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US 11,669,983 B2Granted
Fast determinant of Hessian filtering for image tiepoint candidate area assessment
AssigneeRaytheon Company
InventorJody D. Verret
Life of this patent
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Abstract
A system identifies strong features in conjugate digital images and correlates the conjugate digital images for an identification of candidate tie points using only portions of the conjugate digital images that include the strong features.
Claims9
A process comprising:
- identifying, using a Determinant of Hessian (DOH), features of a first conjugate digital image resulting in first features;
- identifying strong features in the first features resulting in first strong features, the first strong features including a DOH that is greater, in magnitude, than a threshold value;
- projecting image coordinates of only the first strong features in a first image space of the first image to the ground and back up to a second image space of a second image using image-to-ground geometry support data of the first and second images resulting in second features;
- and
- correlating, using the first strong features and the second features, the first and second images resulting in an identification of candidate tie points using only portions of first and second images that include the first strong features and the second features, respectively.
2 more elements
A non-transitory computer-readable medium comprising instructions that when executed by a process execute a process comprising:
- identifying, using a Determinant of Hessian (DOH), features of a first conjugate digital image resulting in first features,
- identifying strong features in the first features resulting in first strong features, the first strong features including a DOH that is greater, in magnitude, than a threshold value;
- projecting image coordinates of only the first strong features in a first image space of the first image to the ground and back up to a second image space of a second image using image-to-ground geometry support data of the first and second images resulting in second features;
- and
- correlating, using the first strong features and the second features, the first and second images resulting in an identification of candidate tie points using only portions of the first and second images that include the first strong features and the second features, respectively.
2 more elements
A system comprising:
- a computer processor;
- and
- a computer memory coupled to the computer processor;
- wherein the computer processor is operable for:
- identifying, using a Determinant of Hessian (DOH), features of a first conjugate digital image resulting in first features;
- identifying strong features in the first features resulting in first strong features, the first strong features including a DOH that is greater, in magnitude, than a threshold value;
- projecting image coordinates of only the first strong features in a first image space of the first image to the ground and back up to a second image space of a second image using image-to-ground geometry support data of the first and second images resulting in second features;
- and
- correlating, using the first strong features and the second features, the first and second images resulting in an identification of candidate tie points using only portions of the first and second images that include the first strong features and the second features, respectively.
6 more elements
Dependencies are inferred from the claim text.