matlab图像处理：用矩阵做出二维图像，并转化为灰度图像，经过二维傅里叶变换得到复振幅的振幅值和相位值，并作归一化，将其放置在不同矩形孔位置，得到此图像的计算全息图。-matlab image processing: to make a two-dimensional image matrix, and converted to a grayscale image, after the two-dimensional Fourier transform amplitude and phase values of the complex amplitudes, and to make normalization, placing it in different positions rectangular hole to give the image of CGH.