| c++ Programming Glossary: make_it_grayOpenCV: process every frame http://stackoverflow.com/questions/3907028/opencv-process-every-frame  on each frame retrieved by the system. On my example make_it_gray allocates a new image to save the result of the grayscale conversion.. highgui.h typedef IplImage callback_prototype IplImage make_it_gray our custom callback to convert a colored frame to its grayscale.. IplImage yourself after calling this function. IplImage make_it_gray IplImage frame Allocate space for a new image IplImage gray_frame.. 
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