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Merge pull request #29255 from ArneshBanerjee:samples-blob-contours-29254

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samples: demonstrate SimpleBlobDetector contour collection
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Alexander Smorkalov
2026-06-11 18:30:34 +03:00
committed by GitHub
parent 590d8f6439 11b0bd15cf
commit a77474f3b1
1 changed files with 7 additions and 0 deletions
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samples/cpp/detect_blob.cpp
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@@ -107,6 +107,8 @@ int main(int argc, char *argv[])
pDefaultBLOB.filterByConvexity = false;
pDefaultBLOB.minConvexity = 0.95f;
pDefaultBLOB.maxConvexity = (float)1e37;
// Enable contour collection so we can draw blob outlines (see getBlobContours() below).
pDefaultBLOB.collectContours = true;
// Descriptor array for BLOB
vector<String> typeDesc;
// Param array for BLOB
@@ -189,6 +191,11 @@ int main(int argc, char *argv[])
int i = 0;
for (vector<KeyPoint>::iterator k = keyImg.begin(); k != keyImg.end(); ++k, ++i)
circle(result, k->pt, (int)k->size, palette[i % 65536]);
// Retrieve the per-blob contours collected during detect() and outline each blob.
// Requires SimpleBlobDetector::Params::collectContours to be true.
const vector<vector<Point> >& blobContours = sbd->getBlobContours();
for (size_t c = 0; c < blobContours.size(); ++c)
drawContours(result, blobContours, (int)c, Scalar(0, 255, 0), 1);
}
namedWindow(*itDesc + label, WINDOW_AUTOSIZE);
imshow(*itDesc + label, result);