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Dec 10, 2012, 04:58 AM
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Board cams vs. web cams

The thought of going back to board cams has occurred. Boardcams do visible light only. Webcams do infrared. That's the only reason for using webcams.

Boardcams can do useful resolutions from 40fps to 70fps. Webcams can only do 30fps. Boardcams can probably do higher resolution on the raspberry pi than webcams, since they do RLE compression & luma keying on the board. Decompressing webcam JPEG video & luma keying takes over 30% of the pi.

Boardcams can probably do lower latency, since they transfer much less data than webcams. They might have higher latency, since they have to wait for beacons to transmit.

Boardcams are a pain to program, since all the firmware is done in house. They can be daisychained & multiplexed with a 900Mhz radio, eliminating a USB hub completely.

The next step is 2 cameras on independent pan/tilt mounts, spaced more than 1ft apart. That would give the depth perception of a multicam vicon system, but use the pan/tilt mounts to emulate more than 2 cameras.

Spacing multiplexed cameras would require LVD buffer chips & reduce the frame rate. Multiplexing was manely required for synchronizing the cameras. Dual USB cables continue to be the optimum way.

If Marcy 1 proves successful with visible light, she would definitely go back to a board cam, eliminating a USB hub & making the last 2 days of PIC debugging irrelevant.
Last edited by Jack Crossfire; Dec 10, 2012 at 05:07 AM.
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