avfilter: add roberts cross operator
authorPaul B Mahol <onemda@gmail.com>
Mon, 19 Jun 2017 10:54:29 +0000 (12:54 +0200)
committerPaul B Mahol <onemda@gmail.com>
Mon, 19 Jun 2017 12:04:44 +0000 (14:04 +0200)
Signed-off-by: Paul B Mahol <onemda@gmail.com>

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