遵循xDM标准的PGF压缩编码器优化设计.pdfVIP

光学精密工程 VoJ. 16 No.7 第 16 卷第7 期 2008 年 7 月 。ptics and Precision Engineering ju J. 2008 文章编号 1004-924X(2008 )07-1273-06 遵循 xDM 标准的 PGF 压缩编码器优化设计 胡新华1.2 ，邓元勇l ，王先平3 (1.中国科学院国家天文台，北京 100012;2. 中国科学院研究生院，北京 100049; 3. 北京芯系嵌入式系统设计室，北京 100012) 摘要:针对太阳观测中产生的极大数据流量，提出了一个遵循 xDM 标准的渐近式图形文件(PGF) 压缩编码器对太阳观 测图像进行实时压缩以节省存储空间和网络带宽。分析并裁减了在自然图像压缩和压缩速度方面都有很大优势的 PGF 压缩算法z 按 xDM 标准要求的接口设计了一个 PGF 压缩编码器，并针对达芬奇硬件架构的特点在软件设计、C 语言编 程和线性汇编等多个方面进行了优化g 最后，对压缩比、压缩时间和压缩信噪比等性能参数进行了在线实时测试。测试 结果表明，优化后的 PGF 压缩编码器的压缩速度是原有编码器的 18. 7 倍，完全满足太阳望远镜实时图像处理终端的要 求。 关 键 词:渐近式图形文件(PGF);xDM 标准g 编码器;这芬奇技术;图像压缩g 优化 中图分类号:TP751;TN762 文献标识码:A 的‘. , 也 Optimal design of PGF compression encoder based on xDM standard HU Xin-hua I. 2 , DENG Yuan-yongI , WANG Xian-ping3 O. National Astronomical Observatories. Chinese Academy of Sciences , Beijing 100012 , China; 2. Graduate University of Chinese Academy of Science 3. Beijing Xi切nXi Embedded System Design House , Beijing 100012 ,China) Abstract: A Progressive Graphic File(PGF) compression encoder based on xDM standard was presen- ted for the real-time image compression of a solar image. The PGF compression algorithm with advan- tages of natural image compression and compression speed was analyzed and customized. According to the interfaces required by xDM standard , a PGF compression encoder was designed. Aiming at the features of the DaVinci hardware architecture , the PGF compression encoder was optimized on many aspects such as software design , C language program and linear assembly language program. Finally , a real-time online test was carried o