SUB-PIXEL ACCURACY AND VALID CORRELATION SIGNAL DETECTION BY FORWARD AND REVERSE CORRELATION
First Claim
1. A method of calculating a correlation peak comprising:
- determining a forward correlation peak from a forward correlation between a first image and a second image;
determining a reverse correlation peak from a reverse correlation between the second image and the first image;
validating the forward correlation peak;
validating the reverse correlation peak; and
combining the forward correlation peak and the reverse correlation peak to provide a combined correlation peak.
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Accused Products
Abstract
Improved correlation techniques employ data from forward (template-to-reference) and reverse (reference-to-template) correlation to identify valid correlation peaks, enforce symmetry in correlation peaks, and/or combine forward and reverse correlation data. In embodiments, these techniques eliminate or reduce rms noise in a recovered signal peak location by enforcing correlation peak symmetry. The forward and reverse correlation methods described herein may be used for validation of correlation peaks, detection of outlier data points and improved interpolation, such as for higher accuracy localization of a peak center with sub-pixel resolution.
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Citations
12 Claims
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1. A method of calculating a correlation peak comprising:
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determining a forward correlation peak from a forward correlation between a first image and a second image; determining a reverse correlation peak from a reverse correlation between the second image and the first image; validating the forward correlation peak; validating the reverse correlation peak; and combining the forward correlation peak and the reverse correlation peak to provide a combined correlation peak. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising
first computing means for determining a forward correlation peak from a forward correlation between a first image and a second image; -
second computing means for determining a reverse correlation peak from a reverse correlation between the second image and the first image; third computing means for validating the forward correlation peak; and fourth computing means for combining the forward correlation peak and the reverse correlation peak to provide a combined correlation peak.
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7. A method of enforcing correlation peak symmetry between a pair of images in an image processing algorithm, comprising:
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determining a forward correlation peak from a forward correlation between a first image and a second image; determining a reverse correlation peak from a reverse correlation between the second image and the first image; combining the first correlation peak and the second correlation peak to provide a combined correlation peak; and enforcing symmetry in the combined correlation peak. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification