Canon DSLR Rumors

Video Aliasing Issues

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Video Aliasing Issues
The EOS 5D Mark II, 7D and 1D Mark IV (no word on the T1i) appear to be affected by the issue.

What’s the deal?
“The article by Barry Green is about the oft-reported “aliasing” artifacts in video from the Canon HDSLRs (5D Mark II, 7D, 1D Mark IV). Barry does a great job of backing up a few steps and defining the term aliasing.

Aliasing occurs when you sample something infrequently enough that you create an impression of something that wasn’t there. Imagine a blinking light in a room with a door. You must open the door to check the status of the light. If you open the door often enough, you get a pretty good picture of the status of the light, maybe something like on, on on, off off off, on on on, etc. Your samples are frequent enough to accurately represent the light’s activity.”

Read all about it at Planet5D

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“The article by Barry Green is about the oft-reported “aliasing” artifacts in video from the Canon HDSLRs (5D Mark II, 7D, 1D Mark IV). Barry does a great job of backing up a few steps and defining the term aliasing.

Aliasing occurs when you sample something infrequently enough that you create an impression of something that wasn’t there. Imagine a blinking light in a room with a door. You must open the door to check the status of the light. If you open the door often enough, you get a pretty good picture of the status of the light, maybe something like on, on on, off off off, on on on, etc. Your samples are frequent enough to accurately represent the light’s activity.”

14 responses to “Video Aliasing Issues”

  1. Don’t you DARE tell me what I can do with my own camera…
    Oh, hi t1i. Didn’t see you there. I guess I got aliasing.

  2. i had fixed the problem almost definitively testing with boris continuum complete vers 6
    by the DV FIXER PLUG INS its like magic
    you have to adjust iy by your scenario case individually,but with unsharp mask applyed
    after alias is no more a big trouble in certain condition i mean.
    on toolfarm i had seen they sell now on cheap unit.

  3. bellantonio 666 Reply:
    December 4th, 2009 at 4:31 pm
    i had fixed the problem almost definitively testing with boris continuum complete vers 6
    by the DV FIXER PLUG INS its like magic
    you have to adjust iy by your scenario case individually,but with unsharp mask applyed
    after alias is no more a big trouble in certain condition i mean.
    on toolfarm i had seen they sell now on cheap unit.

  4. The aliasing on the video of Canon stills cameras can be very bad because Canon uses line skipping to get the 1920 x 1080 resolution from the sensor.

    If the camera had a lot more on-board processing it could use the entire resolution of the sensor and then down sample (and sharpen) the output before recording it.

    Some cameras have much less aliasing than these, but they cost a lot more (ten times or even hundreds of times more).

    I’d call it a limitation of the technology brought about by the price point of the camera.

    Either live with it or shell out an awful lot more for a better camera.

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