HAND-SUPPORTABLE IMAGING-BASED BAR CODE SYMBOL READER SUPPORTING NARROW-AREA. AND WIDE-AREA MODES OF ILLUMINATION AND IMAGE CAPTURE

摘要

A digital imaging-based code symbol reading device comprising of : an IR-based Object Presence and Range Detection Subsystem[12]; a Multi-Mode Area-type Image Formation and Detection Subsystem [21 and 22]having narrow-area and wide area image capture modes of operation; a Multi-Mode LED-based Illumination Subsystem [14] having narrow-area and wide area illumination modes of operation; an Automatic Light Exposure Measurement and Illumination Control Subsystem[15]; an Image Capturing and Buffering Subsystem[16]; a Multi-Mode Image-Processing Bar Code Symbol Reading Subsystem[17]; an Input/Output Subsystem[18]; a manually-activatable trigger switch[2C]; a System Mode Configuration Parameter Table[70]; and a System Control Subsystem[19] integrated with each of the above-described subsystems. The bar code reading device can be configured and operated in numerous programmable modes of system operation to automatically read 1D and 2D bar code symbologies in a high-speed manner using advanced modes of image processing on captured images.