To clear up any confusion that may be arising regarding PSE testing and Vidchecker:


  • The guidelines for testing whether a video contains scenes that may trigger an epileptic fit in sensitive individuals are defined by ITU and Ofcom in ITU BT.1702-1.
  • ‘Harding’ is a trademark of Cambridge Research Ltd, and was one of the first companies to develop a detection algorithm following these guidelines. Because of their early adoption, ‘Harding’ has become synonymous with PSE testing, in the same vain as ‘Hoover’, for example. However, it is important to note that they are a manufacturer, and not the standards body.
  • Telestream Vidchecker also contains a PSE checking algorithm that follows these guidelines. This was updated in Vidchecker v8.0 to comply with the latest revision of the guidelines.
  • The Digital Production Partnership (DPP) maintains a list of approved PSE testing devices, based on their own, in house qualification/approval testing. Both Vidchecker and Harding are present on this list (along with others), as they both follow the guidelines set out by the ITU/Ofcom.
  • Because Vidchecker and Harding have grown from different codebases, there will always be some differences – occasionally, some ‘edge case’ files may pass one and not the other, for instance. However, it is important to remember that both results are valid, and will be accepted by any DPP member broadcaster.
  • In summary, Vidchecker is an approved PSE testing device, that follows the specified guidelines and is ‘approved’ by the DPP, and is regularly maintained so as to remain compliant.
  • The PSE testing capability is included with the base model of Vidchecker and Vidchecker-Post. We also have a patented PSE correction algorithm, as an additional option.