cam_overlay is a simple program that reads a webcam and displays it on the screen along with an overlay image.
It's primary purpose is to offload as much of the image processing/decoding to the Raspberry Pi's GPU as possible and disply a reverse camera overlay.
cd /opt/vc/src/hello_pi/libs/ilclient
makeTODO: Instructions to install dependencies
Simply run make from the command line in the cam_overlay directory
Run make DISPLAY=x11 from the command line
From the command line, simply run with the appropriate parameters
./cam_overlay.bin
If running from the command line, Ctrl+C will stop.
If stopping from another console, using killall cam_overlay.bin will stop.
If running from another application, sending a KILLTERM signal will stop.
Command line parameters allow you to tweak the behavior.
| Command | Long Command | Details |
|---|---|---|
| -d | --device | v4l2 device name. Default: /dev/video0 |
| -m | --mmap | Use memory mapped buffers [default] |
| -r | --read | Use read() calls |
| -u | --userp | Use application allocated buffers |
| -s | --stretch | Stretch image to screen |
| -R | --rotate | Rotate image 180 degrees |
| -h | --fliph | Flip image horizontally |
| -v | --flipv | Flip image vertically |