Temporal Coherent Sketch Rendering using Background Image

Chang, Jae-Khun; Kim, Youung Kwon; Seung-Taek Ryoo

doi:10.34163/jkits.2017.12.3.005

Video based stylized rendering have temporal coherence problems occurred by illumination and shape difference in corresponding pixel between previous and current frame. Especially, the rendered image is distorted in the background part rather than the foreground part. In this paper, we suggest original image correction method using background image to reduce flickering effect at background part in correction step and post blurring method using rendered image to improve sketch rendering effect in rendering step. In correction step, video frames can be input through video file or web camera, and then the original video frames can be corrected by using the frame difference between original and background image. In rendering step, we transform corrected frame into grayscale image and invert the color. And then we blur the inverted frame using bilateral filtering and apply color dodge algorithm in the blurred frame. To reduce flickering effect and improve sketching effect, post-blurring method using bilateral filtering is applied again in the rendered frame. Correction method using background image can be reduced flickering effect caused by the difference between previous and current frame. Also, post-blurring method using bilateral filtering can be represented smooth sketch rendering through removing unnecessary noise. Suggested method can be applied to realtime rendering and can be used in various fields such as image and game contents generation.

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* 2022년 이후 발행 논문의 참고문헌은 현재 구축 중입니다.

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