From: lweng@analogic.com
Subject: HELP! YUV-RGB convertion
Date: 12 Dec 1997 00:00:00 GMT
Message-ID: <881940406.483262472@dejanews.com>
To: ychen@analogic.com
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I want to display a YUV 422 image on the computer SVGA monitor, but there
is only color information in one of the two pixels. I tried to
interpolated using the neighbor pixel's color information, so I can get
YUV 444 format data. Then I used  the formula shown below to converter
the YUV 444 data to RGB 888:

      Y = 0.257R' + 0.504G' + 0.098B' + 16
      U = -.148R' -0.291G' + 0.439B' + 128
      V = 0.439R' -0.368G' -0.071B' + 128

      R' = 1.164(Y -16) + 1.596(V-128)
      G' = 1.164(Y-16) -0.392(U -128) -0.813(V-128)
      B' = 1.164(Y -16) + 2.017(U -128)

The result is almost satisfied except that some extra color has been
added in some region of the image. I just don't know how to handle those
extra color right now.

The formula is just fine, I test it by converter a RGB 888 image to YUV
444 and back to RGB 888.

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