Defocusing grating projection 3-dimensional measurement method for motion object

Abstract

The invention discloses a defocusing grating projection 3-dimensional measurement method for a motion object. The method comprises steps of solving a phase error generated in motion by using a five-step phase shift method, performing phase error compensation by using impact of motion of a tested object on corresponding points on an image plane of a camera and a phase plane of a projector, and acquiring distribution of main value phases not affected by the motion. Pixels, phase orders of which jump abnormally due to the motion error, are searched by using a method of conducting motion error correction on the phase unwrapping process, then affected pixels in an adjacent area of pixels with phase orders jumping abnormally undergo phase order correction, corrected phase orders are utilized forphase unwrapping so as to acquire absolute phase distribution with the motion error eliminated, the tested object absolute phase not affected by the motion is acquired, then three-dimensional rebuilding is completed. The measurement method can measure a dynamic object highly accurately, effectively reduces motion ripples, and can acquire high-quality tested object 3D point cloud.

Description

technical field [0001] The invention relates to a defocused grating projection three-dimensional measurement method for moving objects, which belongs to the field of three-dimensional measurement in computer vision. Background technique [0002] The digital grating projection technology based on the DLP (digital light processing) projector can be divided into single projection and multi-projection measurement methods according to the number of projected gratings. The single projection measurement technology greatly reduces the time consumed for measurement. , and reduces the number of images to be projected, it can cope with the general measurement of moving objects, but the measurement accuracy is relatively weak, so when the accuracy requirements are high, it is still necessary to choose the method of projecting multiple gratings as an alternative method to achieve dynamic 3D measurement. In 2009, Lei and Zhang et al. proposed a scheme to generate a sinusoidal grating by ...

AI Technical Summary

Problems solved by technology

When measuring a dynamic object, due to the movement of the object, the grating that should be projected at a certain position on the surface of the object is shifted, resulting in the phase shift of the grating fringes collected by the measurement system at a specific position is different from the set value, making the There is a deviation between the solved phase value and the converted 3D information and the real value, and eventually motion ripples appear on the 3D reconstruction results, seriously affecting the accuracy and quality of the measurement results

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