Calibration device and method based on multi-laser distance measurement and angle measurement

Abstract

The embodiment of the invention provides a calibration device and a calibration method in 3D modeling. The method comprises the following steps: (1) projecting a plurality of light beams to a target object through the calibration device, and forming a plurality of light spots, i.e., calibration points, on the surface of the target object; (2) respectively carrying out distance measurement and angle measurement on the calibration points by utilizing a distance measurement module and an angle measurement module in the calibration device; (3) by taking the calibration device as an original point,calculating the coordinate of each calibration point according to the distance measurement value and the angle measurement value; and (4) determining the coordinates of a 3D model of the target object. The absolute size calibration for the target object is realized through the method of carrying out laser distance measurement and angle measurement on a plurality of points.

Description

technical field [0001] The invention relates to the technical field of shape measurement, in particular to the technical field of 3D shape measurement. Background technique [0002] At present, when using a visual method for 3D acquisition and measurement, the camera is usually rotated relative to the target object, or multiple cameras are set around the target object for simultaneous acquisition. For example, the DigitaL EmiLy project of the University of Southern California uses a spherical bracket to fix hundreds of cameras at different positions and angles on the bracket to achieve 3D acquisition and modeling of the human body. However, in either way, the distance between the camera and the target object needs to be short, at least within the range that can be arranged, so that the camera can collect images of the target object at different positions. [0003] However, in some applications, it is not possible to collect images around the target object. For example, whe...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that unless there is an accurate angle measurement device, the user is not sensitive to the angle, and it is difficult to determine the angle accurately; the size of the target object is difficult to accurately determine, such as the scene constructed by the 3D model of the above-mentioned riverside house

And the measurement error leads to the camera position setting error, which will affect the acquisition and synthesis speed and effect; the accuracy and speed need to be further improved

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