A hand-supportable digital imaging-based bar code symbol reading device comprises: an automatic object presence and range detection subsystem; an area-type image formation and detection subsystem having a CMOS area-type image detection array, and narrow-area and wide area image capture modes of operation;...http://www.google.co.uk/patents/US20050103851?utm_source=gb-gplus-sharePatent US20050103851 - Hand-supportable imaging-based bar code symbol reader employing a CMOS-type image sensor using global exposure techniques
