perf(polygon-annotator): crop mask to bbox before findContours to reduce scan area#2275
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perf(polygon-annotator): crop mask to bbox before findContours to reduce scan area#2275
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…uce scan area Instead of running mask_to_polygons on the full frame mask, crop to the detection bounding box first and offset the resulting polygon points back to full-frame coordinates. Adds a coordinate-correctness test that would catch a broken offset (existing tests used origin-aligned detections where the +[0,0] offset is a no-op). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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perf(polygon-annotator): crop mask to bbox before findContours to reduce scan area
What does this PR do?
Instead of running mask_to_polygons on the full frame mask, crop to the detection bounding box first and offset the resulting polygon points back to full-frame coordinates. Adds a coordinate-correctness test that would catch a broken offset (existing tests used origin-aligned detections where the +[0,0] offset is a no-op).
Related Issue(s):
Type of Change
Testing
Test details:
I ran this code change on the pella edge devices and the masks drew as before. I also verified there was a significant speedup in the block.
Checklist
Additional Context