[MPlayer-users] Looking for a software to clip a movie camera to size
gheskett at wdtv.com
Sun Sep 22 20:47:59 CEST 2013
The movie camera is one on Logitechs top models, with a resolution
somewhere above 2kx2k, auto focus etc.
Its being used with a utility that can be integrated into the LinuxCNC axis
GUI, with facilities being utilized for machine vision.
However, by the time it actually gets to the window in the gui, all the
processing that huge image undergoes takes so much time that the windows
refresh rate is about 1 frame a second, and the actual video image we see
is 4 or 5 frames old, so you stop the machine and wait quite a few seconds
for the output video to get through the system and display.
This obviously isn't conducive to learning how to use it productively
since, in the case of milling a printed circuit board, I can drill a hole
through the board in a known location, turn the board over, drive the
machine to put that drill into the hole and execute a command that tells
the machine I don't care where you think you are, you are in fact here,
giving it the known coordinates of the hole.
It occurs to me that since most of this utilities image processing is
modeled on a 640x480 image format, the decimation of all that data into a
640x480 format has to be a huge time killer, whereas if we handed it a
640x480 format signal in the first place, 80% of all that data shuffling
could just go away, giving a speedup that would make it usable.
Since the nature of this sort of job would have more accuracy if the camera
had a zoom lens, which it does not, the fix would seem to me to be in
determining the center of the image, calculating 240 lines up and 240
lines down and using that as a gate, then calculating 320 pixels to the
left & right & using that for a gate too, so that the output then would be
the 640x480 we need, throwing away the rest of the data in real time.
The rest of the processing chain could then spend its time generating the
crosshairs and bullseye target circles supered on that, and do it at 5 to
20 frames a second. That would be approaching real time enough to make it
Is there such a video processing module in our 'bag of tricks'?
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