CN100375507C - Image processing apparatus, image recording apparatus, and image processing method - Google Patents
Image processing apparatus, image recording apparatus, and image processing method Download PDFInfo
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Abstract
An image processing apparatus includes a histogram computing section which computes a histogram of pixel values of input image data. A gradation conversion characteristic determining section determines a gradation conversion characteristic in a case where gradation conversion processing is applied to the image data on the basis of the histogram computed by the histogram computing section, and photographing information when the image data has been picked up. A gradation converting section converts the gradation of the input image data on the basis of the gradation conversion characteristic determined by the gradation conversion characteristic determining section.
Description
Technical field
The present invention relates to image processing apparatus, image recording structure and image processing method, particularly relate to the image processing apparatus, image recording structure and the image processing method that image are carried out adaptively greyscale transform process.
Background technology
The gray scale performance of image is one of important factor of decision picture quality.Usually from the signal of imaging apparatus output roughly with incide imaging apparatus on the light quantity of light be directly proportional.At this, about output signal, consistently be carried out certain greyscale transform process with final image observation environment (for example the image viewing that is undertaken by monitor or by the image viewing of printer output decision etc.) in the image processing afterwards from imaging apparatus.For example, under the situation of general digital camera, adopted the reference colour space of the sRGB color space as image file format, but the gray scale will be designed to the gray scale that digital camera has carried out the image of photography to be suitable for most carried out showing with the monitor with γ (gamma) characteristic (γ=2.2) in the regulation that is present in sRGB the time.
Usually, generally in the various input units of digital camera etc., the greyscale transformation characteristic of image is fixed as a kind ofly, or waits the greyscale transformation characteristic of selection image from multiple greyscale transformation characteristic by the user.In addition, using in recent years with the Luminance Distribution of image (or scene) and consistently separately image is made the optimized technology of greyscale transformation characteristic adaptively.This be because, because dynamic range being shot is different in each scene, thus do not consider this difference with same greyscale transformation characteristic conversion situation under just be difficult to reflect efficiently in the dynamic range at the output device of monitor or printer etc. the monochrome information of field being shot.
As separately image is made one of optimized technology of greyscale transformation characteristic adaptively, can enumerate histogram equalization method.This method is to increase monochrome information amount that image has, output device is distributed efficiently the technology of gray scale by the brightness histogram that makes image (the frequency number of each brightness level) the evenly such greyscale transformation that becomes.
At this, if irrespectively use such greyscale transformation without exception with photography conditions or scene, thereby then for example the noise of dark sometimes portion surpass permissible level etc. because of greyscale transformation is exaggerated because the cause of image (scene) has been transformed on unfavorable direction.
Example as its solution, in the technology that in patent documentation 1, is proposed, the Luminance Distribution of detected image, judge whether must carry out the correction of Luminance Distribution by detected Luminance Distribution, under the situation that is judged to be the correction that to carry out Luminance Distribution, Luminance Distribution is become evenly prevent the mis-behave of output image by proofreading and correct.
[patent documentation 1] spy opens the 2003-179809 communique
But, about the technology that in above-mentioned patent documentation 1, is proposed, owing to judge the necessity of the correction of Luminance Distribution from the Luminance Distribution of subject, so the condition different image of the optimum value after the greyscale transformation characteristic that for example comprises the image of the noise that causes greatly because of tele-release for the brightness of scene or specify image that the kind (landscape, personage etc.) of subject photographed etc. and the greyscale transformation during with photography is difficult to carry out respectively best greyscale transform process low, morely.
Summary of the invention
The present invention carries out in view of above-mentioned situation, and its purpose is to provide the image processing apparatus and the image processing method of the greyscale transform process of the scene in the time of can irrespectively most being suitable for photographing with photography conditions.
