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Performance enhancement of animated images compression using videoconferencing Techniques

Shima'a kthir saleh

journal of the college of basic education مجلة كلية التربية الاساسية
ISSN: 18157467(print) 27068536(online) Year: 2010 Volume: 15 Issue: 63 Pages: 37-48
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Abstract

A digital image is defined as visual representation of meaningful data within spatial domains. Aarranging certain number of digital images successively is called animated image or video. Digital video is video information that is stored and transmitted in a digital form. Digital video has been used for a number of year ,for example, in the television broadcasting industry. Most digital image contain high degree of redundancy, which means that an efficient compression technique can significantly reduce the amount of information needed to store or transmit them.
Special techniques work to reduce the degree of information redundancy, which can be found between single pixels, between lines, or between frames, when ascene is stationary or slighty moving. In this paper,H.263 technique has been adopted. The structure of this technique and characteristics has been studied. Moreover, factors that limit the efficiency of this technique has been identified throught implementing and analyzing the well_known motion search techniques
2D_Logarthmic search, conjugate search (one time search) . In this paper, two new techniques have been developed, threshold quarter_pixel and coddeven motion search to enhance H.263 technique efficiency. The first technique increases the image smoothness of video frames. The second decreases the elapsed time of video compression(encoding delay time)