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opencv/modules/imgcodecs/test/test_png.cpp
zihaomu 934e6899f8
Merge pull request #25809 from zihaomu:imread_rgb_flag 
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
2024-07-03 10:58:25 +03:00

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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html
#include "test_precomp.hpp"
namespace opencv_test { namespace {
#if defined(HAVE_PNG) || defined(HAVE_SPNG)
TEST(Imgcodecs_Png, write_big)
{
const string root = cvtest::TS::ptr()->get_data_path();
const string filename = root + "readwrite/read.png";
const string dst_file = cv::tempfile(".png");
Mat img;
ASSERT_NO_THROW(img = imread(filename));
ASSERT_FALSE(img.empty());
EXPECT_EQ(13043, img.cols);
EXPECT_EQ(13917, img.rows);
ASSERT_NO_THROW(imwrite(dst_file, img));
EXPECT_EQ(0, remove(dst_file.c_str()));
}
TEST(Imgcodecs_Png, encode)
{
vector<uchar> buff;
Mat img_gt = Mat::zeros(1000, 1000, CV_8U);
vector<int> param;
param.push_back(IMWRITE_PNG_COMPRESSION);
param.push_back(3); //default(3) 0-9.
EXPECT_NO_THROW(imencode(".png", img_gt, buff, param));
Mat img;
EXPECT_NO_THROW(img = imdecode(buff, IMREAD_ANYDEPTH)); // hang
EXPECT_FALSE(img.empty());
EXPECT_PRED_FORMAT2(cvtest::MatComparator(0, 0), img, img_gt);
}
TEST(Imgcodecs_Png, regression_ImreadVSCvtColor)
{
const string root = cvtest::TS::ptr()->get_data_path();
const string imgName = root + "../cv/shared/lena.png";
Mat original_image = imread(imgName);
Mat gray_by_codec = imread(imgName, IMREAD_GRAYSCALE);
Mat gray_by_cvt;
cvtColor(original_image, gray_by_cvt, COLOR_BGR2GRAY);
Mat diff;
absdiff(gray_by_codec, gray_by_cvt, diff);
EXPECT_LT(cvtest::mean(diff)[0], 1.);
EXPECT_PRED_FORMAT2(cvtest::MatComparator(10, 0), gray_by_codec, gray_by_cvt);
}
// Test OpenCV issue 3075 is solved
TEST(Imgcodecs_Png, read_color_palette_with_alpha)
{
const string root = cvtest::TS::ptr()->get_data_path();
Mat img;
// First Test : Read PNG with alpha, imread flag -1
img = imread(root + "readwrite/color_palette_alpha.png", IMREAD_UNCHANGED);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 4);
// pixel is red in BGRA
EXPECT_EQ(img.at<Vec4b>(0, 0), Vec4b(0, 0, 255, 255));
EXPECT_EQ(img.at<Vec4b>(0, 1), Vec4b(0, 0, 255, 255));
// Second Test : Read PNG without alpha, imread flag -1
img = imread(root + "readwrite/color_palette_no_alpha.png", IMREAD_UNCHANGED);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 3);
// pixel is red in BGR
EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
// Third Test : Read PNG with alpha, imread flag 1
img = imread(root + "readwrite/color_palette_alpha.png", IMREAD_COLOR);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 3);
// pixel is red in BGR
EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
img = imread(root + "readwrite/color_palette_alpha.png", IMREAD_COLOR_RGB);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 3);
// pixel is red in RGB
EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(255, 0, 0));
EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(255, 0, 0));
// Fourth Test : Read PNG without alpha, imread flag 1
img = imread(root + "readwrite/color_palette_no_alpha.png", IMREAD_COLOR);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 3);
