SECURITY MARKS WITH FLUORESCENT TONERS IN ELECTROGRAPHIC PRINTING
A method for marking electrographic prints with fluorescent toner is introduced. This method allows embedding hidden marks into prints by adding fluorescent toner into image edges without halftoning the fluorescent ink channel. An analysis of edge detection algorithms for creating fluorescent ink channel is conducted. Visibility of hidden marks was tested with expert evaluation method. Capability of generating unique hidden marks for each image in a print run is shown.