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Alternative Imaging Methods
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Old May 19th, 2005, 10:52 PM   #2851
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glad to hear the altasense should work.. so is the filter optical or is it a chip??

btw, obin.. any chance of you having a 'do-it-yourself' guide for building your camera similar to the micro-35 deal..?? my hope is to still be able to use alot of your insights to construct something alittle cheaper on my own..

thanks and keep up the good fight.
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Old May 20th, 2005, 01:22 AM   #2852
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Obin, can you suggest, how can anybody get a single 3562?
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Old May 20th, 2005, 09:35 AM   #2853
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A do-it-your-self guide for a FPGA hardware camera? I don't think so!
that is like asking for a do it your self panasonic varicam system...LOL
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Old May 20th, 2005, 09:36 AM   #2854
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if you want a chip all you need to do is order one from any of the chip makers..not hard at all..the altasense chip with nothing to work with it but a serial port is $1500
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Old May 20th, 2005, 10:03 AM   #2855
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Thread re-opened (and the other Obin thread has been merged into this one).

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Old May 20th, 2005, 10:09 AM   #2856
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every camera has an optical IR cut filter for outdoor sunlight. Altasense is the same, we must buy one and mount it on the cmos
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Old May 20th, 2005, 07:19 PM   #2857
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can anyone here help me understand this chart?

it's for the ALtasense color separation

dv3productions.com/qe_rgb.pdf
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Old May 21st, 2005, 09:49 AM   #2858
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www.dv3productions.com/Altasense3562-8bit.tif

anyone see any reason from this image (other then it's a lin-bayer filter) not to use this chip? I am about to buy one!

does anyone have a good bayer algorithm to apply on it?
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Old May 21st, 2005, 10:20 AM   #2859
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What was the original resolution of that TIF?
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Old May 21st, 2005, 10:49 AM   #2860
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1920 x 1080 with bayer filter is the orginal resolution (procam 3562 has active a little more than 1920x1080, but the few extra pixels would likely be cropped).
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Old May 21st, 2005, 01:44 PM   #2861
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There's alot of jaggy edges on that image. It appears it was a lower res then resized larger with a bad resizer.
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Old May 21st, 2005, 02:15 PM   #2862
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More likely because of the simple debayer algorithim used. Simple debayer can cause colour fringing and all sorts of artifacts between high contrasting areas.
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Old May 21st, 2005, 04:03 PM   #2863
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I did not know that the color artifacts are from the de-Bayer..I was thinking it was a lens issue ;)

Keith did you happen to pickup and bookmark any of the links for high quality bayer algorithms in this thread? I can't seem to find them when I search...

we will need to try one of them when we can..
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Old May 21st, 2005, 06:55 PM   #2864
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So of the colour fringing between high contrast is easily attributed to bad debay. That looks to be the case for that because the fringing isn't as uniform as it would be as a lens issue, but it is hard to tell.

And unfortunately i never did bookmark any of the debayer.
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Old May 22nd, 2005, 12:09 AM   #2865
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Obin,
Congratulations and good luck with the new incarnation of your project. Way to go...
Have a loook at this CL script (dcraw) for Linux to convert RAW images from digital stills cameras by Dave Coffin, or look at this page to get more info. Could be a starting point.

Last edited by Valeriu Campan; May 22nd, 2005 at 12:33 AM.
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