Need an fft hystogram of a cameras output

[Gene Heskett <gheskett@shentel.net>]

Greetings all;

Do we have such a critter that can analyze the output of a v4l2 camera, 
and give an amplitude at bandwidth histogram?

I need a way to establish the absolute best focal distance of a camera 
acting as machine vision, and which acts like about 4 to 5 cm is about 
right. What I want to do is drive forward until a probe contacts the 
target, and zero the rest of the visual measurements to that distance 
for best accuracy.  But I'll use this to determine the length of the 
probe by looking for the highest amplitude at the highest frequencies 
from zero, which would indicate best focus.

Thanks all, for any names of video utils to check out.

Cheers, Gene Heskett
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