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OwnerClay Davidson, Alastair Reed +2inventors
InventorsClay Davidson, Alastair Reed, Lixin Shen, Jeremy Cattone
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Watermark and pattern detection can be improved by compensating for artifacts introduced into an image by a printer and/or scanner through which the image has passed. With the present invention, prior to watermark or pattern detection, the image is filtered or modified to compensate for artifacts introduced by the printer and/or scanner. Some scanners automatically compensate for artifacts introduced by the scanner by using a calibrated tone map. The automatic compensation provides an image from which, a watermark can be easily read. However, generally the user is provided with an interface which can be used to change certain parameters such contrast and intensity. The changes made by the user change the compensation (i.e. the tone map) applied to the image. If the user changes the compensation applied to the image it can affect the ability to read the watermark. The present invention provides a system which reverses any compensation introduced by the user so that the watermark or pattern can be more easily read. In another embodiment the invention takes into consideration that some printers and scanners have transfer functions which differ in the “x” and “y” directions. Thus the compensation introduced by the filter can differ in the “x” and “y” directions. In one embodiment, a scanner introduces aliasing frequencies into an image. Detection is improved by selectively removing certain frequencies. In another embodiment, the filter compensates for fact that the scanner frequency response falls off at higher frequencies.
A process and system for improving watermark detection by compensating for artifacts introduced by the printer and/or scanner through which the image has passed prior to detecting a watermark in said image.
A process or system for improving watermark detection by applying different compensation to an image in the “x” and “y” (that is, the vertical and horizontal) directions to eliminate anomalies introduced by a printer or scanner which differ in the “x” and “y” directions.
In a system that includes a scanner that includes a down loadable tone map, a scanner driver that includes a calibrated tone map for the scanner and user controls which control modification of said calibrated tone map to generate a user adjusted tone map, said scanner generating an image which has been modified by said user controlled tone map,
A method of reading a watermark or pattern from a digital image generated by a scanner from a hard-copy image, said digital image most nearly matching said hard-copy image when the image generated by said scanner is modified in accordance with a calibrated tone map, said method comprising,
A method of controlling operations with data carried in a physical image comprising the steps of:
A method of operating on an image comprising the steps of
A system which includes a scanner which has the ability to apply a tone map to a scanned image, and a data source which calculates a user adjusted tone map by applying to a calibrated tone map user established parameters, said data source having the ability to down load said user adjusted tone map to said scanner, said scanner adapted to applying said user adjusted tone map to said scanned image to generate an adjusted image,
A system for operating on an image comprising
A system for operating on an image comprising
A method of acquiring a digital image from a physical document, scanning said image with a scanner to produce a digital image, said scanner introducing aliasing frequencies into said digital image,
A method of creating a digital image that corresponds to an image on a physical document,
A system which includes a TWAIN compliant scanner which has the ability to apply a tone map to a scanned image, and a TWAIN data source which calculates a user adjusted tone map by applying to a calibrated tone map user established parameters,
Dependencies are inferred from the claim text.