// pixel is red in BGR
EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
img = imread(root + "readwrite/color_palette_no_alpha.png", IMREAD_COLOR_RGB);
ASSERT_FALSE(img.empty());
ASSERT_TRUE(img.channels() == 3);
// pixel is red in RGB
EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(255, 0, 0));
EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(255, 0, 0));
}
/**
* Test for check whether reading exif orientation tag was processed successfully or not
* The test info is the set of 8 images named testExifRotate_{1 to 8}.png
* The test image is the square 10x10 points divided by four sub-squares:
* (R corresponds to Red, G to Green, B to Blue, W to white)
* --------- ---------
* | R | G | | G | R |
* |-------| - (tag 1) |-------| - (tag 2)
* | B | W | | W | B |
* --------- ---------
*
* --------- ---------
* | W | B | | B | W |
* |-------| - (tag 3) |-------| - (tag 4)
* | G | R | | R | G |
* --------- ---------
*
* --------- ---------
* | R | B | | G | W |
* |-------| - (tag 5) |-------| - (tag 6)
* | G | W | | R | B |
* --------- ---------
*
* --------- ---------
* | W | G | | B | R |
* |-------| - (tag 7) |-------| - (tag 8)
* | B | R | | W | G |
* --------- ---------
*
*
* Every image contains exif field with orientation tag (0x112)
* After reading each image and applying the orientation tag,
* the resulting image should be:
* ---------
* | R | G |
* |-------|
* | B | W |
* ---------
*
*/
typedef testing::TestWithParam<string> Imgcodecs_PNG_Exif;
// Solution to issue 16579: PNG read doesn't support Exif orientation data
#ifdef OPENCV_IMGCODECS_PNG_WITH_EXIF
TEST_P(Imgcodecs_PNG_Exif, exif_orientation)
#else
TEST_P(Imgcodecs_PNG_Exif, DISABLED_exif_orientation)
#endif
{
const string root = cvtest::TS::ptr()->get_data_path();
const string filename = root + GetParam();
const int colorThresholdHigh = 250;
const int colorThresholdLow = 5;
Mat m_img = imread(filename);
ASSERT_FALSE(m_img.empty());
Vec3b vec;
//Checking the first quadrant (with supposed red)
vec = m_img.at<Vec3b>(2, 2); //some point inside the square
EXPECT_LE(vec.val[0], colorThresholdLow);
EXPECT_LE(vec.val[1], colorThresholdLow);
EXPECT_GE(vec.val[2], colorThresholdHigh);
//Checking the second quadrant (with supposed green)
vec = m_img.at<Vec3b>(2, 7); //some point inside the square
EXPECT_LE(vec.val[0], colorThresholdLow);
EXPECT_GE(vec.val[1], colorThresholdHigh);
EXPECT_LE(vec.val[2], colorThresholdLow);
//Checking the third quadrant (with supposed blue)
vec = m_img.at<Vec3b>(7, 2); //some point inside the square
EXPECT_GE(vec.val[0], colorThresholdHigh);
EXPECT_LE(vec.val[1], colorThresholdLow);
EXPECT_LE(vec.val[2], colorThresholdLow);
}
const string exif_files[] =
{
"readwrite/testExifOrientation_1.png",
"readwrite/testExifOrientation_2.png",
"readwrite/testExifOrientation_3.png",
"readwrite/testExifOrientation_4.png",
"readwrite/testExifOrientation_5.png",
"readwrite/testExifOrientation_6.png",
"readwrite/testExifOrientation_7.png",
"readwrite/testExifOrientation_8.png"
};
INSTANTIATE_TEST_CASE_P(ExifFiles, Imgcodecs_PNG_Exif,
testing::ValuesIn(exif_files));
typedef testing::TestWithParam<string> Imgcodecs_Png_PngSuite;
TEST_P(Imgcodecs_Png_PngSuite, decode)
{
