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There are some texture filters I used in my previous work:

filterBlurredContours:
Draws an image from continuous lines.

filterContour:
Finds a contour, or edges on a picture.

filterEdge:
Just a high-pass filter.

filterOneSideLine:
Draws a border line around white places on a picture.

filterSlowDown:
surprisingly very useful effect
It's handy to slow down visual effect. It can make a motion blur, or it can slowly show your effect instead of to let it appear suddenly.

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