Package details
This tool tries to find a suitable clipping border for a series of gray images.
It is very useful to automatically extract clipping values for transcoding a
movie if the source frame is encoded with black bars.
A border around an image is defined by a rectangular and homogenous valued area
extending from each edge of the image (e.g. the black bars around a movie
frame). For each image the largest clip border is determined and the smallest
common region of the image series is returned. Empty images or images with no
valid clipping region are ignored.
To cope with noisy regions in the black border areas, the region finding
algorithm does not simply cut away all regions with purely zero values, but it
uses a threshold in the absolut gradient sum along rows and columns as a hint
for the begin of real image contents.
You need a frame processing tool like transcode to actually perform the
clipping operation.
Authors: chris@lallafa.de
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