In recent years, with the development of media equipment, color images have been extensively applied in various domains. However, people with dichromatic or anomalous trichromatic vision have difficulty discriminating the colors that common trichromatic vision would distinguish. To improve image visibility for dichromats, a lightness modification method considering the chromaticity loss was proposed in this study. First, the chromaticity loss was defined for dichromats. Subsequently, an objective function including the chromaticity loss was constructed. To focus on color pairs with a large chromaticity loss, a weight was introduced into the objective function. The objective function was then minimized to obtain output images. Finally, the effectiveness of the proposed method was verified through experiments, which indicated that the proposed method could maintain naturalness for normal trichromats and improve recognition for dichromats.

近年来，随着媒体设备的发展，彩色图像在各个领域得到了广泛的应用。然而，具有二色视觉或异常三色视觉的人很难辨别普通三色视觉能够区分的颜色。为了提高二色视者的图像可见度，本研究提出了一种考虑色度损失的亮度修改方法。首先，定义二色视者的色度损失。随后，构建了包括色度损失的目标函数。为了关注色度损失较大的颜色对，在目标函数中引入了权重。然后最小化目标函数以获得输出图像。最后，通过实验验证了该方法的有效性，表明该方法能够保持正常三色视者的自然性，并提高对二色视者的识别能力。