WO2015056514A1 - Imaging device and color-correction method - Google Patents

Imaging device and color-correction method Download PDF

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Publication number
WO2015056514A1
WO2015056514A1 PCT/JP2014/074520 JP2014074520W WO2015056514A1 WO 2015056514 A1 WO2015056514 A1 WO 2015056514A1 JP 2014074520 W JP2014074520 W JP 2014074520W WO 2015056514 A1 WO2015056514 A1 WO 2015056514A1
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color
pixel
hue
signal
correction
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PCT/JP2014/074520
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French (fr)
Japanese (ja)
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昭宏 加藤
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株式会社日立国際電気
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Priority to JP2013-216294 priority
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Publication of WO2015056514A1 publication Critical patent/WO2015056514A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/643Hue control means, e.g. flesh tone control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/68Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Abstract

This imaging device, which has a means for detecting a specific hue in each pixel of per-pixel-signal red, green, and blue primary-color video signals generated by color-separation optics and three or more imaging elements and independently correcting said specific hue in each pixel in order to prevent the contours of a light source and illuminated objects from losing contrast and becoming difficult to see due to blue oversaturation when using high-luminance blue illumination such as LEDs, also has a means for detecting the levels of luminance signals for pixels in a given hue region within the aforementioned specific hue and a means for compressing the positive directions of color-correction signals into blue video signals in accordance with the per-pixel-signal luminance signals. This imaging device compresses the positive directions of color-correction signals into blue video signals, in accordance with high-luminance luminance signals, on a per-pixel-signal basis.

Description

Imaging apparatus and color correction method

The present invention relates to an imaging apparatus, and more particularly to a function of correcting a specific hue for each pixel.

The television camera has a function of detecting a specific hue for each pixel and correcting the specific hue for each pixel, which is called 6-color independent masking or 12-color masking (see Patent Document 1).
Further, the digital still camera has a correction function for correcting the color difference signal based on the theoretical limit of the luminance signal and color reproduction and suppressing the saturation of the high luminance part (see Patent Document 2).
Furthermore, the digital still camera has a function of highlight cyan for obtaining a saturation correction coefficient based on a luminance signal and a saturation enhancement function for obtaining a saturation correction coefficient based on a hue signal (see Patent Document 3).

By the way, in recent years, with the improvement of the color rendering performance of LED light sources, LED lighting is increasingly used for television studio lighting in addition to conventional halogen lamps. Along with this, it has become possible to obtain more various lighting effects by using a high-intensity blue light source that could not be realized with a conventional light source.

However, when a high-intensity blue light source is photographed with a television camera, the color space composed of the three primary colors red, green, and blue saturates before other colors because the blue expression area is narrow. As a result, the blue light source itself and the outline of the object illuminated by the blue light source are crushed, resulting in an image that is very difficult to see. As a result, the masking level of the camera is lowered to lower the blue saturation, but the saturation of other colors that are not normally saturated is also lowered, resulting in an overall lack of vividness. End up.

JP-A-9-247701 JP 2001-238129 A JP 2004-31467 A

Therefore, an object of the present invention is to prevent the blue light source and the blue color of the illuminated subject from being saturated.

In order to solve the above-described object, the present invention provides (6 colors, 6 colors and flesh color) of red, green, and blue primary color video signals for each pixel signal generated from a color separation optical system and three or more image sensors. Detect a specific hue (pre-gamma or post-gamma) for each pixel (12 colors, 12 colors plus skin color, or 16 colors), and independently correct (masking) the specific hue for each pixel (before or after gamma) And a means for detecting a luminance signal level of a pixel in an arbitrary hue region within the specific hue, and a blue video signal corresponding to the luminance signal for each pixel signal. Means for compressing the positive direction of the color correction signal, and compressing the positive direction of the color correction signal to the blue video signal corresponding to the high luminance signal for each pixel signal. It is an imaging device.
In addition, a specific hue is detected for each pixel of red, green, and blue primary color video signals for each pixel signal generated from the color separation optical system and three or more image sensors, and a specific hue is independently determined for each pixel. In a color correction method characterized by compressing the positive direction of a color correction signal to a blue video signal corresponding to a high luminance signal for each pixel signal in an imaging device having a correction means is there.

According to the present invention, it is possible to prevent the blue light source and the blue color of the illuminated subject from being oversaturated.

