Digital image data requires large compression ratio in applications like internet, communication and audio-visual environment. In this thesis, we realize the MPEG-4 codec standard on the ARM9-based platform and improve the execution performance by efficient implementations of the core operations such as Motion Estimation and DCT. In the assembly codes obtained by directly compiling the C codes, there exists a lot of redundant checking which causes a large amount of execution time waste. We rewrite some of the compiled assembly codes to improve the execution efficiency using a variety of techniques such as loop-unrolling and data-type optimization. We also analyze the experimental results using several benchmark video sequences with different modes.
Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0814104-185852 |
Date | 14 August 2004 |
Creators | Lee, Yu-jen |
Contributors | Shen-Fu Hsiao, Ing-Jer Huang, Chua-Chin Wang, Wei-Chih Hsu, Chien-Hsing Wu |
Publisher | NSYSU |
Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
Language | Cholon |
Detected Language | English |
Type | text |
Format | application/pdf |
Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0814104-185852 |
Rights | not_available, Copyright information available at source archive |
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