Re: [video] about DCT

[konstantinos_aris@hotmail.com]

> 
> The DCT algorithm computes on a 8x8 pixel block. However for 
> multicolor pixels 
> you need to do a multicolor DCT. This means that the DCT algorithm 
> operates 
> on one color only. Therefore for RGB you need to computer all three 
> colors 
> per pixel. This means that for an RGB pixel you need to do 3x as 
> much 
> computations than for a b/w pixel. 
> This is where RGB(4:4:4) to YCrCb(4:2:2) provides a significant 
> improvement. 
> You only need to do half of the computations for the color 
> components, 
> thereby reducing your computation requirements considerably. 
> 
So is that means after converting the color space, DCT algorithm 
processes the luminance Y in more detail that the other two 
chrominance components right?
So that using YCbCr is more favorable. 

Bingo! Thanx..

Cheers,
Aris
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