Block diagram (matrix before gamma) showing an embodiment of the television camera of the present invention Block diagram (matrix after gamma) showing an embodiment of the television camera of the present invention Schematic diagram showing R / G / B magnitude relationship and corresponding hue range The block diagram which shows the structure of the hue detection correction | amendment part of one Example of this invention. Explanatory drawing of the hue area | region in the color tone correction | amendment of one Example of this invention The conceptual diagram of the hue area | region of one Example of this invention Explanatory drawing of calculation principle of primary color component and complementary color component of one embodiment of the present invention Explanatory drawing of the color tone correction process by the 6 color independent color tone correction method of one Example of this invention. Correction characteristic diagram of one embodiment of the present invention The block diagram which shows the structure of the hue detection correction | amendment part of other one Example of this invention. Explanatory drawing of the hue area | region in the color tone correction of other one Example of this invention. Conceptual diagram of a hue area according to another embodiment of the present invention. Explanatory drawing of calculation principle of primary color component and complementary color component of another embodiment of the present invention Correction characteristic diagram of another embodiment of the present invention Schematic diagram showing the operation of masking level adjustment of one embodiment of the present invention Proposed FIG. Schematic diagram showing color vector waveforms before and after masking level adjustment of one embodiment of the present invention Proposed FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1A, 1B, and 2. FIG.
1A and 1B are block diagrams showing an embodiment of a television camera of the present invention. FIG. 1A is a pre-gamma matrix and FIG. 1B is a post-gamma matrix. Incident light from the subject is imaged by the lens unit 31, and the formed incident light is decomposed into red light, green light, and blue light by the prism unit 32 of the television camera 30, and each is a CCD (Charge Coupled Device) unit. Photoelectric conversion is performed by 33R, 33G, and 33B. The photoelectrically converted R / G / B signal is subjected to correlated double sampling, gain correction, and analog-to-digital conversion by an AFE (analog front end processor) 34, and is a video signal processing unit 35 with a hue detection correction function. Various video signal processing such as color correction, contour correction, gamma correction, knee correction, and the like are performed.

After various video signal processing and the like are performed in the digital signal processing unit 5, Y = 0.2126R + 0.7152G + 0.0722BPb = 0.5389 (BY) Pr = 0.6350 (RY) R / G / B is converted into a luminance signal (Y) and a color difference signal (Pb / Pr). Then, it is converted into a serial video signal by the parallel-serial converter 7 and outputted to the outside.

A CPU (Central Processing Unit) 39 controls each part of the television camera 1. In addition, the image display unit 40 of the viewfinder or the monitor display displays a setting menu of the imaging apparatus and an arbitrary hue region in the specific hue.

Here, the hue detection / correction unit 38 in the video signal processing unit 35 with the hue detection / correction function shown in FIG. 3 of the block diagram showing the configuration of the hue detection / correction unit according to the embodiment of the present invention is the R / G / B. The hue range in which the color of the subject is detected is detected from the magnitude relationship between the signal levels. FIG. 2 shows the hue range corresponding to the magnitude relationship of R / G / B. Although the hue is displayed in 6 divisions here, the hue can be further subdivided by further subdividing the magnitude relationship between the signal levels of R / G / B.

The CPU 9 passes information on an arbitrary hue range set by the user to the hue detection correction unit 38 in the video signal processing unit 35 with a hue detection correction function, and the hue detection correction unit in the video signal processing unit 35 with a hue detection correction function. 38 passes the hue information of the pixel and the luminance information of the pixel that match the user-set hue range to the CPU 9. Based on the hue information of the pixel and the luminance information of the pixel, the CPU 9 controls the hue correction calculation in the video signal processing unit 35 with a hue detection correction function to prevent saturation of the blue of the pixel at the high luminance signal level. To do.

In the viewfinder or monitor display 40, the menu screen is superimposed on the subject image, and the user sets the hue range and the luminance signal level while viewing the menu screen. In addition, in order to check whether the hue range set by the user matches the target subject's color, it is superimposed on the 40 subject video in the viewfinder or monitor display and matches the set hue range Markers may be displayed in these areas.
FIG. 14 is a schematic diagram illustrating an operation of masking level adjustment according to an embodiment of the present invention, and FIG. 15 is a schematic diagram illustrating color vector waveforms before and after masking level adjustment according to an embodiment of the present invention.

As described above, according to the present invention, it is possible to prevent the blue light source and the blue color of the illuminated subject from being oversaturated.

