Scaled differential image compression for videoconferencing applications.
Item
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Title
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Scaled differential image compression for videoconferencing applications.
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Identifier
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AAI9510628
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identifier
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9510628
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Creator
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Avcilar, Mustafa Tamer.
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Contributor
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Adviser: Ron Ashany
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Date
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1994
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Language
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English
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Publisher
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City University of New York.
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Subject
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Computer Science
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Abstract
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There are many number of problems facing the compression of motion video. Even the most state of the art compression methods are not capable of handling motion video without sacrificing either one of the "compression speed" vs. "image quality" options. In a process where it takes up to 30 frames of images to make 1 second of motion video, the process of coding images without significant delay is critical and often very difficult to overcome. Systems that use a fixed bandwidth for transmission of compressed video must also use methods that can dynamically adjust the compression ratio to maintain a constant rate of data transmission costing only some degradation of image quality.;We present a method called "Scaled Differential Image Compression" (SDIC) for Videoconferencing Applications and propose an effective means of gaining high compression ratios and real-time compression for the transmission of motion video. SDIC takes advantage of the similarities between consecutive image frames and provides a means to only store the pixels that have changed their value since the previous frame. A new frame of an image gets compared to the previous one, creating a new image vector containing only those pixels that have changed. SDIC achieves compression by taking advantage of both spacial and temporal redundancies in images. Our algorithm also allows the definition of a "scale of change" which can dynamically adjust to achieve varying compression ratios to keep the information flow at a constant rate making it an ideal algorithm for use in videoconferencing applications that uses fixed capacity ISDN lines as the transmission medium.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
