7.4: Machine Vision Passive Touch Technology for Interactive Displays

A novel machine vision touch screen overlay for flat panel, curved, or projected displays has been developed. The touch screen uses CMOS cameras in the corners of the overlay to recognize the presence of a pointer object. The CMOS cameras are configured to produce an image that is 640 columns by 20 rows. With this configuration, the overlay can determine when and where a hover or touch contact has been initiated.