CN101090500A - Code-decode method and device for video fast forward - Google Patents
Code-decode method and device for video fast forward Download PDFInfo
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Abstract
This invention discloses a coding/decoding method and a device suitable for video speed, when a current image is a moving one and the time interval between it and the last key one meets a certain condition, the current image is coded to a key one to be decoded when the video speeds up so as to avoid plugging key images in static images frequently and increase the compression performance of video sequence and speed for searching for target video. This invention also discloses a video compression coding method and a device.
Description
Technical field
The present invention relates to technical field of video processing, refer to a kind of decoding method of video fast forward and method and apparatus of device and a kind of video compression coding of being applicable to especially.
Background technology
Video file is made up of the digital picture of ordering successively, and the digital picture in the video file is divided into moving image and rest image according to itself and the intensity of variation that the previous frame digital picture is compared.Digital picture in the video file, especially moving image because its data volume is very big, make video file be not easy to transmission and storage.Video compression technology mainly becomes the less relatively one dimension bit stream of data volume with the moving image pixel matrix compressed encoding of two dimension, with the DID amount that reduces to transmit or store, and then the purpose of the video file data volume that realizes reducing transmitting or store.
At present, existing video compression technology usually adopts based on the hybrid coding mode of the estimation of macro block and discrete cosine transform (DCT, Discrete Cosine Transform) conversion, quantification moving image is encoded.Video compression standard commonly used has: H.261 serial, H.263 series is H.264 serial, MPEG-2 series and MPEG-4 series.Coding to video sequence is meant, sequence of video images is become the process of high compression ratio bit stream according to video compression standard; Decoding to video sequence is meant, the high compression ratio bit stream is reverted to the process of sequence of video images according to video compression standard.
The process of estimation is the process of searching for the piece the most similar to the current block in the present frame in the former frame of present frame or former frame.When searching the piece the most similar to current block in preceding frame, with the piece that the searched reference block as current block, the frame at reference block place is a reference frame, and the distance between current block and the reference block is the motion vector (MV) of current block.Video compression encoder carries out dct transform, quantification, scan process with the difference between current block and the reference block, and difference and motion vector MV after will scanning then carry out variable-length encoding, forms code stream.
When being meant decoding, the F.F. of video uses than normal fireballing mode playing video file.F.F. is mainly used in the fast browsing video content, finds the starting point of target video at short notice.Because the picture number that the display device per second shows is fixed, generally be that per second shows that 25 two field pictures or per second show 30 two field pictures, therefore the F.F. meeting causes a part of image not show on display device, this part image can be decoded from compressed bit stream and be come out and do not show, also can decode and directly skip.
At present, when F.F., all images in the video file behind the compressed encoding is all decoded, but the video fast forward scheme of display part image only because too high to the decoding request of system, overhead is big, therefore be not widely adopted.Extensively the video fast forward method that adopts is: the video coding end is when carrying out compressed encoding to video file, insert key images at interval with regular time, in compressed bit stream, key images is identified simultaneously, and the coding of key images does not rely on non-key image; When decoding end is decoded, only decode and show all or part of key images.Here, the image of decoding when key images is F.F. is that the coding of key images does not rely on non-key image for the non-key image of not decoding during with respect to F.F..In the prior art, key images generally adopts intraframe coding, and promptly key images is the I image, and it only uses the pixel in this frame when compressed encoding, and can be with reference to other image, thereby obtains independence preferably.When video compression coding adopted the field coding mode, key images all was arranged in the field, top and the field, the end of a two field picture.
Because key images will keep independent with non-key image, can not be when promptly compressing with reference to non-key image, so the compression performance of key images is than the compression performance during to non-key image encoding is low with conventional coded system.Insert the technical scheme of key images in the prior art by regular time at interval,, cause the compression performance of whole video file to reduce owing to insert the lower key images of compression performance continually.If key images is the I image, then this shortcoming is more obvious.And big and exist under the situation of a large amount of still frames at video file, insert the F.F. technology of key images by the set time, make ferret out video institute's time spent also longer.
In sum, pressing Fixed Time Interval in the prior art, to insert the compression performance of video fast forward method of key images lower, and ferret out video institute's time spent is also longer.
Summary of the invention
The embodiment of the invention provides a kind of decoding method that is applicable to video fast forward, and this method has improved video compression performance, has accelerated the speed of ferret out video.
