Calibrating imaging devices
First Claim
Patent Images
1. A method for calibrating an imaging device to a reference coordinate system, the method comprising:
- locating a plurality of elongated members that detectably reflect an acoustic signal regardless of incidence angle of the signal with respect to the members at known positions with respect to a reference coordinate system;
obtaining a plurality of images taken from different directions with respect to the elongated members and comprising representations of the elongated members; and
calibrating the imaging device to the reference coordinate system based in part on the plurality of images.
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Abstract
Methods and apparatus for calibrating images and imaging devices to common coordinate systems utilize, in some embodiments, rods that detectably reflect an acoustic signal regardless of the incidence angle of the signal with respect to the rods. Typically, the rods are disposed within a “phantom” at known positions with respect to a room coordinate system. Images of the cylindrical rods may be obtained from different directions, allowing the imaging device to be calibrated to the room coordinate system.
91 Citations
55 Claims
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1. A method for calibrating an imaging device to a reference coordinate system, the method comprising:
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locating a plurality of elongated members that detectably reflect an acoustic signal regardless of incidence angle of the signal with respect to the members at known positions with respect to a reference coordinate system;
obtaining a plurality of images taken from different directions with respect to the elongated members and comprising representations of the elongated members; and
calibrating the imaging device to the reference coordinate system based in part on the plurality of images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for calibrating an imaging device to a reference coordinate system, the system comprising:
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a register for receiving a plurality of images imaged from a plurality of locations, the images comprising representations of a plurality of elongated members having known positions with respect to a reference coordinate system and that detectably reflect an acoustic signal regardless of incidence angle of the signal with respect to the members; and
a processor, responsive to the images, for calibrating the imaging device to the reference coordinate system. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus for calibrating an imaging device to a reference coordinate system, the apparatus comprising:
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a first housing comprising a plurality of elongated members disposed at fixed positions within the first housing, the fixed positions being registerable to a reference coordinate system, and a second housing displaced upon the first housing, the second housing comprising a plurality of target areas disposed about the second housing for placement of an imaging device such that images taken by the imaging device, when placed at the target areas, comprise representations of the elongated members within the first housing. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for calibrating an imaging device to a reference coordinate system, the method comprising:
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locating, at known positions with respect to a reference coordinate system, one or more objects that diffusely reflect an acoustic signal from an imaging device;
applying an acoustic signal to the objects to obtain a plurality of images thereof based on diffuse reflection of the signal; and
calibrating the imaging device to the reference coordinate system based at least in part on the plurality of images. - View Dependent Claims (47, 48, 49, 50)
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51. An apparatus for obtaining ultrasonic images, the apparatus comprising:
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a probe comprising an elongated handle;
a faceplate attached to the probe and at least partially surrounding the handle; and
a plurality of signal emitters dispersed about the faceplate. - View Dependent Claims (52, 53, 54, 55)
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Specification