Method for determining the position of an object from a digital image
First Claim
1. Method for determining a position of an object point in a scene comprising a plurality of object points from a digital image of the scene acquired with an optical system having an image sensor array optically coupled to a lens assembly, the method comprising:
- preliminarily determining predetermined vectors via preliminary calibration, and associating said predetermined vectors with respective pixels of said image sensor array, wherein each predetermined vector represents the direction of a light ray in said scene that falls onto said respective pixel of said image sensor array when passing through said lens assembly, said predetermined vectors accounting for optical distortion through said lens assembly;
storing said predetermined vectors within said optical scene;
acquiring a digital image of a further scene through said optical system using said image sensor array, said image including a plurality of image points corresponding to a plurality of object points from the further scene;
measuring and associating distance information of said object points with said image points that correspond with said object points;
storing and said distance information within said optical system;
determining three dimensional coordinates of said object points, said determining occurring based on said stored predetermined vectors and said stored distance information associated with image points corresponding to said object points.
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Abstract
Method for determining the position of an object point in a scene from a digital image thereof acquired through an optical system is presented. The image comprises a set of image points corresponding to object points and the position of the object points are determined by means of predetermined vectors associated with the image points. The predetermined vector represents the inverted direction of a light ray in the object space that will produce this image point through the optical system comprising all distortion effects of the optical system.
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Citations
9 Claims
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1. Method for determining a position of an object point in a scene comprising a plurality of object points from a digital image of the scene acquired with an optical system having an image sensor array optically coupled to a lens assembly, the method comprising:
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preliminarily determining predetermined vectors via preliminary calibration, and associating said predetermined vectors with respective pixels of said image sensor array, wherein each predetermined vector represents the direction of a light ray in said scene that falls onto said respective pixel of said image sensor array when passing through said lens assembly, said predetermined vectors accounting for optical distortion through said lens assembly; storing said predetermined vectors within said optical scene; acquiring a digital image of a further scene through said optical system using said image sensor array, said image including a plurality of image points corresponding to a plurality of object points from the further scene; measuring and associating distance information of said object points with said image points that correspond with said object points; storing and said distance information within said optical system; determining three dimensional coordinates of said object points, said determining occurring based on said stored predetermined vectors and said stored distance information associated with image points corresponding to said object points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification