以離散小波轉換及SPIHT為基礎進行即時NTSC影像壓縮之編碼器
| Autor: | C. H. Liu, 劉洽興 |
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| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 In our daily life, image compression has become more and more important. For example, the video monitor, video conferencing and VCD recorder etc., include the image compression technology. Since the data size of the image is very large, if there is no compression before transmitting or storing, it will waste a lot of communication bandwidth or storage space. In this thesis, FPGA implementation of real-time video compression is described. The raw data are transformed to the multi-band data by Haar discrete wavelets transform. Because we want to get high compress ratio for real-time video, the multi-band data are encoded to series data by listless and multi-part SPIHT. Four methods are used to reduce the number of registers to an acceptable number for FPGA, i.e., the scan order based on tree, encoding DC and AC by different methods, direct eliminating multi-band data instead of refining, pre-encoding high-band and low-band data in different logic. The data processing speed for compressing a 640 x 240 picture can reach 15 frames per second. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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