一种彩色视频图像序列的三维小波变换编码方法
AN ALGORITRHM FOR CODING COLOR VIDEO SIGNAL USING 3D-WAVELET TRANSFORMATION
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摘要: 该文给出了一种基于三维小波变换的彩色视频图像序列的编码方法。先将彩色视频图像序列的RGB(红绿蓝)色彩表示转换成YCbCr(亮度色度色度)表示,再将表示帧序的t坐标代换成z坐标,可将其看成是三维空间中的体。将其分成子块后,仿照二维图像小波变换的方法,对每个亮度色度分量做三维小波变换。变换后的各亮度色度分量的能量主要集中于低频波段,这些波段对该视频图像序列的视觉效果影响最大。将不同分量的各个不同波段按不同的精度量化并进行熵编码,可以达到去除帧内和帧间冗余,压缩数据的目的。试验表明,使用本方法可以达到较好的压缩效果。此方法较直观,速度也比较快。
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关键词:
- 小波; 三维小波变换; 彩色视频图像编码
Abstract: This paper presents an algorithm for coding color video signal using 3D-wavelet transformation. When the 3 color channels of RGB of the video signal are converted to color channels of YCbCr, and the frame order t of the signal is replaced by order z, this signal can be considered as 3 blocks in a 3D-space. Each block presents a color channel. After splitting each block into smaller sub-blocks, imitate the method of 2D-wavelet transformation for image, the sub-blocks can be transformed with 3D-wavelet. Most of energy of each color channel is in the transformed low-frequency bands. These bands affect the visual quality of the video signal most. After quantizing different bands with different precision and entropy coding each band, the intra- and inter-frame redundancy of the color video signal can be eliminated and the data can be compressed. Our simulation experiments show that this algorithm can obtain very good results. -
R.Koenen,Overview of the MPEG-4 standard,International Organization for Standardization,ISO/IEC JTC1/SC29/WG11,Coding of moving pictures and audio,ISO/IES JTC1/SC29/WG11 N2725,March 1999/Seoul,South Korea ［2］C.K.Chui,An Introduction to Wavelets,Academic Press,Inc.,USA.,1992,66-229.[2]W.Sweldens.The Construction and application of wavelets in numerical analysis:Ph.D.Thesis,Belgium:Department of Computer Science,Katholieke Universiteit Leuven,May 25,1994,11-191.[3]G.M.Davis,A.Nostratinia,Wavelet-based image coding.An overview,Applied and Computational Control,Signals and Circuits,1998,1(1):11-55.[4]M.L.Hilton,B.D.Jawerth,A.Sengupta,Compressing still and moving images with wavelets,Multimedia Systems,1994,2(3):1-19.[5]伍鹏,张妙兰,李象霖,基于分块三维小波变换的视频图像序列编码方法的研究.电子科学学刊,1999,已接收,即将发表.[6]J.D.Villaseuor,B.Belzer B,J.Liao,Wavelet filter evaluation for image compression,IEEE Trans.on Image Processing,1995,Preprint. ［8］A.C.Popat,Scalar quantization with arithmetic coding,M.S.Thesis,Boston:Department of Electrical Engineering.Massachusetts Institute of Technology,1990,18-82. -
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