Introduction - If you have any usage issues, please Google them yourself
Respectively of the original image in the frequency domain using the ideal low-pass filter (choose an arbitrary cut-off frequency) and the ideal high-pass filter (choose an arbitrary cut-off frequency) and the ideal high-pass filter, and its use of fast Fourier transform, and output restored the image of the frequency spectrum. Finally, after the high pass filtering and low-pass filtering the summed output, and compares with the original image.