Influence blur off to a small radius on the digital image’s formal parameters
Information system security, in particular, identifying the violation of the integrity of digital images is considered an important task in today’s world of information technologies. When the integrity is violated, the image is often blurred. None of the currently known blur detection methods can detect a blur circle of a radius less than one. Although practically non visible, blurring with such a radius can occur and result in nonreversible changes in the digital image matrix. Methodology of investigation is based on using general approach to the analysis of the state and technology of information systems functioning. Investigation of this paper is aimed at revealing results of post-processing made by blurring of digital images after their falsification. As a result of investigation there were found some peculiar properties, allowing detecting blurring of digital image with a radius less than one, to increase efficiency of the complex information security systems.