I have just bought a new video capture card whose output format is YUV 4:2:2 (as my old one) and surprisingly when I capture images with both cards I get different results. Differences are very small (have to zoom on edges if you want to see something) but I would like to know where do they come from? I was wondering if it was the transformation:

YUV 422 -> YUV 444

That could change from one driver to another?

Here is the original image: enter image description here

Here is the capture with my old card: enter image description here

Here is the capture with my new card: enter image description here

  • $\begingroup$ What is the input format to each capture card? Analog RGB, or ??? $\endgroup$
    – hotpaw2
    Commented Apr 15, 2014 at 23:42

1 Answer 1


4:2:2 means the color information has half the horizontal sample rate compared to the luminance. Depending on the input, this lower sample rate may require having a low pass filter in the color channels. Different cards may use different filters in phase and frequency response, resulting in slightly different results near any sharp transitions.


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