The present invention relates to an image processor that is configured to compare a single frame included in the received signal with a preceding processed frame so as to detect changes. The engine is activated by queries for selecting records based on given criteria and comprises means for preconditioning the database supplying a preconditioned encoded table, periodically updated at the same time as the relational database itself, to a machine with vectorial capabilities in order for it to be processed. One of the two radiographic images is produced according to a scout image capturing mode or a stereographic image capturing mode, and the other is produced according to the stereographic image capturing mode.