Lightness modification method considering visual characteristics of protanopia and deuteranopia
- PDF / 2,745,896 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 53 Downloads / 187 Views
REGULAR PAPER
Lightness modification method considering visual characteristics of protanopia and deuteranopia Meng Meng1 · Go Tanaka1 Received: 16 December 2019 / Accepted: 5 October 2020 © The Optical Society of Japan 2020
Abstract We live in a colorful world, and it is important for us to receive visual information from colors in situations such as when we read a map. However, such important color-based information cannot be accurately received by some people. These people generally have some type of color vision deficiency such as protanopia or deuteranopia. It is important to realize their difficulties in recognizing differences in colors and provide a solution to this problem. We have proposed a lightness modification method that is designed to convey color information to protanopes and deuteranopes. The proposed method modifies the lightness of an input image by considering color differences so that the modified output image presents visual information for protanopes and deuteranopes. The proposed method changes the lightness of an image without changing the hue. Compared with existing hue changing methods, the output image obtained by the proposed method has more natural colors. Compared with existing lightness modification methods, the output image obtained by the proposed method has more contrast. In this paper, improvement points and parameter setting about the proposed method is described in details. We conducted experiments to show features of the proposed method against existing methods. In addition, we also show the limitation of the proposed method in this paper. Keywords Color vision deficiency · Lightness modification · Protanopia · Deuteranopia
1 Introduction Recognizing color is an important way of receiving visual information in our daily life. However, such color-based information is hard to receive correctly for some people. It has been showed that the prevalence of deficiency in European Caucasians is about 8% in men and about 0.4% in women and between 4% and 6.5% in men of Chinese and Japanese ethnicity [1]. These people can perceive a change in lightness and see as clearly as people with normal vision. The problem is that they cannot discriminate certain colors. Among the types of color vision deficiency, red/green color vision deficiency is the most common type. As shown in Fig. 1, people with this type of deficiency have difficulty in distinguishing some colors. Figure 1b and c are simulated * Go Tanaka [email protected]‑cu.ac.jp Meng Meng [email protected]‑cu.ac.jp 1
Graduate School of Science, Nagoya City University, Nagoya 467‑8501, Japan
images of Fig. 1a as observed by people with protanopia (protanopes) and deuteranopia (deuteranopes), respectively. In this paper, simulated images are obtained by using the color vision model proposed by Viénot et al. [2]. The retina of a human eye has three kinds of cones: Long wavelength sensitive cone (L-cone), middle wavelength sensitive cone (M-cone), and short wavelength sensitive cone (S-cone). These cones are sensitive to light
Data Loading...
