RaspiCV

RaspiVid modified to provide image and motion vector data for processing in OpenCV.

The original RaspiVid.c is modified (see f564a2f) to pass image and motion vector buffers to callbacks defined in cv.h. File cv.cpp implements these callbacks and handles simple processing (display image and motion vectors).

The motion vectors displayed by the application are colored according to their SAD (sum of absolute differences) value. SAD value of 0 corresponds to blue, SAD Threshold corresponds to red. Vectors with SAD above the threshold are not displayed:

Building

First build the OpenCV library and make sure it is registered by pkg-config:

pkg-config --libs opencv

Then make the USERLAND_DIR variable in Makefile point to Raspberry Pi's userland repository. Makefile references some files required by RaspiVidCv.c.

Finally, build the application by make and run it by make run or:

raspicv -v -w 640 -h 480 -fps 30 -t 0 -o /dev/null -x /dev/null -r /dev/null -rf gray

Currently the cv.cpp is limited to 640x480 grayscale image. This can be easily modified (see function cv_init()).