The embodiment of the invention provides a kind of coding and decoding device that is applicable to video fast forward, and this device has improved the performance of video compression, has accelerated the speed of ferret out video.
The embodiment of the invention provides a kind of video compressing and encoding method, and this method has improved the performance of video compression.
The embodiment of the invention also provides a kind of video compression coding device, and this device has improved the performance of video compression.
The technical scheme of the embodiment of the invention specifically is achieved in that
The embodiment of the invention discloses a kind of decoding method that is applicable to video fast forward, this method comprises:
With preassigned image encoding in the video sequence to be encoded is key images;
For each image after the preassigned image in the described video sequence, this image be moving image and this image and between key images interval greater than or when equaling preset value, be key images with this image encoding;
The key images of when video fast forward, only decoding.
The embodiment of the invention discloses a kind of coding and decoding device that is applicable to video fast forward, comprising:
Coding module, being used for the preassigned image encoding of video sequence to be encoded is key images; To each image after the preassigned image in the described video sequence to be encoded, this image be moving image and this image and between key images interval greater than or when equaling preset value, with this image encoding is key images, the video sequence after obtaining encoding;
The F.F. module, the key images of the video sequence behind the described coding that is used for when video fast forward, only decoding.
The embodiment of the invention discloses a kind of video compressing and encoding method, this method comprises:
With preassigned image encoding in the video sequence to be encoded is key images;
For each image after the preassigned image in the described video sequence to be encoded, this image be moving image and this image and between key images interval greater than or when equaling preset value, be key images with this image encoding.
The embodiment of the invention also discloses a kind of video compression coding device, this device comprises:
Judging unit is used for when present image is the preassigned image of video sequence to be encoded, sends indication information; For each present image after the described preassigned image in the video sequence to be encoded, judge this current image be moving image and this current image and between key images interval greater than or when equaling preset value, send indication information;
Coding unit is used for when receiving the indication information of judging unit transmission present image being encoded to key images.
As seen from the above technical solution, the embodiment of the invention, present image be moving image and and on time interval between key images satisfy under the situation of certain condition and just present image be encoded to key images, when video fast forward, only the decode technical scheme of key images, avoided in a large amount of continuous rest images, inserting key images continually, thereby improved the compression performance of video sequence and the speed of ferret out video when F.F..
Description of drawings
Fig. 1 is a kind of implementation procedure flow chart that is applicable to the decoding method of video fast forward at coding side of the embodiment of the invention;
Fig. 2 is a kind of structured flowchart that is applicable to the coding and decoding device of video fast forward of the embodiment of the invention;
Fig. 3 is the structured flowchart of a kind of video compression coding device of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 1 is a kind of implementation procedure flow chart that is applicable to the decoding method of video fast forward at coding side of the embodiment of the invention.As shown in Figure 1, may further comprise the steps:
In this step, N generally gets natural number, can certainly get a positive number arbitrarily.Because the value of N size directly influences the performance of video compression, therefore in the embodiment of the invention, for the high video compression performance of F.F. technology that under same scene, obtains inserting key images by " fixed intervals " than existing, the value size of N can be with reference to " fixed intervals " of the prior art, can get and described " fixed intervals " identical value such as the value of N, N also can get and described " fixed intervals " different value certainly.
In this step, first image setting with video sequence is because of containing much information that first image comprises for first key images.Certainly, also the image except that first image in the video sequence can be appointed as first key images in advance.
In this step, first image setting is key images after, can in encoding code stream, this key images mark be come out, so that corresponding decoder can be discerned this key images when decoding.The method of mark key images can be in encoding code stream: if selected video compression protocols provides tag field, then can directly use this tag field to identify key images; If selected video compression protocols does not provide tag field, can in encoding code stream, add the access customer private data with the mark key images, corresponding decoder must be able to be discerned this user's private data.These all are prior aries, no longer describe in detail here.
In the present embodiment, timing variable n is used for the number of frame is counted, so n is a variable about the time, and constant N is also represented the number of frame, so N also is a constant about the time.
In this step, can pass through motion detection algorithm, variable threshold value is set judge whether present image is moving image.Motion detection algorithm is a prior art, no longer describes in detail here.
Whether step 103, the value of judging timing variable n more than or equal to preset value N, if then execution in step 104, otherwise execution in step 105.
