程序

# coding=gbkfrom PIL import Imageimport numpy as np# import scipyimport matplotlib.pyplot as pltdef ImageToMatrix(filename):    # 读取图片    im = Image.open(filename)    # 显示图片#     im.show()      width,height = im.size    im = im.convert("L")     data = im.getdata()    data = np.matrix(data,dtype='float')/255.0    new_data = np.reshape(data,(width,height))    return new_data#     new_im = Image.fromarray(new_data)#     # 显示图片#     new_im.show()def MatrixToImage(data):    data = data*255    new_im = Image.fromarray(data.astype(np.uint8))    return new_im        filename = 'lena.jpg'data = ImageToMatrix(filename)print data new_im = MatrixToImage(data)plt.imshow(data, cmap=plt.cm.gray, interpolation='nearest')new_im.show()new_im.save('lena_1.bmp')

 

原始图片

读取后