A hand-supportable digital imaging-based bar code symbol reading system comprises: an automatic object presence and range detection subsystem; an image formation and detection subsystem; a multi-mode LED-based illumination subsystem having an LED illumination array; an automatic light exposure measurement...http://www.google.de/patents/US7270272?utm_source=gb-gplus-sharePatent US7270272 - Digital image-based bar code symbol reading system employing a multi-mode image-processing symbol reading subsystem
