An OVD on a 500 euro banknote (above) viewed with angled
illumination and a series of different OVD images on a 5 euro
banknote (top) viewed using sequential, multi-angled illumination.
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Examining OVDs (holograms)
OVDs on security documents commonly exhibit different images
when illuminated at different angles. The VSC 6000 is fitted with 14
white LEDs in horizontal and vertical arrays to provide sequential
illumination at varying angles of incidence. The multiple images
comprising the OVD may be stored and displayed without tilting the
document.
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