Method and apparatus for detecting paper skew in image and document scanning devices
AssigneeHewlett-Packard Company
InventorsRichard G. Sevier, Frank P. Carau, Sr.
Life of this patent
Estimating the term…
Abstract
A method and apparatus for determining the extent of skew present in a document being scanned using only the primary vision transducer. The primary vision transducer is wider than the width of the media to be scanned and logically divided into a central image gathering portion and marginal skew detection and image gathering portions.
Claims10
An optical scanning device for scanning media which comprises:
- a primary vision transducer having a width greater than the width of the media which is logically divided into a center portion being designated to obtain image data from the media and a pair of marginal portions, where each marginal portion is designed to obtain data representing marginal edges of the media;
- and
- data analysis circuitry configured to interrupt operation of the optical scanning device upon detecting of the presence of data in the marginal portions of the transducer.
An optical scanning device for scanning media which comprises:
- a primary vision transducer having a width greater than the width of the media which is logically divided into a center portion being designated to obtain image data from the media and a pair of marginal portions, where each marginal portion is designed to obtain data representing marginal edges of the media as well as image data;
- data analysis circuitry configured to detect and note a first data point representing the location of a leading corner of the media and at least one other point along an edge of the media.
A method of controlling an image scanning device having a primary vision transducer having a width greater than the width of media to be scanned comprising:
- logically dividing the primary image transducer into a center portion and a pair of marginal portions;
- designating the center portion to obtain image data from the media;
- designating the marginal portions to obtain data representing marginal edges of the media;
- and
- interrupting operation of the image scanning device if data is detected in the marginal portions of the transducer.
A method of controlling an image scanning device having a primary vision transducer for scanning media comprising:
- detecting and noting data representing the location of a leading corner of the media and at least one point along an edge of the media;
- using the data to predict the location of a trailing corner of the media;
- and
- terminating a scanning process if the predicted location is outside of a predefined limit for the scanning device.
Dependencies are inferred from the claim text.