To achieve the above object, the image processing apparatus of the 1st mode of the present invention is the image processing apparatus that carries out image processing for input picture, it is characterized in that possessing: histogram calculation portion, the histogram of the pixel value of the view data that calculating has been transfused to; Greyscale transformation characteristic determination section is according to the above-mentioned histogram that has been calculated by above-mentioned histogram calculation portion with relate to the information of the above-mentioned view data that has been transfused to, the greyscale transformation characteristic when decision is carried out greyscale transform process to above-mentioned view data; And greyscale transform process portion, according to by the determined above-mentioned greyscale transformation characteristic of above-mentioned greyscale transformation characteristic determination section, the above-mentioned view data that has been transfused to is carried out greyscale transform process, the greyscale transformation characteristic of the above-mentioned view data of conversion.
To achieve the above object, the image recording structure of the 2nd mode of the present invention is the image recording structure that carries out image processing and record for input picture, it is characterized in that possessing: image pickup part, being shot is made a video recording to obtain view data; The histogram of the pixel value of the view data that is obtained by above-mentioned image pickup part calculates in histogram calculation portion; Greyscale transformation characteristic determination section, the photographic information when having carried out photography, the greyscale transformation characteristic when decision is carried out greyscale transform process to above-mentioned view data according to the above-mentioned histogram that has calculated by above-mentioned histogram calculation portion with to above-mentioned view data; Greyscale transformation portion is according to by the determined above-mentioned greyscale transformation characteristic of above-mentioned greyscale transformation characteristic determination section the above-mentioned view data that has been transfused to being carried out greyscale transformation; And recording portion, the view data that record has carried out greyscale transformation by above-mentioned greyscale transformation portion on recording medium.
To achieve the above object, the image processing method of the 3rd mode of the present invention is the image processing method that carries out image processing for input picture, it is characterized in that having: the histogrammic histogram calculation operation of calculating the pixel value of the view data that has been transfused to; The greyscale transformation characteristic decision operation of the greyscale transformation characteristic the when photographic information when having carried out photography according to the above-mentioned histogram that has been calculated in the above-mentioned histogram calculation operation with to above-mentioned view data decides above-mentioned view data carried out greyscale transform process; And according to the greyscale transformation operation of in above-mentioned greyscale transformation characteristic decision operation, the above-mentioned view data that has been transfused to being carried out greyscale transformation by determined above-mentioned greyscale transformation characteristic.
According to the 1st～the 3rd mode, the photographic information when considering to have obtained view data when carrying out greyscale transformation characteristic that greyscale transformation uses in decision, the greyscale transform process of the scene in the time of can irrespectively most being suitable for photographing with photography conditions.
According to the present invention, can provide image processing apparatus, image recording structure and the image processing method of the greyscale transform process of the scene in the time of irrespectively most being suitable for photographing with photography conditions.
Description of drawings
Fig. 1 shows the figure of the conceptual structure of the image processing apparatus relevant with one embodiment of the present invention.
Fig. 2 is the block diagram of structure that illustrates as the digital camera of an example of the image recording structure that comprises the image processing apparatus relevant with one embodiment of the present invention.
Fig. 3 shows the figure of the example of acquiescence greyscale transformation table.
Fig. 4 shows the figure of the example of noise characteristic information.
Fig. 5 shows the figure of the example of the synthetic ratio of gray scale.
Fig. 6 shows the flow chart of the photography control that comprises the image processing method relevant with one embodiment of the present invention.
Fig. 7 is the figure that histogrammic example is shown.
Fig. 8 illustrates the flow chart that histogram modification is handled.
Fig. 9 is the histogrammic figure that illustrates after the frequency value limits.
Figure 10 is the figure that the example of accumulation histogram is shown.
Figure 11 is the flow chart that the computing of greyscale transformation table is shown.
Figure 12 is the figure that the synthetic example of acquiescence greyscale transformation table and accumulation histogram is shown.
Embodiment
Following with reference to the description of drawings embodiments of the present invention.
Fig. 1 shows the figure of the conceptual structure of the image processing apparatus relevant with one embodiment of the present invention.
As shown in fig. 1, this image processing apparatus is made of histogram calculation portion 1, greyscale transformation characteristic determination section 2 and greyscale transformation portion 4.If view data is imported histogram calculation portion 1, then in histogram calculation portion 1, calculate the histogram of the pixel value of input image data.About histogram, the histogram (brightness histogram) of luminance component that can a computed image data, but the also histogram of every kind of color component of computed image data.
