摘要:@@ Super VGA+MPEG+TV+Video Caputer(COMBO)多媒体四合一卡(型号为MVPCI-C卡)是北京微视电子技术有限责任公司根据目前最新64bit芯片研制开发出来的多功能多媒体视频卡,其性价比卓越,强大的图形引擎,可使视频操作的模块组合变得更加灵活,该卡可应用于家用多媒体环境,商务演示,视频会议,监测系统,图文系统,图文数据库等领域.
摘要:@@ 利用IDL开发的商用遥感软件除了ENVI外还有以下几个软件:rn(1)3-D SAR Ground Station rn此软件是美国Vexel公司用IDL开发的用于SAR(合成孔径雷达)数据地形校正的商业软件.此软件不仅可以对各种SAR数据进行正射校正,而且可以生成3维SAR图象,从而使用户可以获得高质量的可被GIS直接使用的SAR数据.
摘要:This paper deals with the estimation of the theoretical and practical performance efficiency of a subband coding system for still images using memoryless quantizers optimized to entropy and mean-square error constraints. An approach with the concept of rate-distortion theory has allowed to derive a function in special form,which gives the performance gain in terms of signal-to-noise ratio and redundancy reduction. The theoretical upper bounds on entropy coded bit rate reduction were found to be 1.10; 1.51 and 2.10 bits per pixel for M = 4, 7 and 16 subbands, respectively. Some simulation results concerning practical performance are presented and interpreted on test images.%本文讨论了最佳熵和均方差约束无记忆型量化器静止图象子带编码系统中性能效率的理论和实际估算.利用一失真理论概念推导出了一种特殊形式的函数,从而给出了用信噪比和冗余减少量表达的性能改善.在子带数M为4,7和16时,熵编码比特压缩率的理论上限为1.10,1.51和2.10比特.曾在测试图中演示并说明了实际性能的模拟结果.