低碼率下h.264碼率控制跳幀插幀算法研究

1、南京郵電大學(xué)碩士學(xué)位論文低碼率下H.264碼率控制跳幀/插幀算法研究姓名：王瑾申請學(xué)位級別：碩士專業(yè)：信號(hào)與信息處理指導(dǎo)教師：朱秀昌2011-03南京郵電大學(xué)碩士研究生學(xué)位論文 Abstract II Abstract With the rapid development of the multimedia c

2、ommunication technology, efficient and high quality compression digital video transmission technology has become one hot topic of the research and development nowadays. As a new generation of video coding standard, H.264

3、 has high coding efficiency and wide application prospects by using a series of new technologies. In order to get higher reconstruction video quality in the variable channel bandwith, the rate control technology is used

4、to control the bitrate. Based on the thorough research of rate control principle and algorithm in H.264, the frame skipping algorithm of the rate control in the low bit rate is researched and improved. Contrasting the or

5、iginal passive frame skipping algorithm, a new active frame skipping algorithm is propsed in this paper. By fully considering the complexity of image motion, the encoded frame quality and the occupancy of the encoding bu

6、ffer, the proposed algorithm can adaptively decide whether to skip the next frame, which makes bit allocation of the video sequence more rationally. Corresponding to the encoder, the interpolation algorithm used at the

7、decoder is also improved in this paper. The improved algorithm uses the bilateral motion vector estimation for the motion-compensated frame interpolation and smooths the motion vector twice in the motion vector estimatio

8、n. Using the adjusted motion vector in the motion-compensated frame interpolation and considering the situation in which the pixels pointed by the motion vector are over the image boundary, the subjective quality and PSN

9、R of the decoded frames are improved. The simulation experiments of the algorithm are on MATLAB and JM10.2. The experiments results show that the visual quality and PSNR with the proposed algorithm are improved comparing

10、 with the original frame interpolation algorithm by using the more accurate motion vector estimation; the visual quality and PSNR with the proposed active frame skipping algorithm are improved comparing with the orginal