Color space processing

Enumerations
enum	cv::cuda::AlphaCompTypes {   cv::cuda::ALPHA_OVER,   cv::cuda::ALPHA_IN,   cv::cuda::ALPHA_OUT,   cv::cuda::ALPHA_ATOP,   cv::cuda::ALPHA_XOR,   cv::cuda::ALPHA_PLUS,   cv::cuda::ALPHA_OVER_PREMUL,   cv::cuda::ALPHA_IN_PREMUL,   cv::cuda::ALPHA_OUT_PREMUL,   cv::cuda::ALPHA_ATOP_PREMUL,   cv::cuda::ALPHA_XOR_PREMUL,   cv::cuda::ALPHA_PLUS_PREMUL,   cv::cuda::ALPHA_PREMUL }
enum	cv::cuda::DemosaicTypes {   cv::cuda::COLOR_BayerBG2BGR_MHT = 256,   cv::cuda::COLOR_BayerGB2BGR_MHT = 257,   cv::cuda::COLOR_BayerRG2BGR_MHT = 258,   cv::cuda::COLOR_BayerGR2BGR_MHT = 259,   cv::cuda::COLOR_BayerBG2RGB_MHT = COLOR_BayerRG2BGR_MHT,   cv::cuda::COLOR_BayerGB2RGB_MHT = COLOR_BayerGR2BGR_MHT,   cv::cuda::COLOR_BayerRG2RGB_MHT = COLOR_BayerBG2BGR_MHT,   cv::cuda::COLOR_BayerGR2RGB_MHT = COLOR_BayerGB2BGR_MHT,   cv::cuda::COLOR_BayerBG2GRAY_MHT = 260,   cv::cuda::COLOR_BayerGB2GRAY_MHT = 261,   cv::cuda::COLOR_BayerRG2GRAY_MHT = 262,   cv::cuda::COLOR_BayerGR2GRAY_MHT = 263 }

Functions
void	cv::cuda::alphaComp (InputArray img1, InputArray img2, OutputArray dst, int alpha_op, Stream &stream=Stream::Null())
	Composites two images using alpha opacity values contained in each image. More...
void	cv::cuda::cvtColor (InputArray src, OutputArray dst, int code, int dcn=0, Stream &stream=Stream::Null())
	Converts an image from one color space to another. More...
void	cv::cuda::demosaicing (InputArray src, OutputArray dst, int code, int dcn=-1, Stream &stream=Stream::Null())
	Converts an image from Bayer pattern to RGB or grayscale. More...
void	cv::cuda::gammaCorrection (InputArray src, OutputArray dst, bool forward=true, Stream &stream=Stream::Null())
	Routines for correcting image color gamma. More...
void	cv::cuda::swapChannels (InputOutputArray image, const int dstOrder[4], Stream &stream=Stream::Null())
	Exchanges the color channels of an image in-place. More...

Detailed Description

Enumeration Type Documentation

AlphaCompTypes

enum cv::cuda::AlphaCompTypes

Enumerator
ALPHA_OVER
ALPHA_IN
ALPHA_OUT
ALPHA_ATOP
ALPHA_XOR
ALPHA_PLUS
ALPHA_OVER_PREMUL
ALPHA_IN_PREMUL
ALPHA_OUT_PREMUL
ALPHA_ATOP_PREMUL
ALPHA_XOR_PREMUL
ALPHA_PLUS_PREMUL
ALPHA_PREMUL

DemosaicTypes

enum cv::cuda::DemosaicTypes

Enumerator
COLOR_BayerBG2BGR_MHT	Bayer Demosaicing (Malvar, He, and Cutler)
COLOR_BayerGB2BGR_MHT
COLOR_BayerRG2BGR_MHT
COLOR_BayerGR2BGR_MHT
COLOR_BayerBG2RGB_MHT
COLOR_BayerGB2RGB_MHT
COLOR_BayerRG2RGB_MHT
COLOR_BayerGR2RGB_MHT
COLOR_BayerBG2GRAY_MHT
COLOR_BayerGB2GRAY_MHT
COLOR_BayerRG2GRAY_MHT
COLOR_BayerGR2GRAY_MHT

Function Documentation

alphaComp()

void cv::cuda::alphaComp	(	InputArray	img1,
		InputArray	img2,
		OutputArray	dst,
		int	alpha_op,
		Stream &	stream = Stream::Null()
	)

Composites two images using alpha opacity values contained in each image.