Histogram calculation portion 1 fall into a trap calculated histogram after, to the calculated histogram of greyscale transformation characteristic determination section 2 input.In greyscale transformation characteristic determination section 2, the photographic information 3 decision greyscale transformation characteristics when having carried out photography according to histogram with to view data.Then,, in greyscale transformation portion 4, carry out the greyscale transform process of input image data, the outside is exported as output image data according to the greyscale transformation characteristic that has been determined.
Below, be described more specifically the image processing apparatus of Fig. 1.Fig. 2 is the block diagram of structure that illustrates as the digital camera (hereinafter referred to as camera) of an example of the image recording structure that comprises the image processing apparatus relevant with one embodiment of the present invention.
As shown in Figure 2, this digital camera is made of following part: microcomputer 11; Image pickup part 12; A/D transformation component (being designated as A/D in the drawings) 13; Bus 14; RAM15; Image processing circuit 16; ROM17; Recording medium 18; And operating portion 19.
The converting electrical signal that A/D transformation component 13 will obtain with image pickup part 12 is that numerical data is to generate view data.
Memory as the various set points of the ROM17 of noise characteristic storage part, the fixedly greyscale transformation characteristic storage part various control programs that to be storage carried out by microcomputer 11 or this camera.It is synthetic than 32 particularly to have stored acquiescence greyscale transformation table 30, noise characteristic information 31 and gray scale in the ROM17 of present embodiment.
Acquiescence greyscale transformation table 30 is the greyscale transformation tables that have the characteristic of the standard that has been stored as fixing characteristic in ROM17 for every kind of camera.The example of acquiescence greyscale transformation table 30 is shown with the solid line of Fig. 3.At this, the transverse axis presentation video input value of Fig. 3.Have, the image input value of Fig. 3 is the pixel value of the view data imported from A/D transformation component 13 again.In addition, the longitudinal axis in the left side of Fig. 3 is represented the output valve (8 output) after the greyscale transformation.Have, the acquiescence greyscale transformation table that has been stored in ROM17 is not limited to 1 again.For example, also can store a plurality of different acquiescence greyscale transformation tables in advance, the user can at random select to give tacit consent to the greyscale transformation table.Perhaps, also can from a plurality of acquiescence greyscale transformation tables, automatically select best acquiescence greyscale transformation table according to photography conditions.
At this, noise characteristic information 31 is the amounts that change with the photography sensitivity in when photography or temperature, time for exposure etc.For example, under the highly sensitive situation of the photography in when photography, the noise quantitative change is big.Therefore, also can in ROM17, store in advance and the photography variation of sensitivity or variations in temperature, the corresponding a plurality of noise characteristic information of exposure time change, when view data photograph, read and photography sensitivity at this moment or temperature, corresponding noise characteristic information of time for exposure.
In addition, in camera in recent years, because the camera of the reduction noise processed function of the noise of the image when also having proposed to have the reduction photography, so also can in ROM17, store the noise characteristic information that reduces the state of noise processed that has been carried out accordingly in advance with it.
The synthetic ratio 32 of gray scale is synthetic acquiescence greyscale transformation table 30 and the synthetic ratio when the accumulation histogram of explanation thereafter.The example of the synthetic ratio 32 of gray scale shown in Figure 5.As shown in Figure 5, gray scale is synthetic than the 32 storages value corresponding with scene mode.At this, scene mode is with various settings one of the photograph mode of usefulness of photographing, and is the pattern of the scene in the time of can setting photography.By carrying out the setting of scene mode, can automatically select to be suitable for the set point of scene separately with the control etc. that exposes.In the present embodiment, as the synthetic ratio of the gray scale corresponding with scene mode, for example store with the mode standard of the usefulness of photographing with the setting of standard, with the setting that is suitable for landscape photography photograph the landscape configuration of usefulness, with photograph personage's pattern of usefulness and of the setting that is suitable for personage's photography with the setting that the is suitable for the night scene photography corresponding synthetic ratio of gray scale of night scene mode of usefulness of photographing, but be not limited thereto.