Another embodiment of the present invention will be described below with reference to FIGS.
In FIG. 3, first, the arithmetic / comparators 1, 2, and 3 calculate the color difference signals RG, RB, and GB from the input video signals R, G, and B, and compare their magnitudes. Are supplied to the hue region determination circuit 4 and the primary color component amount and complementary color component amount calculation circuit 5.
Therefore, the hue area determination circuit 4 first determines the hue area as shown in FIG. 5 based on the calculation results of the calculation / comparators 1, 2, and 3. FIG. 5 is a conceptual diagram of this hue region, in which a straight line from the center point in each color direction is used as a reference line, and is divided into six hue regions.
Further, the primary color component amount and complementary color component amount calculation circuit 4 compares the levels of the signals R, G, and B to determine the maximum level, the intermediate level, and the minimum level as shown in FIG. Then, in the process of this comparison and determination, the level difference between the maximum level and the intermediate level is obtained and used as the primary color component amount, and further the level difference between the intermediate level and the minimum level is obtained and used as the complementary color component amount. Here, the maximum level color corresponds to the primary color, and the minimum level component corresponds to the white component. Then, the complementary color can be determined from the information of the maximum level color and the minimum level color. As a result, as shown in FIG. 4, the primary color component and the complementary color component can be determined.

In the example of FIG. 6, since the maximum level is R and the intermediate level is G, the primary color component is R, and the complementary color component is Ye (yellow), which is the hue between R and G. The primary color component amount is RG, the complementary color component amount is GB, and the minimum level B amount is the white component amount. Therefore, in the case of FIG. 8, the result shown second from the bottom in FIG. 4 is obtained.
The determination result of the hue region by the determination circuit 4 is supplied to the constant selection circuit 6, and a specific gain constant is selected according to the determination result and is supplied to the multipliers 7 and 8, so that the calculation circuit 5 calculates it. Correction is performed by multiplying the primary color component amount and the complementary color component amount. For this reason, in the constant selection circuit 6, specific gain constants corresponding to the respective hue regions from the region 1 to the region 6 are set in advance.
The primary color component amount and the complementary color component amount thus multiplied by the gain constant by the multipliers 7 and 8 are sent to the data selection / addition circuit 11 for selecting addition / subtraction and connection selection for the video signals R, G, B, respectively. Are supplied directly via the complements (-1 times multipliers) 9 and 10, respectively. Then, after the addition destination is selected by the data selection / addition circuit 11, it is supplied to each adder 12, 13, 14 and added to the video signals R, G, B. Therefore, the above processing is shown in the flowchart in FIG.

Therefore, when correcting the tone of the signal R, for example, in the case of correction in the saturation direction, the primary color component amount RG is multiplied by a specific constant Kr and then added to the video signal R. At this time, if the ratio by the constant Kr is in the range of −1 to 1 times, the level difference between the intermediate level and the minimum level (complementary color component amount) and the minimum level amount (white component amount) are also obtained by this correction. It does not change.
When correcting the saturation of the signal Ye, the complementary color component amount GB is multiplied by a specific constant Ky and then added to R and G, respectively. Also at this time, if the ratio according to the constant Ky is in the range of −1 to 1 times, this correction also makes the difference between the maximum level and the intermediate level (primary color component amount) and the minimum level amount (white component amount). Does not change.

Therefore, in this case, if the constants Kr and Ky are operated, the saturation direction of the primary color R and the complementary color Ye can be independently corrected while maintaining the white balance. In the above-described six-color independent tone correction method, the chromaticity direction can be corrected independently, and even when the input video signal is in a different hue, independent correction is possible as well. Is omitted.

Hereinafter, a color tone detection and correction apparatus according to another embodiment of the present invention will be described in detail with reference to the illustrated embodiment. First, FIG. 9 shows an embodiment of the present invention, in which 15 is an intermediate hue setting circuit, 16 is a primary color / complementary color area determination circuit, 17 is an α / β, β / α calculation circuit, 18 is a constant selection circuit, 20 is a multiplier, 21 is a data selection addition / subtraction circuit, and the others are the same as in the prior art shown in FIG.

The intermediate hue setting circuit 15 functions to enable setting of an intermediate color that is newly set as a reference color. For example, a flesh color (hue F) that is an intermediate color between R and Ye is preset. The primary color / complementary color area determination circuit 16 determines the hues of the input video signals R, G, and B based on the data from the hue area determination circuit 4 and the hue F given from the intermediate color hue setting circuit 15 to obtain a predetermined color. It serves to generate the control signal S.
The α / β, β / α calculating circuit 17 functions to calculate predetermined constants α / β, β / α based on the data supplied from the intermediate hue setting circuit 15. These constants α / β and β / α will be described later. The constant selection circuit 18 functions to select and output one of constants α / β and β / α according to the control signal S.

