列挙型
enum	cv::ColorConversionCodes { cv::COLOR_BGR2BGRA = 0 , COLOR_RGB2RGBA = COLOR_BGR2BGRA , cv::COLOR_BGRA2BGR = 1 , COLOR_RGBA2RGB = COLOR_BGRA2BGR , cv::COLOR_BGR2RGBA = 2 , COLOR_RGB2BGRA = COLOR_BGR2RGBA , COLOR_RGBA2BGR = 3 , COLOR_BGRA2RGB = COLOR_RGBA2BGR , COLOR_BGR2RGB = 4 , COLOR_RGB2BGR = COLOR_BGR2RGB , COLOR_BGRA2RGBA = 5 , COLOR_RGBA2BGRA = COLOR_BGRA2RGBA , cv::COLOR_BGR2GRAY = 6 , COLOR_RGB2GRAY = 7 , COLOR_GRAY2BGR = 8 , COLOR_GRAY2RGB = COLOR_GRAY2BGR , COLOR_GRAY2BGRA = 9 , COLOR_GRAY2RGBA = COLOR_GRAY2BGRA , COLOR_BGRA2GRAY = 10 , COLOR_RGBA2GRAY = 11 , cv::COLOR_BGR2BGR565 = 12 , COLOR_RGB2BGR565 = 13 , COLOR_BGR5652BGR = 14 , COLOR_BGR5652RGB = 15 , COLOR_BGRA2BGR565 = 16 , COLOR_RGBA2BGR565 = 17 , COLOR_BGR5652BGRA = 18 , COLOR_BGR5652RGBA = 19 , cv::COLOR_GRAY2BGR565 = 20 , COLOR_BGR5652GRAY = 21 , cv::COLOR_BGR2BGR555 = 22 , COLOR_RGB2BGR555 = 23 , COLOR_BGR5552BGR = 24 , COLOR_BGR5552RGB = 25 , COLOR_BGRA2BGR555 = 26 , COLOR_RGBA2BGR555 = 27 , COLOR_BGR5552BGRA = 28 , COLOR_BGR5552RGBA = 29 , cv::COLOR_GRAY2BGR555 = 30 , COLOR_BGR5552GRAY = 31 , cv::COLOR_BGR2XYZ = 32 , COLOR_RGB2XYZ = 33 , COLOR_XYZ2BGR = 34 , COLOR_XYZ2RGB = 35 , cv::COLOR_BGR2YCrCb = 36 , COLOR_RGB2YCrCb = 37 , COLOR_YCrCb2BGR = 38 , COLOR_YCrCb2RGB = 39 , cv::COLOR_BGR2HSV = 40 , COLOR_RGB2HSV = 41 , cv::COLOR_BGR2Lab = 44 , COLOR_RGB2Lab = 45 , cv::COLOR_BGR2Luv = 50 , COLOR_RGB2Luv = 51 , cv::COLOR_BGR2HLS = 52 , COLOR_RGB2HLS = 53 , cv::COLOR_HSV2BGR = 54 , COLOR_HSV2RGB = 55 , COLOR_Lab2BGR = 56 , COLOR_Lab2RGB = 57 , COLOR_Luv2BGR = 58 , COLOR_Luv2RGB = 59 , cv::COLOR_HLS2BGR = 60 , COLOR_HLS2RGB = 61 , cv::COLOR_BGR2HSV_FULL = 66 , COLOR_RGB2HSV_FULL = 67 , cv::COLOR_BGR2HLS_FULL = 68 , COLOR_RGB2HLS_FULL = 69 , cv::COLOR_HSV2BGR_FULL = 70 , COLOR_HSV2RGB_FULL = 71 , cv::COLOR_HLS2BGR_FULL = 72 , COLOR_HLS2RGB_FULL = 73 , COLOR_LBGR2Lab = 74 , COLOR_LRGB2Lab = 75 , COLOR_LBGR2Luv = 76 , COLOR_LRGB2Luv = 77 , COLOR_Lab2LBGR = 78 , COLOR_Lab2LRGB = 79 , COLOR_Luv2LBGR = 80 , COLOR_Luv2LRGB = 81 , cv::COLOR_BGR2YUV = 82 , COLOR_RGB2YUV = 83 , COLOR_YUV2BGR = 84 , COLOR_YUV2RGB = 85 , cv::COLOR_YUV2RGB_NV12 = 90 , COLOR_YUV2BGR_NV12 = 91 , COLOR_YUV2RGB_NV21 = 92 , COLOR_YUV2BGR_NV21 = 93 , COLOR_YUV420sp2RGB = COLOR_YUV2RGB_NV21 , COLOR_YUV420sp2BGR = COLOR_YUV2BGR_NV21 , COLOR_YUV2RGBA_NV12 = 94 , COLOR_YUV2BGRA_NV12 = 95 , COLOR_YUV2RGBA_NV21 = 96 , COLOR_YUV2BGRA_NV21 = 97 , COLOR_YUV420sp2RGBA = COLOR_YUV2RGBA_NV21 , COLOR_YUV420sp2BGRA = COLOR_YUV2BGRA_NV21 , COLOR_YUV2RGB_YV12 = 98 , COLOR_YUV2BGR_YV12 = 99 , COLOR_YUV2RGB_IYUV = 100 , COLOR_YUV2BGR_IYUV = 101 , COLOR_YUV2RGB_I420 = COLOR_YUV2RGB_IYUV , COLOR_YUV2BGR_I420 = COLOR_YUV2BGR_IYUV , COLOR_YUV420p2RGB = COLOR_YUV2RGB_YV12 , COLOR_YUV420p2BGR = COLOR_YUV2BGR_YV12 , COLOR_YUV2RGBA_YV12 = 102 , COLOR_YUV2BGRA_YV12 = 103 , COLOR_YUV2RGBA_IYUV = 104 , COLOR_YUV2BGRA_IYUV = 105 , COLOR_YUV2RGBA_I420 = COLOR_YUV2RGBA_IYUV , COLOR_YUV2BGRA_I420 = COLOR_YUV2BGRA_IYUV , COLOR_YUV420p2RGBA = COLOR_YUV2RGBA_YV12 , COLOR_YUV420p2BGRA = COLOR_YUV2BGRA_YV12 , COLOR_YUV2GRAY_420 = 106 , COLOR_YUV2GRAY_NV21 = COLOR_YUV2GRAY_420 , COLOR_YUV2GRAY_NV12 = COLOR_YUV2GRAY_420 , COLOR_YUV2GRAY_YV12 = COLOR_YUV2GRAY_420 , COLOR_YUV2GRAY_IYUV = COLOR_YUV2GRAY_420 , COLOR_YUV2GRAY_I420 = COLOR_YUV2GRAY_420 , COLOR_YUV420sp2GRAY = COLOR_YUV2GRAY_420 , COLOR_YUV420p2GRAY = COLOR_YUV2GRAY_420 , cv::COLOR_YUV2RGB_UYVY = 107 , COLOR_YUV2BGR_UYVY = 108 , COLOR_YUV2RGB_Y422 = COLOR_YUV2RGB_UYVY , COLOR_YUV2BGR_Y422 = COLOR_YUV2BGR_UYVY , COLOR_YUV2RGB_UYNV = COLOR_YUV2RGB_UYVY , COLOR_YUV2BGR_UYNV = COLOR_YUV2BGR_UYVY , COLOR_YUV2RGBA_UYVY = 111 , COLOR_YUV2BGRA_UYVY = 112 , COLOR_YUV2RGBA_Y422 = COLOR_YUV2RGBA_UYVY , COLOR_YUV2BGRA_Y422 = COLOR_YUV2BGRA_UYVY , COLOR_YUV2RGBA_UYNV = COLOR_YUV2RGBA_UYVY , COLOR_YUV2BGRA_UYNV = COLOR_YUV2BGRA_UYVY , COLOR_YUV2RGB_YUY2 = 115 , COLOR_YUV2BGR_YUY2 = 116 , COLOR_YUV2RGB_YVYU = 117 , COLOR_YUV2BGR_YVYU = 118 , COLOR_YUV2RGB_YUYV = COLOR_YUV2RGB_YUY2 , COLOR_YUV2BGR_YUYV = COLOR_YUV2BGR_YUY2 , COLOR_YUV2RGB_YUNV = COLOR_YUV2RGB_YUY2 , COLOR_YUV2BGR_YUNV = COLOR_YUV2BGR_YUY2 , COLOR_YUV2RGBA_YUY2 = 119 , COLOR_YUV2BGRA_YUY2 = 120 , COLOR_YUV2RGBA_YVYU = 121 , COLOR_YUV2BGRA_YVYU = 122 , COLOR_YUV2RGBA_YUYV = COLOR_YUV2RGBA_YUY2 , COLOR_YUV2BGRA_YUYV = COLOR_YUV2BGRA_YUY2 , COLOR_YUV2RGBA_YUNV = COLOR_YUV2RGBA_YUY2 , COLOR_YUV2BGRA_YUNV = COLOR_YUV2BGRA_YUY2 , COLOR_YUV2GRAY_UYVY = 123 , COLOR_YUV2GRAY_YUY2 = 124 , COLOR_YUV2GRAY_Y422 = COLOR_YUV2GRAY_UYVY , COLOR_YUV2GRAY_UYNV = COLOR_YUV2GRAY_UYVY , COLOR_YUV2GRAY_YVYU = COLOR_YUV2GRAY_YUY2 , COLOR_YUV2GRAY_YUYV = COLOR_YUV2GRAY_YUY2 , COLOR_YUV2GRAY_YUNV = COLOR_YUV2GRAY_YUY2 , cv::COLOR_RGBA2mRGBA = 125 , COLOR_mRGBA2RGBA = 126 , cv::COLOR_RGB2YUV_I420 = 127 , COLOR_BGR2YUV_I420 = 128 , COLOR_RGB2YUV_IYUV = COLOR_RGB2YUV_I420 , COLOR_BGR2YUV_IYUV = COLOR_BGR2YUV_I420 , COLOR_RGBA2YUV_I420 = 129 , COLOR_BGRA2YUV_I420 = 130 , COLOR_RGBA2YUV_IYUV = COLOR_RGBA2YUV_I420 , COLOR_BGRA2YUV_IYUV = COLOR_BGRA2YUV_I420 , COLOR_RGB2YUV_YV12 = 131 , COLOR_BGR2YUV_YV12 = 132 , COLOR_RGBA2YUV_YV12 = 133 , COLOR_BGRA2YUV_YV12 = 134 , cv::COLOR_BayerBG2BGR = 46 , COLOR_BayerGB2BGR = 47 , COLOR_BayerRG2BGR = 48 , COLOR_BayerGR2BGR = 49 , COLOR_BayerBG2RGB = COLOR_BayerRG2BGR , COLOR_BayerGB2RGB = COLOR_BayerGR2BGR , COLOR_BayerRG2RGB = COLOR_BayerBG2BGR , COLOR_BayerGR2RGB = COLOR_BayerGB2BGR , COLOR_BayerBG2GRAY = 86 , COLOR_BayerGB2GRAY = 87 , COLOR_BayerRG2GRAY = 88 , COLOR_BayerGR2GRAY = 89 , cv::COLOR_BayerBG2BGR_VNG = 62 , COLOR_BayerGB2BGR_VNG = 63 , COLOR_BayerRG2BGR_VNG = 64 , COLOR_BayerGR2BGR_VNG = 65 , COLOR_BayerBG2RGB_VNG = COLOR_BayerRG2BGR_VNG , COLOR_BayerGB2RGB_VNG = COLOR_BayerGR2BGR_VNG , COLOR_BayerRG2RGB_VNG = COLOR_BayerBG2BGR_VNG , COLOR_BayerGR2RGB_VNG = COLOR_BayerGB2BGR_VNG , cv::COLOR_BayerBG2BGR_EA = 135 , COLOR_BayerGB2BGR_EA = 136 , COLOR_BayerRG2BGR_EA = 137 , COLOR_BayerGR2BGR_EA = 138 , COLOR_BayerBG2RGB_EA = COLOR_BayerRG2BGR_EA , COLOR_BayerGB2RGB_EA = COLOR_BayerGR2BGR_EA , COLOR_BayerRG2RGB_EA = COLOR_BayerBG2BGR_EA , COLOR_BayerGR2RGB_EA = COLOR_BayerGB2BGR_EA , cv::COLOR_BayerBG2BGRA = 139 , COLOR_BayerGB2BGRA = 140 , COLOR_BayerRG2BGRA = 141 , COLOR_BayerGR2BGRA = 142 , COLOR_BayerBG2RGBA = COLOR_BayerRG2BGRA , COLOR_BayerGB2RGBA = COLOR_BayerGR2BGRA , COLOR_BayerRG2RGBA = COLOR_BayerBG2BGRA , COLOR_BayerGR2RGBA = COLOR_BayerGB2BGRA , COLOR_COLORCVT_MAX = 143 }

