Research On Real Time Sketch Style Rendering Algorithm Based On GPU

Sketch style rendering has played an important role in None-Photorealistic Rendering research area, which has been widely adopted in art painting, video entertainment, and industrial design and so on. There is no doubt that it has broad application value. Compare with the traditional sketch painting, sketch style rendering is cheaper, easier and faster. However, the current sketch style rendering algorithms have some problems, including hard shadows rendering, mechanical contour line rendering and shower-Door problem. In order to solve these problems, this paper presents an advanced sketch style rendering algorithm. The main research work is as follows:As for hard shadows problem, presenting a new soft shadow rendering algorithm based on creating shadow lines. User can customize visibility value from shadow line data to change the range of soft shadow, which greatly enriches the final result become more space sense and level sense.As for mechanical contour line rendering problem, our algorithm combines multiple sampling and linear integral convolution (LIC) to render the contour line. We create the contour line textures group by using different kinds of filter operators which can detect different direction contour line from a texture. In the LIC stage, we use the weight distribution table which calculated by chi-square function to rebuild the contour line.As for Shower-Door Effect, presenting a texture rendering algorithm based on Multi-View. Our algorithm decreases the random factors that affect rendering process by reducing the number of white noise creating and generating scene reference diagram by Multi-View. The improved texture algorithm can render more stable texture for the video rendering and greatly reduce Shower-Door Effect.The several algorithms in this paper all have adopted programmable graphics hardware technique to accelerate. This paper use Direct3D 11 to create the experimental platform. According to requirement, our algorithm transplants the complex calculation to GPU for parallel computation. The experimental result shows that our algorithms can meet the demand of real-time rendering.