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Varun Jaiswal 1bc76bc0fe Merge pull request #29740 from varun-jaiswal17:imgproc_cleanup
Imgproc test cleanup - #29740

co-authored by: @Prasadayus

  ### Re-enabled as-is (stale disable reasons)
  - `FillPolyFully.fillpoly_fully` (`test_drawing.cpp:1142`)
  - `Resize_Bitexact` (`test_resize_bitexact.cpp:188`, 4 instantiations): `INTER_NEAREST` and
  `INTER_NEAREST_EXACT` agree exactly at integer upscale factors; measured 0.0 diff on all 4.

### Add assertions

- **imgproc** — new `Imgproc_Watershed.regression`: `cv::watershed` had no working coverage at all.

### 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
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake
2026-08-26 10:50:42 +03:00

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3.3 KiB
C++

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#include "test_precomp.hpp"
namespace opencv_test { namespace {
TEST(Imgproc_UMat, regression)
{
const string imgpath = cvtest::findDataFile("shared/lena.png");
Mat img = imread(imgpath, IMREAD_COLOR);
ASSERT_FALSE(img.empty());
Mat gray, smallimg, result;
cvtColor(img, gray, COLOR_BGR2GRAY);
resize(gray, smallimg, Size(), 0.75, 0.75, INTER_LINEAR_EXACT);
equalizeHist(smallimg, result);
// Deliberately getUMat() rather than copyTo(): the ocl/ tests always upload
// by copy (UMAT_UPLOAD_INPUT_PARAMETER), so this is the only coverage of an
// imgproc chain fed by a UMat view over a Mat that stays alive alongside it.
UMat uimg = img.getUMat(ACCESS_READ), ugray, usmallimg, uresult;
cvtColor(uimg, ugray, COLOR_BGR2GRAY);
resize(ugray, usmallimg, Size(), 0.75, 0.75, INTER_LINEAR_EXACT);
equalizeHist(usmallimg, uresult);
// Measured identical here; the tolerance of 1 matches OCL_TEST_P(EqualizeHist, Mat),
// since bit-exactness was only confirmed on one device.
Mat uresult_host = uresult.getMat(ACCESS_READ);
EXPECT_LE(cv::norm(result, uresult_host, NORM_INF), 1)
<< "Mat and UMat imgproc pipelines disagree";
}
}} // namespace