In this step, by judging that whether n is more than or equal to preset value N, detect time interval between a present image and the last key images whether more than or equal to the Preset Time that inserts key images N at interval, to guarantee that not moving image is set to key images continually.
In this step, in order to improve the compression performance of key images, key images is encoded to the P image, promptly the coding of a key images need be with reference to the one or more key images before this key images.A reference picture list is set in this enforcement is used to preserve current by the key images of reference, and the coding of current key images is only with reference to its previous key images, and at this moment, the key images tabulation only is used to preserve a key images.When the coding of a key images need be with reference to M key images before this key images, key images was tabulated and is used to preserve M key images, and M is the positive integer more than or equal to 1.In this step, current key images is encoded into the P image after, this key images is saved in the reference listing, with by follow-up key images coding institute reference, when this key images is deleted this key images during no longer by reference.
In this step, in order to improve the fault-tolerance of compressed bit stream, also several key images are encoded under the situation of P image in front, and current key images is encoded to the I image, and promptly the coding of the image of this current key does not need with reference to any other image.After current key images is encoded into the I image, this key images is saved in the reference listing, with by follow-up key images coding institute reference, when this key images is deleted this key images during no longer by reference.Certainly, if follow-up key images also will be encoded to the I image, and this current key images need not this current key images is saved in the reference listing during not by reference possible.
In this step, the presence mode coding can be encoded to the field, top of present image key images down, also field, the end coding key images of present image can further can be improved the compression performance of key images like this.
In this step, also need the mark key images.
In this step, non-key image and key images are comparatively speaking, present image is encoded to non-key image, promptly be with the video compression protocols standard of present image according to routine, as H.246, the requirement of MPEG-4 etc. is encoded, and encodes with reference to the one or more images before the present image.
It is a preferred embodiment that the timing variable adds 1, in actual applications, can add a fixedly constant, as 2,4.
Arrive this, finish a kind of implementation procedure that realizes the method for video fast forward at coding side of the embodiment of the invention, obtained the video sequence behind the compressed encoding.
A kind of method of video fast forward that realizes of the embodiment of the invention in the implementation procedure of decoding end is: if there is not the F.F. requirement, then the coded sequence after the compression is carried out conventional decoding and broadcast; If the F.F. requirement is arranged, the key images of then only decoding is play the key images of part or all of decoding.
The decoding key images process in, the mark according to key images in the code stream identifies key images, key images is saved in the reference picture list, up to this key images no longer by reference.If key images has adopted a coding mode coding, for example adopted a top coding mode, then after key images is decoded, can utilize interpolation algorithm that decoded key images is carried out further interpolation processing, with the field, the end of compensation key images.
By the above embodiments as seen, the method that the embodiment of the invention is a kind of to realize video fast forward only present image be moving image and and on time interval between key images satisfy the technical scheme that just present image is encoded to key images under the situation of certain condition, avoided in a large amount of continuous rest images, inserting key images continually, thereby improved the compression performance of video sequence and the speed of ferret out video when F.F..
Fig. 2 is a kind of structured flowchart that is applicable to the coding and decoding device of video fast forward of the embodiment of the invention.As shown in Figure 2, this device comprises: coding module 201 and F.F. module 202.
In Fig. 2, coding module 201, being used for the preassigned image encoding of video sequence to be encoded is key images; To each image after the preassigned image in the described video sequence to be encoded, this image be moving image and this image and between key images interval greater than or when equaling preset value, be key images with this image encoding; Video sequence after obtaining encoding.
F.F. module 202, the key images of the video sequence behind the described coding that is used for when F.F., decoding.
In Fig. 2, coding module 201 comprises: judging unit 205 and coding unit 206, it realizes that described is key images with preassigned image encoding in the video sequence, to each image after the preassigned image, this image be moving image and this image and between key images interval greater than or when equaling preset value, with this image encoding is that key images is specifically as follows: judging unit 205, be used to be provided with a preset value and initial value and be zero timing variable, and when present image is first image of video sequence, send indication information to coding unit 206; For each present image after first image in the video sequence, be used for judging that whether this current image is whether moving image and timing variable are more than or equal to preset value, when judging this current image is that moving image and timing variable are during more than or equal to preset value, send indication information to coding unit 206, with the zero clearing of timing variable, otherwise, on the timing variable, add a fixedly constant;
In device shown in Figure 2, if coding module 201 is encoded to key images with the field, top or the field, the end of described image, then this device also further comprises interpolation algorithm processing module 203, be used for 202 decoded key images of F.F. module being carried out interpolation processing, with the field, the end or the field, top of compensation key images according to interpolation algorithm.
