Human sensitivity of color defects inspection

Visual inspection is one of the important quality control functions of production lines. In this area, many automatic visual inspection machines have been introduced and proved their effectiveness. Today, visual inspection is going to be applied to the small and vague color defects inspection. In these cases, the measured color signal values do not correspond to human sensitivity. So, it is very important to evaluate the human sensitivity of color defects. There are three components to describe the color. They are brightness, hue and saturation. These parameters influence the human sensitivity to detect color defects. In this research, to develop the visual inspection system of color defects, human sensitivity changes according to the different color parameters are evaluated and in the color defects inspection machine, color signals are normalized by the evaluated human sensitivities. Through this normalization, the color visual inspection machine has the same ability with human inspectors.