码率恒定小尺寸视频流DCT编码二次插值优化  

Stable Rate of Video Stream in Small Size Screen Based on DCT Coding Quadratic I nterpolation Optimization

作　　者：何志坚[1] 曹冲[1] 张立文[1] 宋占伟[1] 

机构地区：[1]吉林大学电子科学与工程学院,长春130012

出　　处：《吉林大学学报（信息科学版）》2012年第1期30-34,共5页Journal of Jilin University（Information Science Edition）

基　　金：吉林省科技支撑计划重点基金资助项目(20100314)

摘　　要：为了在小尺寸屏幕上保持码流恒定,以使视频流清晰,在帧内预测编码的基础上,提出了一种改进的DCT(Discrete Cosine Transform)编码二次插值优化算法。该算法根据帧内预测编码的DCT变换机制,利用DCT编码的二次插值可以使码流恒定,小尺寸屏幕的块效应减弱,在保持视频流速度稳定的情况下,提高了图像的清晰度。实验结果表明,传统DCT变换在小尺寸屏幕的限制下,块效应明显,而且编码的复杂度较高,而DCT编码二次插值明显比传统算法图像清晰,而且保持了码流的恒定。The size of the screen for popular mobile phones are small currently. In order to maintain the clear video stream without fluctuation,on the basis of the intra prediction encoding, an improved quad- ratic interpolation of DCT（Discrete Cosine Transform） coding optimization algorithm is proposed. Based on intra prediction coding of DCT mechanism,the quadratic interpolation using DCT coding can make a constant stream,make the small size of the screen blocking reduced,and make the video stream enhance clarity while maintaining the speed stability of the image. Experimental results show that traditional DCT transform in the small size of the screen block effects are more obvious, and coding is more complex. The DCT coding algorithm quadratic interpolation makes the image significantly clear, and also maintain a constant stream.

关 键 词：DCT变换 帧内预测编码 二次插值 

分 类 号：TP311.5[自动化与计算机技术—计算机软件与理论]