fdtd

1.灰度变换：选择一幅对比度不足的图像，对该图像进行灰度变换,增强对比度，显示增强前、后的图像以及它们的灰度直方图。 2.直方图均衡：选择一幅灰度直方图不均匀的图像，对该图像进行直方图均衡处理，显示处理前、后的图像以及它们的灰度直方图。 3.选择一幅边缘较模糊的图像，利用高通滤波器（选择或自己设计）对该图像进行边缘增强，观察增强的效果。 4.选择一幅图像，叠加零均值高斯噪声，分别利用低通滤波器、维纳滤波器和中值滤波器对该有噪图像进行滤波，显示滤波后的图 像，比较各滤波器的滤波效果。 5.选择一幅图像，叠加椒盐噪声，分别利用低通滤波器、中值滤波器对该有噪图像进行滤波，显示滤波后的图像，比较各滤波器的 滤波效果。 (err)

使用迭代式阈值算法来提高图像对比度。可以指定某个色阶作为阈值，所有比阈值亮的像素转换为白色；而所有比阈值暗的像素转换为黑色。 (The use of iterative threshold algorithm to enhance image contrast. You can specify a color scale as the threshold, all pixels lighter than the threshold into white and all pixels darker than the threshold value is converted to black.)

matlab-三维曲面的自动绘制及图形构建(matlab-dimensional surface of automatic drawing and graphics, build)

The Block-Matching and 3D Filtering (BM3D) algorithm is a computationally scalable algorithm based on this novel denoising strategy. It achieves state-of-the-art denoising performance in terms of both peak signal-to-noise ratio and subjective visual quality.

本文给出了OFDM-CDM系统在不同的调制方式及编码方式以及未知干扰环境下的性能，内有完整的源码(the performances of OFDM-CDM system under different modulations and codes)

说明：  使用MATLAB 实现（7 4）汉明码编码 并完成纠错 译码正确 可直接使用(hanning7_4.m)

如何运用matlab中的GUI系统，里面用到了包括pushbutton 和 popumenu。 (How to use the matlab GUI system, which used to include pushbutton and popumenu.)

完整的二维非线性共轭梯度反演源代码，作者是Mackie 和Rodi。(Complete two-dimensional nonlinear conjugate gradient inversion source code, the author is Mackie and Rodi.)

Fminsearch does not admit bound constraints. However simple transformation methods exist to convert a bound constrained problem into an unconstrained problem.

This is approximate entropy and sample entropy article. It will be helpful for motor behavior and rehabilitation study.