Development of the imaging system based on mesopic vision

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The purpose of this study is to develop the imaging system for mesopic color appearance reproduction. We used an digital camera as an input device and various displays such as the CRT display and the LCD display and even hardcopies as output devices.Human visual system covers a wide range illuminance range from 10^5lx to 10^<-3>lx. This wide dynamic range is achieved with two kinds of photoreceptors in the retina, rods and cones. There are illuminance levels where both rods and cones are active. We have already measured color appearance of color chips under those illuminance levels. Color appearance in mesopic vision differs from that in photopic or scotopic vision. In the present study, we developed the mesopic color appearance model. We compared the real image under any illuminance and the imaginary image predicted by our model to evaluat the performance of our model.Finally we proposed the method to get cone stimulus values and rod stimulus values from the output of the conventional digital camera. The colorimetric calibration was done using a lot of color test charts. The accuracy of the calibration was less than 3 in color difference ΔE^* . Then, we propose an imaging system that provides color appearance of any natural scene under any illuminance level. We also applied the spatial frequency characteristics of human vision to the mesopic imaging system.