中文说明：
常见噪声及其Matlab实现，包括高斯噪声，瑞利噪声，爱尔兰（伽马）噪声，指数噪声，均匀噪声，脉冲（椒盐）噪声等，利用matlab实现噪声的算法和灰度直方图的表示
English Description：
Common noise and its matlab implementation, including Gaussian noise, Rayleigh noise, Irish (gamma) noise, exponential noise, uniform noise, impulse (salt and pepper) noise, etc., using MATLAB to achieve noise algorithm and gray histogram representation