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What does cv_haar_scale_image do in opencv's function cvhaardetectobjects?
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It enables more optimization.
The face detect implementation is optimized for CV_HAAR_SCALE_IMAGE more than CV_HAAR_DO_CANNY_PRUNING.
Because CV_HAAR_SCALE_IMAGE method is more DMA (direct memory access) friendly. Default method (CV_HAAR_DO_CANNY_PRUNING) implementation needs random access to main memory area widely.
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