FlashGuard: Novel Method in Evaluating Differential Characteristics of Visual Stimuli for Deterring Seizure Triggers in Photosensitive Epilepsy

TL;DR

FlashGuard introduces a real-time, computationally efficient method to assess and mitigate potentially seizure-inducing visual stimuli in digital media for individuals with photosensitive epilepsy, improving safety and accessibility.

Contribution

It presents a novel color-based detection and mitigation system for PSE triggers, enhancing existing norms with real-time analysis and perceptually aligned color space techniques.

Findings

Effective reduction of luminance and smoothing of color transitions in real-time

Insights into how intrinsic color properties influence flashing perception in PSE

Recommendations for expanded WCAG guidelines for better PSE protection

Abstract

In the virtual realm, individuals with photosensitive epilepsy (PSE) encounter challenges when using devices, resulting in exposure to unpredictable seizure-causing visual stimuli. The current norm for preventing epileptic flashes in media is to detect asynchronously when a flash will occur in a video, then notifying the user. However, there is a lack of a real-time and computationally efficient solution for dealing with this issue. To address this issue and enhance accessibility for photosensitive viewers, FlashGuard, a novel approach, was devised to assess the rate of change of colors in frames across the user's screen and appropriately mitigate stimuli, based on perceptually aligned color space analysis in the CIELAB color space. The detection system is built on analyzing differences in color, and the mitigation system works by reducing luminance and smoothing color transitions. This study provides novel insight into how intrinsic color properties contribute to perceptual differences in flashing for PSE individuals, calling for the adoption of broadened WCAG guidelines to better account for risk. These insights and implementations pave the way for stronger protections for individuals with PSE from dangerous triggers in digital media, both in policy and in software.