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Realization of Image Compression in Video System

Author: LiZhuang
Tutor: TaoHongJiu
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: Image Compression DSP MPEG Loeffler
CLC: TP391.41
Type: Master's thesis
Year: 2005
Downloads: 163
Quote: 1
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Abstract


With the development of the information society , the human hope whenever and wherever they can access information easily and quickly . Video information due to its intuitive , vivid and image characteristics , access to information on human life and work has a very important role . Video transmission by the widespread concern future communications . Compared with a voice , and video information data volume , the wider the transmission band required , which often greatly increase the costs , and even the transmission can not be realized , therefore , under the premise that guarantee a certain communication quality , the amount of data of the compressed video information , thereby compressing the required bandwidth of the transmission channel is a key issue for video transmission . In the current video coding systems , video coding algorithm complexity , large amount of computation , using software methods are generally difficult to achieve real-time performance requirements , therefore , the class system is considered more hardware . DSP chips to large amounts of data in real-time processing of digital technology , this real-time capability of the DSP application areas as digital communications , image processing , multimedia technology does not allow time delay is very ideal . TI Introduces Series TMSDM642 its processing power , highly integrated development tools feature most embedded image compression system . The MPEG system has a lot of relevance in the intra-frame compression section , this article first briefly discusses the MPEG-2 video compression standard features and new technologies . Then details the key algorithms used in the MPEG-2 video intra-frame coding : DCT transform, quantization, run-length encoding and Huffman encoding algorithm extracted by analyzing one of the more time-consuming to make improvements . Loeffler algorithm using the improved one-dimensional DCT fast transform , the MPEG quantization techniques also optimized construct avoids division operation improved intra quantization matrix . Porting to TMSDM642 DSP chip , DSP hardware structure for further optimization , and simulation CCS integrated development environment .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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