https://scholars.lib.ntu.edu.tw/handle/123456789/154805
標題: | Precompression quality-control algorithm for JPEG 2000 | 作者: | Chang, Yu-Wei Fang, Hung-Chi Cheng, Chih-Chi Chen, Chun-Chia LIANG-GEE CHEN |
關鍵字: | Embedded block coding with optimized truncation; JPEG 2000; Low power; Rate control; Rate distortion optimization | 公開日期: | 2006 | 卷: | 15 | 期: | 11 | 起(迄)頁: | 3279-3293 | 來源出版物: | IEEE Transactions on Image Processing | 摘要: | In this paper, a precompression quality-control algorithm is proposed. It can greatly reduce computational power of the embedded block coding (EBC) and memory requirement to buffer bit streams. By using the propagation property and the randomness property of the EBC algorithm, rate and distortion of coding passes is approximately predicted. Thus, the truncation points are chosen before actual coding by the entropy coder. Therefore, the computational power, which is measured with the number of contexts to be processed, is greatly reduced since most of the computations are skipped. The memory requirement, which is measured with the amount required to buffer bit streams, is also reduced since the skipped contexts do not generate bit streams. Experimental results show that the proposed algorithm reduces the computational power of the EBC by 80% on average at 0.8 bpp compared with the conventional postcompression rate-distortion optimization algorithm. Moreover, the memory requirement is also reduced by 90%. The average PSNR degrades only about 0.1∼0.3 dB, on average. © 2006 IEEE. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/141467 https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750285523&doi=10.1109%2fTIP.2006.882013&partnerID=40&md5=fb3971d0e82aafd511d7e3afd897f71e |
ISSN: | 10577149 | DOI: | 10.1109/TIP.2006.882013 | SDG/關鍵字: | Algorithms; Block codes; Image coding; Image quality; Optimization; Embedded block coding; Postcompression rate-distortion optimization algorithm; Precompression quality-control algorithm; Rate control; Image compression; algorithm; article; computer assisted diagnosis; computer graphics; evaluation; image enhancement; information processing; methodology; quality control; signal processing; Algorithms; Computer Graphics; Data Compression; Image Enhancement; Image Interpretation, Computer-Assisted; Quality Control; Signal Processing, Computer-Assisted |
顯示於: | 電機工程學系 |
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