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Identify and draw contours around objects in any image. Useful for shape analysis, object counting, and boundary visualization.
Find and draw contours around objects — outline shapes and regions in images.
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Contour detection finds continuous curves that form the boundaries of objects in an image. It is used in shape analysis, object counting, gesture recognition, and industrial inspection.
External mode detects only outermost contours (no nested boundaries). All mode returns every contour including holes. Tree mode preserves the parent-child hierarchy.