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Canon XL H Series HDV Camcorders
Canon XL H1S (with SDI), Canon XL H1A (without SDI). Also XL H1.


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Old August 19th, 2006, 02:18 PM   #1
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XLH1 Video Quality Issue - SD

I have been very happy with it, but I have noticed that in RAW and compresed video I get oscillating light fluctuations in shiny areas of glasses, or the chrome in chairs, etc. with movement. Is this what some call artifact? It could be my amatuer inabilities but what can be done? Is there a production effect to add to remove it? I am shooting in 30 fps in AV Mode.
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Old August 19th, 2006, 05:51 PM   #2
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That's not typical compression artifact, but not sure what it actually is. If shooting Tv under some artifical lights (eg halogen or mercury vapor, as noted on p72 of the user manual...and I've seen that happen), you can get an effect like that. But in Av, I don't know; haven't seen it in that mode and not mentioned in the manual. Do you have a sample clip you can post to make sure we're talking about the same thing?
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Old August 22nd, 2006, 09:36 AM   #3
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Here ya go. This is not the best example but note that the problem is worse on larger reflective items. MPG encoding covers up the small stuff.
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File Type: zip ShinyFrames-1.zip (1.52 MB, 927 views)
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Old August 22nd, 2006, 08:46 PM   #4
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Hi David

I'm not sure I'm seeing much of anything, other than a little aliasing. It's difficult to tell as it is so short, and has little movement, but I'm guessing that you are simply seeing line "twitter" (aliasing) which is a normal component of DV quality video image. If you have a clip that shows the problem more obviously, it would help.

Barry
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Old August 23rd, 2006, 12:16 PM   #5
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Classic aliasing.
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Old September 3rd, 2006, 02:07 PM   #6
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Can anything be done to help prevent it? This means I cant use the XLH1 for TV Quality commercials.
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Old September 3rd, 2006, 08:38 PM   #7
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Hi David. This is a common problem on my XL2 as well. Basically, the lens is able to resolve finer details than the SD resolution CCD can capture without aliasing occurring. Ideally, there would have been a low pass filter before the A/D conversion of the CCD output to prevent this but it's not an ideal world. :)

On my XL2, I find that the Century Optics 0.7X converter softens the image just enough to largely avoid this aliasing problem.

If your commercial can take something like a classis soft filter, it might be worth trying in order to reduce the sharpness. The camera has a sharpness adjustment built-in, but it's probably done digitally i.e. after the A/D conversion so doesn't help the aliasing much.

Richard
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Old September 4th, 2006, 07:26 AM   #8
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I believe the XL-H1 does have some anti aliasing filtering built in because the aliasing is much, much less pronounced than with preveious XL cameras. Aliasing can often be dealt with simply by changing the position/angle of the camera so try a slightly different composition.
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