JP4392891B2 - Imaging apparatus and image processing method in the imaging apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an imaging apparatus such as a digital camera or a digital video, and an image processing method in the imaging apparatus.
[0002]
[Prior art]
In conventional single-plate digital cameras, there are few cameras capable of exchanging lenses, and almost all systems are integrated with a lens. For this reason, an optical low-pass filter, an IR cut filter, or the like is provided in advance in front of the CCD that generates an image signal by light that has passed through the lens, and has some effects on moire and false colors. However, in the case of a camera whose lens can be exchanged, the IR cut filter can be arranged in front of the CCD by forming a thin film on the glass surface of the CCD. However, if a space for arranging the optical low-pass filter in front of the CCD is provided, the size of the camera body is substantially increased. Also, by inserting such an optical low-pass filter, moire and false colors can be reduced to some extent, but there is a problem that the spatial frequency of the image is lowered, and as a result, the sharpness like silver halide photography is lost. End up. For these reasons, the importance of an optical system that does not include an optical low-pass filter is increasing.
[0003]
Even if such an optical low-pass filter is provided, in the case of a single-chip CCD digital camera, as represented by the Bayer array, R (red) and B (blue) with respect to G (green). The number of images is small, the color interval is wide, and false colors are generated when color interpolation is performed. In addition, as a conventional color interpolation method, there is a method of creating three color planes with a digital filter or the like, but the number of filter taps is limited by hardware, and the resolution of image data that is originally possessed can be sufficiently extracted. I couldn't.
[0004]
Therefore, conventionally, it has been proposed to obtain image data with high resolving power by performing image processing represented by US Pat. No. 5,373,322 and US Pat. No. 5,629,734, particularly color interpolation processing. These methods are not improved against moiré, but are said to be effective in reducing false colors.
[0005]
[Problems to be solved by the invention]
However, even if such a conventional method is employed, the false color at the time of color interpolation cannot be completely erased. This will be described below.
[0006]
First, as shown in FIG. 9, when vertical stripes of white lines are exposed on the G and R lines of the CCD at pixel pitch intervals, red (R) and yellow (Y ) (In FIG. 9, the hatched portion is black and the data is “0”). Similarly, as shown in FIG. 10, when white lines of vertical stripes are exposed on the green (G) and blue (B) lines of the CCD at the pixel pitch interval, blue (B) is obtained by the above color interpolation processing. And cyan (C) vertical stripes. 9 and 10, the same result is obtained with horizontal stripes instead of vertical stripes, and red (R), yellow (Y), or blue (B) and cyan (C) vertical stripe images are produced. .
[0007]
As another pattern, as shown in FIG. 11, when a white image such as a checker flag pattern is exposed with R and B of the CCD, an image of magenta (M) despite being white is obtained by the above color interpolation processing. Become. Similarly, as shown in FIG. 12, when a white image such as a checker flag pattern is exposed with G of the CCD, the color interpolation process results in a green (G) image even though it is white. .
[0008]
Therefore, in order to remove such false colors, the color space is converted from RGB to L * a * b * by an application program on the personal computer, and a * and b * are respectively filtered. By performing this process, the process for false colors is performed. However, in the case of the checker flag pattern shown in FIGS. 11 and 12, it cannot be distinguished from a green or magenta low-frequency image and cannot be identified as a false color. Moreover, if the band of the color difference frequency is forcibly limited even if it is compressed with JPEG as it is, the image becomes sleepy and the false color level is lowered, but the false color component spreads to surrounding pixels. There was a problem.
[0009]
The present invention has been made in view of the above conventional example, and an object thereof is to provide an imaging apparatus capable of reducing false colors generated by color interpolation processing and an image processing method in the imaging apparatus.
[0010]
It is another object of the present invention to provide an imaging apparatus that can prevent an increase in size and cost of the imaging apparatus and reduce false colors, and an image processing method in the imaging apparatus.
