Patent ID: 7775436

Claim:
A method of driving a plurality of visible and invisible laser diodes to produce an illumination beam having a dynamically managed ratio of visible to invisible spectral power (VIS/IR) during object illumination and imaging operations associated with digital imaging based code symbol reading operations carried out at a point of sale (POS) station, said method comprising the steps of: (a) at said POS station, supplying a plurality of visible laser and invisible laser diodes with default values of diode drive current so as to illuminate an object with a spectral mixture of illumination during object illumination and imaging operations; (b) at said POS station, capturing one or more digital images of the illuminated object using a digital image detection array, and measuring, in real-time, image contrast quality using a digital image processor so as to generate feedback or control data; and (c) at said POS station, using said feedback or control data to dynamically generate adjusted values of diode drive current for use in driving said plurality of visible and invisible laser diodes and producing an illumination beam having a dynamically managed ratio of visible to invisible spectral power (VIS/IR) required to produce digital images of sufficient image contrast to ensure satisfactory image processing, while minimizing visual brightness to humans, at said POS station during object illumination and imaging operations.