With reference to Fig. 6, the photography control in the camera with the such structure of Fig. 2 is described.Fig. 6 is the flow chart that the operation of the photography control that comprises the image processing method relevant with one embodiment of the present invention is shown.At this, the flow chart of Fig. 6 is to begin by the making operation that is carried out shutter release button by the user.
If connect shutter release button, then carry out well-known AE and AF (step S1) according to the output of image pickup part 12 by the user.Thereafter, the control (step S2) that exposes can obtain recording picture signal in image pickup part 12.Thereafter, to the recording picture signal that obtains in the image pickup part 12 processing (step S3) of making a video recording.In this shooting is handled, the picture signal that has obtained is carried out the A/D conversion in A/D transformation component 13 in image pickup part 12.The view data that will obtain in A/D transformation component 13 is input in the WB correction unit 20 of image processing circuit 16.
In WB correction unit 20, carry out the white balance correction (step S4) of view data.In white balance correction, the R of image correcting data gain and B gain become suitable so that be input to the white of the image in the WB correction unit 20.The view data that to carry out white balance correction in WB correction unit 20 is input in the portion of change simultaneously 21.
Change processing (step S5) at the same time in the change portion 21 simultaneously.Change at the same time in the processing, utilizing the view data of interpolation from be input to the portion of change simultaneously 21 to generate with the RGB3 look is the view data of 1 pixel component.The view data of having carried out changing simultaneously processing in the change portion 21 at the same time is input in the Y/C separated part 22.
In Y/C separated part 22, carry out Y/C separating treatment (step S6).The view data that will be transfused in the Y/C separating treatment is separated into Y (brightness) signal and C (look) signal.Y-signal in the separated signal is input in histogram calculation portion 25 and the greyscale transformation portion 29, the C signal in the separated signal is input in the look transformation component 23.
In look transformation component 23, carry out look conversion process (step S7).In the look conversion process, will be input to C signal in the look transformation component 23 and be transformed to the reference colour signal of sRGB etc. with camera etc.The signal that will carry out the look conversion process in look transformation component 23 is input in the JPEG compression unit 24.
In histogram calculation portion 25, carry out histogram calculation and handle (step S8).The frequency value compute histograms (brightness histogram) of each brightness input of the Y-signal in histogram calculation is handled from be input to histogram calculation portion 25.Be illustrated in the histogrammic example that has been calculated in the histogram calculation portion 25 with the solid line of Fig. 7.At this, the transverse axis of Fig. 7 is represented the brightness input value.In addition, the longitudinal axis in the left side of Fig. 7 is represented Luminance Distribution, is the frequency value of brightness input.The histogram that will be in histogram calculation portion 25 have been calculated is input in the histogram modification portion 26.
Have again, in the present embodiment, come compute histograms from the luminance component of view data, but but the also histogram of the colouring component of computed image data.In this case, can calculate RGB3 look whole histogram, also can only calculate the histogram of G component.
In histogram modification portion 26, carry out histogram modification and handle (step S9).In histogram modification is handled,, the histogram that has been calculated in histogram calculation portion 25 is revised according to the noise characteristic information 31 that is stored among the ROM17.
With reference to Fig. 8 the histogram modification processing is described.In histogram modification is handled, at first read out in the acquiescence greyscale transformation table 30 (step S21) that has been stored among the ROM17.Secondly, calculate the slope (step S22) of acquiescence greyscale transformation table 30.At this, by acquiescence greyscale transformation table 30 is carried out the slope that differential can obtain giving tacit consent to greyscale transformation table 30.For example, illustrate at solid line under the situation of acquiescence greyscale transformation table 30, with its slope that is shown in dotted line of Fig. 3 with Fig. 3.
