| 摘要 |
PURPOSE:To correct the discrepancy of person's color sensation caused by a color contrast effect and to evaluate it in the same way as a person by a physical measurement, as well by inputting the data read out of an image memory to a color contrast effect arithmetic circuit, calculating it, and applying its output to an image processing circuit. CONSTITUTION:Image data of a reference color pattern 2 brought to image pickup by an image pickup device 1 in advance is brought to A/D conversion and HLS (hue, lightness, saturation) conversion, and thereafter, stored in an image memory 6. Subsequently, it is brought to image pickup by the image pickup device to be evaluated, and stored in the image memory 6. Next, in a color contrast effect arithmetic circuit 8, with respect to a color obtained by this physical measurement, a contrast color is calculated in order to predict how to be seen in the case a person's visual sense feels an inducing color, and by outputting it to an image processing circuit 7, the evaluation is executed. At the time of obtaining a contrast color, a physical color and an inducting color are treated as vectors on a chromaticity diagram, respectively, and the contrast color is calculated by synthesizing both color vectors. In such a way, the discrepancy of person's color sensation caused by the color contrast effect is corrected, and the same evaluation as a person can be executed by the physical measurement, as well. |
