PROBLEM TO BE SOLVED: To provide a low visibility evaluating method and a low visibility evaluating system for improving reliability of evaluation without complicating the system.;SOLUTION: The low visibility evaluating method comprises: a step (S1000) for acquiring a digital image by processing an input image taken by a camera, a step (S1100) for transforming the acquired digital image to spatial frequency by FFT processing, a step (S1200) for applying a band pass filter of the frequency range having excellent human contrast sensitivity, a step (S1300) for determining the visibility based on a predefined criterion by using frequency distribution after this filter processing (for example, a relation between sum of power spectrum of the frequency range after filter processing and evaluation of low visibility by a subject with the index for evaluation of low visibility), and a step (S1400) for displaying the determination in a predetermined form on a screen or printing out on a paper sheet.;COPYRIGHT: (C)2006,JPO&NCIPI
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