一个很棒的基于java的开源GIS系统OpenMap(TM)。-OpenMap is a Java Beans based toolkit for building applications and applets needing geographic information. Using OpenMap components, youcan access data from legacy applications, in-place, in a distributed setting.

实现了物光和参考光双加密的数字全息加密方法,并从理论模拟和实验上分别验证了该方案,其安全性远高于仅加密一束光时的情况.使用双随机相位加密法加密了原始图像,并使用随机相位片编码了参考光. 加密后的图像由 CCD 接收后再使用计算机处 理.在实验上检测了该系统的信噪比和容错性, 并计算得到系统的密钥长度高达6.3×1014 .-Object and reference light to achieve a double-encrypted digital holographic encryp

用matlab实现的26个字母识别。基于BP算法的字母识别其容错性和识别率相对较高，在有噪声的情况下训练其识别出错率也相应增加，许进一步改进。(26 letter recognition implemented with MATLAB.The letter recognition based on BP algorithm has a relatively high fault tolerance and recognition rate, and the error rate of recog