avfilter: add sobel and prewitt filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 2acf770f48..ff0ac50997 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -10860,6 +10860,23 @@ Set medium thresholding (good results, default).
 @end table
 @end table
 
+@section prewitt
+Apply prewitt operator to input video stream.
+
+The filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes will be processed, unprocessed planes will be copied.
+By default value 0xf, all planes will be processed.
+
+@item scale
+Set value which will be multiplied with filtered result.
+
+@item delta
+Set value which will be added to filtered result.
+@end table
+
 @section psnr
 
 Obtain the average, maximum and minimum PSNR (Peak Signal to Noise
@@ -12714,6 +12731,23 @@ asendcmd='5.0 astreamselect map 1',astreamselect=inputs=2:map=0
 @end example
 @end itemize
 
+@section sobel
+Apply sobel operator to input video stream.
+
+The filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes will be processed, unprocessed planes will be copied.
+By default value 0xf, all planes will be processed.
+
+@item scale
+Set value which will be multiplied with filtered result.
+
+@item delta
+Set value which will be added to filtered result.
+@end table
+
 @anchor{spp}
 @section spp