OPTOELECTRONIC SYSTEM FOR RELIABLE DETECTION OF DOCUMENT PRESENCE

This paper presents the implementation of optoelectronic subsystem for reliable detection of document position in the system for scanning when strong light background and reflection are present. It contains analysis of commonly applied position sensing technology, descriptions of the subsystem concept, main functional blocks and control interface. Special attention has been paid to the optimization of detection parameters with accent on the reliability of detection. The subsystem for detection of document presence has been implemented and successfully integrated in the system for document scanning. This subsystem can be used for reliable detection of the presence of many other objects when it is required that it should be placed in sealed enclosure along with other parts of scanning system, separated by glass window from the object.