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GAPI: Addition new Color conversion kernels to CPU backend.#18516

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alalek merged 3 commits intoopencv:masterfrom
anna-khakimova:ak/bgr2rgb
Oct 14, 2020
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GAPI: Addition new Color conversion kernels to CPU backend.#18516
alalek merged 3 commits intoopencv:masterfrom
anna-khakimova:ak/bgr2rgb

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@anna-khakimova anna-khakimova commented Oct 5, 2020 •
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Color conversion kernels were added:

  1. BGR2RGB
  2. BGR2I420
  3. RGB2I420
  4. I4202BGR
  5. I4202RGB

Published for review on 7th of October.

@dmatveev please take a look.

force_builders=Custom,Custom Win,Custom Mac,Linux32,Win32
build_gapi_standalone:Linux x64=ade-0.1.1f
build_gapi_standalone:Win64=ade-0.1.1f
build_gapi_standalone:Mac=ade-0.1.1f
build_gapi_standalone:Linux x64 Debug=ade-0.1.1f

build_image:Custom=centos:7
buildworker:Custom=linux-1
build_gapi_standalone:Custom=ade-0.1.1f

Xbuild_image:Custom=ubuntu-openvino-2020.3.0:16.04
Xbuild_image:Custom Win=openvino-2020.3.0
Xbuild_image:Custom Mac=openvino-2020.3.0

test_modules:Custom=gapi
test_modules:Custom Win=gapi
test_modules:Custom Mac=gapi

buildworker:Custom=linux-1
# disabled due high memory usage: test_opencl:Custom=ON
test_opencl:Custom=OFF
test_bigdata:Custom=1
test_filter:Custom=*

@anna-khakimova anna-khakimova force-pushed the ak/bgr2rgb branch 2 times, most recently from 1c99c39 to e93ac18 Compare October 6, 2020 10:57
@anna-khakimova anna-khakimova force-pushed the ak/bgr2rgb branch 7 times, most recently from 24105f9 to c228da1 Compare October 6, 2020 22:57
@anna-khakimova anna-khakimova changed the title GAPI: Add BGR2RGB kernel to CPU backend. GAPI: Add new kernels to CPU backend. Oct 7, 2020
@dmatveev dmatveev self-requested a review October 7, 2020 10:30
@dmatveev dmatveev self-assigned this Oct 7, 2020
@anna-khakimova anna-khakimova changed the title GAPI: Add new kernels to CPU backend. GAPI: Addition new kernels to CPU backend. Oct 7, 2020
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anna-khakimova commented Oct 8, 2020

@dmatveev please take a look

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dmatveev reviewed Oct 8, 2020
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Looks good but please fix comments

modules/gapi/include/opencv2/gapi/imgproc.hpp Outdated
The function converts an input image from I420 color space to BGR.
The conventional ranges for B, G, and R channel values are 0 to 255.

Output image must be 8-bit unsigned 3-channel image input_height*2/3 @ref CV_8UC3.
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I'd rephrase text here and above on the image height. Currently it doesn't read good.

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Done.

@anna-khakimova anna-khakimova changed the title GAPI: Addition new kernels to CPU backend. GAPI: Addition new Color conversion kernels to CPU backend. Oct 12, 2020
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anna-khakimova commented Oct 12, 2020

@dmatveev please take a look. Comment was applied.

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anna-khakimova commented Oct 13, 2020

@alalek please merge

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modules/gapi/include/opencv2/gapi/imgproc.hpp Outdated
The function converts an input image from BGR color space to RGB.
The conventional ranges for B, G, and R channel values are 0 to 255.

Output image must be 8-bit unsigned 3-channel image @ref CV_8UC3.
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must be

probably this description is not accurate, because output format is defined by "implementation" instead of caller.

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+1, probably simple is is enough

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@anna-khakimova anna-khakimova Oct 14, 2020 •
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@alalek Half of the comments in this file phrased as "Output image must be 8-bit unsigned 3-channel image ". For example for YUV2RGB kernel:

/** @brief Converts an image from YUV color space to RGB.
The function converts an input image from YUV color space to RGB.
The conventional ranges for Y, U, and V channel values are 0 to 255.

Output image must be 8-bit unsigned 3-channel image @ref CV_8UC3.

@note Function textual ID is "org.opencv.imgproc.colorconvert.yuv2rgb"

@param src input image: 8-bit unsigned 3-channel image @ref CV_8UC3.

@sa RGB2Lab, RGB2YUV
*/
GAPI_EXPORTS GMat YUV2RGB(const GMat& src);

However, for some reason, attention was paid only to my comment. The remaining 14 color conversion kernels will remain with comments formulated as "Output image must be 8-bit unsigned ...". I thought we were fighting for uniformity in the comments. But apparently I was wrong.

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Done

modules/gapi/include/opencv2/gapi/imgproc.hpp

Output image must be 8-bit unsigned 1-channel image. @ref CV_8UC1.
Width of I420 output image must be the same as width of input image.
Height of I420 output image must be equal 3/2 from height of input image.
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3/2 from height

Why is not tuple of Y and UV?

/cc @TolyaTalamanov (implemented drawing over NV12 frames)

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@alalek tuple of Y and UV is what we'll do next, but the current request is to provide a cvtColor-based counterpart.

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Please note that there is no C++ overloads for return type only. So it will be hard to improve that without breaking of existed code.
Just keep in mind.

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ok

@anna-khakimova anna-khakimova requested a review from alalek October 14, 2020 14:10
@alalek alalek merged commit 4c048a4 into opencv:master Oct 14, 2020
@alalek alalek mentioned this pull request Nov 27, 2020
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a-sajjad72 pushed a commit to a-sajjad72/opencv that referenced this pull request Mar 30, 2023
Merge pull request opencv#18516 from anna-khakimova:ak/bgr2rgb
0287fa2 
GAPI: Addition new Color conversion kernels to CPU backend.

* Add BGR2RGB kernel to CPU backend

* Add BGR2I420 and RGB2I420 kernels to CPU backend

* Add I4202BGR and I4202RGB kernels to CPU backend
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