An Edge Mask

[mg262]

So, this is something that is used within an animation denoiser recently released by @TBL and myself, but there's no reason why it can't be used on its own:

http://people.pwf.cam.ac.uk/mg262/posts/Foreground/edgemask.jpg

To use it, get the Foreground filter from here:

http://people.pwf.cam.ac.uk/mg262/posts/Foreground/Foreground.HTML

and also load MaskTools. Then run the script:

source = ...# change this as appropriate
seeds1 = source.Blur(1).Blur(1).LocalMaxima.inflate.inflate.inflate.binarize(40, upper=false)
seeds2 = source.Blur(1).Blur(1).Blur(1).LocalMaxima.inflate.inflate.inflate.binarize(40, upper=false)
logic(seeds1, seeds2, "or")
greyscale

That script only looks at the luma when creating a mask; if you want one that considers the chroma as well, you can use utoy, etc. .