LOCALIZING A SURVEY INSTRUMENT IN RELATION TO A GROUND MARK
First Claim
1. A method for localizing, in relation to a mark located at a ground level, a surveying instrument having a housing including at least one camera, said method comprising:
- aligning a vertical rotational axis of the surveying instrument with said mark using a pointing device;
capturing an image of the ground below the housing with said at least one camera arranged in a camera position and orientation, said camera position being eccentric to a rotation center of the surveying instrument;
identifying an object point corresponding to the mark in the captured image;
measuring image coordinates of the identified object point in the captured image; and
determining a height of the rotation center of said instrument above the ground based on the measured image coordinates and camera calibration data.
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Accused Products
Abstract
A method is disclosed for localizing, in relation to a mark located at a ground level, a surveying instrument having a housing including at least one camera. In at least one embodiment, the method includes aligning the vertical rotational axis of the surveying instrument with the mark using a pointing device; capturing an image of the ground below the housing with the camera arranged in a known camera position and orientation, wherein the camera position is eccentric to the rotation center of the surveying instrument; identifying an object point corresponding to the mark in the captured image; measuring image coordinates of the object point in the captured image; and determining the height of the rotation center of said instrument above the ground based on the image coordinates and camera calibration data. Furthermore, a surveying instrument for performing at least one embodiment of the method is disclosed.
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Citations
20 Claims
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1. A method for localizing, in relation to a mark located at a ground level, a surveying instrument having a housing including at least one camera, said method comprising:
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aligning a vertical rotational axis of the surveying instrument with said mark using a pointing device; capturing an image of the ground below the housing with said at least one camera arranged in a camera position and orientation, said camera position being eccentric to a rotation center of the surveying instrument; identifying an object point corresponding to the mark in the captured image; measuring image coordinates of the identified object point in the captured image; and determining a height of the rotation center of said instrument above the ground based on the measured image coordinates and camera calibration data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 20)
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11. A surveying instrument, comprising:
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a pointing device adapted to align a vertical rotational axis of the surveying instrument with a mark located at a ground level; at least one camera adapted to capture an image of the ground below the surveying instrument, said at least one camera being arranged in a camera orientation and position, said camera position being eccentric to a rotation center of the surveying instrument; an identifying unit adapted to identify an object point corresponding to said mark in the captured image; a measuring unit adapted to measure image coordinates of the identified object point in the captured image; and a processor adapted to determine a height of the rotation center of the surveying instrument above the ground based on the measured image coordinates and camera calibration data. - View Dependent Claims (12, 13, 14, 15, 18, 19)
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Specification