Patent ID: 8483442

Claim:
A measurement apparatus comprising: an image memory to store an image captured by a camera; a three-dimensional point cloud model memory to store a point cloud which is formed by a point cloud measured by a laser device and of which a three-dimensional position is known as a three-dimensional point cloud model; a processor programmed to discriminate a three dimensional position of a measurement image point; an image displaying unit to display and superimpose the image and a three-dimensional point cloud model, which corresponds to the image out of the three-dimensional point cloud model stored in the three-dimensional point cloud model memory, on a screen of a displaying device, and to prompt a user to specify a position within the image wherein the processor is further programmed to receive the position within the image specified by the user as the measurement image point from an inputting device, detect based on whether a point of the point cloud is displayed within the image, a corresponding point corresponding to the measurement image point from the point cloud of the three-dimensional point cloud model stored by the three-dimensional point cloud model memory; and discriminate a three-dimensional position of the measurement image point using a three-dimensional position of the detected corresponding point wherein the processor is further programmed to: calculate a vector showing direction from a center of the camera to the imputed measurement image point and calculate a particular plane including the detected corresponding point, obtain a three-dimensional position of the detected corresponding point as a first candidate showing a three-dimensional position of the measurement image point, and calculate an intersecting point of the particular plane and the vector as a second candidate showing the three-dimensional position of the measurement image point, wherein the measurement apparatus further comprises: a position displaying unit to display the first candidate and the second candidate on the screen of the displaying device and to prompt the user to specify one of the first candidate and the second candidate; and a result memory unit to store one of the first candidate and the second candidate specified by the user as the three-dimensional position of the measurement image point.