Motion pictures compression

Pao Yue-kong Library Electronic Theses Database

Motion pictures compression


Author: Chan, Yau-wo Michael
Title: Motion pictures compression
Degree: M.Sc.
Year: 1997
Subject: Video compression
Digital television
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic Engineering
Pages: vi, 84 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: This disseration is an investigation on motion picture compression and communication techniques through the network environment using personal computers. The aims of this dissertation are to locate the problems of the existing system and try to resolve the problems by means of the modification of hardware and software. Moreover, this dissertation will also try to estimate the capability of the existing system and to suggest possible future development, such as further development of the colour image system. In a realtime image communication system, it requires to capture, encode, transmit, receive, decode and display the image. Any one of the above process will affect the overall performance, including the frame rate. The program of predecessor's dissertation encoded and compressed the image in MPEG format and it had tried to communicate by using this format. However, most of the image processes were executed very slowly. The average frame rates for 80x80 motion pictures were 1.6 fps and 0.45 fps for Platinum and 486 DX-33 respectively. In order to resolve these problems, many testing program modules and hardware modules have been developed or modified as part of the present work and these modules have been used to exchange some existing modules for testing their performance. These modules include display program module, capture program module, communication program module, JPEG compression program module, no-compression program module, TMS320C32 emulator hardware module, and hardware module of Erasable Programmable Logic Device (EPLD). In order to meet the target of this dissertation (i.e. realtime image communication with 30 frames per second) step by step, the study has been focused on the compression of image with JPEG format. Series of data have been taken for evaluating the overall system performance on Platinum with a frame size of 80x80 pixels. The file transfer rate of the network is about 410 Kbytes/s. The display rate is 169 fps. The capture rate of mono and colour image are 75.76 fps and 55.56 fps respectively. The frame rates of uncompressed mono and colour image communication are 26.3 fps and 12.77 fps respectively. The frame rate of the JPEG mono image communication is 15.3 fps, while the frame rate of the MPEG mono image communication is 4.58 fps.

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