The development of a mesopic spectral sensitivity curve based on visual observation , and the question of spectral additivity in the mesopic luminance region PhD thesis extract

The aim of the research was to establish an appropriate detection contrast metric in the mesopic luminance range which solves the problem of non-additivity by taking the influence of the chromatic channels into account. Based on several experiments at 10° and 20° eccentricity, and further theoretical modeling the CHC2 contrast metric was constructed, which takes the influence of the chromatic channel, the viewing angle into account. This results in an accurate detection contrast threshold prediction. In the thesis also the prediction performance of the CHC2 contrast metric was compared with models from the literature – the X, the MOVE and the CIE TC1-58 models –.