関数
CV_EXPORTS_W void	cv::cvtColor (InputArray src, OutputArray dst, int code, int dstCn=0)
	Converts an image from one color space to another. [詳解]

CV_EXPORTS_W void	cv::cvtColorTwoPlane (InputArray src1, InputArray src2, OutputArray dst, int code)
	Converts an image from one color space to another where the source image is stored in two planes. [詳解]

CV_EXPORTS_W void	cv::demosaicing (InputArray src, OutputArray dst, int code, int dstCn=0)
	main function for all demosaicing processes [詳解]

詳解

列挙型詳解

◆ ColorConversionCodes

enum cv::ColorConversionCodes

the color conversion codes

参照: Imgproc_color_conversions

列挙値
COLOR_BGR2BGRA	add alpha channel to RGB or BGR image
COLOR_BGRA2BGR	remove alpha channel from RGB or BGR image
COLOR_BGR2RGBA	convert between RGB and BGR color spaces (with or without alpha channel)
COLOR_BGR2GRAY	convert between RGB/BGR and grayscale, color conversions
COLOR_BGR2BGR565	convert between RGB/BGR and BGR565 (16-bit images)
COLOR_GRAY2BGR565	convert between grayscale to BGR565 (16-bit images)
COLOR_BGR2BGR555	convert between RGB/BGR and BGR555 (16-bit images)
COLOR_GRAY2BGR555	convert between grayscale and BGR555 (16-bit images)
COLOR_BGR2XYZ	convert RGB/BGR to CIE XYZ, color conversions
COLOR_BGR2YCrCb	convert RGB/BGR to luma-chroma (aka YCC), color conversions
COLOR_BGR2HSV	convert RGB/BGR to HSV (hue saturation value) with H range 0..180 if 8 bit image, color conversions
COLOR_BGR2Lab	convert RGB/BGR to CIE Lab, color conversions
COLOR_BGR2Luv	convert RGB/BGR to CIE Luv, color conversions
COLOR_BGR2HLS	convert RGB/BGR to HLS (hue lightness saturation) with H range 0..180 if 8 bit image, color conversions
COLOR_HSV2BGR	backward conversions HSV to RGB/BGR with H range 0..180 if 8 bit image
COLOR_HLS2BGR	backward conversions HLS to RGB/BGR with H range 0..180 if 8 bit image
COLOR_BGR2HSV_FULL	convert RGB/BGR to HSV (hue saturation value) with H range 0..255 if 8 bit image, color conversions
COLOR_BGR2HLS_FULL	convert RGB/BGR to HLS (hue lightness saturation) with H range 0..255 if 8 bit image, color conversions
COLOR_HSV2BGR_FULL	backward conversions HSV to RGB/BGR with H range 0..255 if 8 bit image
COLOR_HLS2BGR_FULL	backward conversions HLS to RGB/BGR with H range 0..255 if 8 bit image
COLOR_BGR2YUV	convert between RGB/BGR and YUV
COLOR_YUV2RGB_NV12	YUV 4:2:0 family to RGB
COLOR_YUV2RGB_UYVY	YUV 4:2:2 family to RGB
COLOR_RGBA2mRGBA	alpha premultiplication
COLOR_RGB2YUV_I420	RGB to YUV 4:2:0 family
COLOR_BayerBG2BGR	Demosaicing
COLOR_BayerBG2BGR_VNG	Demosaicing using Variable Number of Gradients
COLOR_BayerBG2BGR_EA	Edge-Aware Demosaicing
COLOR_BayerBG2BGRA	Demosaicing with alpha channel

関数詳解

◆ cvtColor()

CV_EXPORTS_W void cv::cvtColor	(	InputArray	src,
		OutputArray	dst,
		int	code,
		int	dstCn = `0`
	)

Converts an image from one color space to another.

The function converts an input image from one color space to another. In case of a transformation to-from RGB color space, the order of the channels should be specified explicitly (RGB or BGR). Note that the default color format in OpenCV is often referred to as RGB but it is actually BGR (the bytes are reversed). So the first byte in a standard (24-bit) color image will be an 8-bit Blue component, the second byte will be Green, and the third byte will be Red. The fourth, fifth, and sixth bytes would then be the second pixel (Blue, then Green, then Red), and so on.

