WO2003085989A1 - Dispositif de traitement d'images, programme de traitement d'images et procede de traitement d'images - Google Patents
Dispositif de traitement d'images, programme de traitement d'images et procede de traitement d'images Download PDFInfo
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- WO2003085989A1 WO2003085989A1 PCT/JP2003/004327 JP0304327W WO03085989A1 WO 2003085989 A1 WO2003085989 A1 WO 2003085989A1 JP 0304327 W JP0304327 W JP 0304327W WO 03085989 A1 WO03085989 A1 WO 03085989A1
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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
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
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- the present invention relates to an image processing device, an image processing program, and an image processing method.
- the present invention relates to a technique for obtaining information on a photographing light source of image data.
- FIG. 18 is a diagram showing the relationship between “distribution plotted in RB color space” and “color temperature of photographing light source” cited from this document.
- the distribution in the RB color space moves from the R-axis direction to the B-axis direction as the color temperature of the imaging light source rises.
- the estimation method described in the above document estimates the color temperature of the photographic light source based on which color temperature distribution range (the frame shown in Fig. 18 for each color temperature) falls within this RB color space distribution. I have. Disclosure of the invention
- An object of the present invention is to update image data in order to accurately obtain information on a photographing light source. To provide new analysis techniques.
- An image processing apparatus is an image processing apparatus that processes image data including data of a plurality of pixels and obtains information regarding an imaging light source of the image data, and includes a classification unit and a determination unit.
- the classification unit obtains a frequency distribution of the gradation information for each color information section from the color information and the gradation information of the pixel.
- the frequency distribution obtained in this manner is referred to as “gradation distribution for each color”.
- the judgment unit can regard the gradation variation (in other words, gradation variation, gradation diversity, gradation richness, almost continuous). (Gradation width) is evaluated for each color information division unit. Then, the determination unit determines the color information evaluated as having a large number of gradation variations as color information reflecting the influence of the imaging light source.
- the “color information of a pixel” is “information on the color of a pixel” obtained from data of the pixel or the like.
- the determination unit calculates a product of frequencies for a tone distribution in color units, and determines a tone variation based on the value of the product.
- the determination unit evaluates that the color information having a larger value of the product has a larger gradation variation.
- the classification unit includes a space classification unit and a normalization unit as described below.
- the space classification unit obtains a frequency distribution in the color-one-tone space based on the color information and the tone information of the pixel. That is, a frequency distribution of pixels is obtained in a space in which colors and gradations are used as coordinate axes.
- the normalization unit normalizes this frequency distribution for each section of the gradation information to obtain the gradation information. Suppress frequency variations due to differences in report values.
- the classification unit obtains a gradation distribution for each color from the frequency distribution normalized by the normalization unit.
- the normalization unit compensates a small value that does not impair the overall tendency of the frequency distribution, at the time of the normalization, at a position where the frequency is zero in the frequency distribution.
- the image processing apparatus of the present invention performs the following preprocessing in the classification unit. That is, the classification unit extracts a plurality of image areas from the image data, and calculates an average color for each of the image areas.
- the classification unit obtains the above-described gradation distribution in color units for the image region selected by the preprocessing.
- the classification unit and the determination unit execute the above-described processing for each of a plurality of image regions partially extracted from the image data.
- the classification unit obtains a gradation distribution in color units for each of the individual image regions.
- the determination unit obtains color information with many gradation variations for each image region.
- the determination unit calculates a representative value from the “color information with many gradation variations” obtained for each of the image areas, and sets this representative value as color information reflecting the influence of the imaging light source.
- the determination unit performs white balance correction of the image data based on the color information determined to reflect the influence of the imaging light source.
- the determination unit determines that the influence of the imaging light source is reflected.
- White balance correction of image data is performed so that the converted color information is converted to achromatic color.
- An image processing program causes a computer to function as the classification unit and the determination unit according to any one of the above (1) to (7).
- An image processing method is an image processing method for processing image data including data of a plurality of pixels to obtain information on a photographic light source of the image data, and includes a classification step and a determination step.
- the frequency distribution of the gradation information is obtained for each color information section based on the color information and the gradation information of the pixel.
- the gradation variation is evaluated in color units from the gradation distribution in color units, and the color information evaluated as having many gradation variations is determined as color information reflecting the influence of the imaging light source.
