Method and apparatus for detecting the leading and trailing edge

Image analysis – Histogram processing – For setting a threshold

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382 7, 382 22, 382 61, G06K 920

Patent

active

053234731

ABSTRACT:
A method and apparatus for detecting where useful image data about a document exists within a stream of successive scans of image data coming from an imaging camera positioned at a scanning line in an imaging system. A reference member having first, second, and third marks thereon is positioned at the scanning line. Several scans of the reference member provide a reference scan which is retained in the system. When a document reaches the scanning line and is imaged by the imaging camera, a change in the pattern of pixels associated with the reference scan is used to signal the leading edge of a document. After the leading edge is detected, the first mark on the reference member is used to detect from the image data whether or not the document has a folded over portion near the leading and bottom edges of the document. The third mark is used to detect from the image data the location of the top of the document. When the pattern of pixels reverts to the reference scan, it is an indication of the trailing edge of the document. A rapid "roll-off" in a white image from the reference scan is used to detect the bottom edge of the document near a dark side of the document track. The useful image data from the mass of pixel data coming from the imaging camera is detected without using external sensors to detect the leading and trailing edges of the documents, for example.

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