WO2004114678A1 - 画像処理システム及び画像処理方法 - Google Patents
画像処理システム及び画像処理方法 Download PDFInfo
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- WO2004114678A1 WO2004114678A1 PCT/JP2004/009264 JP2004009264W WO2004114678A1 WO 2004114678 A1 WO2004114678 A1 WO 2004114678A1 JP 2004009264 W JP2004009264 W JP 2004009264W WO 2004114678 A1 WO2004114678 A1 WO 2004114678A1
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- saturation enhancement
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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
- H04N1/6083—Colour correction or control controlled by factors external to the apparatus
- H04N1/6086—Colour correction or control controlled by factors external to the apparatus by scene illuminant, i.e. conditions at the time of picture capture, e.g. flash, optical filter used, evening, cloud, daylight, artificial lighting, white point measurement, colour temperature
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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
-
- 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
Definitions
- the present invention relates to an image processing system and an image processing method.
- image processing is often performed automatically to enhance the saturation.
- image processing is automatically performed inside the camera to output a processed image, while almost unprocessed images are output from the camera.
- it is read by a computer, automatically processed, and displayed on the screen.
- the simplest way to emphasize saturation is to simply multiply it by a fixed coefficient, but in all cases the same processing may cause inconvenience.
- noise may appear on the image depending on the shooting conditions.
- saturation is applied with a large amount of enhancement, the noise will also be enhanced at the same time, and the appearance will worsen.
- the emphasis is placed on the low-saturation area, and another mixed color is emphasized to prevent it from becoming a unique area. I have.
- the first issues are as follows. That is, the conventional example does not particularly consider the noise characteristics of the imaging system.
- the noise generated by the imaging element and the analog circuit associated with it has characteristics close to the white noise characteristics, but the level is R
- Another object of the present invention is to provide an image processing system and an image processing method capable of effectively enhancing the saturation without deteriorating the appearance by expanding the hue shift of the entire image when the white balance is shifted. It is to provide a processing method.
- a first aspect of the present invention is an image processing system capable of enhancing the saturation of an image, and performs color saturation according to a sensitivity setting at the time of shooting.
- a coefficient determining unit that determines a saturation enhancement coefficient
- a coefficient application unit that performs a saturation enhancement process on an image signal using the saturation enhancement coefficient determined by the coefficient determination unit.
- the aspect of the whistle 2 of the present invention relates to the image processing system according to the first aspect of the present invention, wherein the coefficient determination unit has a small saturation when the set value of the sensitivity HX at the time of shadowing is large.
- a third aspect of the present invention relates to an image processing system capable of performing strong IRJ on the saturation of an image, and a coefficient for determining a saturation enhancement coefficient according to a white balance coefficient at the time of shooting.
- a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation enhancement coefficient determined by the determination unit and the coefficient determination unit of # 11 ;
- a fourth aspect of the present invention relates to the image processing system according to the third aspect of the present invention, wherein the coefficient determination unit has a large white noise coefficient at the time of s3 shadowing. If so, set a small saturation emphasis coefficient.
- a fifth aspect of the present invention is an image processing system capable of enhancing the saturation of an image, wherein the saturation enhancement coefficient is determined according to the reliability of the white balance at the time of shooting.
- a sixth aspect of the present invention relates to the image processing system according to the fifth aspect of the present invention.
- an image processing system capable of enhancing the saturation of an image, comprising: a white balance that determines the reliability of white noise based on an image signal.
- a determining unit a coefficient determining unit that determines a saturation enhancement coefficient according to the reliability of the white balance determined by the white balance determination unit; and a saturation enhancement coefficient determined by the coefficient determination unit.
- a coefficient application unit for performing a saturation enhancement process on the image signal.
- An eighth aspect of the present invention is an image processing method capable of enhancing the saturation of an image.
- Coefficient application that performs chroma enhancement processing on the image signal using the five-saturation p-coefficients determined in the coefficient determination step that determines the saturation enhancement coefficient according to the loss constant and the coefficient determination step in step ⁇ And a process.
- an image processing method capable of enhancing the saturation of an image, comprising: a coefficient determining step of determining a saturation enhancement coefficient according to a white balance coefficient at the time of shooting. And a coefficient application step of performing a saturation enhancement process on the image signal using the saturation enhancement coefficient determined in the coefficient determination step.
