Читать книгу Multimedia Security, Volume 1 - William Puech - Страница 17

As technologies evolve over time, detection tools must also adapt. Particularly during the transition from film photography to digital images, the authentication methods that were mainly based on semantic analysis of the scene (visual analysis of defects, consistency of shadows and lighting, vanishing points) have been completed through structural and statistical analyses.

To date, available commercial tools are not helpful to the authentication of an image. Most of the time, experts need to design their own tools. This raises the concern of deciding on what ground results from such tools should be accepted as evidence in court. In order to compensate for this lack of objective and precise tools, the police recruits trainees, who participate in national projects (DEFALS challenge funded by the DGA and the French National Research Agency) or international projects (H2020 projects of the European Commission). The objective is to involve university researchers as well as industrialists and practitioners (forensic experts). In addition, experts develop good practice guides such as the “Best Image Authentication Practice Manual” within the framework of the ENFSI² to standardize and formalize analysis methodologies.

Digital images are an essential medium of communication in today’s world. People need to be able to trust this method of communication. Therefore, it is essential that news agencies, governments and law enforcement maintain and preserve trust in this essential technology.