图像剪切，图像处理的基础操作，只是简单的转换，基于频域的变换。-Image cropping , image processing operation , just a simple conversion , based on the frequency domain of the transform .

图像二值化，图像处理的基础操作，只是简单的转换，基于频域的变换。-The image binarization , image processing operation , just a simple conversion , based on frequency domain transform .