- a tenth aspect of the present invention relates to an image processing method capable of enhancing the saturation of an image, the image processing method comprising: A coefficient determining step of determining a saturation enhancement coefficient according to the reliability of the image, and a coefficient application step of performing a saturation enhancement process on an image signal using the saturation enhancement coefficient determined in the coefficient determination step. I do.
- the eleventh aspect of the present invention is an image processing method capable of enhancing the saturation of an image, wherein the image processing method determines a reliability of a white balance based on an image signal.
- a 12th aspect of the present invention relates to an image processing system capable of enhancing the saturation of an image, wherein a coefficient for determining a saturation enhancement coefficient in accordance with a gain for a current image signal is provided. And a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation intensity IBJ coefficient determined by the coefficient determination unit.
- a thirteenth aspect of the present invention relates to the image processing system according to the twelfth aspect of the present invention, wherein the coefficient determination unit is configured to determine whether the gain for the image signal at the time of shooting is large. , Set a small saturation enhancement coefficient ⁇
- a fourteenth aspect of the present invention relates to the image processing system according to any one of the fifth to seventh aspects of the present invention, wherein the reliability of the white balance is determined by a color signal of a white balance coefficient. It is determined according to the positional relationship between the position in the signal space and the specified region representing the achromatic color in the color signal space.
- a fifteenth aspect of the present invention relates to the image processing system according to the fourteenth aspect of the present invention, wherein a distance between the position of the white balance coefficient and the predetermined area is set. The smaller the value, the greater the reliability.
- a sixteenth aspect of the present invention relates to the image processing system according to the fourteenth aspect of the present invention, wherein the predetermined area is a position of a signal corresponding to an illumination light source in the color signal space. It is a region that includes.
- a seventeenth aspect of the present invention relates to the image processing system according to the fourteenth aspect of the present invention, wherein the predetermined area is an area including a blackbody radiation locus in the color signal space. It is.
- An eighteenth aspect of the present invention relates to the image processing system according to the tenth or eleventh aspect of the present invention, wherein the reliability of the white balance is determined by a white balance coefficient. It is determined according to the positional relationship between the position in the color signal space and a predetermined region representing an achromatic color in the color signal space.
- a nineteenth aspect of the present invention relates to the image processing system according to the eighteenth aspect of the present invention, wherein a distance between the position of the white balance coefficient and the predetermined area is small. The higher the reliability, the higher the reliability.
- a 20th aspect of the present invention relates to the image processing system according to the 18th aspect of the present invention, wherein the predetermined area is a position of a signal corresponding to an illumination light source in the color signal space. Including territory Area.
- a twenty-first aspect of the present invention relates to the image processing system according to the eighteenth aspect of the present invention, wherein the predetermined area is an area including a blackbody radiation locus in the color signal space. is there.
- FIG. 1 is a diagram showing a configuration of an image processing system according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing an example of the configuration of the saturation emphasizing unit 107 of FIG. 1.
- FIG. 3 is a diagram showing the change of the noise amount with respect to the ⁇ signal value level.
- FIG. 3 is a diagram professionally prepared according to SO sensitivity.
- FIG. 4 is a diagram showing a tapenette used for determining a saturation enhancement coefficient in the first embodiment of the present invention.
- FIG. 5 is a diagram for describing a modification of the first embodiment.
- FIG. 6A is a diagram illustrating a tape insert used for determining a saturation enhancement coefficient in a modification of the first embodiment.
- FIG. 7 is a diagram showing a template used for determining a saturation enhancement coefficient in the second embodiment of the present invention.
- Fig. 8A ⁇ is a diagram for explaining WB shift and saturation enhancement
- FIG. 9 is a diagram showing a table used for determining a saturation enhancement coefficient according to the third embodiment of the present invention.
- FIG. 10 is a diagram for explaining W ⁇ .
- FIG. 11 shows a saturation enhancement coefficient according to the fourth embodiment of the present invention.
- FIG. 6 is a diagram showing a table used for determination of.
- FIG. 12 is a diagram showing a configuration of an image processing system according to the fifth embodiment of the present invention.
- FIG. 13 is a diagram showing a table used for determining a saturation enhancement coefficient in the fifth embodiment of the present invention.