In device shown in Figure 2, if coding module 201 is encoded to the P image with key images, then this device further comprises reference pictures store module 204, is used for the image that memory encoding module 201 sends; Coding module 201, be used for image according to reference pictures store module 204, present image is encoded to key images, coded intact key images is sent to reference pictures store module 204 store, and in the deletion reference pictures store module 204 no longer by the key images of reference.
The device of realization video fast forward shown in Figure 2 has been avoided inserting key images continually when coding in a large amount of continuous rest images, thereby has been improved the compression performance of video sequence, and improved the speed of ferret out video when the decoding end F.F..
Fig. 3 is the structured flowchart of a kind of video compression coding device of the embodiment of the invention.This device comprises as shown in Figure 3: judging unit 301 and coding unit 302.
Judging unit 301 in Fig. 3, are used for sending indication information to coding module when present image is the preassigned image of video sequence; For each present image after the described preassigned image in the video sequence, judge this current image be moving image and this current image and on interval between key images during more than or equal to preset value, send indication informations to coding unit 302;
In the embodiment shown in fig. 3, for assist judging unit 301 realize described to judge present image be moving image and present image with on interval between key images during more than or equal to preset value to the function of coding unit 302 transmission indication informations, this video compression coding device can also comprise that an initial count value is zero counter 303, the with dashed lines frame table shows in Fig. 3, at this moment:
Described judging unit 301 is used to be provided with a preset value, and when present image is first image of video sequence to be encoded, sends indication information to coding unit 302; For each present image after first image in the video sequence to be encoded, be used to judge that whether this current image is whether the count value of moving image and counter 303 is more than or equal to preset value, when judging this current image is that the count value of moving image and counter 303 is during more than or equal to preset value, send indication information to coding unit 302, send clear command to counter 303, otherwise, send the counting instruction to counter 303;
Described counter 303 is used for when receiving clear command, with the count value zero clearing of self, when receiving the counting instruction, adds a fixedly constant on the count value of self.
The device of realization video compression coding shown in Figure 3 has been avoided inserting key images continually when coding in a large amount of continuous rest images, thereby has been improved the compression performance of video sequence.
In sum, the embodiment of the invention by at present image be moving image and and on interval between key images satisfy the technical scheme that just present image is encoded to key images under the situation of certain condition, avoided in a large amount of continuous rest images, inserting key images continually, thereby improved the compression performance of video sequence, and when F.F. the speed of ferret out video.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1, a kind of decoding method that is applicable to video fast forward is characterized in that, this method comprises:
With preassigned image encoding in the video sequence to be encoded is key images;
For each image after the preassigned image in the described video sequence, this image be moving image and this image and between key images interval greater than or when equaling preset value, be key images with this image encoding;
The key images of when video fast forward, only decoding.
2, the method for claim 1 is characterized in that,
Described preassigned image is first image in the described video sequence to be encoded;
Described this image be moving image and this image and between key images interval greater than or when equaling preset value, be that the step of key images comprises with this image encoding:
A preset value and initial value be set be zero timing variable;
When encoding, judge that whether this image is whether moving image and timing variable are more than or equal to preset value for each image after first image in the video sequence; When judging this image is moving image and timing variable during more than or equal to preset value, is key images with this image encoding, the zero clearing of timing variable, otherwise, on the timing variable, add a fixedly constant.
3, method as claimed in claim 1 or 2 is characterized in that, described is that key images comprises with this image encoding: under the coding mode on the scene, the field, top or the field, the end of this image is encoded to key images.
4, method as claimed in claim 3 is characterized in that, describedly further comprises after the key images in decoding: with interpolation algorithm decoded key images is carried out interpolation processing.
5, method as claimed in claim 1 or 2 is characterized in that, described is that key images comprises with this image encoding:
With reference to the more than one key images before this image, be key images with this image encoding; Or
, be not key images with this image encoding with reference to any image.
6, method as claimed in claim 5, it is characterized in that, when described be that key images is with reference to the more than one key images before this image with this image encoding, when this image encoding is key images, further comprise after this image encoding is key images described: this key images is saved in the reference picture list; The coding of the key images after this key images is deleted this key images during no longer with reference to this key images from reference picture list;
Describedly specifically comprise, with reference to the key images in the described reference picture list with reference to the more than one key images before this image.
