The HardingFPA Flash and Pattern Analyser is a software solution that is used to analyse video content for flashing and stationary patterns which may cause harm to those who suffer from photosensitive epilepsy. It is an implementation of the guidelines set by Ofcom in the UK. It is available in both tape-based and file-based versions, allowing video streams from SDI, Composite, Component, HDMI, and files to all be analysed, in resolutions up to 1080i. Versions for both Microsoft Windows and Apple Mac OS X are available.
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Photosensitive epilepsy affects approximately one in four thousand people and is a form of epilepsy in which seizures are triggered by visual stimuli that form patterns in time or space, such as flashing lights, bold regular patterns, or regular moving patterns. In 1993, an advert for 'Pot Noodles' induced seizures in 3 people, leading to the ITC introducing these guidelines. Similarly, in Japan during 1997, an episode of the children's cartoon 'Pokémon', Dennō Senshi Porygon triggered over 650 admissions to hospital leading to the episode being banned from television worldwide. More recently, 18 viewers "reported ill effects" while watching a promotional film for the London 2012 Olympics.[1]
The algorithms behind the Harding test itself were developed by Cambridge Research Systems Ltd. and are based on research by Professor Graham Harding.[2] All HardingFPA products implement the same guidelines.
The software is currently used by many television stations in the UK to check for compliance with these guidelines. If a programme fails, it usually means re-editing the offending scenes. Normally this can be rectified by reducing the number of flashes in the scene and/or reducing the intensity of colours (most notably saturated red). After re-editing the problem areas, the entire programme has to be re-tested in order to obtain a HardingFPA certificate.
In 2010, HardingTest.com was launched to provide users with a way of testing video remotely, without the need to have an in-house HardingFPA machine. This provided a much-needed service for freelance editors and smaller production companies who previously had to export their movie to video tape to send to a larger post-production facility for testing, all of which increased time and expense. This service means users can upload a digital video file and have it tested and results returned within minutes rather than hours.
Harding GFA and Harding PF Photosensitive epilesy and image safety. Applied Ergonomics 41 (2010) 504-508