- FIG. 14 is a diagram for describing the software processing for saturation enhancement.
- FIG. 1 is a diagram showing a configuration of an image processing system according to a first embodiment of the present invention.
- An image pickup system 101 for picking up an object has an image pickup system 101 with respect to an image from the image pickup system 101.
- a post-processing unit 109 that performs post-processing such as compression on the output from 08 is connected in order.
- An output signal from the post-processing unit 109 is supplied to a recording system (not shown).
- the image buffer 103 is also connected to the photometry evaluation unit 110, and the photometry evaluation unit 110 is connected to the imaging system 101.
- the initial signal processing unit 102 and the WB processing unit 104 are bidirectionally connected to a control unit 121 such as a micro computer.
- the signal from the control unit 121 is also sent to the saturation emphasis unit 107.
- power supply External IZF unit with interface for switching between switch, shutter button, and various modes during shooting 1
- the shutter button is pressed halfway through the external IZF section 122 to pre-imaging mode. to go into.
- the image signal captured by the imaging system 101 is read out as an analog signal by the initial signal processing unit 102, amplified, then converted into a digital signal, and the image buffer 1 0 is transferred to 3.
- the image signal in the image buffer 103 is transferred to the photometric evaluation unit 110.
- the metering evaluation unit 110 calculates the appropriate exposure from the brightness level in the image, taking into account the set ISO sensitivity, shutter speed, etc., and sets the aperture and electronic shutter speed in the imaging system 101. And the signal amplification rate in the initial signal processing unit 102 are controlled.
- the actual shooting is performed, and the image signal is transferred to the image buffer 103 in the same way as for the pre-imaging. Transferred to The actual photographing is performed based on the exposure conditions obtained by the photometric evaluation unit 110, and the conditions at the time of photographing are transferred to the control unit 121.
- the image signal in the image buffer 103 is divided into three image signals of R, G, and B by the interpolation processing unit 104 and interpolated, and transferred to the WB processing unit 105. Is done. In the WB processing unit 105, the achromatic R 0
- the WB processing unit 105 calculates the WB coefficient calculated for the RGB signal of the image based on the WB setting set before shooting via the external I / F unit 122 and transferred to the control unit 121. And transfer it to the color space conversion unit 106. The information of the WB coefficient is transferred to the control unit 121.
- the color space conversion unit 106 converts the three RGB image signals into a predetermined color space, for example, three image signals Y, Cb, and Cr in a YCbCr space. Y, Cb, and Cr are calculated by the following equations.
- the RGB signal is separated into a luminance component Y and color components Cb and Cr.
- the saturation emphasis unit 107 performs saturation emphasis by applying predetermined coefficients to the color components C b and C r, and the color space inverse transformation unit 108 again converts the RGB from the YC b C r space.
- the processed image signal is transferred to the post-processing unit 109, where the post-processing unit 109 performs known compression processing and the like, and records and stores the signal on a memory card or the like.
- FIG. 2 is a diagram showing an example of the configuration of the saturation emphasizing unit 107 of FIG. 1.
- the saturation emphasizing unit 107 is composed of a coefficient determining unit 201 and a coefficient applying unit 202.
- the coefficient determining unit 201 acquires the ISO sensitivity information from the control unit 121 and determines the saturation enhancement coefficient according to the information.
- the coefficient application unit 202 multiplies the Cb and Cr signals input from the color space conversion unit 106 by the saturation emphasis coefficient k determined by the coefficient determination unit 201 to multiply the color.
- Degree emphasis processing is performed and output to the color space inverse conversion unit 108.
- noise will be described with reference to FIG. Figure 3 plots the change in noise with respect to signal level for each ISO sensitivity.
- the noise amount can be expressed by an equation in which a constant term is added to a function of the power of the signal value level.
- N o; L + ⁇ (3) can be approximated.
- a, j8, and ⁇ vary depending on the ISO sensitivity.
- the noise amount changes according to the signal level L in each of R, G, and ⁇ , and increases as the IS ⁇ sensitivity increases. So, for example, shoot at ISO 80 and emphasize the saturation Even if there is no problem with ISO 2, color noise may be noticeable in ISO 320.
