WO2004025966A1 - デジタルスチルカメラおよび画像の補正方法 - Google Patents
デジタルスチルカメラおよび画像の補正方法 Download PDFInfo
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- WO2004025966A1 WO2004025966A1 PCT/JP2003/010779 JP0310779W WO2004025966A1 WO 2004025966 A1 WO2004025966 A1 WO 2004025966A1 JP 0310779 W JP0310779 W JP 0310779W WO 2004025966 A1 WO2004025966 A1 WO 2004025966A1
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- image data
- gradation correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6002—Corrections within particular colour systems
- H04N1/6005—Corrections within particular colour systems with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6027—Correction or control of colour gradation or colour contrast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2101/00—Still video cameras
Definitions
- the present invention relates to a method for correcting a digital still camera image.
- a user who has been using a silver halide camera and has become accustomed to its image quality compares a digital still camera image with a photograph taken with the silver halide camera, They tend to prefer “salt camera like” images.
- users who have been familiar with the image quality of TVs and are far from photographic images and still images of silver halide cameras Compared with, they tend to prefer "television-like" image quality.
- a DCF-compliant format is used as an image format when image data is recorded in the flash memory.
- a standard color space is used.
- a certain s RGB color space is adopted.
- This sRGB color space defines the color characteristics such as the gradation characteristics and color gamut (color reproduction range) of a CRT monitor of a personal computer.
- JPEG 2000 which is an extension of the JPEG format used in DCF, and a color space that can cover a wider color reproduction range that can be perceived by humans are also being studied.
- the sc RGB color space scene reference color space
- Color-corrected color spaces output reference color spaces
- output reference color spaces are being standardized internationally.
- the captured color image is recorded and stored in the flash memory as a single image in an image format conforming to DCF, so that the quality of various users is reduced. You cannot save it to your satisfaction.
- the photographed image may be a so-called photographing failure image.
- the image data may be a digital image, and there is a great need for correction after shooting.
- the image data that can be used by the user for correction is data that has undergone processing such as JPEG compression in a digital still camera, and the amount of information contained in the image data is the actual shooting scene. Since the amount of information is smaller than the amount of information of the user, it may not always be possible to sufficiently correct the image quality preferred by a user, especially a high-end user.
- the present invention enables a user to correct a photographed image to an appropriate or desired image and execute the correction in a digital still camera. It is something to do. Disclosure of the invention
- a memory for holding image data of an image to be subjected to gradation correction in a standard color space format
- a gradation correction circuit reads out the image data stored in the memory from the memory
- the gradation correction circuit executes the gradation correction on the read image data.
- FIG. 1 is a system diagram showing one embodiment of a photographing system according to the present invention.
- FIG. 2 is a system diagram showing an embodiment of a monitor system according to the present invention.
- FIG. 3 is a system diagram showing one form of a main part of the monitor system.
- Fig. 4 is a system diagram showing one form of the main part of the monitor system.
- Fig. 5 is a diagram for explaining an example of GUI operation of the monitor system.
- FIG. 6 is a diagram for explaining an example of a GUI operation of the monitor system.
- Fig. 7 is a system diagram showing one form of the main part of the monitor system.
- Fig. 8 is a characteristic diagram showing the characteristics of the main parts of the monitor system.
- Fig. 9 is a diagram for explaining the category classification of captured images
- FIG. 10 is a diagram showing an algorithm of a main part of the monitor system.
- FIG. 11 is a diagram showing an algorithm of a main part of the monitor system.
- FIG. 12 is a characteristic diagram showing characteristics of a main part of the monitor system.
- 13 is a characteristic diagram showing characteristics of main parts of the monitor system.
- FIG. 14 is a characteristic diagram showing characteristics of main parts of the monitor system.
- FIG. 15 shows the parameters of the monitor system.
- 16 is a diagram showing an algorithm of a main part of the monitor system.
- FIG. 17 shows an algorithm of a main part of the monitor system.
- 18 is a characteristic diagram showing characteristics of main parts of the monitor system.
