1997 Volume 59 Issue 3 Pages 13-22
Color image processing system was constructed to manage the surface color of agricultural products, and several problems in measuring the surface color was examined. Two problems, that is, the setting of condition of illumination which is also an issue in general image processing, and the difference of the color sensation between the visual sense of human and the sense of camera, were dealt with HSL color space. On the problem of illumination, the influence of the quantity of light and the camera angle were examined, and it was confirmed that hue (H) and saturation (S) were not affected by uneven illumination. By the experiments using ripe bananas and immature tomatoes as samples, it was found that the shade of the surface color during post-ripening appeared on the H, and the shade of the surface color in later ripeness appeared on the S.
