Harding test
The term Harding test is generically understood to mean an automatic test for
document (in the UK) updated in November 2018.The Harding Flash and Pattern Analyser (FPA) is proprietary software 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 the regulator Ofcom in the UK largely based on the findings by Graham Harding, a professor at Aston University. 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 8k. Versions for both Microsoft Windows and Apple macOS are available. There are other manufacturers of similar and different solutions available which are also approved on the DPP Devices list.[3]
Photosensitive epilepsy
The Broadcast Code of Advertising Practice requires that TV ads are tested and pass the 'flash test'. Clearcast, the company responsible for clearing ads for UK commercial broadcasters, is flash testing all ads before clearance.
Testing procedures
The algorithms behind PSE testing look at video frames from second to second and analyse for potentially provocative image sequences. Luminance flashes, red flashes and spatial patterns over prescribed amplitude and frequency limits are then logged. Any such over limit violations give rise to the media being failed. Otherwise the media is passed fit for broadcast and a pass certificate can be automatically generated.
The first PSE test was developed by Cambridge Research Systems Ltd. and are based on research by Graham Harding.[4] All Harding FPA products implement the same guidelines. There are also other approved manufacturers' products which either use the same algorithm in different packages or have independently developed software and algorithms that broadly provide PSE checks to the same specifications.
The PSE testing is currently used by all
 | This section contains content that is written like 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.
References
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