Re: [WM]: ycbcr color model?

["firstname Lastname" <thisisforfun2000@hotmail.com>]

just thought to add ot that,

this is how tv broadcast is transimitted, for black and while tv ( well grey TV actually), it uses Y component only.

Mpeg standards uses this colour model as well.

>From: Angela Piper <amp08@uow.edu.au>
>To: <watermarking@watermarkingworld.org>
>Subject: Re: [WM]: ycbcr color model?
>Date: Wed, 4 May 2005 13:33:34 +1000
>
>The YCbCr model is one of the many 3-component colour models and is 
>obtainable from gamma corrected RGB through a linear transform.
>
>Y represents the luminance of the image (so viewing the Y component 
>only would give you a greyscale version of your image), the Cb 
>component (blue chrominance) describes the areas of blue/yellow and the 
>Cr component (red chrominance) describes the areas of red/green.
>
>The importance of this space is twofold:
>Firstly, it is thought to correspond reasonably well with how colour 
>signals are received by the brain (in that we perceive an area of 
>colour as bluish or yellowish but not both).
>More importantly, YCbCr provides excellent compression performance and 
>is thus widely used in image compression and component digital video.
>
>If you need more information I'd suggest you look for textbooks on 
>colour theory or image coding or perhaps take a look at Charles 
>Poynton's FAQ.
>
>Yours,
>	Angela.
>
>
>On Mon, May 02, 2005 at 12:50:06AM -0700, rajan sheth wrote:
> > hi friends
> >
> > inorder to extend the grayscale invisible algorithm to color images 
> > i
>came to know abt the use of "ycbcr"
> > color model.
> >
> > for that we have to convert the RGB values in to ycbcr model. and 
> > then
>apply the algorithm.
> >
> > can any one plz tell me more about the "ycbcr color model"(its basic
>explanation and importance).
> >
> > thanking you in advance.....
> >
> > waiting........
> > rajan
> >
>


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