sudo apt-get install fswebcam

sudo apt-get install fswebcam

sudo apt-get install fswebcam

sudo apt-get install fswebcam

sudo apt-get install fswebcam

fswebcam image.jpg

fswebcam -r 1280x720 image2.jpg

cvQueryFrame(cap);
 cvSameImage(filename, frame, params);

v4l2-ctl --set-fmt-video=width=2592,height=1944,pixelformat=3
v4l2-ctl --stream-mmap=3 --stream-count=1 --stream-to=somefile.jpg