Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2003-08-15
2008-09-09
Bella, Matthew C. (Department: 2624)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C358S003260, C358S504000, C348S251000
Reexamination Certificate
active
07424169
ABSTRACT:
An image processing method to reduce streaking on a printed sheet uses a negative feedback system to reduce streaking. The method scans a printed sheet to produce image data. The method further measures gray-levels of the image data and computes a compensation vector from the measured gray-levels as the difference between a nominal tonal-resproduction-curve and local tonal-reproduction-curves. The compensation vector is applied the image data to be printed. The compensation vector emphasizes ranges of frequencies sensitive of the human eye.
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Pending U.S. Appl. No. 09/738,573, filed Dec. 15, 2002, entitled:“Macro Uniformity Correction for X-Y Separable Non-Uniformity”.
Mizes Howard A.
Viassolo Daniel E.
Bella Matthew C.
Chu Randolph
Xerox Corporation
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