- FIG. 19 shows an algorithm of a main part of the monitor system.
- 20 is a diagram showing an algorithm of a main part of the monitor system.
- 22 is a diagram showing a mathematical expression.
- FIG. 24 is a diagram showing a mathematical expression.
- FIG. 25 is a diagram showing mathematical formulas.
- FIG. 26 is a diagram showing mathematical formulas. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows an example of a photographing system when the present invention is applied to a single-chip digital still camera. That is, an image of the object OBJ is projected onto the CCD image sensor 11 by the imaging lens LNS, and the CCD image sensor 11 outputs image data R 1, G 1, and 16 bits linear three primary colors. B1 is extracted, and the image data R1, G1, and B1 are supplied to a demosaicing processing circuit 12 and demodulated into image data for each pixel, and then AWB processing is performed. AWB processing is performed by the circuit 13 to obtain image data R'2 and G'2B'2.
- the image data R′2, G′2, and B′2 are supplied to the scRGB data creation circuit 14, and the image data RscRGB of the 16-bit linear scRGB format is provided.
- G scRGB, B scRGB, and the image data R scRGB, G scRGB, B sc RGB are stored in the RAM 15 once.
- the stored image data R scRGB, G scRGB, and B scRGB are supplied to a gamma correction circuit 16 to be gamma-corrected, and are converted into 8-bit X 3-color image data R, G, and B.
- the image data R, G, and B are written and stored in a nonvolatile memory means, for example, a flash memory 20 by a write / read circuit 19.
- the flash memory 20 is detachable from the digital still camera.
- the image data R, G, and B from the gamma correction circuit 16 are supplied to the matrix operation circuit 17 and the YCC format image data, that is, the luminance data Y and
- the image data Y, Cb, and Cr are converted into blue and red color difference data Cb and Cr, and are written and stored in the flash memory 20 by the write / read circuit 19.
- image data R, G, B or Y, Cb, Cr are stored in flash memory 20 for compatibility with conventional digital still cameras and “image correction and processing software”. It is stored in And in this invention, it is further comprised as follows.
- the image data R scRGB, G scRGB, and B scRGB stored in the RAMI 5 remain unchanged, that is, the 16-bit linear image data is written and read out by the write / read circuit 19 to the flash memory 2. Written to 0 and saved.
- the image data R scRGB, G scRGB, and B scRGB are supplied to the sc YCCZ sc RGB conversion circuit 18 and the image data in the 12-bit non-linear sc YCC format Y scYCC, C b scYC C
- the image data Y scYCC and C b scYC C r scYCC are converted into r scYCC, and are written and stored in the flash memory 20 by the write / read circuit 19.
- the above is the signal processing at the time of photographing.
- sc RGB format image data creation circuit 14 (2. Example of sc RGB format image data creation circuit)
- the image data R'2, G'2, and B'2 after AWB correction are 16-bit linear.
- sc RGB The converted image data is converted into R scRGB, G scRGB, and B scRGB, which is realized by the following processing, for example. That is,
- Equation 1 the image data X raw, Y raw, and Z raw are calculated for each pixel from the AWB-corrected image data R'2, G'2, and B'2. .
- the average value Yraw-ave of the image data Yraw at all the pixels of the image or the pixels sampled appropriately is calculated, and a value, for example, five times the average value Yraw_ave is set to the white level.
- the image data X raw and Y raw Z raw for each pixel are normalized according to equation 2 shown in Fig. 21 to obtain the normalized image data X r aw_n, Y raw — get n, Z ra _n.
- the inverse of the matrix Ml is calculated using the normalized image data X raw—n, Y raw_n, and Z raw—n found in (2). Multiply and calculate the image data R'3, G'3, B'3 for each pixel.
- Equation 4 shown in Fig. 21 the 16-bit linear sc RGB format image for each pixel is obtained from the image data R'3, G'3, and B'3 obtained in (3). Create data R scRGB, G scRGB, B scRGB.
