Browse Prior Art Database

ADJUSTABLE EDGE ENHANCEMENT USING A LIBRARY OF FILTERS

IP.com Disclosure Number: IPCOM000027231D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 130K

Publishing Venue

Xerox Disclosure Journal

Abstract

Current system reprographic products, such as the DocuTech Printing System, permit operators to select a single edge enhancement filter at a user interface for allowing the operator to obtain visually accentuated edges which are more pleasing to the eye. In one example, the edge enhancement filter comprises a mask of the high frequency pass form. In some instances, however, a filter of this type may generate displeasing results by accentuating noise in the image. This may occur as a result of the one enhancement filter failing to boost the frequencies necessary to reproduce the pleasing images desired. It would be desirable to provide a technique in which an operator can choose from a range of enhancement filters to optimize image reproduction.

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XEROX DISCLOSURE JOURNAL

ADJUSTABLE EDGE ENHANCEMENT USING A LIBRARY OF FILTERS David C. Robinson

Proposed Classification
U.S. Cl. 358/463 Int. C1. H04n 1/38

Current system reprographic products, such as the DocuTech Printing System, permit operators to select a single edge enhancement filter at a user interface for allowing the operator to obtain visually accentuated edges which are more pleasing to the eye. In one example, the edge enhancement filter comprises a mask of the high frequency pass form. In some instances, however, a filter of this type may generate displeasing results by accentuating noise in the image. This may occur as a result of the one enhancement filter failing to boost the frequencies necessary to reproduce the pleasing images desired. It would be desirable to provide a technique in which an operator can choose from a range of enhancement filters to optimize image reproduction.

The present disclosure is intended to provide operators with a means to apply a range of edge enhancement filters. The provided filters would range from a filter that accentuates edges aggressively (i.e., a higher frequency band pass type) to a filter that accentuates edges less aggressively (a lower frequency band pass type). The DocuTech Printing System permits adjustment of "image quality" on its attendant user interface. When entering image quality, the operator, with the present invention, would select or deselect a default edge enhancement filter referred to as "Sharpness On." Optionally, the operator would select an edge enhancement filter arrangement known as "Special Sharpness" which would enable the operator to choose a stored edge enhancement filter from a library or directory of pre-defined edge enhancement filters. The initial setting of Special Sharpness would be a default edge enhancement filter known as Sharpness On. The operator would be able to make a selection of Sharpness On to obtain an image which would be sharper than the image obtained with the default edge enhancement filter

XEROX DISCLOSURE JOURNAL Vol. 20 No. 5 SeptembedOctober 1995 471

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ADJUSTABLE EDGE ENHANCEMENT USING A LIBRARY OF...