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features: fix MSER discarding stable regions via minDiversity (#29652)

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This commit is contained in:
Lazizbek Ergashev
2026-08-03 13:13:36 +05:00
parent d6eb13adb9
commit 02466fac6b
2 changed files with 11 additions and 19 deletions
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2
modules/features/src/mser.cpp
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@@ -264,7 +264,7 @@ public:
if( checked )
return;
checked = true;
if( size < wp.p.minArea || size > wp.p.maxArea || var < wp.p.minDiversity || var > wp.p.maxVariation )
if( size < wp.p.minArea || size > wp.p.maxArea || var < 0.f || var > wp.p.maxVariation )
return;
if( child_ )
{

28
modules/features/test/test_mser.cpp
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@@ -182,27 +182,19 @@ TEST(Features2d_MSER, history_update_regression)
}
TEST(Features2d_MSER, bug_5630)
TEST(Features2d_MSER, default_params_regression_29652)
{
String dataPath = cvtest::TS::ptr()->get_data_path() + "mser/";
Mat img = imread(dataPath + "mser_test.png", IMREAD_GRAYSCALE);
Ptr<MSER> mser = MSER::create(1, 1);
vector<vector<Point> > mserContours;
vector<Rect> boxRects;
Mat img = Mat::zeros(200, 200, CV_8U);
rectangle(img, Point(40, 40), Point(160, 160), Scalar(255), -1);
circle(img, Point(100, 100), 30, Scalar(0), -1);
// set min diversity and run detection
mser->setMinDiversity(0.1);
mser->detectRegions(img, mserContours, boxRects);
size_t originalNumberOfContours = mserContours.size();
// increase min diversity and run detection again
mser->setMinDiversity(0.2);
mser->detectRegions(img, mserContours, boxRects);
size_t newNumberOfContours = mserContours.size();
// there should be fewer regions detected with a higher min diversity
ASSERT_LT(newNumberOfContours, originalNumberOfContours);
Ptr<MSER> mser = MSER::create();
vector<vector<Point> > regions;
vector<Rect> bboxes;
mser->detectRegions(img, regions, bboxes);
ASSERT_FALSE(regions.empty());
ASSERT_EQ(regions.size(), bboxes.size());
}
}} // namespace