FIELD: image recognition equipment. SUBSTANCE: method involves exposition of security item, which is printed using paint with normalized spectrum for absorption, passing and reflecting light in given bandwidth, reading reflected light by photodetector and comparison scanned image of security item under investigation to reference image of authentic security item. Exposition is performed sequentially in several band-widths within which range said paint has normalized spectrum for absorption, passing and reflecting light. Then integral color image of security item under investigation is generated as halftone scale which differ from scale of other intermediate images but which color is equal to halftone scale of corresponding reference intermediate image of authentic security item within corresponding range of visible light. EFFECT: increased efficiency and validity of checking. 2 cl