const string root = cvtest::TS::ptr()->get_data_path();
const string filename = root + "pngsuite/" + GetParam() + ".png";
const string xml_filename = root + "pngsuite/" + GetParam() + ".xml";
FileStorage fs(xml_filename, FileStorage::READ);
EXPECT_TRUE(fs.isOpened());
Mat src = imread(filename, IMREAD_UNCHANGED);
Mat gt;
fs.getFirstTopLevelNode() >> gt;
EXPECT_PRED_FORMAT2(cvtest::MatComparator(0, 0), src, gt);
}
const string pngsuite_files[] =
{
"basi0g01",
"basi0g02",
"basi0g04",
"basi0g08",
"basi0g16",
"basi2c08",
"basi2c16",
"basi3p01",
"basi3p02",
"basi3p04",
"basi3p08",
"basi4a08",
"basi4a16",
"basi6a08",
"basi6a16",
"basn0g01",
"basn0g02",
"basn0g04",
"basn0g08",
"basn0g16",
"basn2c08",
"basn2c16",
"basn3p01",
"basn3p02",
"basn3p04",
"basn3p08",
"basn4a08",
"basn4a16",
"basn6a08",
"basn6a16",
"bgai4a08",
"bgai4a16",
"bgan6a08",
"bgan6a16",
"bgbn4a08",
"bggn4a16",
"bgwn6a08",
"bgyn6a16",
"ccwn2c08",
"ccwn3p08",
"cdfn2c08",
"cdhn2c08",
"cdsn2c08",
"cdun2c08",
"ch1n3p04",
"ch2n3p08",
"cm0n0g04",
"cm7n0g04",
"cm9n0g04",
"cs3n2c16",
"cs3n3p08",
"cs5n2c08",
"cs5n3p08",
"cs8n2c08",
"cs8n3p08",
"ct0n0g04",
"ct1n0g04",
"cten0g04",
"ctfn0g04",
"ctgn0g04",
"cthn0g04",
"ctjn0g04",
"ctzn0g04",
"exif2c08",
"f00n0g08",
"f00n2c08",
"f01n0g08",
"f01n2c08",
"f02n0g08",
"f02n2c08",
"f03n0g08",
"f03n2c08",
"f04n0g08",
"f04n2c08",
"f99n0g04",
"g03n0g16",
"g03n2c08",
"g03n3p04",
"g04n0g16",
"g04n2c08",
"g04n3p04",
"g05n0g16",
"g05n2c08",
"g05n3p04",
"g07n0g16",
"g07n2c08",
"g07n3p04",
"g10n0g16",
"g10n2c08",
"g10n3p04",
"g25n0g16",
"g25n2c08",
"g25n3p04",
"oi1n0g16",
"oi1n2c16",
"oi2n0g16",
"oi2n2c16",
"oi4n0g16",
"oi4n2c16",
"oi9n0g16",
"oi9n2c16",
"pp0n2c16",
"pp0n6a08",
"ps1n0g08",
"ps1n2c16",
"ps2n0g08",
"ps2n2c16",
"s01i3p01",
"s01n3p01",
"s02i3p01",
"s02n3p01",
"s03i3p01",
"s03n3p01",
"s04i3p01",
"s04n3p01",
"s05i3p02",
"s05n3p02",
"s06i3p02",
"s06n3p02",
"s07i3p02",
"s07n3p02",
"s08i3p02",
"s08n3p02",
"s09i3p02",
"s09n3p02",
"s32i3p04",
"s32n3p04",
"s33i3p04",
"s33n3p04",
"s34i3p04",
"s34n3p04",
"s35i3p04",
"s35n3p04",
"s36i3p04",
"s36n3p04",
"s37i3p04",
"s37n3p04",
"s38i3p04",
"s38n3p04",
"s39i3p04",
"s39n3p04",
"s40i3p04",
"s40n3p04",
"tbbn0g04",
"tbbn2c16",
"tbbn3p08",
"tbgn2c16",
"tbgn3p08",
"tbrn2c08",
"tbwn0g16",
"tbwn3p08",
"tbyn3p08",
"tm3n3p02",
"tp0n0g08",
"tp0n2c08",
"tp0n3p08",
"tp1n3p08",
"z00n2c08",
"z03n2c08",
"z06n2c08",
"z09n2c08",
};
INSTANTIATE_TEST_CASE_P(/*nothing*/, Imgcodecs_Png_PngSuite,
testing::ValuesIn(pngsuite_files));
typedef testing::TestWithParam<string> Imgcodecs_Png_PngSuite_Corrupted;
TEST_P(Imgcodecs_Png_PngSuite_Corrupted, decode)
{
const string root = cvtest::TS::ptr()->get_data_path();
const string filename = root + "pngsuite/" + GetParam() + ".png";
Mat src = imread(filename, IMREAD_UNCHANGED);
// Corrupted files should not be read
EXPECT_TRUE(src.empty());
}
const string pngsuite_files_corrupted[] = {
"xc1n0g08",
"xc9n2c08",
"xcrn0g04",
"xcsn0g01",
"xd0n2c08",
"xd3n2c08",
"xd9n2c08",
"xdtn0g01",
"xhdn0g08",
"xlfn0g04",
"xs1n0g01",
"xs2n0g01",
"xs4n0g01",
"xs7n0g01",
};
INSTANTIATE_TEST_CASE_P(/*nothing*/, Imgcodecs_Png_PngSuite_Corrupted,
testing::ValuesIn(pngsuite_files_corrupted));
#endif // HAVE_PNG
}} // namespace
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