0
$\begingroup$

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

$\endgroup$
  • $\begingroup$ What is the input format to each capture card? Analog RGB, or ??? $\endgroup$ – hotpaw2 Apr 15 '14 at 23:42
1
$\begingroup$

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.

| improve this answer | |
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.