Multipliers 19 and 20 multiply the primary color component and the complementary color component output from the primary color component amount and complementary color component amount calculation circuit 5 by one of the constants α / β and β / α selected by the constant selection circuit 18. To work. The data selection addition / subtraction circuit 21 selects data according to the determination result by the hue area determination circuit 4 and the control signal S, and performs predetermined addition / subtraction. Details of the operation of this circuit will be described later.

Next, the operation of this embodiment will be described. 10 and 11 are diagrams showing saturation (color saturation) and chromaticity (hue) for explaining the operation principle of the present invention. In these diagrams, the directions away from the origin O are saturation and saturation. The direction perpendicular to (the direction in which the circle is drawn) represents the chromaticity.

Here, the present invention can be applied to any intermediate color correction, but it is considered that the present invention is particularly often applied to skin color correction. In this embodiment, therefore, correction of skin color will be mainly described below as an example. Then, since the hue of this skin color is located in the region between R and Ye, that is, the region 6, in these FIGS. 10 and 11, only the region 6 from R (red) to Ye (yellow) is shown. Is represented by a point F.

Therefore, this point is set as the auxiliary reference color F as shown in the figure, and the data is set in the intermediate color hue setting circuit 15 as described above.

Thus, the region 6 is divided into two auxiliary regions, that is, the region (1) and the region (2) by an axis passing from the center point O to the auxiliary reference color F point, that is, the auxiliary reference line. . Next, the hue of the input video signal is divided by the primary color / complementary color area determination circuit 16 into an area (1) between R and F and an area (2) between F and Ye as shown in FIG. Judgment. Then, first, in this case, since the operation is performed when the determination result of the hue region determination circuit 4 is the region 6, the primary color component amount and the complementary color component amount output from the calculation circuit 5 are respectively It is as follows.

Primary color component amount = RG = Rc complementary color component amount = GB = Yc Next, the primary color / complementary color region indicates whether the hue of the input video signal is in these regions (1) or (2). Identification is made by the determination of the determination circuit 16, and correction is performed separately as shown below.

<Correction process in area (1)> At this time, the output from each circuit is as follows. First, the constant selection circuit 18 selects the constant β / α and outputs the constant β / α to the multipliers 19 and 20. Next, the data selection addition / subtraction circuit 21 outputs a signal [Rc−Yc × (β / α)], a signal (−Yc), and a signal [Yc × (β / α)]. Further, the constant selection circuit 6 selects constants Kr and Kf and outputs these constants Kr and Kf to the multipliers 7 and 8.

As a result, first, the signal [Rc−Yc × (β / α)] × Kr + Kf × [Yc × (β / α)] is output from the data selection / addition circuit 11 to the adder 12 and the signal R Then, the signal [(−Yc) × Kf] is output to the adder 14 and added to the signal B.

Therefore, in FIG. 10, when the point A is the coordinates of the input video signal and is represented by the vector A, the vector A is represented by the synthesis of the R component vector R1 and the skin color component vector F1.

A = R1 + F1 Next, assuming that Kr is a gain constant dedicated to adjusting the saturation direction of R and Kf is a gain constant dedicated to adjusting the saturation direction of skin color, when performing color correction in the saturation direction of R, | R1 | × Kr may be added in the saturation direction of R, that is, added to R. When color correction is performed in the saturation direction of the skin color, | F1 | × Kf may be added in the skin color saturation direction. .

Therefore, the calculation method of these amounts | R1 | and | F1 | and the addition method in the skin color saturation direction will be described. For this purpose, all corrections can be expressed as corrections to the R, G, and B components. It ’s fine. Therefore, R component basic vector is R, skin color component basic vector is F, Ye component basic vector is Y, and B component basic vector is B. F = α × Y + β × R = α × (−B) + β × R And

Next, the coordinate vector A of the input video signal is represented by the synthesis of the R component and the Ye component. Here, A = Y × Yc + R × Rc and Rc and Yc can be easily obtained as described in the conventional color tone correction method. In this case, R> G> B, and as is apparent from FIG. 9, Rc = RG and Yc = GB.

Then, A = Y × Yc + R × Rc = (1 / α) × (F−β × R) × Yc + R × Rc = F × Yc / α + R × (Rc−β × Yc / α), and thus | R1 | = Rc−β × Yc / α | F1 | = Yc / α.

