The old function uses PIL to save the image, which is not in the
requirements file. As we are already requiring opencv, use that to save
images instead of an additional dependency
Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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