2011/7/11 Christian Gmeiner <[email protected]>: > Hi Laurent, > > 2011/7/11 Laurent Pinchart <[email protected]>: >> Hi Christian, >> >> On Sunday 10 July 2011 20:14:21 Christian Gmeiner wrote: >>> Signed-off-by: Christian Gmeiner >>> --- >>> diff --git a/Documentation/DocBook/media/v4l/subdev-formats.xml >>> b/Documentation/DocBook/media/v4l/subdev-formats.xml >>> index 49c532e..18e30b0 100644 >>> --- a/Documentation/DocBook/media/v4l/subdev-formats.xml >>> +++ b/Documentation/DocBook/media/v4l/subdev-formats.xml >>> @@ -2565,5 +2565,43 @@ >>> </tgroup> >>> </table> >>> </section> >>> + >>> + <section> >>> + <title>YCrCb Formats</title> >>> + >>> + <para>YCbCr represents colors as a combination of three values: >>> + <itemizedlist> >>> + <listitem><para>Y - the luminosity (roughly the >>> brightness)</para></listitem> >>> + <listitem><para>Cb - the chrominance of the blue >>> primary</para></listitem> >>> + <listitem><para>Cr - the chrominance of the red >>> primary</para></listitem> >> >> How does that differ from YUV ? > > > I need to say that I am very new to this whole format stuff and so I > am not really sure. > In the data sheet > http://dxr3.sourceforge.net/download/hardware/ADV7175A_6A.pdf there is > on the > first page a FUNCTIONAL BLOCK DIAGRAM which shows that there is a > "YCrCb to YUV Matrix" > stage in the pipeline. I am also fine to use a YUV format for the media bus. > Any suggestions?
Okay I think I have found the difference between YUV and YCrCb - see [1] YCbCr 4:2:2 (Redirected from YUV 4:2:2) FourCCs: YUY2, UYVY, YUV2 (Apple Component Video stored in MOV files) Samples: http://samples.mplayerhq.hu/V-codecs/YUV2/ (These FourCC names only reflect that the YCbCr of digital media is often falsely mixed up with analog PAL's YUV color space.) YCbCr 4:2:2 is a packed YCbCr format in which a pair of consecutive pixels is represented by 1 Y sample each but share a Cb sample and a Cr sample. This type of data may be packaged in a container format with a a FourCC of YUY2 which indicates the following byte formatting: [1] http://wiki.multimedia.cx/index.php?title=YUV_4:2:2 Greets, -- Christian Gmeiner, MSc -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