Behind the slope that has calculated acquiescence greyscale transformation table 30, read out in the noise characteristic information 31 (step S23) that has been stored among the ROM17.Secondly, the noisiness after the deduction greyscale transformation.Noisiness after the greyscale transformation is the product of the magnification ratio of the noise after noisiness and the greyscale transformation.At this, the slope that is used among the step S22 acquiescence greyscale transformation table 30 that has been calculated is represented the magnification ratio of the noise after the greyscale transformation.Thereby, noisiness after the greyscale transformation becomes with noisiness shown in the solid line of Fig. 4 and product with the slope of the acquiescence greyscale transformation table that is shown in dotted line of Fig. 3, consequently, the noisiness after the resulting greyscale transformation becomes the noisiness that is shown in dotted line with Fig. 4.Shown in the dotted line of Fig. 4, at the peak value that in original image, in dark part, presents noisiness after the greyscale transformation.This is because utilize greyscale transformation to extend the dark part of original image, the part that compression is bright.
After having inferred the noisiness after the greyscale transformation,, determine histogrammic frequency value limit levels (step S24) in order to carry out histogrammic correction.At this, in the present embodiment, limit histogrammic frequency value in the inapparent mode that becomes of the noise after the greyscale transformation.For this reason, the inverse of the noisiness after the calculating greyscale transformation is as frequency value limit levels.In this frequency value limit levels shown in the dotted line of Fig. 7.As shown in Figure 7, the limit levels of frequency value becomes big in the part that the noise quantitative change after greyscale transformation is big.
At this, in the present embodiment, histogrammic frequency value limit levels is decided to be the inverse of the noisiness after the greyscale transformation, but for example also can carries out set computing behind the inverse to obtain more appropriate frequency value limit levels having calculated.
After having determined frequency value limit levels, the part that surpasses frequency value limit levels in histogram is limited (step S25) as shown in Figure 9.By using the histogram that has carried out by this way revising to carry out greyscale transformation, it is not remarkable that the noise after the greyscale transformation becomes.
At this, turn back to the explanation of Fig. 6 again.To be input in the histogram accumulation portion 27 with the histogram that histogram modification portion 26 has carried out revising.In histogram accumulation portion 27, carry out histogram accumulated process (step S10).In the histogram accumulated process, the histogram that is imported in the histogram accumulation portion 27 is accumulated successively from low-light level component one side.
The example of accumulation histogram shown in Figure 10.At this, the solid line of Figure 10 is illustrated in and carries out the preceding accumulation histogram of histogrammic correction in the histogram modification portion 26.In addition, being shown in dotted line of Figure 10 carried out histogrammic revised accumulation histogram in histogram modification portion 26.But, histogrammic revised accumulation histogram is standardized, make that the maximum of the accumulation frequency that maximum (sum that is equivalent to frequency) and the histogram modification of accumulation frequency is preceding is consistent.In the accumulation histogram after histogram modification, the slope of the part that the noise quantitative change is big after the greyscale transformation is compared with the accumulation histogram before the histogram modification, becomes mild.
The accumulation histogram that will obtain in histogram accumulation portion 27 is input in the greyscale transformation table calculating part 28.In greyscale transformation table calculating part 28, carry out greyscale transformation table computing (step S11).
With reference to Figure 11, the computing of greyscale transformation table is described.In the computing of greyscale transformation table,, calculate the greyscale transformation table with set synthetic ratio synthetic accumulation histogram that has obtained with histogram accumulation portion 27 and the acquiescence greyscale transformation table 30 that in ROM17, has been stored.
In Figure 11, at first, the scene mode information (step S31) during the check photography.Secondly, according to the scene mode information that has been verified in step S31, judgement should be chosen in what kind of ratio (step S32) of the gray scale synthetic ratio that has been stored among the ROM17.Secondly, synthetic according to estimative gray scale than synthetic acquiescence greyscale transformation table 30 and accumulation histogram (step S33).
The synthetic example of acquiescence greyscale transformation table 30 shown in Figure 12 and accumulation histogram.At this, the thin solid line of Figure 12 illustrates acquiescence greyscale transformation table, and Figure 12 is shown in dotted line accumulation histogram, and the thick solid line of Figure 12 is illustrated in the final greyscale transformation table that obtains after synthetic.In addition, in the example of Figure 12, scene mode is mode standard (gray scale is synthetic than 0.5: 0.5).That is, in the example of Figure 12, because gray scale is synthetic than being 0.5: 0.5, so the greyscale transformation table that obtains after synthesizing is the mean value of acquiescence greyscale transformation table 30 and accumulation histogram.
