Re: [video] Re: question

["andrewxue" <andrewxue@vimicro.com>]

Hi Richard,

Really thanks for your reply,

For RGB converted into YUV,I see following equation,
    Y = 0.2999R + 0.587G + 0.114B
    U = 0.492(B-Y)
    V = 0.877(R-Y)
I am not sure you implement the design by this formula or anything else ?

For Y/C generation,I think it need first create YCbCr format color space,and also there is some formula as the above one could create YCbCr signals,but how YCrCb convert into composite signal is still unclear for me,could you tell me how/where I can get the reference/document for this algorithm,

Best Regards,
Andrew

----- Original Message ----- 
From: "Richard Herveille" <richard@asics.ws>
To: <video@opencores.org>
Sent: Monday, October 21, 2002 3:12 PM
Subject: Re: [video] Re: question


> 
> In fact, I do.
> Your problem isn't easy to explain; you need to do a number of things.
> From top to bottom (e.g composite video relies on Y/C):
> 
> - Create composite video signal (i.e. TV signal)
> - Create Y/C signals
> - Create YUV (or YCrCb for digital signals)
> 
> Converting the UV (or CrCb) signals into the Chroma ("C") signal is the not 
> easy part. You need to use sine/cosine translations (probably using a cordic 
> algorithm, available from opencores) to translate them.
> 
> Please be more specific about your problem and I can give some more detailed 
> information.
> 
> Richard
> 
> 
> > Hi Richard,
> >
> > So this mail list is for image IP developer discussion ? I want to ask a
> > question,is there anyone have experience in TV interface design like TV
> > encoder,my question is how the digital image signal(RGB pixel) be modulated
> > into composite/component signal,
> >
> > Best Regards,
> > Andrew
> >
> > ----- Original Message -----
> > From: "Richard Herveille" <richard@asics.ws>
> > To: "andrewxue" <andrewxue@vimicro.com>; <video@opencores.org>
> > Sent: Thursday, October 17, 2002 6:01 PM
> > Subject: Re: question
> >
> >
> >
> > Hi Andrew,
> >
> > This mailing list is dedicated to video systems in general, and digital
> > video systems/image processing in particular. Anything you want to discuss
> > can be discussed.
> >
> > Currently this list is kinda quite, mostly because there's not a lot of
> > activity in developing imaging cores. But it is supposed to change.
> >
> > Richard
> >
> > > Dear,
> > >
> > > I am a newcomer for this mail list.I am really interested in video &
> > > image processor design and also want to learn from expert guys and also
> > > share my experience with others.But as fresh guy,I am not sure the vidoe
> > > aspect you are discussing and  interested in.So could you update me some
> > > reference or hot topic of this mail list,
> > > Best Regards,
> > > Andrew
> 
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