Patent ID: 7965414
Filing Date: 2011-06-21
Classification: H04N

Abstract:
1. A method of detecting image quality defects, comprising: obtaining an electronic source image including electronic source image data; rendering an image based on the electronic source image data; capturing the rendered image, the captured image including electronic rendered image data; registering the source image with the rendered image; storing pixel color defect data related to corresponding pixels in the source image and the rendered image in a pixel color defect data log; and analyzing the pixel color defect data from multiple source image/rendered image pairs to identify image quality defects, wherein the pixel color defect data log includes a pixel confidence value for each pixel that is measure of whether the individual pixel is a good candidate for use in identifying image quality defects, analyzing the pixel color defect data from multiple source image/rendered image pairs to identify image quality defects comprises: assessing pixel difference data using interpolation techniques to detect and/or to correct image quality defects within a predetermined color over a predetermined spatial location, and the interpolation techniques include moving matrix interpolation techniques using where x=[p, q, Δc, Δm, Δy, Δk], where p is a datestamp/timestamp for the pixel and q is a measure of a confidence based on the pixel confidence rating stored for the pixel contained in its respective scan area pixel confidence; Δc, Δm, Δy, Δk are each a source image pixel/rendered image pixel component difference a respective color components of the printing system; ∥•∥ is a vector norm (such as 1-norm, 2-norm, etc.); and α and ε control a smoothness and localization of the interpolation.