Image Restoration for Security Cameras with Dirty Lens under Oblique Illumination

摘要

An approach for restoring the images of a suspected person taken by a security camera with dirty lens is proposed. In the approach, the peculiar facts concerning the security camera system that all the things in the image except the suspected person itself are usually preserved and that can be used for investigations are to be used as fully as possible. As the first trial for realizing the proposed approach, a method of restoring an image of a person's face taken by a camera with dirty lens under strong oblique illumination is proposed and its practical application is demonstrated experimentally. The importance of pursuing the proposed approach is discussed from the viewpoints of not only the novelty in image processing technology but also the viewpoints of the efficiency in criminal investigation and social security.