Maybe a stupid question...(regarding human eye perception)

[fANMIR]

Hello...

I have very little knowledge about mpeg4 codecs but I have been using xvid for some time and the results are very good. I know there is a lumi masking option - kind of psychovisual. But what about colors - human eye is more sensible to yellow and less for the blue. Human eye sensibility is described by lambda curve (see attachment). So it is my question - is it possible to create a psychovisual procedure that will use these human eye properties. Or is it already in use? The problem is I think in colorspace - mpeg4 uses frequency domain and yuv colorspace...not rgb....sorry for my bad english...

[-h]

I have very little knowledge about mpeg4 codecs but I have been using xvid for some time and the results are very good. I know there is a lumi masking option - kind of psychovisual. But what about colors - human eye is more sensible to yellow and less for the blue. Human eye sensibility is described by lambda curve (see attachment). So it is my question - is it possible to create a psychovisual procedure that will use these human eye properties. Or is it already in use? The problem is I think in colorspace - mpeg4 uses frequency domain and yuv colorspace...not rgb....sorry for my bad english...

I'm not sure, but I thought the YUV colourspace already distributed more bandwidth to certain colours and less to others? I just don't know.

But yes, this is possible. However colour information makes up a small percentage of the overall video stream size (around 10%, the rest is the Y component), so you wouldn't get a big jump in compression.

-h