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Authors have proposed C-A (Contrast-Average) graph that expresses the three factors necessary for visibility estimation based on contrast profile method, and that estimation of visibility using C-A graph is possible has been confirmed. In this study, visibility evaluation experiments using circular objects as visual target was conducted as a fundamental study to develop visibility estimation for low-vision people. The findings of the study are listed below. 1) Visibility evaluation experiments using circular objects were conducted and visibility threshold conditions were obtained under a wide range of objects size conditions. 2) Visibility threshold estimation model of circular objects was established from experimental results. 3) The consistency between the established model and the previous study was confirmed.

FUNDAMENTAL STUDY ON VISIBILITY THRESHOLD OF CIRCULAR OBJECTS FOR SIGHTED PEOPLE