- the coefficient determining unit 201 in FIG. 2 holds a table as shown in FIG. 4, and when the ISO sensitivity information is acquired from the control unit 121, the table is referred to by acquiring the ISO sensitivity information.
- the saturation enhancement coefficient k (one of k 0, k 1, or k 2) corresponding to the obtained ISO sensitivity information is selected.
- k0 is a standard coefficient, for example, 1.4
- k1 is a coefficient slightly smaller than k0, for example, 1.3
- k2 is a smaller coefficient, for example, 1.1. It is. Setting k to 1.0 disables saturation enhancement.
- the saturation emphasis can be weakened to prevent the color noise from being noticeable.
- FIG. 5 is a diagram for explaining the present modification.
- FIG. 5 shows an example of the configuration of the saturation emphasizing unit 107 similarly to FIG. 2.
- the three image signals Y, Cb, and Cr output from the color space converting unit 106 are The difference is that the data is input not only to the coefficient application unit 202 but also to the coefficient determination unit 211.
- FIG. 6B is a diagram for explaining an example in which a saturation enhancement coefficient is determined using a look-up table (hereinafter referred to as LUT) instead of a function. That is, the coefficient determining unit 211 selects an appropriate LUT from LUTO, LUT1, and LUT2 according to the ISO sensitivity information from the control unit 121, and selects the saturation emphasis coefficients k0, kl. Or determine k 2.
- LUT look-up table
- a correction coefficient may be selected according to the sensitivity of I S, and this may be multiplied by a coefficient determined by a function or LUT to obtain a final coefficient k. This is useful, for example, when LUT is used but it is difficult to have more than one LUT.
- YC b C r is used as the color space for performing saturation enhancement.
- a uniform color space such as L * a * b * and a calculation formula at the time of conversion are used.
- Other simplified color spaces may be used.
- saturation enhancement is performed by simply multiplying the coefficient by the coefficient application unit 202.
- the method of applying the coefficient is not limited to the multiplication, but may be an addition / subtraction or a higher-order function. May be applied.
- the entire configuration and the configuration of the saturation enhancement unit are the same as those in FIGS. 1, 2, and 5, except that the operation is different from the input signal to the coefficient determination unit in FIGS. 2 and 5.
- the description of the configuration is omitted because it is the same
- the coefficient determining unit 201 in FIG. 2 holds a tape as shown in FIG. 12.
- the staple is referred to, and the saturation emphasis coefficient that matches the obtained WB coefficient information is selected. That is, in v ⁇ , if the WB coefficient is less than a predetermined value, k0 (standard) (for example, 1.3) is selected, and if it is more than a predetermined value, k1 (small) (for example, 1. 0).
- the WB coefficient When the WB coefficient is very large, the WB is often insufficient or the white color is distorted in other colors even though the white color is good.
- the WB averages the RGB values of the entire screen or a part of the screen that is close to achromatic color, so that the RGB specific power becomes S1. Sometimes it doesn't work well in places where there is no security.
- Figures 8A and 8B show the relationship between WB shift and saturation enhancement.
- Figure 8A shows some colors in images where WB worked properly.
- the horizontal axis of the graph indicates the color signal C r described in the first embodiment, and the vertical axis indicates the color signal C b.
- the black diamonds with symbols A0 to A5 indicate the CbCr coordinates of the original color, and the white diamonds with symbols A'0 to A'5 emphasize the saturation. Shows the CbCr coordinates when touched.
- a 0 is an achromatic color point, and its coordinates hardly change even if saturation is emphasized.
- a 0 and A ′ 0 stay on the origin O. Also, the whole image becomes vivid, but the hue does not change much.
- Fig. 8B shows the color coordinates when the WB is shifted.
- the black squares with symbols B0 to B5 indicate the CbCr coordinates of the original color, and the symbols B'0 to:
- the white square with B'5 indicates the CbCr coordinates when saturation is enhanced.
- the achromatic point B 0 is shifted from the origin O, and the coordinates of the entire image are offset, and the shift is increased by saturation enhancement. As a result, the entire image appears colored. Therefore, when there is a large deviation in the white balance, it is better not to increase the saturation enhancement amount. Therefore, in the present embodiment, when the WB coefficient is equal to or larger than a predetermined value, the saturation enhancement coefficient of k1 is selected from the table shown in FIG. 7 to weaken the saturation enhancement.