- FIG. 1 is a diagram showing a configuration of an electronic camera 11 (including an image processing device).
- FIG. 2 is a flowchart illustrating white balance correction according to the first embodiment.
- Fig. 3 is a graph showing the trajectory of the color information ( ⁇ '/ K') of the achromatic subject while changing the color temperature of the imaging light source.
- FIG. 4 is a diagram created by dithering the image data to show an example of a pattern of the image data.
- FIG. 5 is a distribution diagram in which color information and gradation information for each pixel are plotted on a color-gradation space.
- Figure 6 shows the frequency distribution in the color-one gradation space. .
- FIG. 8 is a graph showing the sum of the frequencies.
- FIG. 9 is a flowchart illustrating white balance correction according to the second embodiment.
- FIG. 10 is a graph showing the product of the frequencies.
- Figure 11 shows the frequency distribution after normalization.
- FIG. 12 is a flowchart illustrating white balance correction according to the third embodiment.
- FIG. 13 is a graph showing the product of the frequencies.
- FIG. 14 is a diagram showing a frequency distribution after normalization.
- FIG. 15 is a flowchart illustrating white balance correction according to the fourth embodiment.
- FIG. 16 is a diagram showing an example of an achromatic color range used for selecting an image area.
- FIG. 17 is a diagram illustrating a result of obtaining color information having many gradation variations in units of image areas.
- FIG. 18 is a diagram showing the relationship between “pixel distribution plotted in RB color space” and “color temperature of imaging light source”.
- the first embodiment is an embodiment corresponding to claims 1, 3, 7, and 9.
- FIG. 1 is a diagram showing a configuration of an electronic camera 11 (including an image processing device).
- a photographing lens 12 is attached to an electronic camera 11.
- the light receiving surface of the image sensor 13 is arranged in the image space of the photographing lens 12.
- the image data generated by the image sensor 13 is digitized via an A / D converter 14 and then temporarily stored in an image memory 15.
- the image processing unit 16 performs image processing such as white balance correction on the image data in the image memory 15.
- the compression recording unit 17 compresses and records the image data on which the image processing has been completed on the recording medium 18.
- the classification unit described in the claims corresponds to “a part for obtaining a gradation distribution in color units from image data” of the image processing unit 16.
- the determining unit described in the claims corresponds to “a part for obtaining color information reflecting the influence of the imaging light source based on the gradation distribution in color units” of the image processing unit 16.
- FIG. 2 is a flowchart illustrating white balance correction according to the first embodiment. Hereinafter, the processing operation of the white balance correction will be described along the step numbers shown in FIG.
- Step S 0 The image processing section 16 acquires RGB data to be used as an estimation material of the light source for photographing from the image data in the image memory 15.
- the image processing unit 16 performs the following standardization to make the signal levels of the RGB data uniform.
- Imax MAX [VR 2 + G 2 + B 2 ] .. '(1)
- Step SI The image processing section 16 calculates color information based on the normalized R'G'B 'component.
- the index value adopted as the color information is preferably a value that has a one-to-one correspondence with the characteristics (eg, color temperature) of the imaging light source. Furthermore, a value that responds sensitively to the difference in the imaging light source is preferable.
- the following color information is employed from the viewpoint of good correspondence with the color temperature.
- Figure 3 shows the data obtained by changing the color information ( ⁇ '/ R') for an achromatic subject while changing the color temperature of the photographic light source.
- the color information ( ⁇ ′ / ⁇ ′) substantially corresponds one-to-one with the color temperature of the imaging light source, and is sensitive to a change in the color temperature of the imaging light source.
- Step S2 Subsequently, the image processing section 16 calculates gradation information based on the R'G '' 'component of each pixel.
- the following gradation information is employed.
- Step S3 The image processing section 16 classifies each pixel on the basis of the color information and gradation information thus obtained, and obtains a frequency distribution as shown in FIG.
- Figure 4 is an example of image data. Since this image data was taken in fine weather, the color temperature of the photographing light source is approximately 600 °.
- the image processing unit 16 calculates the color information and the gradation information by using Expressions 3 and 4 described above.
- FIG. 5 shows a pixel distribution in which the color information and the gradation information are plotted on a color-one gradation space.
