1 uses SIFT image matching key points 2 in the video, detecting critical points in one frame, after which it canonical patch transfer key, the frame after a certain threshold value, calculating the key points again, the use of the difference between adjacent frames is small critical point, only the update key position, to improve the frame rate. 3 threshold is determined automatically

main.cpp
operation.cpp
operation.h
patch.h
box.png
box_in_scene.png

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