7, a kind of coding and decoding device that is applicable to video fast forward is characterized in that, comprising:
Coding module, being used for the preassigned image encoding of video sequence to be encoded is key images; To each image after the preassigned image in the described video sequence to be encoded, this image be moving image and this image and between key images interval greater than or when equaling preset value, with this image encoding is key images, the video sequence after obtaining encoding;
The F.F. module, the key images of the video sequence behind the described coding that is used for when video fast forward, only decoding.
8, device as claimed in claim 7 is characterized in that, described coding module comprises: judging unit and coding unit, wherein,
Judging unit is used to be provided with a preset value and an initial value is zero timing variable, and when present image is first image of video sequence, sends indication information to coding unit; For each present image after first image in the video sequence, be used for judging that whether this current image is whether moving image and timing variable are more than or equal to preset value, when judging this current image is that moving image and timing variable are during more than or equal to preset value, send indication information to coding unit, with the zero clearing of timing variable, otherwise, on the timing variable, add a fixedly constant;
Coding unit is used for when receiving the indication information that judging unit sends present image being encoded to key images.
9, as claim 7 or 8 described devices, it is characterized in that this device further comprises the interpolation algorithm processing module,
Described coding module is used for the field, top or the field, the end of image are encoded to key images;
Described interpolation algorithm processing module is used for according to interpolation algorithm the decoded key images of F.F. module being carried out interpolation processing.
10, as claim 7 or 8 described devices, it is characterized in that this device further comprises the reference pictures store module, be used to store the image that described coding module sends;
Described coding module, be used for image according to the reference pictures store module, with image encoding is key images, coded intact key images is sent to the reference pictures store module stores, and in the deletion reference pictures store module no longer by the key images of reference.
11, a kind of video compressing and encoding method is characterized in that, this method comprises:
With preassigned image encoding in the video sequence to be encoded is key images;
For each image after the preassigned image in the described video sequence to be encoded, this image be moving image and this image and between key images interval greater than or when equaling preset value, be key images with this image encoding.
12, method as claimed in claim 11 is characterized in that,
Described preassigned image is first image in the video sequence;
Described this image be moving image and this image and between key images interval greater than or when equaling preset value, be that the step of key images comprises with this image encoding:
A preset value and initial value be set be zero timing variable;
When encoding, judge that whether this image is whether moving image and timing variable are more than or equal to preset value for each image after first image in the video sequence; When judging this image is moving image and timing variable during more than or equal to preset value, is key images with this image encoding, the zero clearing of timing variable, otherwise, on the timing variable, add a fixedly constant.
13, a kind of video compression coding device is characterized in that, this device comprises:
Judging unit is used for when present image is the preassigned image of video sequence to be encoded, sends indication information; For each present image after the described preassigned image in the video sequence to be encoded, judge this current image be moving image and this current image and between key images interval greater than or when equaling preset value, send indication information;
Coding unit is used for when receiving the indication information that judging unit sends present image being encoded to key images.
14, device as claimed in claim 13 is characterized in that, this device comprises that an initial count value is zero counter;
Described judging unit is used to be provided with a preset value, and when present image is first image of video sequence, sends indication information to coding unit; For each present image after first image in the video sequence, be used to judge that whether this current image is whether the count value of moving image and described counter is more than or equal to preset value, when count value that to judge this current image be moving image and counter during more than or equal to preset value, send indication information to coding unit, send clear command to counter, otherwise, send the counting instruction to counter;
Described counter is used for when receiving clear command, with the count value zero clearing of self, when receiving the counting instruction, adds a fixedly constant on the count value of self.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986242A (en) * | 2010-11-03 | 2011-03-16 | 中国科学院计算技术研究所 | Method for tracking target track in video compression coding process |
| WO2024109701A1 (en) * | 2022-11-24 | 2024-05-30 | 维沃移动通信有限公司 | Video encoding/decoding method and apparatus, electronic device, and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986242A (en) * | 2010-11-03 | 2011-03-16 | 中国科学院计算技术研究所 | Method for tracking target track in video compression coding process |
| WO2024109701A1 (en) * | 2022-11-24 | 2024-05-30 | 维沃移动通信有限公司 | Video encoding/decoding method and apparatus, electronic device, and medium |
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