- the color-one-tone space here is a space in which colors and gradations are set on coordinate axes.
- the image processing unit 16 provides a plurality of areas on the color-one-tone space.
- the size of these regions may be any size that does not affect the estimation accuracy of the imaging light source practically.
- the shape of the region may be any shape such as a rectangle or a circle.
- an area defined by the following conditional expression is adopted as the plurality of areas.
- Tone division k 1, 2, 3 ⁇ ⁇ ⁇ 1 0
- the image processing unit 16 substitutes the color information and gradation information of each pixel into this conditional expression, and searches for an area where the conditional expression is satisfied (that is, values of the gradation division and the color division satisfying the conditional expression). I do.
- the image processing unit 16 increases the frequency of the area by “1” each time an area where the conditional expression is satisfied is found.
- Step S4 The image processing section 16 normalizes the obtained frequency distribution for each gradation section k.
- the normalization is performed so that the maximum value of the frequency of the gradation section k is “10000”. Such normalization suppresses frequency variation for each gradation section k.
- FIG. 7 is a diagram showing the frequency distribution after such normalization.
- the frequency distribution after the normalization is divided for each color classification, and corresponds to the “gradation distribution for each color” in the first embodiment.
- Step S5 The image processing section 16 calculates the sum of the frequencies for each of these tone distributions in color units. Since the frequency variation for each gradation section k is suppressed in step S4, the sum of the frequencies reflects the degree of gradation variation well. Therefore, the image processing unit 16 determines that the color information having the larger total of the frequencies has more gradation variations and is color information reflecting the influence of the imaging light source.
- FIG. 8 is a graph in which the values of color information are plotted on the horizontal axis and the sum of the frequencies is plotted.
- the color information 2.0 is determined to be the color information that most reflects the influence of the imaging light source. From the correspondence graph shown in FIG. 3, the color temperature of the photographing light source at this time is approximately 690K.
- Step S6 The image processing section 16 obtains a coefficient (white balance correction value) for correcting the color deviation of the image data based on the color information determined to reflect the influence of the imaging light source by referring to a table or the like. . That is, in the case of FIG. 8 described above, the image processing unit 16 obtains a white balance correction value for correcting the color balance of the color temperature of 690 OK.
- Step S7 The image processing section 16 performs white balance correction on the image data in the image memory 15 using the obtained white balance correction value.
- the estimated color temperature 6900 K in the first embodiment is slightly higher than the actual color temperature 600 K.
- this time is blue sky, there was a possibility that it would have been originally estimated to be a higher color temperature. Considering this fact, it can be seen that in the present embodiment, a good estimation result is obtained in which the effect of the large area (blue sky) is appropriately suppressed.
- the present embodiment has a frequency distribution as shown in FIG. Therefore, the frequency distribution S of the blue sky is widely dispersed in the axial direction of the color information, reflecting the subtle color change of the blue sky. Therefore, in the above-described processing, the frequency distribution S of the blue sky is subdivided into color information sections. As a result, in the evaluation for each category of color information, the gradation variation of the blue sky is evaluated to be small. Therefore, in the present embodiment, a good estimation result can be obtained without being distracted by the large-area blue sky.
- the object scene has objects having various reflectances and reflection angles and various shadows.
- the light from the light source is modulated in the light and dark directions by these factors, so that there is a high probability that various gradations will be generated.
- the frequency variation for each gradation section k is suppressed by the normalization processing in step S4.
- the frequency for each gradation varies depending on the pattern of the image data. This variation makes it difficult to determine gradation variations on a uniform scale.
- the frequency variation is reduced by the above-described normalization processing, and the frequencies in the gradation direction are evenly equalized. Therefore, it is easy to determine the gradation variation on a unified scale regardless of the difference in the pattern.
- the second embodiment is an embodiment corresponding to claims 1, 2, 3, 4, 7, and 9.
- FIG. 9 is a flowchart illustrating white balance correction according to the second embodiment. Hereinafter, the processing operation of the white balance correction will be described along the step numbers shown in FIG.
- Step S 0 Processing similar to step S 0 of the first embodiment.
- Step S1 Processing similar to step S1 of the first embodiment.
- Step S2 Processing similar to step S2 of the first embodiment.
- Step S3 Processing similar to step S3 of the first embodiment.