In addition, though not shown in Figure 12, under the situation that the subject that such contrast is high to landscape is photographed,, can carry out more suitable gray scale performance by improving accumulation histogram one side's ratio.On the contrary, under personage's situation, the contrast of subject originally is low, brings up to for fear of contrast and payes attention to acquiescence greyscale transformation table one side more than the necessary degree.Moreover, under the situation of night scene, the ratio of acquiescence greyscale transformation table one side is improved, so that do not make original dark image bright to more than the necessary degree.Have again, under the situation of night scene, also can not give tacit consent to the synthetic of greyscale transformation table and accumulation histogram.
Have, about the synthetic ratio of gray scale, only be not limited to the storage value corresponding with scene mode in advance, for example also the gray scale corresponding with the setting of Flash Mode or auto exposure mode etc. of storage in advance simultaneously synthesized ratio.For example, the time make under the luminous situation of photoflash lamp,, synthesize and get final product so the ratio that similarly improves accumulation histogram one side with the landscape scene carries out gray scale because the contrast of image improves in photography.In addition, under with such situation of manually exposing, also can forbid synthesizing.Moreover, also can carry out reducing corresponding gray scale such as noise processed function and synthesizing with whether having used.That is, under the situation of having carried out the reduction noise processed, the ratio of acquiescence greyscale transformation table one side is improved.
At this, turn back to the explanation of Fig. 6 again.To be input in the greyscale transformation portion 29 with the greyscale transformation table that greyscale transformation table calculating part 28 has calculated.In greyscale transformation portion 29, carry out greyscale transform process (step S12).In greyscale transform process, the Y-signal of having imported from Y/C separated part 22 is carried out greyscale transformation according to the greyscale transformation table imported from greyscale transformation table calculating part 28.The Y-signal that has been carried out greyscale transformation is input in the JPEG compression unit 24.
In JPEG compression unit 24, Y-signal that has been carried out greyscale transformation and the C signal that has been carried out the look conversion are carried out JPEG compression (step S13).The heading message of the data additional above-mentioned photographic information that be carried out JPEG compression etc. made imaged file (step S14), image file (step S15) that on recording medium 18 record be made to thereafter.Thus, photography control finishes.By also chronophotography information in advance in the heading message of image file, even the greyscale transform process that in reprocessing, also can illustrate in the present embodiment.
As above illustrated, according to present embodiment, when greyscale transformation table when greyscale transformation calculates, because the scene information can reflect photography the time, so the greyscale transform process of the scene that can be suitable for most photographing.
Abovely the present invention has been described, but the present invention is not limited to above-mentioned execution mode, in the scope of main idea of the present invention, can do various distortion or application certainly according to execution mode.For example, above-mentioned a kind of execution mode only is described, even but when the reconstruction of image, also can use technology of the present invention when image photography.
In addition, in above-mentioned a kind of execution mode, the situation of carrying out whole same greyscale transformations in 1 picture has been described, but also 1 picture segmentation can have been become a plurality of zones, in each divided zone, calculated the greyscale transformation table with different conditions.
Moreover, comprised the invention in various stages in the above-described embodiment, utilize the suitable combination of a plurality of inscapes that are disclosed can extract various inventions out.For example, even the whole inscapes that are illustrated from execution mode are deleted several inscapes, also can solve the problem of having narrated in the hurdle of the problem that invention plan to solve, under the situation of the effect of having narrated in effect one hurdle that can obtain inventing, the structure that this inscape is deleted also can be used as invention and is drawn out of.
