🚀 go-pugleaf

In article <116780001@hplred.HP.COM> fitzhugh@hplred.HP.COM (Andrew Fitzhugh) writes:
>/ hplred:comp.multimedia / pej@hpfcso.FC.HP.COM (Phil Jensen) /  6:04 am  Jul 27, 1992 /
>> In comp.multimedia, soam@freyja.cs.cornell.edu (Soam Acharya) writes:
>> > Can anyone point me towards a reference that explains how to convert
>> > 4:1:1 subsampled YUV data to RGB? 
>> > 
>> 
>> Call your local Signetics Rep and ask for the Phillips Video Data Handbook.
>> This contains specs on the parts that are on your board. Look at the SAA7192
>> Digital Colour Space Converter. This is a YUV to RGB converter. Included are 
>> equations for the YUV to RGB conversion.
>
>Actually, the Signetics book gives the equations for YCbCr (normalized
>YUV, so they're essentially the same).  I just happened to be typing
>in these numbers so I can save you some time:
>

I sent mail to the original poster, the problem is that the chip set
used on the VideoPix hardware is the SAA9051. This is not compatible
with the YUV to RGB converter chip listed above. (If I am wrong
someone will hopefully correct me.)

The VideoPix equations, as given to me by Phillips for the SAA9051
are,

	/*
	 * Philips YUV to RGB. These
	 * aren't the same as standard YUV to RGB.
	 * The equations are
	 *
	 * R = 1.1759*Y + 1.2743*V
	 * G = 1.1759*Y - 0.3184*U - 0.6335*V
	 * B = 1.1759*Y + 1.674*U;
	 */




--
David Berry, david.berry@sun.com

"Humans don't have a zoom function. - Kryten, Red Dwarf"