- Step S4 The image processing unit 16 captures a small value that does not impair the overall tendency of the frequency distribution obtained in step S13, at a zero frequency point in the frequency distribution.
- the minimum frequency “1” is uniformly added to the entire frequency distribution (see FIG. 6).
- Step S15 The image processing section 16 normalizes the frequency distribution in the color-one gradation space for each gradation section k.
- normalization is performed so that the maximum value of the frequency in the gradation section k is “10000”. Such normalization suppresses frequency variations for each gradation section k.
- FIG. 11 is a diagram showing the frequency distribution after this normalization.
- the frequency distribution after this normalization is divided for each color classification, which is the “gradation distribution for each color” in the second embodiment.
- Step S16 The image processing section 16 calculates the product of the frequencies for each of the gradation distributions in each color.
- the product of the frequencies well reflects the degree of gradation variation. That is, the image processing unit 16 determines that the color information having a larger product of the frequencies has more gradation variations and is color information reflecting the influence of the imaging light source.
- FIG. 10 is a graph in which the value of the color information is plotted on the horizontal axis. In the case of the graph shown in Fig. 10, the color information is determined to be 1.8 force S, which is the color information that most reflects the influence of the imaging light source. From the correspondence graph shown in FIG. 3, the color temperature of the imaging light source at this time is estimated to be approximately 6200K.
- Step S17 Processing similar to step S6 of the first embodiment.
- Step S18 Processing similar to step S7 of the first embodiment.
- the estimated color temperature 6200 K in the second embodiment is a good estimation result in which the effect of the blue sky is well suppressed.
- Such a good estimation result is a result of estimating the photographing light source using the gradation variation as a scale.
- the product of the frequencies is calculated for the tone distribution of each color, and the tone variation is determined based on the value of the product.
- the difference in gradation variation appears remarkably as the magnitude of the numerical value, it is possible to clearly determine the gradation variation.
- the frequency variation for each gradation section k is suppressed by the normalization processing in step S13. As a result, it is possible to correct a difference in gradation distribution depending on a picture and determine a gradation variation more accurately.
- a portion where the frequency is zero is supplemented by a small value (here, the minimum frequency “1”) that does not impair the overall tendency of the frequency distribution. Therefore, when calculating the product of the frequencies, it is not necessary to bother to eliminate the frequency of zero, and the calculation process can be simplified.
- the third embodiment is an embodiment corresponding to claims 1, 2, 3, 4, 7, and 9.
- FIG. 12 is a flowchart illustrating white balance correction according to the third embodiment. Hereinafter, the processing operation of the white balance correction will be described along the step numbers shown in FIGS.
- Step SS2200 Processing similar to step S10 of the second embodiment.
- Step S2 1 Processing similar to step S11 of the second embodiment.
- Step S2 2 Processing similar to step S12 of the second embodiment.
- Step S2 3 Processing similar to step S13 of the second embodiment.
- Step S2 4 Processing similar to step S14 of the second embodiment.
- Step SS2255 The image processing unit 16 normalizes the frequency distribution of the color-gradation space for each gradation division k. Here, normalization is performed so that the sum of the frequencies in the gradation section k becomes “1 0 0 0”. Such normalization suppresses frequency variations for each gradation section k.
- FIG. 14 is a diagram showing the frequency distribution after this normalization.
- the frequency distribution after the normalization is divided for each color classification, which is the “gradation distribution for each color” in the third embodiment.
- Step S26 The image processing section 16 calculates the product of the frequencies for each of the gradation distributions in each color.
- the product of the frequencies well reflects the degree of gradation variation.
- the image processing unit 16 determines that color information having a larger product of the frequencies has more gradation variations and is color information reflecting the influence of the imaging light source.
- FIG. 13 is a graph in which the product of the frequencies is plotted with the value of the color information as the horizontal axis.
- the color information 1.8 is determined to be the color information that most reflects the influence of the imaging light source. From the correspondence graph shown in FIG. 3, the color temperature of the imaging light source in this case is estimated to be approximately 6200K.
- Step S27 Processing similar to step S17 of the second embodiment.
- Step S28 Processing similar to step S18 of the second embodiment.
- the fourth embodiment is an embodiment corresponding to claims 1 to 7 and 9.
