Mr. Mingsong Guo Profile

Mingsong Guo

at Ningbo Univ

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Proceedings Article | 4 November 2014 Paper

A depth video processing algorithm for high encoding and rendering performance

Mingsong Guo, Fen Chen, Chengkai Sheng, Zongju Peng, Gangyi Jiang

Proceedings Volume 9273, 92730O (2014) https://doi.org/10.1117/12.2073478

KEYWORDS: Video, Video processing, Video coding, Computer programming, Video compression, Cameras, Optical filters, Gaussian filters, Information science, 3D vision

Read Abstract +

In free viewpoint video system, the color and the corresponding depth video are utilized to synthesize the virtual views by depth image based rendering (DIBR) technique. Hence, high quality of depth videos is a prerequisite for high quality of virtual views. However, depth variation, caused by scene variance and limited depth capturing technologies, may increase the encoding bitrate of depth videos and decrease the quality of virtual views. To tackle these problems, a depth preprocess method based on smoothing the texture and abrupt changes of depth videos is proposed to increase the accuracy of depth videos in this paper. Firstly, a bilateral filter is adopted to smooth the whole depth videos and protect the edge of depth videos at the same time. Secondly, abrupt variation is detected by a threshold calculated according to the camera parameter of each video sequence. Holes of virtual views occur when the depth values of left view change obviously from low to high in horizontal direction or the depth values of right view change obviously from high to low. So for the left view, depth value difference in left side gradually becomes smaller where it is greater than the thresholds. And then, in right side of right view is processed likewise. Experimental results show that the proposed method can averagely reduce the encoding bitrate by 25% while the quality of the synthesized virtual views can be improve by 0.39dB on average compared with using original depth videos. The subjective quality improvement is also achieved.

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