Charmaine Louie, Joshua Brown, James Mardell, Mark Witkowski
12th Cambridge Workshop on Universal Access and Assistive Technology (CWUAAT) (2025)
Colour Vision Deficiency (CVD) also known as colour blindness affects many people in their day-to-day lives, reducing their ability to distinguish certain colours. The pre-dominant types of CVD are red-green CVD and blue-yellow CVD. We introduce colour spectrum shifting to aid CVD users, enhancing their colour differentiation by making better use of the existing range of colours they can perceive. Spectrum shifting is demonstrated within ASTER, an iOS phone app applying real-time image processing to the live camera feed. Using ASTER, users with CVD can now correctly identify all the numbers in a stand-ardised Ishihara test and they also report it effective in everyday use.