Abstract: Non-photorealistic rending (NPR) has already become one of the most active
research topics in current computer graphics domain. NPR, which is established on human
cognition, takes advantage of computer to generate various artistic graphics. Yunnan
out-of-print woodcuts are the typical representative of Yunnan local minorities’ characteristic
painting. Through exploring and analyzing its actual creation process, we reveal its feature and
laws in creation techniques and in the usage of strokes, texture and color, which is crucial for us
to explore and research the key techniques of Yunnan out-of-print woodcuts’ digital simulation
and synthesis based on image. Based on the research described above, this paper primitively
explores and implements the scratch simulation and synthesis based on Line Integral
Convolution, color-mixture based on multi-frequency noise LIC textures and texture synthesis
of the scratch.

Key words: non-photorealistic rending, Yunnan out-of-print woodcuts, line integral
convolution, multi- frequency noise, texture synthesis