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这种方法一方面将像素的灰度值分散，可以分辨图象中比较细节的内容；另一方面，将图 象的灰度变化控制在一定范围之内，抑制了噪声的产生，较大程度上地保留了原始图象的亮度．(This approach on the one hand spread the pixel gray value, the more details you can identify the contents of the image the other hand, the image gray scale control in a certain range, suppress noise generation, a greater degree preserved on the original image brightness.)

clearly , the last watermelon ! :)))))

说明：  应用matlab进行数字信号处理的一些源代码，希望对大家有帮助。(Matlab applications for digital signal processing of the source code, and I hope to be helpful.)

对Lena图像128*128，进行QF=50和QF=40的压缩，然后解压缩，并分别计算压缩图像的PSNR，给出图像压缩后的图像(Lena image of 128* 128,QF=50 and 40 compression, then uncompress, and calculate the PSNR compressed image, after image compression)

simulating center location(simulation)

本源程序提供在AWGN信道下的bpsk调制方式的仿真，并与理论曲线作比较，得到了理想的结果(This source provides bpsk under the AWGN channel modulation of the simulation, and compared with the theoretical curve obtained satisfactory results)

Demons算法是一种基于灰度信息的全自动非刚性配准方法,其配准结果容易受图像之间灰度不一致的影响(Demons algorithm is a kind of automatic non rigid registration method based on gray level information, and the result of registration is easy to be affected by the gray level between images. )

convert directory of images to a movie in Matlab

在无约束最优化方法中，通过选择搜索方向 k d 而得到的方法主要有四种：最 速下降法，Newton法，共轭方向法，Quasi-Newton (拟牛顿法)。 (Study on the algorithm of several nonlinear conjugate gradient method and the analysis of global convergence)

直接序列扩频通信系统误码率的仿真分析PN码同步方法的比较与仿真(Direct Sequence Spread Spectrum Communication System Simulation and Analysis of BER PN Code Synchronization Methods and Simulation)