Parallel pencil drawing stylization via structure-aware optimization

This paper presents a non-photorealistic rendering technique for stylizing a photograph in the pencil drawing style, which can well preserve the fine structure of the original image. We first construct a structure map from the anti-color image of the original image to model the detailed underlying fine structure of the original image, and generate a coarse pencil drawing image with line integral convolution. Then we refine the coarse pencil drawing image with the structure map for enrich the structure information. The presented algorithm is highly parallel allowing a real-time performance with GPU implementation. Experimental results show that our approach can produce more attractive and impressive pencil drawing effects with a variety of photographs.