- FIG. 15 is a flowchart illustrating white balance correction according to the fourth embodiment. Hereinafter, the processing operation of the white balance correction will be described along the step numbers shown in FIG.
- Step S31 The image processing section 16 divides the image data in the image memory 15 into a plurality of image areas. For example, image data is divided into 4 parts vertically and six parts horizontally to create 24 image areas. It is preferable to change the section size of the image area here according to the fineness and complexity of the color pattern in the image data. Further, it is preferable to change the position of the dividing line of the image area here according to the positional relationship of the color pattern in the screen.
- Step S32 The image processing section 16 averages the pixel values for each of the image areas for each RGB to obtain an average color.
- Step S33 The image processing section 16 obtains (BZG) and (R / B) from the average color RGB data for each of the image areas.
- the image processing unit 16 determines whether or not the average color falls within a predetermined achromatic color range, using the obtained (B / G) and (R / B) as a scale.
- FIG. 16 is a diagram showing an achromatic color range A (shaded area in FIG. 16) as an example.
- the achromatic range A here is determined as follows.
- a chromaticity space is set using (B_G) and (RZB) as coordinate axes, and the curve of the blackbody locus B is plotted on the chromaticity space.
- This black body locus B Thus, the color temperature is normally limited in advance to the expected color temperature range. That is, the upper limit (for example, 1400 K or more) and the lower limit (for example, 2000 K or less) of the color temperature of the imaging light source are excluded from the blackbody locus B in advance.
- the upper limit for example, 1400 K or more
- the lower limit for example, 2000 K or less
- the specific achromatic color range A is preferably determined based on a subjective test such as whether or not each point in the chromaticity space is close to achromatic.
- the image processing unit 16 determines whether or not each of the average colors obtained in step S32 falls within the achromatic range. From this determination result, the image processing unit 16 selects, from the plurality of image regions, those whose average colors fall within the achromatic range.
- the image areas indicated by numerals in FIG. 17 are the image areas selected in this manner.
- the image area indicated by “1” in FIG. 17 is an image area that was not selected because the average color was out of the achromatic range A.
- the original image in FIG. 17 is an image photographed in an amusement park, and is an image in which chromatic colors unique to the amusement park are locally arranged.
- Step S34 The image processing section 16 counts the number of selected image areas. Here, if the number of selected image areas is equal to or less than the predetermined number and it is determined that the number is too narrow to obtain the color information of the imaging light source, the image processing unit 16 shifts the operation to step S35. I do.
- the image processing unit 16 shifts the operation to step S36.
- Step S35 Here, since the number of selected image areas is small, it is expected that chromatic colors occupy the entire image data.
- the image processing section 16 gives up estimating the photographing light source from the image data, and selects a preset standard white balance correction value (a preset value or the like).
- the image processing unit 16 shifts the operation to step S40 in order to perform adjustment according to the standard white balance correction value.
- Step S36 Here, since the number of selected image areas is larger than the predetermined number, The estimation of the imaging light source is continued. That is, the image processing unit 16 obtains a gradation distribution in color units for each of the selected image areas. Note that details of this processing are the same as those of the first to third embodiments except that the processing is performed for each image area, and a description thereof will be omitted.
- Step S37 The image processing section 16 obtains color information having many gradation variations from the gradation distribution of each color in each of the selected image areas.
- the details of this processing are the same as those of the first to third embodiments, except that the processing is performed for each image area, and thus description thereof will be omitted.
- the numerical value shown for each image area is the (BZR) value of the color information that maximizes the gradation variation in the image area.
- Step S38 The image processing section 16 removes the maximum value and the minimum value from the color information obtained in step S37 as extreme values.
- the image processing unit 16 averages the remaining color information and sets the average as the representative value of the color information.
- the image processing unit 16 determines the representative value of the color information as color information that reflects the influence of the imaging light source.
- the calculation for obtaining the representative value here is not limited to the average calculation.
- a representative value may be obtained by a median operation, a majority operation, or the like.
- the representative value may be obtained by a weighted average calculation in which the weight is changed according to the position of each image area in the screen. In this case, the weight at the center of the screen may be increased, or the weight of the selected part of the focus detection area may be increased.