- the image data R scRGB, G scRGB, and B sc RGB are image data of the desired sc RGB format, they are taken out from the sc RGB data creation circuit 14 and stored in the RAMI 5. (3. example of sc YCCZ sc RGB conversion circuit 18)
- the image data is converted from R scRGB, G scRGB, B scRGB power, and sc RGB format to sc YCC format. This is achieved by: That is,
- the image data of the 16-bit linear sc RGB format can be converted from R scRGB, G scRGB, and B scRGB to a non-linear image.
- Equations 7 and 8 shown in Figure 22 the non-linear scRGB format image data R 'scRGB, G' scRGB, B 'scRGB is converted to the sc YCC format image data. Convert to Y scYCC, C b scYCC, Cr scYCC.
- the image data Y scYC C b scYC C r scYCC is the target scYCC format image data, it is stored in the flash memory 20 by the write / read circuit 19.
- FIG. 2 shows an example in which the present invention is applied to a circuit for correcting a captured image. That is, the write / read circuit 19 reads out the flash memory 20 image data R scRGB, G scRGB, and B scRGB in the scRGB format, and reads this data R scRGB ⁇ B scRGB is written to RAMI 5.
- image data in sc YCC format Y scYCC, C b scYCC, C from flash memory 20 by write / read circuit 19 r scYCC is read out, and the data Y scYCC, C b scYCC, and C rs cYCC are supplied to the sc YCC / sc RGB conversion circuit 18 and the image data of the sc RGB format R scRGB, G scRGB, B scRG
- the image data is converted to B, and the image data R scRGB, G scRGB, and B scRGB are written to RAMI5.
- Image data 1 ⁇ 3 1 ⁇ 8 GscRGB, BscRGB written to ⁇ 15 are supplied to the display, for example, LCD 32, through the monitor display processing circuit 31 and displayed as a color image. Is performed. .
- the white balance is automatically adjusted by the AWB processing circuit 13 when the image is stored in the flash memory 20 during shooting, but the AWB fine adjustment circuit 33 is provided.
- the AWB fine adjustment circuit 33 processes the image data of the RAMI 5 and finely adjusts the white balance of the color image displayed on the LCD 32.
- the sc YCCZ sc RGB converter 18 converts the image data R scRGB, G scRGB, and B scRGB in the RAM 15 into 12-bit non-linear image data in the sc YCC format Y scYCC, C b Converted to scYCC, Cr scYCC and written to RAM34.
- the image data YscYC, CbscYCC, and CrscYCC of the RAM 34 are corrected by the gradation correction circuit 35 according to the GUI operation of the user, and the image data of the correction result is obtained. Is converted into an RGB format signal by the monitor display processing circuit 31 and supplied to the LCD 32, where it is displayed as a color image.
- the image data whose gradation has been corrected by the gradation correction circuit 35 is written to and read from the flash memory 2 through the read / write circuit 19. Written to 0 and saved.
- the sc RGB format image data R scRGB, G scRGB, and B sc RGB written in RAMI 5 have less white balance than the white information at the time of shooting stored in the digital still camera. Adjusted. This is achieved by the following processing.
- Equation 12 the corrected white point tristimulus values X w ′, Y w ′ are calculated using the inverse matrix of matrix M 1 used in Equation 1.
- the linear RGB values R'w, G'w, Bw 'for displaying on the s RGB monitor are obtained from Zw'. ⁇
- sc RGB format read from RAMI 5 image data R scRGB, G scRGB, B scRGB
- the white balance adjustment coefficients kr, kg, and kb obtained in section (7) are integrated, and the corrected scRGB format image data R scRGB—W, GscRGB_W, and BscRGB—W are calculated. I do.
- the calculated image data R scR GB—W, G scRGB—W, and B scRGB—W are written back to R AMI 5 as a fine adjustment result.
- the image data in the flash memory 20 is 16-bit linear image data R scRGB, G scRGB, or B scRGB in the sc RGB format, the items (6) in 5-1-1 shall be used. Make the same correction.
- the image data in the flash memory 20 is a 12-bit non-linear sc YCC format image data Y scYCC or C b scY CC r scYCC
- the image data is used.
