the dynamic vector MV9 of this unit area, and, limit intra-prediction direction candidate based on the direction of this dynamic vector MV9.
Specifically, the composition of dynamic vector MV9 horizontal direction is many, and the composition of vertical direction is few.That is, the horizontal direction composition on the dynamic vector MV9 direction is main, and and coded object macro block α between the correlation of horizontal direction higher.Therefore, candidate limits the prediction direction eliminating of unit 111 vertical direction outside candidate.Just, candidate limits unit 111 and omit 0,5,7 patterns from dynamic vector M V9.
Thereby, exist at image under the situation of animation, precision can be improved, and the low intra-prediction direction candidate of correlation can be from known dynamic vector, got rid of accurately and efficiently the dynamic vector of coded object macro block.
In addition, will comprise this macro block MB9 around, just the zone of macro block MB5, MB6, MB8 based on the dynamic vector direction of this unit area, can be determined the candidate of intra-prediction direction as the unit area.That is,, also can limit the candidate of intra-prediction direction based on the direction of the dynamic vector that synthesizes dynamic vector MV5, MV6, MV8, MV9.Even if in the case, because the direction of synthetic dynamic vector is by resolving into horizontal direction respectively with dynamic vector MV5, MV6, MV8, MV9 and the vertical direction addition calculation obtains, so the horizontal direction composition is main.Therefore, candidate qualification unit 111 can be got rid of the prediction direction of vertical direction outside candidate.Just, candidate limits unit 111 and omitted 0,5,7 patterns from dynamic vector M V5, MV6, MV8, MV9.
In addition, which side the dynamic vector of the previous coded image integral body of reference also can determine the intra-prediction candidate towards.That is, macro block MB1～MB9 integral body as the unit area, based on the dynamic vector direction of this unit area, also can be determined the intra-prediction direction.
Below, from predictive mode input unit 185 prediction of output pattern situations, determine that by predictive mode the prediction direction candidate is described for relevant.
Figure 14 is used to describe the figure that determines the prediction direction candidate by predictive mode.Especially Figure 14 (a) is the original image that expression is arranged according to coded sequence, and Figure 14 (b) is the coded image that expression is arranged according to coded sequence, Figure 14 (c) be the presentation code order formerly coded image and the figure of the relation between the coded object image.And this coded image is such as shown in the figure, is described to be made of macro block MB1～MB9.In addition, be that α is described shown in the figure with the coded object macro block.
At this, be in the situation of picture I at coded image, for the macro block that in intra-prediction, adopts, kept the result of the predictive mode that limits.Thereby, in this case, can use the direction of the predictive mode that is limited.Relative therewith, be under the situation of picture P or B at coded image, result, predictive mode during intra-prediction go out of use usually.But in the present embodiment, the result during intra-prediction, predictive mode are described temporarily to be retained in the result who constitutes like that in the memory.
Figure 15 is that the expression candidate limits the flow chart that operation is handled in the intra-prediction candidate qualification of using known results, intra-prediction to limit the intra-prediction candidate in unit 111.
Macro block α is being carried out under the situation of intra-prediction, candidate limit unit 111 at first judge coded sequence formerly whether be picture I (S11) with reference to coded image.In addition, can use the previous coded image of coded object image as coded sequence coded image formerly.This is because the correlation between the image of original image formerly or coded image and coded object uprises, and can accurately limit intra-prediction direction candidate.
In judged result is under the situation of picture I (being) among the S11, and candidate limits unit 111 and uses predicting the outcome of picture I, limits intra-prediction candidate (S12), and finishes the intra-prediction candidate and limit and handle.Promptly, candidate limits the unit 111 macro block MB9 that the locus of previous coded image is identical as unit area, direction with reference to the intra-prediction mode of this unit area, to the macro block that in this intra-prediction, adopts, based on the aspect of the predictive mode direction that is limited, limit the candidate of intra-prediction direction.Specifically, if the direction of the predictive mode that is limited for example for horizontal direction, the intra-prediction direction of coded object macro block α is that the probability of horizontal direction just uprises so.Therefore, candidate qualification unit 111 is got rid of the prediction direction of vertical direction outside candidate.
Thereby, even in image, exist aspect other of situation of animation, in the less situation of image animation, can improve precision, and can from the direction of known predictive mode, get rid of the lower intra-prediction direction candidate of correlation accurately and efficiently the prediction direction of coded object macro block.
In addition, by comprising corresponding to around the macro block MB9 of this coded object macro block α, that is, the zone of macro block MB5, MB6, MB8 based on the predictive mode direction of this unit area, also can be determined the candidate of intra-prediction direction as unit area.
Relative therewith, under the situation that is not picture I (among the S11 not), candidate limits unit 111 and uses predicting the outcome under the in-line coding situations to limit intra-prediction candidate (S13), and finishes the intra-prediction candidate and introduce and handle.
