Sample a pixel.
Sample a pixel.


Former-commit-id: bb2671b0883ce3e4ca0af29f20e9b27046d8b8d5 [formerly 0448575df16f8455021c054b141c7486fdf7e8ca]
Former-commit-id: 519be52949d3337c999fc7329498ff7295f47649
tourdrone/cvdrone,tourdrone/cvdrone