Method for determining an optimum gain response in a spatial...

Details Method for determining an optimum gain response in a spatial... Method for determining an optimum gain response in a spatial...

2007-05-29

2007-05-29

Patel, Kanjibhai (Department: 2624)

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C382S263000, C382S264000, C358S003260

Reexamination Certificate

active

10360030

ABSTRACT:
A method for determining an optimum gain response in a spatial frequency correction for a projection system comprises the steps of setting a code value (100) to a first code value; projecting a flat field image at the code value; capturing the flat field image (540) with a camera; creating a defect map (70) of defects in the flat field image; applying the defect map to the flat field image to form a corrected image; setting a gain table (80) to a first gain for the corrected image; applying the gain table to the corrected image; registering the corrected image; filtering the registered image; measuring the filtered image for a standard deviation (570); determining whether all gains for producing an under corrected image (60) and an over corrected image have been exhausted for the code value; if all gains have not been exhausted for the code value, set the gain table to the first gain plus n and go to the step of applying the gain table to the corrected image, if all gains have been exhausted go to determining an optimum gain for the code value.

REFERENCES:
patent: 5113258 (1992-05-01), Roth
patent: 5652661 (1997-07-01), Gallipeau et al.
patent: 5701185 (1997-12-01), Reiss et al.
patent: 5745156 (1998-04-01), Federico et al.
patent: 6618185 (2003-09-01), Sandstrom
patent: 6795572 (2004-09-01), Matsuno

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