Therefore, if F × Yc / α is expressed by vector R and vector B, F × Yc / α = (α × (−B) + β × R) × Yc / α = B × (−Yc) + R × (β × Yc / α).

Therefore, the above results are summarized as follows. That is, in order to perform color correction in the saturation direction of R, | R1 | Kr = (Rc−β × Yc / α) × Kr may be added to R. Next, in order to perform color correction in the skin color saturation direction, | F1 | × Kf may be added in the skin color saturation direction. This means that −Yc × Kf is added to B and (β Equal to adding (Yc / α) × Kf to R.

Here, if the angle between the R vector and the skin color vector is θ, α × Sin (60 ° −θ) = β × Sin (θ), and therefore β / α = Sin (60 ° −θ). / Sin (θ).

Therefore, when θ = 20 °, β / α = 1.7944. When this is set to ≈2.0, the correction at this time is (Rc− 2 × Yc) × Kr may be added to R, and for color correction in the saturation direction of the skin color, −Yc × Kf may be added to B and 2 × Yc × Kf may be added to R. Then, by changing β / α, the skin color reference axis can be adjusted.

The above is the description about the correction in the saturation direction, but the description is omitted because the same concept can be applied to the correction in the chromaticity direction.

<Correction process in area (2)> At this time, the output from each circuit is as follows. First, the constant selection circuit 18 selects a constant α / β and outputs the constant α / β to the multipliers 19 and 20. Next, the data selection addition / subtraction circuit 21 outputs a signal [Yc−Rc × (α / β)], a signal (Rc), and a signal [−Rc × (α / β)]. Further, the constant selection circuit 6 selects constants Ky and Kf and outputs these constants Ky and Kf to the multipliers 7 and 8.

As a result, the data selection / addition circuit 11 first outputs the signal [Rc × Kf] to the adder 12 and adds it to the signal R, and then the signal − [Yc−Rc × (α / β )] × Ky−Kf × [Rc × (α / β)] is output to the adder 14 and added to the signal B.

Therefore, in FIG. 3, when the point C is the coordinates of the input video signal and this is represented by a vector C, this vector C is represented by the synthesis of the Ye component vector Y1 and the skin color component vector F2.

C = Y1 + F2 Next, let Yy be a gain constant dedicated to adjusting the saturation direction of Ye, and Kf be a gain constant dedicated to adjusting the saturation direction of skin color. For color correction in the saturation direction of Ye, | Y1 | × Ky may be subtracted from B. For color correction in the skin color saturation direction, | F2 | × Kf may be added in the skin color saturation direction.

Next, the calculation method of | Y1 | and | F2 | and the addition method in the direction of skin color saturation are the same as those in the above-described region (1), and thus are as follows. C = Y × Yc + R × Rc = Y × Yc + (1 / β) × (F−α × Y) × RcF = F × Rc / β + Y × (Yc−α × Rc / β), and thus | Y1 | = Yc −α × Rc / β | F2 | = Rc / β.

Here, when F × Rc / β is expressed by a vector R and a vector B, F × Rc / β = (α × (−B) + β × R) × Rc / β = −B × (α × Rc / β) + R × Rc.

Therefore, the above results are summarized as follows. That is, when color correction in the saturation direction of Ye is performed, | Y1 | × Ky = (Yc−α × Rc / β) × Ky may be subtracted from B. Next, when performing color correction in the skin color saturation direction, | F2 | × Kf is added in the skin color saturation direction. This means that (−α × Rc / β) × Kf is set to B. It is equivalent to adding Rc × Kf to R.

Therefore, if the angle θ between the R vector and the skin color vector is set to 20 ° as in the above-described region (1), α / β = 0.5321 is obtained. When correcting the color in the saturation direction of Ye, (Yc−0.5Rc) × Ky may be subtracted from B, and when correcting the color in the saturation direction of the skin color, −0.5 × Rc × Kf may be added to B and Rc × Kf may be added to R.

The above is the description about the correction in the saturation direction, but the description is omitted because the same concept can be applied to the correction in the chromaticity direction.

The characteristics obtained by the correction described in the above sections (1) and (2) are shown in FIG. The characteristics shown in FIG. 4 are obtained by superimposing gain characteristics of color correction in the saturation direction of R, color correction in the saturation direction of Ye, and color correction in the saturation direction of the skin color. In addition, if the skin color saturation direction gain constant Kf is controlled, color correction in the skin color saturation direction can be performed regardless of the R saturation direction gain constant Kr and the Ye saturation direction gain constant Ky. I understand.

