初期視覚系に学んだ色恒常性を持つイメージセンサシステム

抄録

Color constancy is an important feature for robotic vision because changing illumination in the natural condition can change the apparent color of objects. In this study, we developed a sensor system with color constancy that consists of a CMOS image-sensor, a field-programmable gate array (FPGA), and a personal computer (PC). The system achieves color constancy by a method that mimics the function of the early vision: Logarithmic transformation from light intensity into an output signal and subtraction of spatial low-pass filtered images of double-opponent color. The PC computes the color information using the images processed by the FPGA. The system was tested by presenting Mondrian under varying color of illumination. As a result, the system output color information that is insusceptible to the color of the illumination.