摘 要 文章以空间监控系统为背景,深入研究了JPEG图像压缩标准的实现方法,并基于FPGA对其进行了实现和优化。文中给出了详细的实现方法和优化过程,测试表明达到了很好的效果。 简单介绍了有损静态图像压缩当前有两种比较流行的标准JPEG和JPEG2000。说明了用JPEG方法压缩的原因。 介绍JPEG基本原理：JPEG对灰度图像的压缩处理过程主要包括:图像分割,离散余弦变换(DCT),量化(Quantization),“Z”形排序(Zigzag Scan),差分脉冲编码调制(Differential Pulse Code Modulation,DPCM)对直流系数(DC),行程长度编码(Run-Length Encoding,RLE)对交流系数(AC),霍夫曼(Huffman)编码等。 JPEG标准的特点是离散余弦变换。 比较详细介绍压缩系统的构成和实现。实现提及步骤， JPEG压缩模块设计和编码模块实现细节。
上传时间： 2013-12-25
上传用户：410805624
Atheros公司AR8121/AR8113无线网卡的Linux驱动，Atheros公司处理器以及无线网卡芯片常用于无线路由器，例如TP-LINK产品。
上传时间： 2013-12-25
上传用户：silenthink
This is a simple algorithm that downloads trading data from yahoo database. It is basically a large scale application of sqq.m which was originally submitted by Michael Boldin, link at acknowledgements. Some of the functionalities of the package: - User defined ticker list. - Function for downloading most recent SP500 composition in ticker list. - Control for bad data (e.g. a certain percentage of prices missing). - Choice of frequency of data (e.g. weekly prices). - Choice of starting and ending data. - Function for saving the whole data in a pre-formatted excel file together with a full reports on missing data.
标签： algorithm downloads basically database
上传时间： 2017-06-03
上传用户：啊飒飒大师的
the second volume for intel processor documentation it continues first volume with more processor acces code and specs
标签： processor volume documentation continues
上传时间： 2017-06-05
上传用户：stewart·
This code proposes genetic algorithm (GA) to optimize the point-to-point trajectory planning for a 3-link robot arm. The objective function for the proposed GA is to minimizing traveling time and space, while not exceeding a maximum pre-defined torque, without collision with any obstacle in the robot workspace.
标签： point-to-point trajectory algorithm proposes
上传时间： 2013-12-21
上传用户：chenxichenyue
一款Java实现的HTTP代理服务器，兼容HTTP/1.1,支持SSL链接。RabbIT可以通过过滤背景图片，降低图片的解析率来加速网络浏览的速度。-new Java HTTP proxy server and is compatible with HTTP/1.1, support SSL link. RabbIT can filter background pictures, pictures of analytic lower rates to accelerate the speed of Web browsers.
上传时间： 2017-06-11
上传用户：hebmuljb
ac3标准文档，杜比数字AC-3（Dolby Digital AC-3）是杜比公司开发的新一代家庭影院多声道数字音频系统。杜比定向逻辑系统是一个模拟系统。它的四个声道是从编码后的两个声道分解出来的，因此难免有分离度不佳、信噪比不高，对环绕声缺乏立体感，并且环绕声的频带窄等缺点。
上传时间： 2017-06-21
上传用户：ywqaxiwang
用JAVA写的简单爬虫，使用HttpURLConnection，需要的可以写入循环，然后用htmlparser解析出link。
标签： JAVA
上传时间： 2017-06-22
上传用户：独孤求源
Text mining tries to solve the crisis of information overload by combining techniques from data mining, machine learning, natural language processing, information retrieval, and knowledge management. In addition to providing an in-depth examination of core text mining and link detection algorithms and operations, this book examines advanced pre-processing techniques, knowledge representation considerations, and visualization approaches. Finally, it explores current real-world, mission-critical applications of text mining and link detection in such varied fields as M&A business intelligence, genomics research and counter-terrorism activities.
标签： information techniques combining overload
上传时间： 2014-01-02
上传用户：Late_Li
药物开发中的基于结构的从头设计代码，能够实现GROW和LINK的从头设计，同时POCKET模块还能对蛋白质的活性位点进行分析
标签： 代码
上传时间： 2014-12-20
上传用户：leehom61