- the saturation emphasis is weakened, and it is possible to prevent the color of the image from becoming too large and the appearance from being deteriorated.
- the saturation enhancement coefficient is determined adaptively from the Y, Cb, and Cr values of the image as shown in FIG. 5, instead of directly selecting the coefficient k, a function or function is used. The LUT and correction coefficient may be selected. 6
- the third embodiment is characterized in that the saturation enhancement is changed according to both the white balance (WB) coefficient and the ISO sensitivity.
- the coefficient determination unit 201 shown in FIG. 2 holds a table as shown in FIG. 9 and obtains the WB coefficient information and the I s O sensitivity information from the control unit 121. With reference to the table, a saturation enhancement coefficient corresponding to the values of the acquired WB coefficient information and ISO sensitivity information is selected. That is, first, when the WB coefficient is equal to or greater than a predetermined value, a small coefficient k
- the standard coefficient k 0 is selected.
- the medium saturation enhancement coefficient 1 is selected.
- the small saturation enhancement coefficient k 2 is selected.
- the saturation enhancement is weakened, and the coloration of the image becomes too large or the noise is noticeable. Can be prevented from being damaged. 7 Further, in the third embodiment, it is first determined whether the WB coefficient is equal to or more than a predetermined value or less than a predetermined value. First, it is determined whether the ISO sensitivity is equal to or more than a predetermined value or less than a predetermined value. When is less than a predetermined value, the saturation emphasis coefficient k may be determined according to the magnitude of the WB coefficient.
- the WB processing unit 105 retains the preset that has already been held. Select the default value as the WB coefficient. If the WB setting is in auto mode, the WB coefficient is calculated automatically. The WB coefficient selected in the preset mode or calculated in the auto mode is transferred to the control unit 121, and is multiplied by the RGB signal of the image. Transferred to 106. The WB processing unit 105 transfers the WB determination information to the control unit 121 together with the WB coefficient.
- B / G the ratio of B and G
- R / G, B / G, and the luminance are within a predetermined range (see FIG.
- the WB processing unit If there is no white image, or if the calculated WB coefficient deviates from the white judgment area as indicated by point A in FIG. 10, the effect of white balance may not be sufficient. Therefore, the WB processing unit
- 105 is a value indicating that the calculated WB coefficient is used as a standard (for example, 0) is transmitted to the control unit 122 as WB determination information as WB determination information, and the calculated WB coefficient determination result is obtained.
- a preset value is selected from, a value indicating that it is non-standard (for example, 1) is
- the coefficient determination unit 201 shown in FIG. 2 holds a template as shown in FIG. 11, and when the WB coefficient and the WB determination information are obtained from the control unit 121, the table is read. With reference to the obtained WB coefficient and the value of the WB determination information, select a saturation enhancement coefficient corresponding to the value. That is, when the WB coefficient is equal to or more than the predetermined value, the smallest saturation enhancement coefficient k 2 (for example, 1.0) is selected regardless of the WB determination information. If the WB coefficient is less than the predetermined value, the saturation emphasis coefficient k is selected based on the WB determination information.
- a standard saturation emphasis coefficient k 0 (for example, 1.3 to 1.4) is selected, and when the WB judgment is non-standard, a slightly lower saturation is used.
- Select the emphasis coefficient k 1 (for example, 1.1).
- the saturation enhancement coefficient is adaptively determined from the Y, Cb, and Cr values of the image as shown in FIG. 5, instead of directly selecting the coefficient k, a function or a function is used. LUT and correction coefficient may be selected.
- the saturation enhancement coefficient k may be determined only by the WB determination.
- the saturation enhancement unit determines whether the saturation enhancement is changed according to the WB determination information has been described.
- the presence or absence of a white balance shift is determined by the saturation enhancement unit.
- the overall configuration is the same as that in FIG. 1 and the description is omitted. However, since the configuration of the saturation emphasizing unit 107 is different, it will be described below.
- FIG. 12 shows the configuration of the saturation emphasizing unit 107 of the present embodiment.
- the WB judging unit 3 12 is added to the coefficient applying unit 202 and the coefficient determining unit 3 11 1, and the WB judging unit 3 1 2 is used. It has more. Fig. 2 and Fig.