Claims (7)
1. one kind is carried out the image processing apparatus of image processing for input picture, it is characterized in that possessing:
Histogram calculation portion, the histogram of the pixel value of the view data that calculating has been transfused to;
Greyscale transformation characteristic determination section, the photographic information when having carried out photography, the greyscale transformation characteristic when decision is carried out greyscale transform process to above-mentioned view data according to the above-mentioned histogram that has calculated by above-mentioned histogram calculation portion with to above-mentioned view data; And
Greyscale transformation portion, according to the above-mentioned view data that has been transfused to being carried out greyscale transformation by the determined above-mentioned greyscale transformation characteristic of above-mentioned greyscale transformation characteristic determination section,
When also being included in the above-mentioned greyscale transformation characteristic of decision, above-mentioned greyscale transformation characteristic determination section revises the above-mentioned histogrammic histogram modification portion of having calculated with above-mentioned histogram calculation portion according to above-mentioned photographic information,
The photographic information that is used when above-mentioned histogrammic revise comprises photography sensitivity information when view data carried out photography and expression and whether view data has been carried out reducing some at least information in the reduction noise processed information of noise processed, when above-mentioned histogrammic the correction, use about the information of the noise in image data characteristic corresponding with above-mentioned photography sensitivity information and about with the information of the corresponding noise in image data characteristic of above-mentioned reduction noise processed information in some.
2. the image processing apparatus described in claim 1 is characterized in that,
Also possess the noise characteristic storage part of storage about the information of above-mentioned noise in image data characteristic,
Above-mentioned greyscale transformation characteristic determination section is when above-mentioned histogrammic correction, read the information of the noise characteristic when above-mentioned view data having been carried out photography according to above-mentioned photographic information from above-mentioned noise characteristic storage part, according to the information of this noise characteristic when above-mentioned view data having been carried out photography that has been read out, limit the frequency value of above-mentioned histogrammic specific part.
3. the image processing apparatus described in claim 2 is characterized in that,
Also possess at least a kind of fixedly greyscale transformation characteristic storage part that can use and have the fixedly greyscale transformation characteristic of fixing characteristic without exception to above-mentioned view data of storage,
Above-mentioned greyscale transformation characteristic determination section also carries out following work: when above-mentioned histogrammic correction, the information of the noise characteristic when above-mentioned view data having been carried out photography of having read according to the said fixing greyscale transformation characteristic that has been stored in said fixing greyscale transformation characteristic storage part with from above-mentioned noise characteristic storage part determines the limit amount of above-mentioned frequency value.
One kind for input picture carry out image processing and the record image recording structure, it is characterized in that possessing:
Image pickup part is made a video recording to obtain view data to being shot;
The histogram of the pixel value of the view data that is obtained by above-mentioned image pickup part calculates in histogram calculation portion;
Greyscale transformation characteristic determination section, the photographic information when having carried out photography, the greyscale transformation characteristic when decision is carried out greyscale transform process to above-mentioned view data according to the above-mentioned histogram that has calculated by above-mentioned histogram calculation portion with to above-mentioned view data;
Greyscale transformation portion is according to by the determined above-mentioned greyscale transformation characteristic of above-mentioned greyscale transformation characteristic determination section the above-mentioned view data that has been transfused to being carried out greyscale transformation; And
Recording portion, the view data that record has carried out greyscale transformation by above-mentioned greyscale transformation portion on recording medium,
When also being included in the above-mentioned greyscale transformation characteristic of decision, above-mentioned greyscale transformation characteristic determination section revises the above-mentioned histogrammic histogram modification portion of having calculated with above-mentioned histogram calculation portion according to above-mentioned photographic information,
The photographic information that is used when above-mentioned histogrammic revise comprises photography sensitivity information when view data carried out photography and expression and whether view data has been carried out reducing some at least information in the reduction noise processed information of noise processed, when above-mentioned histogrammic the correction, use about the information of the noise in image data characteristic corresponding with above-mentioned photography sensitivity information and about with the information of the corresponding noise in image data characteristic of above-mentioned reduction noise processed information in some.
