Evaluation of indication performance using contrast sensitivity chart based on novel photometry

Abstract

The purpose of this study is to quantitatively assess a performance indicator that measures such factors as readability or visibility. We used novel photometric equipment: a charge-coupled device sensor that can measure the distribution of luminance. On various types of paper, we printed a specific striped pattern with predetermined spatial frequency and brightness contrast, and then measured the luminance distribution. We parameterized the luminance distribution and also conducted a subjective assessment to determine the performance. We assessed the visibility quantitatively using multiple regression analysis on the parameters obtained from the photometric sensor. We determined that performance indicators, such as visibility, for printing paper can be assessed by measuring three parameters: spatial frequency, contrast of a striped pattern, and luminance of the background.