图像处理作业 用matlab显示直方图 累积分布函数 加高斯噪声 再用平滑降噪 都是自己编的程序-Given the test image "Lenna" 256*256 with 256 gray levels, do the following:



1) Using MATLAB display the test image.



2) Display the intensity histogram of the test image.



3) Using the image histogram and cumulative distribution function, locate the intensity value such that 20　of the output pixels are saturated to 0.



4) Add Gaussian noise(mean 2, variance 4) to the test image and display the noisy image.



5) Apply smoothing and median filtering to the noisy image and display the results.