Method and system for improved sensing with robustness to banding for rendering devices
AssigneeXerox Corporation
InventorsDan René Rasmussen, R. Victor Klassen, Wencheng Wu
Life of this patent
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Abstract
For a selected class of functions, which describe most typical banding variations, the average response can be found by sampling at only 2Nth locations, where N is the number of different frequencies of significant banding. This approach makes use of the fact that in most applications the banding frequencies of a given printer system, are known in advance, even if the amplitudes of the banding are not known. Each sample point requires a very small test area or pattern, significantly reducing the overall size of the required test areas.
Claims16
A method for determining an average response of an image rendering device, the device producing bands in images with at least one banding frequency, the method comprising:
- calculating a number of sampling sites as a function of a number of the at least one banding frequency of the image rendering device, wherein the number of sampling sites is 2N where N is the number of the at least one banding frequency of the image rendering device;
- determining locations of the sampling sites based on at least one banding period of the bands;
- printing test patterns at the sampling sites;
- analyzing the test patterns;
- determining the average response of the image rendering device based on the analyzing;
- and,
- providing information to the image rendering device based on the average response.
A system where determining an average response of an image rendering device producing bands in images with at least one banding frequency, the system comprising:
- a printing device operative to print test patterns;
- a measuring device operative to analyze the test patterns;
- and,
- a processor operative to calculate a number of sampling sites for the test patterns wherein the number of sampling sites is 2N where N is the number of the at least one banding frequency of the image rendering device, determine locations of the sampling sites based on at least one banding period, determine an average response of the image rendering device based on the analyzed test patterns and provide information based on the average response.
Dependencies are inferred from the claim text.