Image comparison system
First Claim
Patent Images
1. An image comparison system comprising:
- means for forming a composite image composed of a reference image and a test image;
means for generating a two-dimensional image spectrum from said composite image;
means for whitening said two-dimensional image spectrum by setting the magnitude of every point of the two-dimensional image spectrum to a uniform level;
means, responsive to said means for whitening, for constructing the phase-only image of said composite image; and
means for detecting a value of the phase-only image exceeding a predetermined threshold representative of the location of a difference between the said reference and test images.
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Abstract
Image comparison is accomplished by forming a composite image composed of a reference image and a test image. A two-dimensional image spectrum is generated from the composite image and then is whitened by setting the magnitude of every point of the two-dimensional image spectrum to a uniform level. A phase-only image of the composite image is then constructed, and values of the phase-only image exceeding a predetermined threshold are detected as an indication of the location of a difference between the reference and test images.
39 Citations
16 Claims
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1. An image comparison system comprising:
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means for forming a composite image composed of a reference image and a test image; means for generating a two-dimensional image spectrum from said composite image; means for whitening said two-dimensional image spectrum by setting the magnitude of every point of the two-dimensional image spectrum to a uniform level; means, responsive to said means for whitening, for constructing the phase-only image of said composite image; and means for detecting a value of the phase-only image exceeding a predetermined threshold representative of the location of a difference between the said reference and test images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An image comparison method comprising:
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forming a composite image composed of a reference image and a test image; generating a two-dimensional image spectrum from said composite image; whitening said two-dimensional image spectrum by setting the magnitude of every point of the two-dimensional image spectrum to a uniform level; constructing the phase-only image of the composite image; and detecting a value of the phase-only image exceeding a predetermined threshold representative of the location of a difference between said reference and test images.
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Specification