Thereby,,, can both accurately from known intra-prediction direction, get rid of the lower intra-prediction direction candidate of correlation easily effectively no matter how image moves even be not under the situation of picture I at coded sequence coded image formerly.
Below, just relevant to pixel computing information input unit 186 output adjacent pixels difference, i.e. the situation of pixel computing information is to determining that by the pixel computing information prediction direction candidate is illustrated.
Here, so-called pixel computing information mean the coded sequence original image pixels formerly that is included in the characteristics of image in difference and the coded image adjacent pixels difference any one of them.It is known that this pixel computing information is that calculated in advance finishes.Thereby, by temporarily this result being remained in advance in the memory so that can re-use or calculate again, thereby can alleviate the load that candidate limits unit 111.In addition, at this, the result during with intra-prediction, pixel computing information temporarily are retained in structure such in the memory and are described.
And, it is unit area with the identical macro block in the locus of previous original image or coded image that candidate limits unit 111, pixel computing information with reference to this unit area, based on the pixel computing information of the macro block that in this intra-prediction, is adopted, to the macro block α qualification intra-prediction direction candidate of coded object image.Specifically, the ratio according between the adjacent pixels difference of unit area horizontal direction and the vertical composition adjacent pixels difference limits the intra-prediction candidate.Thus, can know which correlation height of horizontal direction and vertical direction, that is, and the direction that correlation is high.Thereby, under the less situation of the amount of movement of image, can from the known pixels computing information, get rid of the low intra-prediction direction candidate of correlation accurately and efficiently.
In the above-described embodiments, the candidate limits the different essential factor of feature of unit foundation and view data, adjusts in the prediction direction candidate internally and limits number.For example, according to the handling property of intra prediction apparatus, adjust in the prediction direction candidate internally and limit number.
In addition, what put down in writing at this not merely is device, can also realize by means such as programs.
In addition, though be that the situation of animation is described for image in the above-described embodiments, but the object of intra-prediction can be picture I also, also can be suitable for according to intra-prediction of the present invention rest images such as JPEG, and further compress coding data.
If use according to intra prediction apparatus of the present invention, image encoding H.264 can be realized with calculated load still less, and the pocket telephone that except personal computer and HDD video tape recorder, DVD recorder etc., has video camera, camera can be applicable to.In addition, can also be applicable to the code device that possesses this intra prediction apparatus.
Claims (24)
1, a kind of intra prediction apparatus is characterized in that, comprising:
Be used for by the feature that adapts to view data from a plurality of intra-prediction directions, limits a plurality of block of pixels that are applicable to this view data of formation intra-prediction direction candidate the candidate device for limiting and
The intra-prediction direction that use is limited by described candidate device for limiting is carried out the intra-prediction final controlling element of intra-prediction.
2, the intra prediction apparatus of putting down in writing according to claim 1 is characterized in that, described candidate device for limiting limits intra-prediction direction candidate according to the pixel aspect ratio as described view data feature.
3, the intra prediction apparatus of putting down in writing according to claim 2 is characterized in that, described aspect ratio is from picture signal input machine with from any one acquisition the resulting information inside and outside the video flowing.
4, the intra prediction apparatus of putting down in writing according to claim 2, it is characterized in that, described candidate device for limiting limits intra-prediction direction candidate by using according to the level between the adjacent pixels of described pixel aspect ratio in original image and the vertical range confidence level as the prediction of the horizontal direction of intra-prediction and vertical direction.
5, according to the intra prediction apparatus of claim 1 record, it is characterized in that, described candidate device for limiting by demonstration be interlacing scan and line by line scan in any, according to picture tectonic information as described characteristics of image, qualification intra-prediction direction candidate.
6, the intra prediction apparatus of putting down in writing according to claim 5 is characterized in that, described picture tectonic information is from picture signal input machine with from any one acquisition the resultant information inside and outside the video flowing.
7, the intra prediction apparatus of putting down in writing according to claim 5, it is characterized in that, show under the interleaved situation at described picture tectonic information, described candidate device for limiting from candidate preferential get rid of vertical-right of being included in the described intra-prediction direction and vertical-left to.
8, the intra prediction apparatus of putting down in writing according to claim 5, it is characterized in that, show under the interleaved situation at described picture tectonic information, described candidate device for limiting preferentially from candidate, get rid of the vertical-right be included in described intra-prediction direction, vertical-left to, diagonal angle-down-right and diagonal angle-down-left to.
9, the intra prediction apparatus of putting down in writing according to claim 5 is characterized in that, shows under the interleaved situation at described picture tectonic information, and described candidate device for limiting is preferentially got rid of the mean direction that is included in the described intra-prediction direction from candidate.
10, the intra prediction apparatus of putting down in writing according to claim 5, it is characterized in that, show under the interleaved situation that at described picture tectonic information described candidate device for limiting is preferentially got rid of mean direction and the vertical direction that is included in the described intra-prediction direction from candidate.
