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imgproc: document per-code depth support on cvtColor/demosaicing src param

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cvtColor's @param src promised 8U, 16U and 32F unconditionally, but the accepted
depths depend on the conversion code: CV_16U is rejected by COLOR_BGR2HSV,
COLOR_BGR2Lab, COLOR_BGR2Luv and the packed 16-bit codes, while COLOR_BGR2GRAY,
COLOR_BGR2XYZ, COLOR_BGR2YUV and RGB<->RGB accept it. That is what #26447
reported.

State it on @param src and point at the [8U]/[16U]/[32F] markers already
documented on ColorConversionCodes. The @note only said the source "must be of
an appropriate type", which is now redundant, so drop it from both functions.

demosaicing has the same problem: the Variable Number of Gradients codes accept
8-bit input only, while the other Bayer codes also accept 16-bit.

Fixes #26447
This commit is contained in:
Parth Saini
2026-08-12 12:35:49 +05:30
parent 21d60a9afe
commit 3043094d71
1 changed files with 7 additions and 4 deletions
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11
modules/imgproc/include/opencv2/imgproc.hpp
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@@ -3793,14 +3793,15 @@ If conversion adds the alpha channel, its value will set to the maximum of corre
range: 255 for CV_8U, 65535 for CV_16U, 1 for CV_32F.
@param src input image: 8-bit unsigned, 16-bit unsigned ( CV_16UC... ), or single-precision
floating-point.
floating-point. The accepted depths differ between conversions and are listed with each code in
#ColorConversionCodes: for example #COLOR_BGR2GRAY is marked `[8U/16U/32F]`, while
#COLOR_BGR2HSV is marked `[8U/32F]` and rejects `CV_16U`.
@param dst output image of the same size and depth as src.
@param code color space conversion code (see #ColorConversionCodes).
@param 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.
@param hint Implementation modfication flags. See #AlgorithmHint
@note The source image (src) must be of an appropriate type for the desired color conversion. see ColorConversionCodes
@see @ref imgproc_color_conversions
*/
CV_EXPORTS_W void cvtColor( InputArray src, OutputArray dst, int code, int dstCn = 0, AlgorithmHint hint = cv::ALGO_HINT_DEFAULT );
@@ -3828,7 +3829,10 @@ CV_EXPORTS_W void cvtColorTwoPlane( InputArray src1, InputArray src2, OutputArra
/** @brief main function for all demosaicing processes
@param src input image: 8-bit unsigned or 16-bit unsigned.
@param src input image: 8-bit unsigned or 16-bit unsigned. The accepted depths differ between
codes and are listed with each code in #ColorConversionCodes: the Variable Number of Gradients
codes such as #COLOR_BayerBG2BGR_VNG are marked `[8U]` and reject `CV_16U`, while for example
#COLOR_BayerBG2BGR is marked `[8U/16U]`.
@param dst output image of the same size and depth as src.
@param code Color space conversion code (see the description below).
@param dstCn number of channels in the destination image; if the parameter is 0, the number of the
@@ -3854,7 +3858,6 @@ The function can do the following transformations:
#COLOR_BayerBG2BGRA , #COLOR_BayerGB2BGRA , #COLOR_BayerRG2BGRA , #COLOR_BayerGR2BGRA
@note The source image (src) must be of an appropriate type for the desired color conversion. see ColorConversionCodes
@sa cvtColor
*/
CV_EXPORTS_W void demosaicing(InputArray src, OutputArray dst, int code, int dstCn = 0);