图像阵列在空域中分析运算量很大，计算上费时、费力，采用图像变换，将空域的图像在频域中表示，使对图像各种处理变得简单。-Computational analysis of large image array to calculate the time-consuming, laborious, using image transformation, the spatial frequency domain representation of the image, so that a variety of image processing becomes simple in airspace.