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AssigneeTopcon Corporation
InventorsKaoru Kumagai, Takahiro Inoue, Ken-ichiro Yoshino
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A three-dimensional measuring device includes a light source unit, a light projecting optical unit, a light receiving optical unit, a light receiving element, a scanning unit, an angle detector, an illumination light source unit, an image pickup unit and a control arithmetic unit. The control arithmetic unit comprises a distance data processing unit for controlling the scanning unit, for calculating a distance to the object to be measured based on a received light signal, and for calculating a three-dimensional data of the object based on a calculated distance and a detection signal from the angle detector, and an image data processing unit for acquiring an illuminated image and an unilluminated image, for acquiring a difference image based on both images, for detecting a retroreflective target based on the difference image and a detected intensity of a reflected light from the difference image, and for calculating a position of the target.
A three-dimensional measuring device comprising, a light source unit for generating a distance measuring light, a light projecting optical unit for projecting said distance measuring light from said light source unit on a distance measuring optical axis, a light receiving optical unit for receiving a reflected light from an object to be measured, a light receiving element for converting said reflected light condensed by said light receiving optical unit into an electric signal, a scanning unit for scanning said distance measuring light over said object to be measured, an angle detector for detecting an projecting direction of said distance measuring light scanned by said scanning unit, an illumination light source unit for projecting an illumination light having a plurality of wavelengths, an image pickup unit for acquiring two-dimensional images of said plurality of wavelengths and a control arithmetic unit, wherein said control arithmetic unit comprises a distance data processing unit for controlling a drive of said scanning unit, for calculating a distance to said object to be measured based on a received light signal from said light receiving element, and for calculating a three-dimensional data of said object to be measured based on a calculated distance and a detection signal from said angle detector and an image data processing unit for acquiring an image illuminated with said illumination light source unit and an unilluminated image by said image pickup unit, for acquiring a difference image based on both images, for detecting a retroreflective target based on said difference image and a detected intensity of a reflected light having a plurality of wavelengths detected from said difference image, and for calculating a position of said target.
A three-dimensional measuring system which comprises a three-dimensional measuring device installed at an arbitrary position and a target installed at a known position, comprising said three-dimensional measuring device including a light source unit for generating a distance measuring light, a light projecting optical unit for projecting said distance measuring light fromsaid light source unit on a distance measuring optical axis, a light receiving optical unit for receiving a reflected light from an object to be measured, a light receiving element for converting said reflected light condensed by said light receiving optical unit into an electric signal, a scanning unit for scanning said distance measuring light over said object to be measured, an angle detector for detecting an projecting direction of said distance measuring light scanned by said scanning unit, an illumination light source unit for irradiating an illumination light having a plurality of wavelengths, an image pickup unit for acquiring two-dimensional images of said plurality of wavelengths, an image data processing unit for acquiring an image illuminated with said illumination light source unit and an unilluminated image by said image pickup unit, for acquiring a difference image based on both images, and for detecting a retroreflective target from said object to be measured based on a relationship between said difference image and a detected intensity of reflected lights of a plurality of wavelengths detected from said difference image, and a distance data processing unit for calculating a distance to said target based on a received light signal from said light receiving element and for calculating a three-dimensional data of said object to be measured based on a calculated distance and a detection signal from said angle detector, wherein a position of said three-dimensional measuring device with respect to said target is calculated based on said calculated distance to said target and said projecting direction of said distance measuring light detected by said angle detector.
Dependencies are inferred from the claim text.