A digital imaging-based bar code symbol reading system which comprises: an automatic object presence and range detection subsystem; an image formation and detection subsystem having an area-type image sensing array with a field of view (FOV); a multi-mode LED-based illumination subsystem having LED illumination...http://www.google.com/patents/US7320431?utm_source=gb-gplus-sharePatent US7320431 - Digital imaging-based bar code symbol reading system employing a multi-mode illumination subsystem with far-field and near field led-based illumination arrays
