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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