[0011]
Another object of the present invention is to provide an imaging apparatus capable of reducing false colors with a relatively simple configuration and an image processing method in the imaging apparatus.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the imaging apparatus of the present invention has the following configuration. That is,
An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Separating means for separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
Extraction means for extracting high-frequency components of the luminance signal separated by the separation means;
Determination means for determining whether a false color color range generated by the color interpolation means based on the hue signals obtained from the previous Kiirosa signal,
Means for reducing the color difference signal of the color range determined by the determining means in accordance with the magnitude of the high frequency component of the luminance signal extracted by the extracting means .
[0013]
In order to achieve the above object, the imaging apparatus of the present invention has the following configuration. That is,
An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Color space conversion means for converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
Detecting means for detecting a hue signal from a color difference signal of image data in the color space of the other color system;
Extracting means for extracting a high-frequency component of a luminance signal of image data in the color space of the other color system;
Determination means for determining whether the color range of a false color based on the color signal detected by the pre-Symbol detection means,
Of the color difference signals of the image data in the color space of the other color system, the color difference signal in the color range determined by the determination unit is determined according to the magnitude of the high frequency component of the luminance signal extracted by the extraction unit. And a means for lowering.
[0014]
In order to achieve the above object, an image processing method in an imaging apparatus of the present invention includes the following steps. That is,
An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A separation step of separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
An extraction step of extracting a high-frequency component of the luminance signal separated in the separation step;
A determination step of determining whether the false color color range generated by the color interpolation process on the basis of the hue signals obtained from the previous Kiirosa signal,
And a step of reducing the color difference signal in the color range determined in the determination step according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step .
[0015]
In order to achieve the above object, an image processing method in an imaging apparatus of the present invention includes the following steps. That is,
An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A color space conversion step of converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
A detection step of detecting a hue signal from a color difference signal of image data in the color space of the other color system;
An extraction step of extracting a high-frequency component of the luminance signal of the image data in the color space of the other color system;
A determination step of determining whether the false color color range based on the hue signal detected in the previous Symbol detection step,
Of the color difference signals of the image data in the color space of the other color system, the color difference signal in the color range determined in the determination step is determined according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step. characterized by a step of lowering Te.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Before describing the specific example according to the embodiment of the present invention, the feature according to the present embodiment will be described. To eliminate the false color described above, a three-plate camera in which a CCD is arranged for each color component of RGB Is ideal, but such a configuration increases the size of the camera itself. Therefore, paying attention to the fact that false colors from red (R) to yellow (Y) and blue (B) to cyan (C) have high frequencies, when the frequency component of luminance is high and the hue is within a predetermined range, By reducing the gain of the color difference signal, the generation of the false color is suppressed.
[0017]
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0018]
[Embodiment 1]
FIG. 1 is a block diagram mainly showing a configuration of an image processing circuit in the digital camera according to the first embodiment.
[0019]
The light 1 incident on the camera passes through the lens 2, the light amount is adjusted by the diaphragm 3, and is exposed to the CCD 5 for the time when the shutter (not shown) is open. Further, before the light 1 is exposed to the CCD 5, the frequency region (band) on the long wavelength side is cut by the IR filter 4 so that the CCD 5 does not detect light in the infrared region. The light 1 exposed to the CCD 5 is accumulated in the CCD 5 as a charge amount and is output as an electric signal. This electric signal is amplified to a predetermined gain by the CDS / AGC circuit 6 and converted to digital data by the A / D converter 7. The image data converted into the digital data is adjusted in RGB gain by the white balance circuit 8 and is generated in, for example, three color planes of RGB by the color interpolation circuit 9 as shown in FIG. Further, the image data represented by the RGB3 plane is adjusted by the masking processing circuit 10 regarding the RGB hue, and the gamma conversion circuit 11 performs processing necessary for displaying on the display or the like. Next, since the image data has a large number of data if it remains in the RGB3 plane, compression processing such as JPEG is performed.