- Step S39 The image processing section 16 obtains a coefficient (white balance correction value) for correcting the color deviation of the image data based on the representative value of the color information by referring to a table or the like.
- Step S40 The image processing unit 16 performs white balance correction on the image data in the image memory 15 using the obtained white balance correction value.
- the image area in which the average color falls within the achromatic range is set. Estimate the shooting light source by limiting the range to. In this case, since the image area biased to a specific color is previously removed from the image data, there is an advantage that the imaging light source can be accurately estimated without being affected by the specific color.
- the situation of the imaging light source is individually analyzed for each image region, and finally, a representative value is obtained from the individual analysis results.
- the effects of local colors in the screen can be confined to that local image area.
- the influence of local chromatic colors does not spread to the analysis results of other image areas.
- an image processing program (corresponding to claim 8) may be created by converting the above processing operations into program codes.
- the computer can execute the white balance correction of the present embodiment.
- the image processing method according to the present embodiment be provided as a service via a communication line such as the Internet.
- a server such as an image album or a print service can provide image processing services such as the above-described analysis of a photographing light source and white balance adjustment for image data uploaded from a client.
- the gradation variation is determined based on the sum or the product of the frequencies.
- the gradation variation can be determined by obtaining the degree of spread of the gradation distribution of the color unit.
- the gradation variation may be determined from the variance (standard deviation) of the gradation distribution in color units.
- the color information having the largest gradation variation is selected as the color information reflecting the influence of the imaging light source.
- the present invention is not limited to this. For example, by interpolating the gradation variation near the peak and then detecting the peak position, the color information having the largest gradation variation may be accurately obtained. Through such processing, it is possible to accurately determine the difference between the imaging light sources.
- the normalization process is performed after the small value “1” is compensated for the location where the frequency is zero.
- the present invention is not limited to this.
- the processing may be performed in the order of normalization processing and compensation.
- the color information is a color index value, a color scale, or a color characteristic that changes depending on a difference in a light source.
- (B ⁇ R) hue, chromaticity, or chromaticity coordinates may be adopted as the color information.
- the present invention employs a R 2 + 2 as the gradation information.
- Power ⁇ the present invention is not limited to this.
- gradation information when the light of the imaging light source is modulated by the shadow of the object scene, the reflectance, the angle of the irradiation surface, etc., the index value of the gradation that derives various variations and the gradation value It is preferable that the characteristics are scale and gradation characteristics. For example, a luminance value, a color component value, or the like may be employed as the gradation information.
- the photographing light source is estimated using only the gradation variation as a scale.
- the present invention is not limited to this. By combining other estimation techniques with the present invention, it is of course possible to more accurately estimate the imaging light source.
- a gradation variation is obtained for each color, and it is determined that the color information having a larger gradation variation has a stronger influence of the imaging light source.
- the inventors have color information that reflects the influence of the imaging light source has many gradation variations, less color information affected by the imaging light source is c present invention have found that the tone variations limited utilizes this finding As a result, it has become possible to accurately detect color information that reflects the effects of the shooting light source.
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JP2003583033A JP3801177B2 (ja) | 2002-04-04 | 2003-04-04 | 画像処理装置、画像処理プログラム、および画像処理方法 |
AU2003221024A AU2003221024A1 (en) | 2002-04-04 | 2003-04-04 | Image processing device, image processing program, and image processing method |
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JP2007295062A (ja) * | 2006-04-21 | 2007-11-08 | Megachips Lsi Solutions Inc | ホワイトバランス調整方法 |
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2003
- 2003-04-04 JP JP2003583033A patent/JP3801177B2/ja not_active Expired - Lifetime
- 2003-04-04 WO PCT/JP2003/004327 patent/WO2003085989A1/ja active Application Filing
- 2003-04-04 AU AU2003221024A patent/AU2003221024A1/en not_active Abandoned
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JP2000209598A (ja) * | 1999-01-20 | 2000-07-28 | Nikon Corp | ホワイトバランス調整機能を備える電子カメラ |
JP2001112019A (ja) * | 1999-10-04 | 2001-04-20 | Eastman Kodak Japan Ltd | オートホワイトバランス装置及び方法 |
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JP2007295062A (ja) * | 2006-04-21 | 2007-11-08 | Megachips Lsi Solutions Inc | ホワイトバランス調整方法 |
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