Region of interest-based H. 265 video quality improvement method

• Main Authors: HUANG JINHAI, LIAN QI, ZHOU JIANZHENG, YU LIZHU, SUN JUNJIE
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2017
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

The present invention discloses a region of interest-based H. 265 video quality improvement method. The objective of the invention is to improve subjective visual quality and maintain bit rate control accuracy. According to the method of the invention, a new graph-based saliency model is put forward; the region of interest of a current frame is estimated through a time-space domain saliency graph, so that the region of interest (ROI) can be determined, and frame-level and largest coded macroblock (LCU)-level bit allocation are guided; and for the problem of video quality smoothing, the adjustment of lambda values and QP values in the space domain and the time domain is restricted respectively. As indicated by experimental results, the algorithm can make an output bit rate reach a target value, and improve the peak area signal-to-noise ratio (PSNR) of the region of interest (ROI) of a video frame, and therefore, the overall subjective visual quality of a coded sequence is greatly increased compared with that o