5. one kind is carried out the image processing method of image processing for input picture, it is characterized in that having:
Calculate the histogrammic histogram calculation operation of the pixel value of the view data that has been transfused to;
The greyscale transformation characteristic decision operation of the greyscale transformation characteristic the when photographic information when having carried out photography according to the above-mentioned histogram that has been calculated in the above-mentioned histogram calculation operation with to above-mentioned view data decides above-mentioned view data carried out greyscale transform process; And
According to the greyscale transformation operation of in above-mentioned greyscale transformation characteristic decision operation, the above-mentioned view data that has been transfused to being carried out greyscale transformation by determined above-mentioned greyscale transformation characteristic,
The above-mentioned histogrammic histogram modification operation of having been calculated in above-mentioned histogram calculation operation according to above-mentioned photographic information correction when above-mentioned greyscale transformation characteristic decision operation is included in the above-mentioned greyscale transformation characteristic of decision,
The photographic information that is used in above-mentioned histogram modification operation comprises photography sensitivity information when view data carried out photography and expression and whether view data has been carried out reducing some at least information in the reduction noise processed information of noise processed, in above-mentioned histogram modification operation, use about the information of the noise in image data characteristic corresponding with above-mentioned photography sensitivity information and about with the information of the corresponding noise in image data characteristic of above-mentioned reduction noise processed information in some.
6. the image processing method described in claim 5 is characterized in that,
Limit the frequency value of above-mentioned histogrammic specific part by information, carry out the above-mentioned histogrammic correction in the above-mentioned histogrammic correction operation according to the noise characteristic when above-mentioned view data having been carried out photography.
7. the image processing method described in claim 6 is characterized in that:
In above-mentioned histogram modification operation, also carry out following work: the limit amount that decides above-mentioned frequency value according to the information of the fixedly greyscale transformation characteristic that can use and have fixing characteristic to above-mentioned view data without exception and the noise characteristic when above-mentioned view data having been carried out photography.
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| JP2004267072A JP4803982B2 (en) | 2004-09-14 | 2004-09-14 | Image processing apparatus, image recording apparatus, and image processing method |
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| CN100375507C true CN100375507C (en) | 2008-03-12 |
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| US8218868B2 (en) | 2007-06-13 | 2012-07-10 | Sensors Unlimited, Inc. | Method and apparatus for enhancing images |
| CN106255462A (en) * | 2014-05-16 | 2016-12-21 | 株式会社日立制作所 | Image diagnosing system and half-tone information establishing method |
| CN106412457B (en) * | 2016-10-31 | 2019-03-05 | 维沃移动通信有限公司 | A kind of image processing method and mobile terminal |
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| CN1065566A (en) * | 1991-03-22 | 1992-10-21 | 松下电器产业株式会社 | Video signal gradation corrector |
| JP2000188768A (en) * | 1998-12-22 | 2000-07-04 | Victor Co Of Japan Ltd | Automatic gradation correction method |
| US20040004666A1 (en) * | 2001-08-01 | 2004-01-08 | Chikako Sano | Image pick-up apparatus and image pickup method |
| US20040091139A1 (en) * | 2002-10-18 | 2004-05-13 | Canon Kabushiki Kaisha | Image processing apparatus and method, program, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4123724B2 (en) * | 2001-01-30 | 2008-07-23 | コニカミノルタビジネステクノロジーズ株式会社 | Image processing program, computer-readable recording medium storing image processing program, image processing apparatus, and image processing method |
| JP2003234955A (en) * | 2002-02-12 | 2003-08-22 | Nikon Corp | Image processing device, image processing program, and image processing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065566A (en) * | 1991-03-22 | 1992-10-21 | 松下电器产业株式会社 | Video signal gradation corrector |
| JP2000188768A (en) * | 1998-12-22 | 2000-07-04 | Victor Co Of Japan Ltd | Automatic gradation correction method |
| US20040004666A1 (en) * | 2001-08-01 | 2004-01-08 | Chikako Sano | Image pick-up apparatus and image pickup method |
| US20040091139A1 (en) * | 2002-10-18 | 2004-05-13 | Canon Kabushiki Kaisha | Image processing apparatus and method, program, and storage medium |
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| CN1750603A (en) | 2006-03-22 |
| JP4803982B2 (en) | 2011-10-26 |
| JP2006086610A (en) | 2006-03-30 |
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