- Y scYC C b scYCC, C r scYCC is converted to image data R scRGB, G scRGB, B scRGB in 16-bit linear sc RGB format by sc YCC / sc RGB conversion circuit 18 and similar. Make corrections.
- the image data R scRGB, G scRGB, and B scRGB of the mat are converted to image data in RGB format by the sc RGB / RGB conversion processing unit 311 of the monitor display processing circuit 31 and converted to the LCD 3 2 And is displayed as a blank image.
- the conversion of sc RGB format to RGB format is described below in detail.
- image data R scRGB, G scRGB, and B scRGB in a 16-bit linear sc RGB format are converted to image data R 'scRGB in a non-linear sc RGB format.
- G 'scRGB, B' scRGB are converted to image data R 'scRGB in a non-linear sc RGB format.
- the image data obtained in the section (1) is converted into 8-bit non-linear RGB data R, G, and B.
- FIG. 5 shows the rear surface of the above-described digital still camera, and the rear surface includes an LCD 32, a menu button 41, a decision button 42, a cursor button 43 in the vertical and horizontal directions. Is arranged.
- Figure 6 shows an example of GUI operation when correcting gradation. That is,
- the characters “Adjust”, “Automatic”, “TV”, and “Photo” are superimposed on the image displayed in the section (1). These characters can be selected by the cursor button 43 and the decision button 42, but "adjustment” is for the user to manually perform the correction described below. If you select “TV”, the image quality is corrected to TV-like image quality, and if you select “Photo”, the image quality is corrected to silver halide camera-like image quality.
- the LCD 32 further displays slide bars 45 and 46, and the user operates the power sol.
- the slide bar 45 is moved in the left and right direction, the contrast of the bright part of the image is corrected one step higher or lower each time the slide bar 45 moves one pitch.
- the slide bar 46 is moved in the left and right direction, the contrast of the dark portion of the image is corrected one step higher or lower each time the slider 46 moves one pitch.
- FIG. 7 shows an example of the gradation correction circuit 35.
- this floor The outline of the tone correction circuit 35 will be described, and details of each unit will be described later.
- the luminance data Y scYCC is supplied to the gradation correcting section 351, and the gradation is corrected and output.
- the color difference data C b scYCC and Cr scYCC are supplied to the saturation correction section 352, where the saturation is corrected and output.
- these output image data Y scYCC, C b scYCC, and Cr scYCC are supplied to the LCD 32 and displayed as a single image, and are also stored in the flash memory. It is supplied and stored in the file 20.
- the luminance data Y scYCC is sequentially supplied to the luminance signal histogram calculation section 353, the image information extraction section 354, and the image power categorization section 355, and, for example, 10 kinds of images are obtained. It is classified into one of the categories. Then, using the classification result, the black-and-white level correction curve creation section 356, the gradation correction curve creation section 357, and the gradation correction parameter selection section 369 form the gradation correction section 3.
- the gradation correction characteristic of 51 is determined.
- the saturation correction curve creation unit 358 and the saturation correction parameter selection unit 368 use the saturation correction characteristics of the saturation correction unit 352. Is determined.
- the ROM 369 has various parameters and thresholds. The processing contents of each part are as follows.
- the luminance signal histogram calculation unit 353 is supplied with the luminance data YscYCC of the image to be subjected to the gradation correction from the RAM 34. Then, the luminance signal histogram calculating section 353, as shown in FIG. A cumulative histogram f (Y) of the luminance signal Y is created from the luminance data Y scYCC of.
- the cumulative histogram f (Y) of the luminance signal Y created by the luminance signal histogram calculation unit 353 is supplied to the image information extraction unit 354. Then, as shown in FIG. 8, the image information extracting unit 354 outputs the data of the cumulative histogram f (Y) as p 1%, p 2%,..., Pn% of the entire data. (For example, 5%, 10%,..., 95%), the values ⁇ ⁇ 1, ⁇ 2,..., ⁇ of the luminance signal Y are calculated. The values ⁇ 1 to ⁇ indicate the brightness of the image.