[0020]
First, the RGB / YUV conversion circuit 12 converts the color space from RGB to Y color difference. This is done, for example, based on the following equation:
[0021]
Y = 0.29900 x R + 0.58700 x G + 0.11400 x B (1)
U = -0.16874 × R−0.33126 × G + 0.50000 × B (2)
V = 0.50000 x R-0.41869 x G-0.08131 x B (3)
Further, in order to detect a high frequency component and a hue of the RGB3 plane image obtained by the color interpolation circuit 9, first, the RGB / Y conversion circuit 17 calculates the luminance signal Y using the above equation (1). . Next, in order to detect the high-frequency component of the obtained luminance signal Y, a spatial high-pass filter operation as shown in FIG. 3 is performed by the spatial high-pass filter (HPF) 18. The luminance signal Y obtained by the RGB / Y conversion circuit 17 is sent to the hue detection circuit 19 to detect the hue, and the color difference signals RY and BY are calculated here. In FIG. 3, after the input signal is multiplied by the matrix 300, the subtractor 301 subtracts the input signal from the multiplication result, thereby performing a spatial high-pass filter operation.
[0022]
In the false color suppression circuit 13, the U of the color difference signal output from the RGB / YUV conversion circuit 12 is calculated from the high frequency component of the luminance signal Y obtained by the spatial high-pass filter 18 and the hue information obtained by the hue detection circuit 19. By reducing the gains of V and V, false colors are suppressed.
[0023]
This false color suppression process will be described with reference to FIGS.
[0024]
First, it is determined whether or not the color of the pixel of interest is within a predetermined range (region indicated by hatching in FIG. 5) in the Y, RY, and BY color space. If it is a color, the gain of the color difference signals U and V is lowered if it is greater than a certain value “of1” as shown in FIG. 4 in accordance with the value of the high frequency component of the luminance signal obtained by the spatial high-pass filter 18. As a result, false colors can be suppressed.
[0025]
The above configuration will be described. A high-frequency component such as a vertical stripe or a checker flag pattern as described with reference to FIGS. 9 to 12 is extracted by the space HPF 18, and the high-frequency region is described with reference to FIGS. 9 to 12. (For example, in the example of FIG. 9, in the predetermined region of the R and Y components, in the example of FIG. 10, in the predetermined region of the C and B components, in FIGS. 11 and 203, in the predetermined region of the R and B components, (These correspond to the shaded portions in FIG. 5) The gains of the color difference signals U and V are lowered to prevent the aforementioned false color from occurring.
[0026]
Next, a low-pass filter (LPF) 14a, 14b is applied with a low-pass filter in the horizontal or vertical direction, and Y: U: V = 4: 4: 4 to Y: U: V = 4: Color difference signals are thinned out according to a predetermined JPEG format such as 2: 2 or Y: U: V = 4: 1: 1. The JPEG circuit 16 performs JPEG compression. This makes it possible to create a compressed image with less false colors.
[0027]
In this case, when calculating the luminance signal Y, the above equation (1) is used, but a simple luminance signal Ye can also be used. For example,
Ye = R + 2 × G + B (4)
You may ask for.
[0028]
Moreover, it is also possible to employ | adopt as a luminance signal using a green (G) signal component, without calculating these luminance signals.
[0029]
FIG. 6 is a flowchart for explaining the false color removal process according to the first embodiment.
[0030]
In the figure, first, in step S1, the RGB signal after color interpolation processing is input, and a luminance component Y is generated from the RGB signal. In step S2, the spatial high-pass filter (HPF) 18 outputs the luminance signal Y. Extract high frequency components. In step S3, the difference between the RB signal and the luminance signal Y is taken to generate color difference signals RY and BY. In step S4, a hue signal is generated from the color difference signal, and it is determined whether or not the hue signal is in a color range that can be a false color. If the color is false in step S5, the process proceeds to step S6, and the gain of the color difference signal of the false color portion is reduced according to the amount of the high frequency component of the pixel. Thereby, for example, in a color space as shown in FIG. 5, false color components generated by color correction can be suppressed.
