Determining points of disturbance

摘要

A method and system are provided for determining points of disturbances in a fibrous planar structure. The planar structure is conveyed past a receiver having an array of photodiodes. The photodiodes determine the brightness of the planar structure and compares the received brightness value to threshold values. Brightness values in excess of a predetermined threshold value are deemed to be disturbances in the fibrous planar surface.