find_rect

Find a rectangular object

It accepts the following options:

'object'

Filepath of the object image, needs to be in gray8.

'threshold'

Detection threshold, default is 0.5.

'mipmaps'

Number of mipmaps, default is 3.

'xmin, ymin, xmax, ymax'

Specifies the rectangle in which to search.

Command line examples

• Generate a representative palette of a given video using ffmpeg:

  ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv