Image processing
AssigneeBAE SYSTEMS plc
InventorsNicholas Laurence Carter, Yoann Paul Georges Thueux
Life of this patent
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Abstract
A method of selecting a homography model from point correspondences of an associated image pair; a method of filtering point correspondences from a pair of associated images; a method of calculating a homography transformation; and a method of image differencing; including implementing one or more sampling constraints, e.g. partition zones and an exclusion zone, that provide a more even spread of point selection over the image, and/or that provide for selected points to be spread further apart, than would be the case if the one or more sampling constraints were not implemented. Repeated selections of combinations of points may be selected in a deterministic manner, and the deterministic manner may be tailored to an escape condition.
Claims15
A method of selecting a homography model from point correspondences from a pair of associated images, the method comprising:
- implementing one or more sampling constraints that provide a more even spread of point selection over an image, and/or that provide for selected points to be spread further apart, than would be the case if the one or more sampling constraints were not implemented;
- and
- performing sample consensus constrained by the sampling constraint or constraints to select the homography model.
A method of image differencing, comprising:
- image differencing between two images which have been warped using point correspondences filtered by a homography model selected using a combination selection process comprising one or more sampling constraints that provide a more even spread of point selection over the image, and/or that provide for selected points to be spread further apart, than would be the case if the one or more sampling constraints were not implemented.
A method of selecting a homography model from point correspondences from a pair of associated images;
- the method comprising:
- repeatedly selecting combinations of points for model testing in a deterministic manner such that no combination of points is selected twice.
A storage medium storing processor-implementable instructions for controlling one or more processors to carry out a method of selecting a homography model from point correspondences from a pair of associated images, the method comprising:
- implementing one or more sampling constraints that provide a more even spread of point selection over an image, and/or that provide for selected points to be spread further apart, than would be the case if the one or more sampling constraints were not implemented;
- and
- performing sample consensus constrained by the sampling constraint or constraints to select the homography model.
Dependencies are inferred from the claim text.