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TCanny filter for VapourSynth
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README.md: clarify the operator used by op=1 #8

Closed AkarinVS closed 3 years ago

AkarinVS commented 3 years ago

The operator is not proposed by P. Zhou, but its use in improving the canny edge detector is. Also add the citation to the paper.

While we're at here, also add a citation to the paper.

Signed-off-by: akarin i@akarin.info