- the image categorizing unit 355 uses the image information ⁇ 1 to ⁇ created by the image information extracting unit 355 to classify the images into 12 categories as shown in FIG. For this reason, the image categorizing unit 355 performs categorization by an algorithm as shown in FIG. 10, for example. That is,
- the image to be corrected by the user is classified into any one of ten categories including the U-shaped histogram.
- the shooting information or GUI input for image correction If there is, two categories of “night scene” and “snow scene color” are added as shown on the right side of FIG. 9 by the GUI input, and a total of 12 category classifications are performed.
- the image data of the images classified by the image categorizing unit 355 is supplied to a black-and-white level correction force generating unit 356 as shown in FIG.
- the black-and-white level correction curve creating section 356 is mainly for increasing insufficient contrast caused by the exposure state at the time of shooting.
- FIG. And has an S-shaped characteristic as shown in Fig. 12.
- the luminance value Y min and the luminance value are set so that the luminance value Y min of the black level of the image approaches 0 and the luminance value Y max of the white level of the image approaches 1.0.
- Equation 19 see Fig.
- the luminance values Y min and Ymax are usually determined as points corresponding to both ends of the histogram distribution from the luminance signal value Y which takes a value appropriately determined from the cumulative histogram value.
- the level Y min on the black side is limited by setting an appropriate threshold Y TH to prevent overcompensation.
- the histogram of night view has a feature that the gradation is biased toward lower gradation, while the area of street lamps etc. is relatively small but high. In many cases, objects with brightness are included. In that case, as shown in the histogram of the night view in FIG. 9, a certain amount of pixels is distributed near the maximum value of the gradation. For this reason, the brightness in normal black and white level correction In the method of determining the degree value Ymax, the correction effect on the white side is not sufficiently obtained.
- the white correction level for the night view is set to a value slightly smaller than the luminance value Y max set by the normal method.
- a high-luminance portion such as a luminous body, for example, a streetlight, is shifted in a brighter direction, so that an effect of enhancing the brightness can be provided.
- the brightness value detected from the cumulative histogram will be low, and the correction amount for approaching white (1.0) will be too large. Since the halfway point between the detected luminance value and white (1.0) is used as the white correction level Y max, the correction amount is prevented from becoming too large, and the scene of the night view was originally used. It does not impair the darkness it has.
- the black correction level Y min is set to a value smaller than the value Y min obtained by the normal method. Also fixed to a low value The effect is to surely darken the lower gradation part of the shadow part.
- the generation of the inverted S-shaped curve uses the inflection point ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ and the curvature rr as parameters.
- the ROM 369 of FIG. 7 stores the parameters of the inflection point X 0 and the curvature rr for all 12 categories, and the parameters kc for saturation described later.
- Table Be prepared.
- the parameter value ⁇ takes a value of 0.4 to 8
- the parameter value rr takes a value of 1.0 to 10.
- the gradation correction parameter overnight selecting section 3657 based on the categorization information of the image output from the image categorizing section 365, converts the table shown in FIG. Referring to the corresponding parameters, the gradation correction curve creation unit 357 uses the parameters selected by the gradation correction parameter selection unit 366 as shown in FIG. Create a gradation correction inverse S-shaped curve.
- the tone correction parameter overnight selection unit 3667 includes the tone correction inverse S-shaped curve and the black-and-white level corrected S-shaped curve created by the black-and-white level correction curve creation unit 365 (Fig. 1). 2) is combined to create a brightness signal value correction conversion table.
- the gradation correction unit 351 converts the luminance image data read from the RAM 34 into FIG. As shown, the value Y in is converted to the value Y 0 ut and output.
- the saturation of the medium to high saturation part may be lost. Therefore, a correction process for maintaining the saturation is performed simultaneously with the gradation correction.
- This saturation correction is performed on the chroma value C based on the color difference data Cb and Cr. Basically, using the equation 21 shown in FIG. 25, the color difference data Cb, The saturation is enhanced by controlling the gain coefficient kc for C r.
- the ROM 369 in FIG. thus, a table of parameters of the gain coefficient kc for all 12 categories is prepared.
- the parameter kc takes a value of 1.0 to 2.0.
- the saturation correction parameter selection unit 3668 determines whether the table shown in FIG. 15 is available based on the categorization information of the image output from the image categorizing unit 365. Then, the corresponding parameter kc is selected, and the saturation correction curve creation unit 358 is based on the straight line according to Equation 21 based on the parameter selected by the saturation correction parameter selection unit 368. Then, a correction force curve is created as shown by the solid line in Fig. 18.
- an appropriate threshold value is set for the correction curve in Fig. 18 and an S-shaped function as shown in equation 19 is used. Performs saturation suppression.
- the high-saturation section uses a Hermite curve to prevent the value amplified by saturation enhancement from clipping. Using this saturation correction curve, a correction conversion table for the saturation data Cb and Cr is created.
- the saturation correction section 352 uses the saturation correction table generated by the saturation correction curve creation section 358, and uses the saturation data C b read from the RAM 34. , Cr and output.
- the white by the S-curve is used.
- these corrections are based on the correction amount at the time of the normal automatic correction, and the correction amount that finely adjusts the black-and-white level correction amount using the S-shaped curve and the saturation correction amount using the gain coefficient. I do.
- Television images (or images on a CRT monitor) generally have high average brightness, high contrast (sufficient black level, sufficient white level), and high saturation. Therefore, when a TV-like image is to be obtained by performing image quality correction of “TV”, correction shall be made with these points in mind.
- the black level Y min — TV in this mode is set by the equation 22 shown in FIG. 25 from the black level Y min obtained by normal automatic correction.
- the value B K tv is set to 0.7 to 1.0.
- the white level Ymax-TV in this mode is set by the equation 23 shown in Fig. 26 using the white level Ymax determined by normal automatic correction.
- the value W tv is set to 0.8 to 1.0.
- the black level Y min_TV and the white level Y max- TV are converted to a polygonal line, similar to the method of creating a black-and-white level correction curve for “automatic” correction (Fig. 12).
- the parameter inflection point X 0 and the curvature rr of the approximated S-shaped function (Equation 19) are obtained by the S-shaped parameter calculator (see Fig. 19).
- the corrected image has a high average luminance and is a high-contrast image.
- the gain coefficient k c —T V for saturation correction is obtained from the gain coefficient k c set by the image categorization information according to equation 24 shown in FIG.
- the value GtV is set to 1.0 to 1.2.
- the above processing is executed by the user selection correction unit of the saturation correction curve generation unit 358 in FIG. 20, and thereafter, the same processing as the saturation correction curve generation method in the “automatic” correction is performed. , Create a correction curve.
- the picture quality is generally high contrast, but its average brightness is lower than that of television pictures. Therefore, when a “photograph” is corrected to obtain a silver halide camera-like image quality, the correction should be made with this point in mind. 6-4-2-1 Black and white level correction
- the black level is the same as the black-and-white level correction in “automatic” of 6 — 3 — 4 — 1, and the white level Y max determined by “automatic” according to equation 25 shown in FIG. Use to set the white level Y max—Pic.
- the value Wpic is set to 0.8 to 1.0.
- the corrected image is a high-contrast image that retains halftones.
- a gain coefficient kc_pic for saturation correction is obtained from a gain coefficient kc set by the image categorization information.
- the value G pic is set to 1.0 to 1.2.
- the black level value Y min-User of the image is corrected according to the adjustment slide bar 46 of the dark contrast.
- the black level Y min_User is set by the equation 27 shown in Fig. 26 from the black level Y min in the “automatic” black-and-white level correction of 6-3-4-1.
- the value BK user ranges from 0.85 to 1 ⁇ 15, and is calculated from 0.85 (minimum dark contrast) to 1.15 (dark contrast) in 0.05 steps using the slide bar 46. Correction is possible up to the maximum).