The conventional ranges for R, G, and B channel values are:

0 to 255 for CV_8U images
0 to 65535 for CV_16U images
0 to 1 for CV_32F images

In case of linear transformations, the range does not matter. But in case of a non-linear transformation, an input RGB image should be normalized to the proper value range to get the correct results, for example, for RGB $\rightarrow$ L*u*v* transformation. For example, if you have a 32-bit floating-point image directly converted from an 8-bit image without any scaling, then it will have the 0..255 value range instead of 0..1 assumed by the function. So, before calling cvtColor , you need first to scale the image down:

img *= 1./255;

cvtColor(img, img, COLOR_BGR2Luv);

cv::cvtColor

CV_EXPORTS_W void cvtColor(InputArray src, OutputArray dst, int code, int dstCn=0)

Converts an image from one color space to another.

cv::COLOR_BGR2Luv

@ COLOR_BGR2Luv

convert RGB/BGR to CIE Luv, color conversions

Definition: imgproc.hpp:600

If you use cvtColor with 8-bit images, the conversion will have some information lost. For many applications, this will not be noticeable but it is recommended to use 32-bit images in applications that need the full range of colors or that convert an image before an operation and then convert back.

If conversion adds the alpha channel, its value will set to the maximum of corresponding channel range: 255 for CV_8U, 65535 for CV_16U, 1 for CV_32F.

引数

src	input image: 8-bit unsigned, 16-bit unsigned ( CV_16UC... ), or single-precision floating-point.
dst	output image of the same size and depth as src.
code	color space conversion code (see ColorConversionCodes).
dstCn	number of channels in the destination image; if the parameter is 0, the number of the channels is derived automatically from src and code.

参照: Imgproc_color_conversions

◆ cvtColorTwoPlane()

CV_EXPORTS_W void cv::cvtColorTwoPlane	(	InputArray	src1,
		InputArray	src2,
		OutputArray	dst,
		int	code
	)

Converts an image from one color space to another where the source image is stored in two planes.

This function only supports YUV420 to RGB conversion as of now.

引数

src1	8-bit image (#CV_8U) of the Y plane.
src2	image containing interleaved U/V plane.
dst	output image.
code	Specifies the type of conversion. It can take any of the following values: #COLOR_YUV2BGR_NV12 COLOR_YUV2RGB_NV12 #COLOR_YUV2BGRA_NV12 #COLOR_YUV2RGBA_NV12 #COLOR_YUV2BGR_NV21 #COLOR_YUV2RGB_NV21 #COLOR_YUV2BGRA_NV21 #COLOR_YUV2RGBA_NV21

◆ demosaicing()

CV_EXPORTS_W void cv::demosaicing	(	InputArray	src,
		OutputArray	dst,
		int	code,
		int	dstCn = `0`
	)

main function for all demosaicing processes

引数

src	input image: 8-bit unsigned or 16-bit unsigned.
dst	output image of the same size and depth as src.
code	Color space conversion code (see the description below).
dstCn	number of channels in the destination image; if the parameter is 0, the number of the channels is derived automatically from src and code.

The function can do the following transformations:

Demosaicing using bilinear interpolation

COLOR_BayerBG2BGR , #COLOR_BayerGB2BGR , #COLOR_BayerRG2BGR , #COLOR_BayerGR2BGR

#COLOR_BayerBG2GRAY , #COLOR_BayerGB2GRAY , #COLOR_BayerRG2GRAY , #COLOR_BayerGR2GRAY
Demosaicing using Variable Number of Gradients.

COLOR_BayerBG2BGR_VNG , #COLOR_BayerGB2BGR_VNG , #COLOR_BayerRG2BGR_VNG , #COLOR_BayerGR2BGR_VNG
Edge-Aware Demosaicing.

COLOR_BayerBG2BGR_EA , #COLOR_BayerGB2BGR_EA , #COLOR_BayerRG2BGR_EA , #COLOR_BayerGR2BGR_EA
Demosaicing with alpha channel

COLOR_BayerBG2BGRA , #COLOR_BayerGB2BGRA , #COLOR_BayerRG2BGRA , #COLOR_BayerGR2BGRA

参照: cvtColor