Color space processing

Overview

// enums

enum cv::cuda::AlphaCompTypes;
enum cv::cuda::DemosaicTypes;

// global functions

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

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

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

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

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

Detailed Documentation

Global 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.

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

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.

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.

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

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.

See also:

cvtColor

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.

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 ([32])

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

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.

See also:

cvtColor

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.

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

Exchanges the color channels of an image in-place.

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

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.