Therefore, according to this embodiment, the influence on R and Ye can be suppressed to a minimum, and the effective tone correction can be performed on the skin color, so that a sense of incongruity can be ensured when the television camera is switched. It can be lost.

Next, FIG. 5 shows correction characteristics according to another embodiment of the present invention. In this embodiment, a correction function having a gain characteristic with the skin color axis F as the center is generated and extracted. . This is added to the conventional function in the embodiment shown in FIG. 5. According to this method, correction can be performed in such a way as to compensate for an area that cannot be corrected by the conventional method.

In the above embodiment, the hue range is limited to R and Ye. However, it goes without saying that the present invention can be applied to any hue, and the type and number of reference colors are also applicable. Needless to say, it can be set arbitrarily.

According to the present invention, it is possible to prevent the blue light source and the blue color of the illuminated subject from being saturated, so that the present invention can be used for a television camera for photographing a high-luminance blue light source.

1, 2, 3: arithmetic / comparator, 4: hue area determination circuit, 5: primary color component amount and complementary color component amount calculation circuit, 6: constant selection circuit, 7, 8: multiplier 9, 10: complement (- 11: data selection adder circuits 12, 13, 14: adder, 15: intermediate hue setting circuit, 16: primary color / complementary color area determination circuit, 17: α / β, α / β calculation circuit, 18 : Constant selection circuit, 19, 20: multiplier, 21: data selection addition / subtraction circuit 30: television camera, 31: lens, 32: prism, 33R, 33G, 33B: CCD (charge coupled device), 34R, 34G, 34B : AFE (Analog Front End Processor), 35: Video signal processor with hue detection and correction function, 37: Parallel-serial converter, 39: CPU, 40: Viewfinder,

Claims (3)

  1. A specific hue is detected for each pixel of the red, green, and blue primary color image signals for each pixel signal generated from the color separation optical system and three or more image sensors, and the specific hue is corrected independently for each pixel. In an imaging apparatus having means,
    Means for detecting a luminance signal level of a pixel in an arbitrary hue region within the specific hue, and means for compressing the positive direction of the color correction signal to a blue video signal corresponding to the luminance signal for each pixel signal And having
    An image pickup apparatus that compresses a positive direction of a color correction signal to a blue video signal corresponding to a high luminance signal for each pixel signal.
  2. 2. The imaging apparatus according to claim 1, wherein the means for independently detecting and independently correcting the specific hue is a means for independently detecting and independently correcting the hue of 6 colors or 12 colors, and the 6 colors or 12 colors. Means for detecting the hue of before or after gamma and independently correcting a specific hue for each pixel before or after gamma,
    Detecting the hue of 6 or 12 colors before or after gamma, and independently correcting a specific hue for each pixel before or after gamma;
    An imaging apparatus that compresses the positive direction of a color correction signal to a blue video signal corresponding to a high luminance signal for each pixel signal.
  3. A specific hue is detected for each pixel of the red, green, and blue primary color image signals for each pixel signal generated from the color separation optical system and three or more image sensors, and the specific hue is corrected independently for each pixel. In an imaging apparatus having means,
    A color correction method for compressing a positive direction of a color correction signal to a blue video signal corresponding to a high luminance signal for each pixel signal.
PCT/JP2014/074520 2013-10-17 2014-09-17 Imaging device and color-correction method WO2015056514A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09247701A (en) * 1996-03-04 1997-09-19 Hitachi Denshi Ltd Color tone correction device
JP2001061160A (en) * 1999-08-24 2001-03-06 Matsushita Electric Ind Co Ltd Color correction device
JP2004032060A (en) * 2002-06-21 2004-01-29 Fuji Film Microdevices Co Ltd Color picture signal processing method and color image output arrangement as well as photographing equipment
JP2011254160A (en) * 2010-05-31 2011-12-15 Toshiba Corp Knee correction apparatus and knee correction method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09247701A (en) * 1996-03-04 1997-09-19 Hitachi Denshi Ltd Color tone correction device
JP2001061160A (en) * 1999-08-24 2001-03-06 Matsushita Electric Ind Co Ltd Color correction device
JP2004032060A (en) * 2002-06-21 2004-01-29 Fuji Film Microdevices Co Ltd Color picture signal processing method and color image output arrangement as well as photographing equipment
JP2011254160A (en) * 2010-05-31 2011-12-15 Toshiba Corp Knee correction apparatus and knee correction method

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