Here`s a couple way`s to make scroll saw portrait`s with photoshop. In Photoshop go to,Filter > Sketch > Torn Edges, Play with the Image Balance, Smoothness and Contrast adjustments, to get the picture you want.
Another way in photoshop is to go to Filter > Sketch > Stamp, Play with the Light/Dark Balance and Smoothness adjustments to tweak the picture. Might not be nothing new but I haven`t found anything for making portrait patterns with photo shop.
John