Dawn Chin-Ing Koh

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We research a mobile imaging system for early diagnosis of melanoma. Different from previous work, we focus on smartphone-captured images, and propose a detection system that runs entirely on the smartphone. Smartphone-captured images taken under loosely-controlled conditions introduce new challenges for melanoma detection, while processing performed on the(More)
Over the past decade, text-based CAPTCHA (TBC) have become popular in preventing adversarial attacks and spam in many websites and applications including emails services, social platforms, web-based market places, and recommendation systems. However, in addition to several problems with TBC, it has become increasingly difficult to solve in recent years, to(More)
We investigate the design of an entire mobile imaging system for early detection of melanoma. Different from previous work, we focus on smartphone-captured visible light images. Our design addresses two major challenges. First, images acquired using a smartphone under loosely-controlled environmental conditions may be subject to various distortions, and(More)
Self-diagnosis applications refer to a type of accessible healthcare systems that help users detect illness at the early stages. Unlike self-monitoring applications, users of self-diagnosis applications are non-patients - people who do not have the explicit awareness of their potential diseases or health problems. It is not clear how to incentivize usage,(More)
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