ボケの視覚による最小認知の限界

概要

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Radiographic infocus has been analyzed and measured experimentally and theoretically. Generally speaking, eyes of human beings are adaptable to average brightness, the degree of which is independent on the absolute value of the average brightness. That is, human being's eye response to brightness is relatively low, while it is high to the various contrasts. The limitation of the human being's eye recognition of infocus is generally considered to be over 0.2〜0.3 mm, but the data has yet to be actually obtained. We measured many edged infocus materials psychologically by means of three subjective evaluation methods. As a result, we were able to confirmed that the infocus limitation exists between 0.1 and 0.2 mm in both the vertical and holizontal phases. The infocuses over 0.16 mm were judged to be infocus, and the ones under 0.16 mm were not.
公益社団法人日本放射線技術学会の論文
1983-07-01