- an image signal from the color space conversion unit 106 is input to a coefficient application unit 202 and a WB determination unit 312.
- the coefficient determination unit 3 1 1 is connected to the control unit 1 2 1, coefficient application unit 2 0 2 and WB determination unit 3 1 2, and outputs the output of the WB determination unit 3 1 2 and the control unit 1
- the WB determination unit 312 takes the average values CbO and CrO of Cb and Cr, and sends the result to the coefficient determination unit 311. If the WB process is working, C b 0 and C r 0 are close to zero. However, as described in the fourth embodiment, when the preset value is selected in the auto mode, the average value of C b, ⁇ 1 ⁇ ⁇ 1) 0 and ⁇ 1 ⁇ 0 are 0 It is out of place. Therefore, when either C b O or C r O exceeds a predetermined value, Two
- the coefficient determination unit 311 holds a table as shown in Fig. 13 and obtains the WB mode and WB coefficient from the control unit 121 and the WB determination result from the WB determination unit 312. At that time, the saturation enhancement coefficient according to the obtained information is selected with reference to the corresponding tape. That is, first, it is determined whether the WB mode is the preset mode or the auto mode. In the case of the preset mode, the standard saturation emphasis coefficient k 0 is selected regardless of the WB coefficient and the WB determination result. . In addition, in the auto mode, it is determined whether the WB coefficient is less than a predetermined value or more than a predetermined value. If the WB coefficient is more than a predetermined value, a small saturation enhancement coefficient k regardless of the WB determination result. Select 2. In addition, when the WB coefficient is less than a predetermined value in the auto mode, the WB determination determines whether the standard WB is standard or non-standard. At this time, a small saturation enhancement coefficient 1 is selected.
- the WB mode is the auto mode and the WB coefficient is equal to or more than the predetermined value, or when the WB mode is the auto mode and the WB coefficient is less than the predetermined value, If the judgment is non-standard, decrease the saturation enhancement coefficient.
- a photographed signal may be raw data that has not been processed.
- a configuration is also possible in which WB coefficients and the like are output as header information and processed separately by a software program.
- FIG. 14 is a diagram illustrating an example of a software process relating to software processing for saturation enhancement.
- the image signal and the header information such as the IS ⁇ sensitivity ⁇ WB mode, WB judgment information and WB coefficient are read.
- R the header information such as the IS ⁇ sensitivity ⁇ WB mode, WB judgment information and WB coefficient.
- step S3 Generate a three-pane image of GB.
- step S3 a white balance coefficient is obtained from the head information, and white balance processing is performed.
- step S 4 color space conversion is performed and R G ⁇ to ⁇
- the WB coefficient is obtained, and if the value is equal to or more than a predetermined value, a predetermined LU name is selected, and the flow proceeds to step S8. WB coefficient force s If the specified value is not dropped, step S
- step 6 WB determination information is obtained from the header information, and if non-standard, a predetermined LUT name is selected, and the procedure goes to step S8. If the WB judgment information is standard in step S6, go to step S7. Find the ISO sensitivity from the card information and select the LU name to be read according to the value. LUT selected in step S8 (Coefficient according to pixel Is read), and in step S9, the saturation enhancement coefficient k is calculated from the LUT. In step S10, coefficient k is applied to each of Cb and Cr. In step SI1, inverse color space conversion is performed, and the YCbCr signal is returned to the RGB signal. In step S12, it is determined whether the processing has been completed for all pixels.If not, the process of steps S4 to S11 is repeated, and the process is completed. Outputs an image signal in step S13 and ends.
- YCbCr is used as the color space for performing saturation enhancement.
- a uniform color space such as L * a * b * or a calculation at the time of conversion is used.
- Other color spaces obtained by simplifying expressions may be used.
- the saturation is emphasized by simply multiplying the coefficients by the coefficient application unit 202, the method of applying the coefficients is not limited to multiplication, and may be applied in the form of addition, subtraction, or a higher-order function.
- a coefficient determination unit that determines a saturation enhancement coefficient according to the sensitivity setting during shooting
- a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation enhancement coefficient determined by the coefficient determination unit;
- An image processing system comprising: (Corresponding embodiment)
- the embodiment according to the present invention is the same as the first embodiment shown in FIGS. 1, 2, 4, 5, 6A and 6B, but also the third embodiment shown in FIG. Corresponding.
