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samples: demonstrate SimpleBlobDetector contour collection

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Enable collectContours in detect_blob.cpp and draw the per-blob
contours returned by getBlobContours(), so the sample exercises the
public contour-collection API added in #21942.

Refs #25904
This commit is contained in:
Arnesh Banerjee
2026-06-07 12:18:39 +05:30
parent ab1aaa75aa
commit 11b0bd15cf
1 changed files with 7 additions and 0 deletions
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samples/cpp/detect_blob.cpp
+7
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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);