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imgcodecs: Add rgb flag for imread and imdecode #25809 Try to `imread` images by RGB to save R-B swapping costs. ## How to use it? ``` img_rgb = cv2.imread("PATH", IMREAD_COLOR_RGB) # OpenCV decode the image by RGB format. ``` ## TODO - [x] Fix the broken code - [x] Add imread rgb test - [x] Speed test of rgb mode. ## Performance test | file name | IMREAD_COLOR | IMREAD_COLOR_RGB | | --------- | ------ | --------- | | jpg01 | 284 ms | 277 ms | | jpg02 | 376 ms | 366 ms | | png01 | 62 ms | 60 ms | | Png02 | 97 ms | 94 ms | Test with [image_test.zip](https://github.com/user-attachments/files/15982949/image_test.zip) ```.cpp string img_path = "/Users/mzh/work/data/image_test/png02.png"; int loop = 20; TickMeter t; double t0 = 10000; for (int i = 0; i < loop; i++) { t.reset(); t.start(); img_bgr = imread(img_path, IMREAD_COLOR); t.stop(); if (t.getTimeMilli() < t0) t0 = t.getTimeMilli(); } std::cout<<"bgr time = "<<t0<<std::endl; t0 = 10000; for (int i = 0; i < loop; i++) { t.reset(); t.start(); img_rgb = imread(img_path, IMREAD_COLOR_RGB); t.stop(); if (t.getTimeMilli() < t0) t0 = t.getTimeMilli(); } std::cout<<"rgb time = "<<t0<<std::endl; ``` ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html
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#ifndef __OPENCV_TEST_PRECOMP_HPP__
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#define __OPENCV_TEST_PRECOMP_HPP__
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#include "opencv2/ts.hpp"
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#include "opencv2/imgcodecs.hpp"
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#include "opencv2/imgproc/imgproc_c.h"
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namespace cv {
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static inline
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void PrintTo(const ImreadModes& val, std::ostream* os)
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{
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int v = val;
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if (v == IMREAD_UNCHANGED && (v & IMREAD_IGNORE_ORIENTATION) != 0)
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{
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CV_Assert(IMREAD_UNCHANGED == -1);
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*os << "IMREAD_UNCHANGED";
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return;
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}
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if ((v & IMREAD_COLOR) != 0)
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{
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CV_Assert(IMREAD_COLOR == 1);
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v &= ~IMREAD_COLOR;
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*os << "IMREAD_COLOR" << (v == 0 ? "" : " | ");
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}
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else
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{
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CV_Assert(IMREAD_GRAYSCALE == 0);
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*os << "IMREAD_GRAYSCALE" << (v == 0 ? "" : " | ");
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}
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if ((v & IMREAD_ANYDEPTH) != 0)
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{
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v &= ~IMREAD_ANYDEPTH;
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*os << "IMREAD_ANYDEPTH" << (v == 0 ? "" : " | ");
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}
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if ((v & IMREAD_ANYCOLOR) != 0)
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{
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v &= ~IMREAD_ANYCOLOR;
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*os << "IMREAD_ANYCOLOR" << (v == 0 ? "" : " | ");
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}
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if ((v & IMREAD_LOAD_GDAL) != 0)
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{
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v &= ~IMREAD_LOAD_GDAL;
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*os << "IMREAD_LOAD_GDAL" << (v == 0 ? "" : " | ");
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}
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if ((v & IMREAD_IGNORE_ORIENTATION) != 0)
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{
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v &= ~IMREAD_IGNORE_ORIENTATION;
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*os << "IMREAD_IGNORE_ORIENTATION" << (v == 0 ? "" : " | ");
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}
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if ((v & IMREAD_COLOR_RGB) != 0)
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{
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v &= ~IMREAD_COLOR_RGB;
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*os << "IMREAD_COLOR_RGB" << (v == 0 ? "" : " | ");
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}
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switch (v)
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{
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case IMREAD_UNCHANGED: return;
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case IMREAD_GRAYSCALE: return;
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case IMREAD_COLOR: return;
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case IMREAD_ANYDEPTH: return;
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case IMREAD_ANYCOLOR: return;
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case IMREAD_LOAD_GDAL: return;
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case IMREAD_REDUCED_GRAYSCALE_2: // fallthru
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case IMREAD_REDUCED_COLOR_2: *os << "REDUCED_2"; return;
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case IMREAD_REDUCED_GRAYSCALE_4: // fallthru
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case IMREAD_REDUCED_COLOR_4: *os << "REDUCED_4"; return;
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case IMREAD_REDUCED_GRAYSCALE_8: // fallthru
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case IMREAD_REDUCED_COLOR_8: *os << "REDUCED_8"; return;
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case IMREAD_IGNORE_ORIENTATION: return;
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case IMREAD_COLOR_RGB: return;
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} // don't use "default:" to emit compiler warnings
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*os << "IMREAD_UNKNOWN(" << (int)v << ")";
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}
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} // namespace
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#endif
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