sysy

用于图像压缩，并同时对图像进行加密，减少存储空间(In this project we implemented an Image Compression and Encryption algorithm from the reserach paper "Novel Image Compression-encryption hybrid algorithm based on a key-controlled measurement matrix in compressive sensing" by Nanrun Zhou, Aidi Zhang, Fen Zheng, Lihua Gong.)

1 SIFT 发展历程 SIFT算法由D.G.Lowe 1999年提出，2004年完善总结。后来Y.Ke将其描述子部分用PCA代替直方图的方式，对其进行改进。 2 SIFT 主要思想 SIFT算法是一种提取局部特征的算法，在尺度空间寻找极值点，提取位置，尺度，旋转不变量。 3 SIFT算法的主要特点： a) SIFT特征是图像的局部特征，其对旋转、尺度缩放、亮度变化保持不变性，对视角变化、仿射变换、噪声也保持一定程度的稳定性。 b) 独特性(Distinctiveness)好，信息量丰富，适用于在海量特征数据库中进行快速、准确的匹配[23]。 c) 多量性，即使少数的几个物体也可以产生大量SIFT特征向量。 d) 高速性，经优化的SIFT匹配算法甚至可以达到实时的要求。 e) 可扩展性，可以很方便的与其他形式的特征向量进行联合。 4 SIFT算法步骤： 1） 检测尺度空间极值点 2） 精确定位极值点 3） 为每个关键点指定方向参数 4） 关键点描述子的生成 本包内容为sift算法matlab源码(1 SIFT course of development SIFT algorithm by DGLowe in 1999, the perfect summary of 2004. Later Y.Ke its description of the sub-part of the histogram with PCA instead of its improvement. 2 the SIFT main idea The SIFT algorithm is an algorithm to extract local features in scale space to find the extreme point of the extraction location, scale, rotation invariant. 3 the main features of the SIFT algorithm: a) SIFT feature is the local characteristics of the image, zoom, rotate, scale, brightness change to maintain invariance, the perspective changes, affine transformation, the noise also maintain a certain degree of stability. b) unique (Distinctiveness), informative, and mass characteristics database for fast, accurate matching [23]. c) large amounts, even if a handful of objects can also produce a large number of SIFT feature vectors. d) high-speed and optimized SIFT matching algorithm can even achieve real-time requirements. e) The scalability can be very convenient fe)

Unlike infrastructure based wireless networks, nodes in mobile ad hoc networks (MANETs) will also have to act as intermediate nodes for data routing. These additional transmissions will further drain the power resources of mobile nodes which are anyway likely to be running on limited battery power. This paper proposes a Power-Aware Ad hoc On-demand Distance Vector routing protocol (PAW-AODV) for such power limited applications. This uses the overall power resources of the system more efficiently than the standard AODV protocol by choosing routes based on a power-based cost function. We implement our proposed PAW-AODV protocol by suitably modifying AODV and study it through simulations using QUALNET.

说明：  在matlab中，采用RLS算法的自适用滤波器对信号进行均衡处理的源码。(in Matlab, using RLS algorithm applies the filter right from the signal of a balanced source.)

本程序是雷达恒虚警模块的仿真程序，可用于雷达CFAR检测(This procedure is a radar CFAR module simulation program can be used for radar CFAR detection )

直接序列超宽带信号的功率谱密度，其中包括直接序列超宽带信号的产生以及时域频域波形(Direct-sequence ultra-wideband signal power spectral density, including direct sequence ultra-wideband signal generation and frequency domain waveform)

esprit的matlab仿真程序，tsl算法，生成随信噪比递增的均方差变化图。(the esprit matlab simulation program, the tsl algorithm, to generate change in the mean square error with the SNR increase.)

雷达压缩技术研究 线性调频脉冲压缩时域仿真(Radar pulse compression chirp compression technology research domain simulation )

MAtlab program BPSK modulation performance simulation theoric calculation with Q function

LFM—LFM组合波形信号模糊函数图及模糊度图的仿真。(LFM-LFM combination waveform signal ambiguity function diagram and ambiguity simulation.)