of lighting system for contrasted serious code

A lighting device for increasing the contrast of an image of an engraving (46) provided on a surface (S), said device comprising: - a source of polarized light (44) linearly adapted to produce an illumination measured at 50 mm from said source of polarized light greater than 100 000 lux, and arranged to emit a polarized light at an incident axis (I), and - a first polarizing filter (42) linear oriented along an axis of sight (V), the minimum distance between the axis of incidence and boresight being less than 10 mm and the axis of incidence and boresight forming between them an angle between 45 and 65 ° .