[0031]
As described above, according to the first embodiment, it is possible to prevent the occurrence of false colors from red to yellow and from blue to cyan.
[0032]
[Embodiment 2]
In the first embodiment described above, a means for detecting a false color is provided after the color interpolation circuit 9 and is performed using a signal that is an RGB3 plane. This is because the hue range of the false color to be detected may change because there are processing factors that change the hue such as masking processing and γ conversion after the color interpolation circuit 9. Therefore, the luminance signal Y is calculated to obtain the color difference signals RY and BY. However, the false color detection means is not limited to this position. For example, since JPEG compression requires conversion from RGB to a luminance and color difference color space, it is possible to detect false colors from these signals. The second embodiment relates to this. However, as described above, there is a possibility that the false color range may change depending on the image.
[0033]
FIG. 7 shows the configuration of the image processing unit of the digital camera according to Embodiment 2 of the present invention. In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0034]
The light 1 incident on the camera passes through the lens 2, the light amount is adjusted by the diaphragm 3, and is exposed to the CCD 5 for the time when the shutter (not shown) is open. Further, before the light 1 is exposed to the CCD 5, the region on the long wavelength side is cut by the IR filter 4 so that the CCD 5 does not detect light in the infrared region. The light exposed by the CCD 5 is accumulated as a charge amount in the CCD 5 and output as an electrical signal. After being amplified to a predetermined gain by the CDS / AGC circuit 6, it is converted into digital data by the A / D converter 7. The The image data thus converted into digital data is adjusted in RGB gain by the white balance circuit 8 and is generated in, for example, three color planes of RGB by the color interpolation circuit 9 as shown in FIG. The image data composed of the RGB3 plane is adjusted by the masking processing circuit 10 with respect to the hue of the RGB color, and the gamma conversion circuit 11 performs processing necessary for displaying on the display or the like. This image data is converted from RGB to a Y color difference color space by the RGB / YUV conversion circuit 12.
[0035]
Among these, the luminance signal Y is sent to the space HPF 18 in order to detect the high-frequency component and subjected to the filter operation as shown in FIG. 3, and the hue detection circuit 19 has a pixel of interest in the false color hue range. Judge whether or not. In this case, U and V output from the RGB / YUV conversion circuit 12 are used as shown in FIG. 8 instead of the color spaces RY and BY shown in FIG.
[0036]
Thus, as in the first embodiment, if the color of the pixel of interest falls within the false hue range, the false color suppression circuit 13 outputs the output to the spatial HPF 18 as shown in FIG. Accordingly, if the value is “of1” or more, the gains of U and V are lowered.
[0037]
At this time, for example, it may be necessary to change the hue range by white balance. For example, when the gain of red is increased, the hue range is shifted toward the red side or the hue angle is increased.
[0038]
Next, a low-pass filter is applied in the horizontal or vertical direction by the LPFs 14a and 14b. Next, the thinning circuit 15 changes the Y: U: V = 4: 4: 4 to a predetermined JPEG format such as Y: U: V = 4: 2: 2 or Y: U: V = 4: 1: 1. Accordingly, the color difference signal is thinned out and JPEG compression is performed by JPEG16.
[0039]
This makes it possible to create a compressed image with less false colors.
[0040]
Note that the present invention can be applied to a system (for example, a copier, a facsimile machine, etc.) composed of a single device even if it is applied to a system composed of a plurality of devices (for example, host computer, interface device, reader, printer, etc.). You may apply.
[0041]
Another object of the present invention is to supply a storage medium (or recording medium) in which a program code of software that realizes the functions of the above-described embodiments is recorded to a system or apparatus, and the computer (or CPU or CPU) of the system or apparatus. (MPU) can also be achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. A case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing is also included.
[0042]
Furthermore, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the program code. This includes a case where the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0043]
As described above, according to the present embodiment, the color interpolation is performed by detecting the high-frequency component of the luminance signal and the hue from red to yellow and from blue to cyan, and reducing the gains of the equation difference signals U and V. Can suppress false colors generated in
[0044]
【The invention's effect】
As described above, according to the present invention, false colors generated by color interpolation processing can be reduced.
