Gabor Filter - Hair Extraction v1.5
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13.1 or later
Linux, Mac, Windows
Fine hair keying using Gabor filtering
This gizmo uses the magic of Gabor filtering to provide a way for detecting elongated features (like fine hair strands).
It should be pretty simple to use.
The node outputs the filtered image in the 3 rgb channels. A strong contrast on the source image will give stronger, better results. If you're using it on green screen for hair extraction, you generally will use the green channel only as it is the one with the strongest contrast between the strands and the background.
Then, you can use a merge node with operation 'plus' to add the hair details to your existing alpha (IBK or anything else)
I've added a small help text for every control knob. Don't hesitate to hover the cursor on those if you want information on what they do.
This gizmo comes from an idea presented in Chloe Legendre's SIGGRAPH paper from 2017 'Improved Chromakey of Hair Strands via Orientation Filter Convolution'