輝度画像を用いた視認性評価法

―LED表示や3次元物体にも適用可能な汎用的視認性評価法―

抄録

Proposed in this paper is a visibility evaluation method applicable for any complicated situation. It is applicable, if a luminance image with a target is obtained, to any kind of targets, namely both luminous and reflective targets, to any shape of targets, to targets with non-uniform luminance, and to targets with any complicated luminous background. This method is based on the multi-channel model of our visual system and uses an orthogonal wavelet transform with symlet 6 as the mother wavelet. The method can generate a Visibility Evaluation Image from a luminance image with a target, based on the contrast sensitivity functions of various average luminances. VEI illustrates the visual edges of any objects in the luminance image. The value indicated in the VEI can be represented by using multiples of the threshold level and by using the subjective visibility levels. The VEI for a person with a specific visual performance can be generated if his/her contrast sensitivity functions are provided.