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| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2013-06-18 21:41:59 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-18 08:49:07 -0300 |
| commit | 3f359a7cb1847900bc87b3498f72c1ee848942a7 (patch) | |
| tree | 8e3aa4ac57bca83681cef003de048886d51e578e /Documentation/DocBook | |
| parent | 5045b495196a624c17a1ef271cbdaa6d3e2d1097 (diff) | |
| download | op-kernel-dev-3f359a7cb1847900bc87b3498f72c1ee848942a7.zip op-kernel-dev-3f359a7cb1847900bc87b3498f72c1ee848942a7.tar.gz | |
[media] v4l: Fix colorspace conversion error in sample code
The sample code erroneously scales the y1, pb and pr variables from the
[0.0 .. 1.0] and [-0.5 .. 0.5] ranges to [0 .. 255] and [-128 .. 127].
Fix it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/pixfmt.xml | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml index 16db350..72d72bd 100644 --- a/Documentation/DocBook/media/v4l/pixfmt.xml +++ b/Documentation/DocBook/media/v4l/pixfmt.xml @@ -391,9 +391,9 @@ clamp (double x) else return r; } -y1 = (255 / 219.0) * (Y1 - 16); -pb = (255 / 224.0) * (Cb - 128); -pr = (255 / 224.0) * (Cr - 128); +y1 = (Y1 - 16) / 219.0; +pb = (Cb - 128) / 224.0; +pr = (Cr - 128) / 224.0; r = 1.0 * y1 + 0 * pb + 1.402 * pr; g = 1.0 * y1 - 0.344 * pb - 0.714 * pr; |
