Mobile colored overlays for people with visual stress

Abstract

A colored overlay has been used as an assistive device for people with visual stress. Recently, a kind of mobile colored overlays has been developed; however, it can't be applied to all contents of its environment. In this paper, I implemented a mobile overlay application based on the Android operating system and it can be applied to not only all contents in the system but also external contents such as book using camera mode. To achieve this, I measured film overlay colors at transmit mode and reflect mode by using spectrum colorimeter and estimated and implemented color information to apply to virtual overlays. Chromaticity measured in reflect mode was heavier than the one measured in transmit mode. I found I needed to use chromaticity measured in reflect mode in order to keep the film's overlay effect in virtual colored overlay, which was applied to printed paper. The test results showed that it had the same effect as when existing film overlay was used on white paper, with the exception of color effect on the white screen of mobile devices. © 2014 SERSC.