Accuracy evaluation of video-based augmented reality enhanced surgical navigation systems
First Claim
1. A method of measuring overlay error in augmented reality systems, comprising:
- providing a test object;
registering the test object;
capturing images of one or more reference points on the test object at various positions within a defined workspace;
extracting positions of reference points on the test object from the captured images;
calculating re-projected positions of the reference points; and
calculating the differences between the extracted and re-projected reference points.
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Abstract
Systems and methods for measuring overlay error in a video-based augmented reality enhanced surgical navigation system are presented. In exemplary embodiments of the present invention the system and method include providing a test object, creating a virtual object which is a computer model of the test object, registering the test object, capturing images of control points on the test object at various positions within an augmented reality system'"'"'s measurement space, and extracting positions of control points on the test object from the captured images, calculating the positions of the control points in virtual image, and calculating the positional difference of positions of corresponding control points between the respective video and virtual images of the test object. The method and system can further assess if the overlay accuracy meets an acceptable standard. In exemplary embodiments of the present invention a method and system are provided to identify the various sources of error in such systems and assess their effects on system accuracy. In exemplary embodiments of the present invention, after the accuracy of an AR system is determined, the AR system may be used as a tool to evaluate the accuracy of other processes in a given application, such as registration error.
176 Citations
26 Claims
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1. A method of measuring overlay error in augmented reality systems, comprising:
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providing a test object;
registering the test object;
capturing images of one or more reference points on the test object at various positions within a defined workspace;
extracting positions of reference points on the test object from the captured images;
calculating re-projected positions of the reference points; and
calculating the differences between the extracted and re-projected reference points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 25)
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11. A method of measuring overlay error in augmented reality systems, comprising:
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providing a real test object;
generating a virtual test object;
registering the real test object to the virtual test object;
capturing images of one or more reference points on the test object and generating virtual images of corresponding points on the virtual test object at various positions within a defined workspace;
extracting positions of reference points on the real test object from the captured images;
extracting corresponding positions of said reference points on the virtual test object from the virtual images; and
calculating the positional differences between the real and virtual reference points. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system for measuring overlay error in an augmented reality system, comprising:
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a test object with one or more defined reference points;
a tracking device;
a data processor;
a camera or imaging device used in the AR system, wherein the test object and camera can each be tracked in a tracking space of the tracking system, and wherein in operation the camera or imaging system generates one or more images of the test object and the data processor generates an equal number of virtual images of a corresponding virtual test object at various positions in a defined workspace and locational differences between corresponding reference points are calculated. - View Dependent Claims (19, 20, 21, 22, 23, 24, 26)
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Specification