Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Xiongwei Yan0
Xueli Wang0
Makoto Gohno0
Wei Ding0
Date of Patent
February 12, 2008
Patent Application Number
10981916
Date Filed
November 4, 2004
Patent Primary Examiner
Patent abstract
A method of measuring a modulation transfer function (MTF) includes detecting the center of a line spread function (LSF) image in order to calculate an MTF. For this purpose, an enlarged image of a portion of an image containing the LSF image is created, and binary-coded based on a threshold. A morphological operation is performed on the binary-coded image. Coordinates representing points that define the contour of the resultant image are sampled, and used to work out coordinates representing the center of a circle through Hough transform. The coordinates representing the center are transformed into coordinates representing a point in an original image.
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