[0045]
In addition, according to the present invention, it is possible to reduce the false color by preventing an increase in the size and cost of the imaging apparatus.
[0046]
Moreover, according to the present invention, there is an effect that false colors can be reduced with a relatively simple configuration.
[0047]
In the present invention, the hue is obtained after the RGB color space is divided into the luminance signal and the color difference signal, but the present invention is not necessarily limited thereto. For example, in the RGB color space, a hue signal can be obtained by calculating (R / G) / (B / G).
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an image processing unit of a digital camera according to Embodiment 1 of the present invention.
FIG. 2 is a conceptual diagram for explaining color interpolation according to the present embodiment;
FIG. 3 is a block diagram showing a configuration of a high frequency filter in the present embodiment.
FIG. 4 is a graph illustrating processing in a false color suppression unit according to the present embodiment.
FIG. 5 is a diagram illustrating an example of a false color hue range in false color suppression according to the present embodiment;
FIG. 6 is a flowchart illustrating false color suppression processing according to the present embodiment.
FIG. 7 is a block diagram showing a configuration of an image processing unit of a digital camera according to Embodiment 2 of the present invention.
FIG. 8 is a diagram illustrating an example of a false color hue range in false color suppression according to the second embodiment;
FIG. 9 is a conceptual diagram illustrating a general false color generation process.
FIG. 10 is a conceptual diagram illustrating a general false color generation process.
FIG. 11 is a conceptual diagram illustrating a general false color generation process.
FIG. 12 is a conceptual diagram illustrating a general false color generation process.

Claims (30)

An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Separating means for separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
Extraction means for extracting high-frequency components of the luminance signal separated by the separation means;
Determination means for determining whether a false color color range generated by the color interpolation means based on the hue signals obtained from the previous Kiirosa signal,
Means for reducing the color difference signal of the color range determined by the determination means according to the magnitude of the high-frequency component of the luminance signal extracted by the extraction means ;
An imaging device comprising:   The imaging apparatus according to claim 1, wherein the separation unit separates the image data into a Y signal as the luminance signal and an RY signal and a BY signal as the color difference signal. An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Color space conversion means for converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
Detecting means for detecting a hue signal from a color difference signal of image data in the color space of the other color system;
Extracting means for extracting a high-frequency component of a luminance signal of image data in the color space of the other color system;
Determination means for determining whether the color range of a false color based on the color signal detected by the pre-Symbol detection means,
Of the color difference signals of the image data in the color space of the other color system, the color difference signal in the color range determined by the determination unit is determined according to the magnitude of the high frequency component of the luminance signal extracted by the extraction unit. Means to lower
An imaging device comprising:   The imaging apparatus according to claim 3, wherein the color space conversion unit converts the image data into a YUV color space.   4. The imaging apparatus according to claim 1, further comprising a low-frequency pass filter unit that removes a high-frequency component in the color signal from which the false color is removed.   The imaging apparatus according to claim 1, wherein the false color range includes a color region including red to yellow and a color region including blue to cyan. An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A separation step of separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
An extraction step of extracting a high-frequency component of the luminance signal separated in the separation step;
A determination step of determining whether the false color color range generated by the color interpolation process on the basis of the hue signals obtained from the previous Kiirosa signal,
Reducing the color difference signal of the color range determined in the determination step according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step ;
An image processing method in an imaging apparatus, comprising: An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A color space conversion step of converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
A detection step of detecting a hue signal from a color difference signal of image data in the color space of the other color system;
An extraction step of extracting a high-frequency component of the luminance signal of the image data in the color space of the other color system;
A determination step of determining whether the false color color range based on the hue signal detected in the previous Symbol detection step,
Of the color difference signals of the image data in the color space of the different color system, the color difference signal in the color range determined in the determination step is determined according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step. a step of lowering Te,
