Illumination specially adapted for pattern recognition, e.g. using gratings

Full Title

Arrangements for image or video recognition or understanding (character recognition in images or video G06V30/10) > Image acquisition (document image scanning and transmission H04N1/00; control of digital cameras H04N23/60) > Details of acquisition arrangements; Constructional details thereof > Optical characteristics of the device performing the acquisition or on the illumination arrangements > Illumination specially adapted for pattern recognition, e.g. using gratings