MaskTools/EdgeMask
From Avisynth wiki
EdgeMask (clip[, int "thY1"[, int "thY2"[, int "thC1"[, int "thC2"[, string "type"]]]]])
Plugin: MaskTools
This filter creates an edge mask of the picture. The edgefinding algorithm uses a convolution kernel, and the result of the convolution is then thresholded with thY1 and thY2 (luma) and thC1 and thC2 (chroma). The thresholding happens like that (r is the result of the convolution):
 r <= th1 gives 0.
 th1 < r <= th2 gives r.
 th2 < r gives 255.
In order to create a binary mask, you just have to set th1=th2.
The choice of the convolution kernel is done by type:
type  Kernel  

"roberts" 
 
"sobel" 
 
"laplace" 
 
"special" 

Finally, there are also two other possible values for type ("cartoon" and "line"), which have behaviors which are not documented here.
Defaults are : thY1 = 0, thY2 = 20, thC1 = 0, thC2 = 20 and type = "sobel".
Back to MaskTools.