- the coefficient determining unit in the configuration corresponds to the coefficient determining unit 201 shown in FIG. 2 and the coefficient determining unit 211 shown in FIG. 5, and the coefficient applying unit in the configuration corresponds to FIG. 2 and FIG. This corresponds to the coefficient application section 202 shown in (2).
- the coefficient determination unit selects a saturation enhancement coefficient according to the sensitivity setting at the time of shooting, thereby weakening the saturation enhancement under shooting conditions with a lot of noise.
- An image processing system capable of enhancing the saturation of an image
- a coefficient determination unit that determines a saturation enhancement coefficient according to a white balance coefficient at the time of shooting
- a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation enhancement coefficient determined by the coefficient determination unit;
- An image processing system comprising:
- Embodiments of the present invention include a second embodiment shown in FIGS. 1, 2, 5, and 7, a third embodiment shown in FIG. 9, and a fourth embodiment shown in FIG. Embodiment, FIG. 12 and FIG. 13 Corresponds to the fifth embodiment.
- the coefficient determining means in the configuration corresponds to the coefficient determining unit 201 shown in FIG. 2, the coefficient determining unit 211 shown in FIG. 5, and the coefficient determining unit 311 shown in FIG.
- the coefficient application section corresponds to the coefficient application section 202 shown in FIG. 2, FIG. 5, and FIG.
- the coefficient determining means selects a saturation enhancement coefficient according to the white balance coefficient at the time of shooting, thereby weakening the saturation enhancement under the condition of large white noise shift (
- a coefficient determination unit that determines a saturation enhancement coefficient according to the reliability of the white balance at the time of shooting
- a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation enhancement coefficient determined by the coefficient determination unit;
- An image processing system comprising:
- FIGS. 1, 2, 5, and 1 Embodiments of the present invention are shown in FIGS. 1, 2, 5, and 1.
- the fourth embodiment shown in FIG. 1 corresponds to this.
- the coefficient determination unit in the configuration corresponds to the coefficient determination unit 201 shown in Fig. 2 and the coefficient determination unit 211 shown in Fig. 5, and the coefficient application unit in the configuration is shown in Figs.
- the reliability of the white balance in the configuration corresponds to the WB determination information transmitted by the WB processing unit 105 shown in FIG.
- the coefficient determination unit selects a saturation enhancement coefficient according to the reliability of the white balance at the time of shadowing, thereby weakening the saturation enhancement under the condition of large white balance deviation.
- Color saturation (hue shift) of the entire image is enlarged to enhance the saturation, and it is possible to prevent a situation in which the appearance is worsened.
- An image processing system capable of enhancing the saturation of an image
- a white balance determination unit that determines the reliability of the white balance based on the image signal
- a coefficient application unit that performs a saturation enhancement process on the image processing system.
- An embodiment according to the present invention corresponds to the fifth embodiment shown in FIGS. 1, 12, and 13.
- the white balance determination unit in the configuration corresponds to the WB determination unit 312 in FIG. 12, and the coefficient determination unit in the configuration corresponds to the coefficient determination unit 311 1 shown in FIG.
- the coefficient application unit under development corresponds to the coefficient application unit 202 shown in FIG.
- the WB determination unit determines the reliability of the white noise based on the image signal, and the coefficient determination unit selects a saturation emphasis coefficient according to the determination result of the WB determination unit. Weakens saturation enhancement under conditions of large non-uniformity.
- Color saturation (hue shift) of the entire image is enlarged to enhance the saturation, and it is possible to prevent a situation in which the appearance is worsened.
- a coefficient application step of performing a saturation enhancement process on an image signal using the saturation enhancement coefficient determined in the coefficient determination step is provided.
- a coefficient application step of performing a saturation enhancement process on an image signal using the saturation enhancement coefficient determined in the coefficient determination step is provided.
- a coefficient application step of performing a saturation enhancement process on an image signal using the saturation enhancement coefficient determined in the coefficient determination step is provided.
