In order to achieve best license plate recognition rate, it is required a high-resolution, contrasted and optimum illumination image of the license plate region. Some of the variables affecting to the illumination of the license plate are:

  • Global Variables: overall scene illumination, meteorological conditions, day-night time, etc.

  • Local Variables: reflectivity of plate, physical conditions of plate (dirty, broken, ...), local shadows on the plate, etc.

multi-exposition technique allows overcoming these global and local illumination variables affecting the license plate region. Imagsa’s ANPR cameras implement an innovative and auto-adaptive multi exposition technique, achieving a good illumination of the plate image regardless of local and global conditions. Thus, a high recognition rate is always achieved.

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