1. 用imoise()函数给一幅数字图像加入’salt & pepper’和’Gaussian’噪声2）用3x3,5x5邻域平均平滑对图像进行处理3）用3x3,5x5中值滤波对图像进行处理，



2. 对一幅数字图像采用理想低通、Butterworth低通 、Gaussian低通滤波器进行平滑；对一幅数字图像采用理想高通、Butterworth高通 、Gaussian高通滤波器进行平滑。-1. With imoise () function to a digital image by adding ' salt &　pepper'　and ' Gaussian'　noise 2) 3x3, 5x5 neighborhood average smoothing of the image processing 3) 3x3, 5x5 median filter for image processing , 2. on a digital image with an ideal low-pass, Butterworth low-pass, Gaussian smoothing low pass filter　on a digital image using the ideal high-pass, Butterworth high-pass, Gaussian smoothing high-pass filter.