In this paper

a microcomputer image processing system using a PCVISIONplus Frame Grabber is built

and the principle for writing the programs is explained. Because it takes much time to exchange the data with hard disk

so an algorithm based on the properties of DFT is described in order to resolve this problem. The FFT and the image frequency domain processing can be carried out in the conventional memory of a microcomputer using the algorithm without exchanging the data with hard disk. The speed of the image processing was speeded up. A lot of X-radiology have been processed with the algorithm in the microcomputer image processing system. The result shows that the proposed algorithm is efficient and fast.