- a coefficient determination unit that determines a saturation enhancement coefficient according to the gain of the image signal at the time of shooting
- a coefficient application unit that performs a saturation enhancement process on the image signal using the saturation enhancement coefficient determined by the coefficient determination unit;
- An image processing system comprising:
- the first embodiment, the second embodiment, and the third embodiment correspond to each other.
- the saturation enhancement characteristic is weakened under conditions where the gain of the image signal is large.
- Noise that has been enhanced as a result of amplifying the image signal can be prevented from being further enhanced to degrade the appearance.
- an image processing system and an image processing method capable of effectively emphasizing saturation without deteriorating appearance by emphasizing noise in consideration of noise characteristics of an imaging system.
Abstract
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US11/314,699 US20060098254A1 (en) | 2003-06-24 | 2005-12-21 | Image processing system and image processing method |
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JP2003179877A JP4002863B2 (ja) | 2003-06-24 | 2003-06-24 | 画像処理システム及び画像処理方法 |
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EP2464125B1 (en) * | 2004-12-17 | 2013-07-31 | Nikon Corporation | Image processing device |
US8049789B2 (en) * | 2006-12-15 | 2011-11-01 | ON Semiconductor Trading, Ltd | White balance correction using illuminant estimation |
JP5056006B2 (ja) * | 2006-12-26 | 2012-10-24 | 株式会社ニコン | 撮像装置およびプログラム |
US7974487B2 (en) * | 2007-04-17 | 2011-07-05 | Kabushiki Kaisha Toshiba | System and method for image white balance adjustment |
DE102007022888B3 (de) * | 2007-05-14 | 2008-11-27 | Olympus Winter & Ibe Gmbh | Verfahren und Vorrichtung zur Bildverarbeitung von Endoskopbildern |
JP5529424B2 (ja) * | 2009-03-11 | 2014-06-25 | ソニー株式会社 | 画像処理装置、画像処理方法及びコンピュータプログラム |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6320993A (ja) * | 1986-07-15 | 1988-01-28 | Matsushita Electric Ind Co Ltd | ホワイトバランス調整装置 |
JPH0787513A (ja) * | 1993-09-10 | 1995-03-31 | Sanyo Electric Co Ltd | 映像信号処理装置及び映像信号処理方法 |
JP2001054013A (ja) * | 1999-08-13 | 2001-02-23 | Fuji Photo Film Co Ltd | 撮像信号処理装置およびその処理方法 |
JP2003143622A (ja) * | 2001-11-07 | 2003-05-16 | Sanyo Electric Co Ltd | 画像処理装置 |
JP2003163882A (ja) * | 2001-11-22 | 2003-06-06 | Fuji Photo Film Co Ltd | 画像処理システム、撮像装置、画像処理装置、画像処理方法、及びプログラム |
Family Cites Families (2)
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CN1165183C (zh) * | 2000-05-15 | 2004-09-01 | 北京北达华彩科技有限公司 | 自适应色度补偿法及其补偿装置 |
JP3631169B2 (ja) * | 2001-06-19 | 2005-03-23 | 三洋電機株式会社 | ディジタルカメラ |
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2003
- 2003-06-24 JP JP2003179877A patent/JP4002863B2/ja not_active Expired - Fee Related
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2004
- 2004-06-24 WO PCT/JP2004/009264 patent/WO2004114678A1/ja active Application Filing
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2005
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6320993A (ja) * | 1986-07-15 | 1988-01-28 | Matsushita Electric Ind Co Ltd | ホワイトバランス調整装置 |
JPH0787513A (ja) * | 1993-09-10 | 1995-03-31 | Sanyo Electric Co Ltd | 映像信号処理装置及び映像信号処理方法 |
JP2001054013A (ja) * | 1999-08-13 | 2001-02-23 | Fuji Photo Film Co Ltd | 撮像信号処理装置およびその処理方法 |
JP2003143622A (ja) * | 2001-11-07 | 2003-05-16 | Sanyo Electric Co Ltd | 画像処理装置 |
JP2003163882A (ja) * | 2001-11-22 | 2003-06-06 | Fuji Photo Film Co Ltd | 画像処理システム、撮像装置、画像処理装置、画像処理方法、及びプログラム |
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US20060098254A1 (en) | 2006-05-11 |
JP4002863B2 (ja) | 2007-11-07 |
JP2005020186A (ja) | 2005-01-20 |
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