11, the intra prediction apparatus of putting down in writing according to claim 5 is characterized in that, when encoding by the picture level self adaptation of relevant animation compress mode, described candidate device for limiting limits intra-prediction direction candidate according to the picture tectonic information.
12, the intra prediction apparatus of putting down in writing according to claim 5, it is characterized in that, described picture tectonic information is any one in a structure and the frame structure, when encoding by the macro-block-level self-adaptive of relevant animation compress mode, by switch a constructional a pair of macro block to the constructional a pair of macro block of frame to and when predicting, described candidate device for limiting according to this macro block to being that a structure or the information of frame structure limit the intra-prediction candidate.
13, the intra prediction apparatus of putting down in writing according to claim 1 is characterized in that, described candidate device for limiting is based on limiting intra-prediction direction candidate according to coded sequence original image or the result that obtains of coded image formerly.
14, the intra prediction apparatus of putting down in writing according to claim 13 is characterized in that, can use previous original image of coded object image or coded image as described coded sequence original image or coded image formerly.
15, the intra prediction apparatus of putting down in writing according to claim 13, it is characterized in that, described result is from the resulting dynamic vector of coded sequence coded image formerly, and described candidate device for limiting limits intra-prediction direction candidate based on the direction of described dynamic vector.
16, the intra prediction apparatus of putting down in writing according to claim 15, it is characterized in that, as described dynamic vector, can use position, comprise the position around this space same position and the dynamic vector in any one unit field in the integral image for expression and the macro block same space of coded object.
17, the intra prediction apparatus of putting down in writing according to claim 13, it is characterized in that, described result is from the resulting intra-prediction direction of coded sequence coded image formerly, and described candidate device for limiting limits intra-prediction direction candidate based on described intra-prediction direction.
18, the intra prediction apparatus of putting down in writing according to claim 17, it is characterized in that, as described intra-prediction direction, can use for the position of the macro block same space of coded object with comprise the intra-prediction direction of the macro block of the position around this space same position.
19, the intra prediction apparatus of putting down in writing according to claim 13, it is characterized in that, described result is the described coded sequence original image formerly or the adjacent pixels difference of coded image, and described candidate device for limiting limits intra-prediction direction candidate based on described adjacent pixels difference.
20, the intra prediction apparatus of putting down in writing according to claim 1 is characterized in that, according to the handling property of described intra prediction apparatus, described candidate device for limiting is adjusted from the candidate of described intra-prediction direction and limited number.
21, a kind of intra-prediction method is characterized in that, comprises:
By the feature that adapts to view data from a plurality of intra-prediction directions, limits the intra-prediction direction candidate that is applicable to a plurality of block of pixels that constitute this view data candidate qualification step and
The intra-prediction execution in step of intra-prediction is carried out in use by the described candidate qualification intra-prediction direction candidate that step limited.
22, the intra prediction apparatus of putting down in writing according to claim 21 is characterized in that, according to the handling property of the intra prediction apparatus of carrying out described intra-prediction method, adjusts from described intra-prediction direction candidate and limits number.
23, a kind of computer program is characterized in that, it be used for computer carry out intra-prediction, be recorded in the computer program on the computer-readable medium, comprising:
In computer, carry out the computer executable program code that candidate limits step, described candidate limit step be by the feature that adapts to view data from a plurality of intra-prediction directions, limits a plurality of block of pixels that are applicable to this view data of formation intra-prediction direction candidate and
Carry out the computer executable program code of intra-prediction execution in step in computer, described intra-prediction execution in step is to limit the intra-prediction direction candidate that step limits by described candidate and carry out intra-prediction by using.
24, the computer program of putting down in writing according to claim 23 is characterized in that, according to the handling property of computer, adjusts from the candidate of described intra-prediction direction and limits number.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338366A (en) * | 2007-06-29 | 2013-10-02 | 夏普株式会社 | Image encoding device, image encoding method, image decoding device, image decoding method |
| CN102187668B (en) * | 2008-10-14 | 2013-10-30 | 法国电信公司 | Method and device for encoding image or image sequence and decoding method and device |
| TWI642298B (en) * | 2011-06-17 | 2018-11-21 | 日商Ｊｖｃ建伍股份有限公司 | Image decoding device, image decoding method, image decoding program |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338366A (en) * | 2007-06-29 | 2013-10-02 | 夏普株式会社 | Image encoding device, image encoding method, image decoding device, image decoding method |
| CN103338366B (en) * | 2007-06-29 | 2016-08-24 | 夏普株式会社 | Picture coding device, method for encoding images, image decoder, image decoding method |
| CN102187668B (en) * | 2008-10-14 | 2013-10-30 | 法国电信公司 | Method and device for encoding image or image sequence and decoding method and device |
| TWI642298B (en) * | 2011-06-17 | 2018-11-21 | 日商Ｊｖｃ建伍股份有限公司 | Image decoding device, image decoding method, image decoding program |
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