paul@manray.asd.sgi.com (Paul Haeberli) (05/09/90)
This is a uuencoded program called fromyuv that converts an
Abekas A60 digital video format to IRIS image file format.
To use the program:
% rcp guest@chuck:356.yuv . # gets an image from the Abekas
% fromyuv 356.yuv image.rgb # makes a 720 by 486 image
If you want to use square pixels, use the -s option and
the program will scale the output image:
% rcp guest@chuck:356.yuv . # gets an image from the Abekas
% fromyuv 356.yuv image.rgb -s # makes a 640 by 486 image
begin 777 fromyuv
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endspl@duck.ncsc.org (Steve Lamont) (05/09/90)
In article <59662@sgi.sgi.com> paul@manray.asd.sgi.com (Paul Haeberli) writes: >This is a uuencoded program called fromyuv that converts an >Abekas A60 digital video format to IRIS image file format. ... why not just rcp the file in RGB from the A60 and do the conversion on the fly? Seems it would be easier to me... Just issue the command rcp yourAbekas:[framenumber].rgb file.rgb You then have rgb pixels that can be read by anything. spl (the p stands for pixel pusher) -- Steve Lamont, sciViGuy (919) 248-1120 EMail: spl@ncsc.org NCSC (The other one), Box 12732, Research Triangle Park, NC 27709 Don't send in no bums. I want deals. -John Steinbeck, _The Grapes of Wrath_
mike@BRL.MIL (Mike Muuss) (05/09/90)
Steve Lamont suggests having the A60 perform the YUV--RGB conversion internally. My own timings with this show that the A60 takes about 20 additional seconds to perform the conversion. After all, it only has a 68000 CPU. So, YUV transfer takes about 5 seconds, RGB transfer takes 25 seconds. Our Cray XMP can perform the conversion in well under a second, and an SGI 4D/2xx CPU can do it in a second or two, so moving the conversion operation out of the A60 and into you host usually saves a lot of elapsed time. Since I usually have a lot of images to send, 20 seconds/frame means a lot to me! Best, -Mike
spl@duck.ncsc.org (Steve Lamont) (05/10/90)
In article <9005091237.aa00610@VMB.BRL.MIL> mike@BRL.MIL (Mike Muuss) writes: >Steve Lamont suggests having the A60 perform the YUV--RGB conversion >internally. > >My own timings with this show that the A60 takes about 20 additional seconds >to perform the conversion. After all, it only has a 68000 CPU. >So, YUV transfer takes about 5 seconds, RGB transfer takes 25 seconds. > >Our Cray XMP can perform the conversion in well under a second, and an >SGI 4D/2xx CPU can do it in a second or two, so moving the conversion >operation out of the A60 and into you host usually saves a lot of elapsed time. > >Since I usually have a lot of images to send, 20 seconds/frame means a lot >to me! Actually, I do the same thing going from RGB to YUV. I have a similar utility to the one posted -- vectorizes nicely, too :-). What I was wondering about was going *from* the Abekas back to a computer. It seemed to me that that was a rare thing to do (unless you're using the 601 stuff [did I get that right?] for frame grabbing). I suppose that if you're doing a lot of that, the YUV->RGB dingus might be handy, at that. BTW, can we get *source* for that YUV->RGB thingy, Paul? spl (the p stands for pixel-ated) -- Steve Lamont, sciViGuy (919) 248-1120 EMail: spl@ncsc.org NCSC (The other one), Box 12732, Research Triangle Park, NC 27709 Don't send in no bums. I want deals. -John Steinbeck, _The Grapes of Wrath_