An image processing method in an imaging apparatus, comprising:   The image processing method according to claim 7, wherein the separation step separates the image data into a Y signal, an RY signal, and a BY signal.   The image processing method according to claim 9, wherein in the color space conversion step, the image data is converted into a YUV color space.   The image processing method according to claim 8, further comprising a step of removing a high-frequency component in the color signal from which the false color is removed.   The image processing method according to claim 7 or 8, wherein the false color range includes a color region including red to yellow and a color region including blue to cyan. An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Separating means for separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
Extraction means for extracting high-frequency components of the luminance signal separated by the separation means;
A determination unit for determining a color range of a false color generated by the color interpolation unit based on a hue signal obtained from the color difference signal separated by the separation unit;
Among the color difference signals obtained by color space conversion of the image data of the plurality of color planes, the magnitude of the high frequency component of the luminance signal extracted by the extraction means is the color difference signal in the color range determined by the determination means. Suppression means to reduce according to,
An imaging device comprising:   The separation unit separates the image data into a Y signal, an RY signal, and a BY signal, and the suppression unit has a color range of the U and V signals obtained by the color space conversion. The imaging apparatus according to claim 13, wherein the U and V signals are reduced in accordance with a magnitude of a high frequency component of the Y signal. An image sensor;
An imaging means for forming an image on the image sensor;
A / D conversion means for converting an image signal output from the image sensor into a digital signal;
Color interpolation means for color-interpolating the digital signal converted by the A / D conversion means to create image data of a plurality of color planes;
Color space conversion means for converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
Detecting means for detecting a hue signal from a color difference signal of image data in the color space of the other color system;
Extracting means for extracting a high-frequency component of a luminance signal of image data in the color space of the other color system;
Determination means for determining a false color range based on the hue signal detected by the detection means;
The color difference signal in the color range determined by the determination unit among the color difference signals of the image data in the color space of the other color system is reduced according to the magnitude of the high frequency component of the luminance signal extracted by the extraction unit. Repression means,
An imaging device comprising:   16. The imaging apparatus according to claim 15, wherein the color space conversion unit converts the image data into a YUV color space. An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A separation step of separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
An extraction step of extracting a high-frequency component of the luminance signal separated in the separation step;
A determination step of determining a false color range generated in the color interpolation step based on a hue signal obtained from the color difference signal separated in the separation step;
Among the color difference signals obtained by color space conversion of the image data of the plurality of color planes, the color difference signal in the color range determined in the determination step is the magnitude of the high frequency component of the luminance signal extracted in the extraction step A suppression process that decreases according to
An image processing method in an imaging apparatus, comprising: An image processing method in an imaging apparatus having an imaging device and generating an image signal corresponding to a video imaged on the imaging device,
An A / D conversion step of converting an image signal output from the image sensor into a digital signal;
A color interpolation step of color-interpolating the digital signal converted in the A / D conversion step to create image data of a plurality of color planes;
A color space conversion step of converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
A detection step of detecting and separating a hue signal from a color difference signal of image data in the color space of the other color system;
An extraction step of extracting a high-frequency component of the luminance signal of the image data in the color space of the other color system;
A determination step of determining a false color range based on the hue signal detected in the detection step;
The color difference signal in the color range determined in the determination step among the color difference signals of the image data in the color space of the other color system is reduced according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step. The suppression process
An image processing method in an imaging apparatus, comprising:   In the separation step, the image data is separated into a Y signal, an RY signal, and a BY signal, and in the suppression step, the U and V signals obtained by the color space conversion are included in the color range. 18. The image processing method according to claim 17, wherein the U and V signals are reduced according to the magnitude of the high frequency component of the Y signal.   19. The image processing method according to claim 18, wherein in the color space conversion step, the image data is converted into a YUV color space. Imaging device, imaging means for forming an image on the imaging device, A / D conversion means for converting an image signal output from the imaging element into a digital signal, and conversion by the A / D conversion means An image processing method for processing the image data of the plurality of color planes generated by the imaging device, and color interpolation means for color-interpolating the digital signal thus generated and generating image data of the plurality of color planes,
