1. An image processing system for dividing an original image into small regions and performing frequency analysis on each small region, characterized by comprising: an image acquisition part for acquiring the original image partially in sequence to produce the partially acquired image sequentially before the original image is entirely acquired; an image division part for dividing the partially acquired image into pixel lines and sequentially producing the pixel lines; a first frequency analysis part for performing one-dimensional frequency analysis on each pixel line so as to sequentially obtain one-dimensional frequency analysis results; and a second frequency analysis part for collecting the one-dimensional frequency analysis results required for analysis of the small region to obtain a two-dimensional frequency analysis result of the small region without waiting for the original image to be entirely acquired; a frequency analysis process being able to be started in the middle of acquisition of the original image.