Parameters

img1	First image. Supports CV_8UC4 , CV_16UC4 , CV_32SC4 and CV_32FC4 types.
img2	Second image. Must have the same size and the same type as img1 .
dst	Destination image.
alpha_op	Flag specifying the alpha-blending operation: ALPHA_OVER ALPHA_IN ALPHA_OUT ALPHA_ATOP ALPHA_XOR ALPHA_PLUS ALPHA_OVER_PREMUL ALPHA_IN_PREMUL ALPHA_OUT_PREMUL ALPHA_ATOP_PREMUL ALPHA_XOR_PREMUL ALPHA_PLUS_PREMUL ALPHA_PREMUL
stream	Stream for the asynchronous version.

Note

• An example demonstrating the use of alphaComp can be found at opencv_source_code/samples/gpu/alpha_comp.cpp

cvtColor()

void cv::cuda::cvtColor	(	InputArray	src,
		OutputArray	dst,
		int	code,
		int	dcn = 0,
		Stream &	stream = Stream::Null()
	)

Converts an image from one color space to another.

Parameters

src	Source image with CV_8U , CV_16U , or CV_32F depth and 1, 3, or 4 channels.
dst	Destination image.
code	Color space conversion code. For details, see cvtColor .
dcn	Number of channels in the destination image. If the parameter is 0, the number of the channels is derived automatically from src and the code .
stream	Stream for the asynchronous version.

3-channel color spaces (like HSV, XYZ, and so on) can be stored in a 4-channel image for better performance.

See also

cvtColor

demosaicing()

void cv::cuda::demosaicing	(	InputArray	src,
		OutputArray	dst,
		int	code,
		int	dcn = -1,
		Stream &	stream = Stream::Null()
	)

Converts an image from Bayer pattern to RGB or grayscale.

Parameters

src	Source image (8-bit or 16-bit single channel).
dst	Destination image.
code	Color space conversion code (see the description below).
dcn	Number of channels in the destination image. If the parameter is 0, the number of the channels is derived automatically from src and the code .
stream	Stream for the asynchronous version.

The function can do the following transformations:

• Demosaicing using bilinear interpolation

  > - COLOR_BayerBG2GRAY , COLOR_BayerGB2GRAY , COLOR_BayerRG2GRAY , COLOR_BayerGR2GRAY > - COLOR_BayerBG2BGR , COLOR_BayerGB2BGR , COLOR_BayerRG2BGR , COLOR_BayerGR2BGR

• Demosaicing using Malvar-He-Cutler algorithm ([61])

  > - COLOR_BayerBG2GRAY_MHT , COLOR_BayerGB2GRAY_MHT , COLOR_BayerRG2GRAY_MHT , > COLOR_BayerGR2GRAY_MHT > - COLOR_BayerBG2BGR_MHT , COLOR_BayerGB2BGR_MHT , COLOR_BayerRG2BGR_MHT , > COLOR_BayerGR2BGR_MHT

See also

cvtColor

gammaCorrection()

void cv::cuda::gammaCorrection	(	InputArray	src,
		OutputArray	dst,
		bool	forward = true,
		Stream &	stream = Stream::Null()
	)

Routines for correcting image color gamma.

Parameters

src	Source image (3- or 4-channel 8 bit).
dst	Destination image.
forward	true for forward gamma correction or false for inverse gamma correction.
stream	Stream for the asynchronous version.

swapChannels()

void cv::cuda::swapChannels	(	InputOutputArray	image,
		const int	dstOrder[4],
		Stream &	stream = Stream::Null()
	)

Exchanges the color channels of an image in-place.

Parameters

image	Source image. Supports only CV_8UC4 type.
dstOrder	Integer array describing how channel values are permutated. The n-th entry of the array contains the number of the channel that is stored in the n-th channel of the output image. E.g. Given an RGBA image, aDstOrder = [3,2,1,0] converts this to ABGR channel order.
stream	Stream for the asynchronous version.

The methods support arbitrary permutations of the original channels, including replication.