A separation step of separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
An extraction step of extracting a high-frequency component of the luminance signal separated in the separation step;
A determination step of determining whether a color range of a false color generated in the color interpolation step based on a hue signal obtained from the color difference signal;
Reducing the color difference signal of the color range determined in the determination step according to the magnitude of the high frequency component of the luminance signal extracted in the extraction step;
An image processing method comprising: Imaging device, imaging means for forming an image on the imaging device, A / D conversion means for converting an image signal output from the imaging element into a digital signal, and conversion by the A / D conversion means An image processing method for processing the image data of the plurality of color planes generated by the imaging device, and color interpolation means for color-interpolating the digital signal thus generated and generating image data of the plurality of color planes,
A color space conversion step of converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
A detection step of detecting a hue signal from a color difference signal of image data in the color space of the other color system;
An extraction step of extracting a high-frequency component of the luminance signal of the image data in the color space of the other color system;
A determination step of determining whether the color range is a false color based on the hue signal detected in the detection step;
Among the color difference signals of the image data in the color space of the other color system, the color difference signal in the color range determined in the determination step is set to the magnitude of the high frequency component of the luminance signal extracted in the extraction step. A step of lowering accordingly,
An image processing method comprising: The image processing method according to claim 21, wherein the separation step separates the image data into a Y signal, an RY signal, and a BY signal. The image processing method according to claim 22, wherein the color space conversion step converts the image data into a YUV color space. The image processing method according to claim 22, further comprising a step of removing a high-frequency component in the color signal from which the false color is removed. The image processing method according to claim 21 or 22, wherein the false color range includes a color region including red to yellow and a color region including blue to cyan. Imaging device, imaging means for forming an image on the imaging device, A / D conversion means for converting an image signal output from the imaging element into a digital signal, and conversion by the A / D conversion means An image processing method for processing the image data of the plurality of color planes generated by the imaging device, and color interpolation means for color-interpolating the digital signal thus generated and generating image data of the plurality of color planes,
A separation step of separating the image data of the plurality of color planes into a luminance signal and a color difference signal;
An extraction step of extracting a high-frequency component of the luminance signal separated in the separation step;
A determination step of determining a false color range generated in the color interpolation step based on a hue signal obtained from the color difference signal separated in the separation step;
Among the color difference signals obtained by performing color space conversion on the image data of the plurality of color planes, the color difference signals in the color range determined in the determination step are converted into high-frequency components of the luminance signal extracted in the extraction step. A suppression process that decreases according to the size,
An image processing method comprising: Imaging device, imaging means for forming an image on the imaging device, A / D conversion means for converting an image signal output from the imaging element into a digital signal, and conversion by the A / D conversion means An image processing method for processing the image data of the plurality of color planes generated by the imaging device, and color interpolation means for color-interpolating the digital signal thus generated and generating image data of the plurality of color planes,
A color space conversion step of converting a color space of the plurality of color planes into a color space of another color system and outputting a luminance signal and a color difference signal;
A detection step of detecting a hue signal from a color difference signal of image data in the color space of the other color system;
An extraction step of extracting a high-frequency component of the luminance signal of the image data in the color space of the other color system;
A determination step of determining a false color range based on the hue signal detected in the detection step;
According to the magnitude of the high frequency component of the luminance signal extracted in the extraction step, the color difference signal in the color range determined in the determination step among the color difference signals of the image data in the color space of the other color system The suppression process to be reduced,
An image processing method comprising: The separation step separates the image data into a Y signal, an RY signal, and a BY signal, and the suppression step includes a U of the color range among the U and V signals obtained by the color space conversion. 28. The image processing method according to claim 27, wherein the V signal and the V signal are reduced in accordance with a magnitude of a high frequency component of the Y signal. 29. The image processing method according to claim 28, wherein in the color space conversion step, the image data is converted into a YUV color space.

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