- the white level Ymax—User of the image is corrected according to the adjustment slide bar 45 of the bright contrast.
- the white level Ymax—User sets the white level Ymax power in the “automatic” black-and-white level correction of 6—3—4—1 according to equation 28 shown in Figure 26.
- the black level Y min—User and the white level Y max—U ser were connected with a straight line, as in the method for creating the black and white level correction curve for “automatic” correction (Fig. 12).
- the parameter inflection point ⁇ and curvature rr of the S-shaped function (Equation 19) approximated to the polygonal line are obtained by the S-shaped parameter overnight calculator (see Fig. 19).
- the gain coefficient kc_User for the saturation correction by the user is obtained from the gain coefficient kc set by the image categorization information by the equation 29 shown in FIG.
- the value G user is 0.85- "1.15
- the value BK user W user changes according to the adjustments of the light and dark portions of the black and white level correction 45 and 46. It is determined as in Equation 30 shown in 26.
- the processing described above is executed by the user selection correction unit of the saturation correction curve generation unit 358 in FIG. 20, and thereafter, the same processing as the saturation correction carp generation method in the “automatic” correction is performed. , Create a correction curve.
- the image in each of the above-mentioned correction processing is 8-bit data by the YCbCr / RGB conversion processing unit 312 in the monitor display processing circuit 31. Converted to a non-linear RGB format signal and converted to LC Supplied to D32 and displayed as an image.
- the conversion in this YCbCrZRGB conversion circuit is performed by the matrix operation of Expression 31 shown in FIG.
- M3-1 is the inverse matrix of the matrix used in Equation 7.
- the RAM 15 for storing the image data in the scene reference color space format that is, the image data in the 16-bit linear sc RGB format is provided in the digital still camera, No- Even without a sonar computer or “image correction and processing software,” users can adjust the white balance of images on the spot with a digital still camera after shooting.
- the user can correct the gradation and saturation of the image on the spot after shooting by using only a digital still camera.
- the RAMI 5 Since the RAMI 5 is provided, even if an image is shot with another digital still camera, the image data can be copied to the flash memory 20 to make it white. The balance can be adjusted.
- the demosaicing processing circuit 12 is unnecessary.
- the flash memory 20 can be a detachable and independent memory force such as a memory stick (registered trademark).
- the image data stored in the flash memory 20 can be output to an external device such as a personal computer or a printer via a USB or the like.
- a W B Auto Wite Balance
- CCD Charge Cou led Device CRT Cathode Ray Tube
- the memory for storing the image data of the scene reference color space format is provided in the digital still camera, the user can use the digital still camera only on the spot after shooting to take the image. You can adjust or correct the white balance, gradation and saturation of the image. In addition, it is possible to correct the white balance, gradation, and saturation of an image captured by another digital still camera.
- the gradation and saturation are automatically corrected based on the statistical analysis of the image, the quality of various types of captured images can be improved with a high probability. Further, since the gradation correction uses a correction curve based on a combination of the S-shaped function and the inverse S-shaped function, it is possible to perform the correction in each of the bright and dark portions of the image independently to some extent.
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US12/491,585 US8358355B2 (en) | 2002-09-10 | 2009-06-25 | Digital still camera and image correction method |
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EP (1) | EP1549082A1 (ja) |
JP (1) | JP3888456B2 (ja) |
KR (1) | KR20050042185A (ja) |
CN (1) | CN1689340A (ja) |
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TWI238649B (en) | 2005-08-21 |
US7580064B2 (en) | 2009-08-25 |
US20090303345A1 (en) | 2009-12-10 |
US8358355B2 (en) | 2013-01-22 |
TW200405717A (en) | 2004-04-01 |
KR20050042185A (ko) | 2005-05-04 |
JP2004104464A (ja) | 2004-04-02 |
EP1549082A1 (en) | 2005-06-29 |
JP3888456B2 (ja) | 2007-03-07 |
US20060119713A1 (en) | 2006-06-08 |
CN1689340A (zh) | 2005-10-26 |
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