局部運(yùn)動(dòng)場景中運(yùn)動(dòng)對象的壓縮域分割算法
Compressed Domain Moving Object Segmentation in Local Motion Scene
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摘要: 壓縮域視頻運(yùn)動(dòng)對象的分割技術(shù)近年來逐漸被人們所重視,并且成為較實(shí)用的技術(shù)之一.該文針對目前壓縮域中運(yùn)動(dòng)對象分割質(zhì)量不高的問題,提出一種壓縮域分割的改進(jìn)算法.該算法首先從MPEG壓縮碼流中提取運(yùn)動(dòng)矢量,并對矢量進(jìn)行運(yùn)動(dòng)累加和中值濾波處理,最后利用貝葉斯風(fēng)險(xiǎn)決策對非零運(yùn)動(dòng)矢量區(qū)域進(jìn)行校正,最終得到較好的分割結(jié)果.該文還定義了壓縮域分割質(zhì)量的評價(jià)參數(shù)分割率和錯(cuò)分率,為評價(jià)壓縮域的分割結(jié)果提供了客觀評價(jià)標(biāo)準(zhǔn).
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關(guān)鍵詞:
- MPEG;分割;壓縮域
Abstract: More and more attention has been paid to the study of moving object segmentation in MPEG compressed domain these years, which has already developed into a practical technology. In this paper, an algorithm by using motion vectors and DCT coefficients is put forward for segmenting moving object in MPEG compressed domain. As regards local motion scene, the algorithm produces a better result of segmentation than currently adopted ones. Firstly, the motion vectors are processed by accumulation and median filter; then the areas of non-zero motion vectors are rectified by the Bayesian decision to get high-quality segmentation. -
Venkatesh R, Ramakrishnan K R. Content-based video retrieval using motion descriptors extracted from compressed domain.IEEE International Symposium on Circuits and Systems(ISCAS),Arizona, 2002, vol. 4:141 - 144.[2]Venkatesh R, Ramakrishnan K R. Compressed domain motion segmentation for video object extraction. Intl Conf. on Acoustics,Speech, and Signal Processing, Orlando, Sept. 2002, vol.4:3788 - 3791.[3]Wang H, Chang S F. A highly efficient system for automatic face region detection in MPEG video[J].IEEE Trans. on Circuit and System for Video Technology.1997, 7(4):615-[4]Orachat Sukmarg, Rao K R. Fast object detection and segmentation in mpeg compressed domain. TENCON 2000,Kuala Lumpur, Malaysia, Sept. 2000:1769 - 1770.[5]Eng How-Lung, Ma Kai-Kuang. Spatiotemporal segmentation of moving video objects over mpeg compressed domain[J].IEEE IntlConf. on Multimedia and Expo(ICME), New York.2000, Vol.3:1531-[6]Ji Salkmann, Park Hyun Wook. Moving object segmentation in DCT-based compressed video[J].Electronics Letters.2000, 36(21):1769-[7]ISO/IEC.JCT1/SC29 CD11172-2, MPEG1, international standard for coding of moving pictures and associated audio for digital storage media at up to about 1.5Mb/s. 1991.[8]ISO/IEC.JCT1/SC29 CD13818-2, MPEG2, coding of moving pictures and associated audio. 1993. -
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