Optical three-dimensional profile measuring method of self-adaptation multi-frequency space-time color coding

Abstract

Provided is an optical three-dimensional profile measuring method of self-adaptation multi-frequency space-time color coding. The method comprises the steps that firstly, a white image is projected on a to-be-tested object, a coding pass suitable for a surface reflection characteristic of the object is obtained through self-adaptation; and then, by using multi-frequency multi-color stripes to form a cyclical combined stripe, local space coding on the stripe is completed; finally, time coding is carried out on the cycle of the space coding by using Grey binary coding. A coded pattern is projected to carry out measuring on a profile, and three-dimensional profile data of a measured target are obtained. On the premise of guaranteeing the measuring efficiency, the problems of the color coding measuring precision and the decoding reliability are solved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric measurement, and relates to an optical three-dimensional profile measurement method, in particular to an optical three-dimensional profile measurement method with adaptive multi-frequency space-time color coding. Background technique [0002] Optical three-dimensional profilometry technology has always been a research hotspot in the field of three-dimensional sensing and metrology, and is widely used in manufacturing, computer-aided medicine, virtual reality, and cultural heritage protection. Because of its non-contact, non-destructive, fast speed, high precision and other characteristics, it becomes the most ideal means of contour shape measurement. [0003] The structured light three-dimensional profilometry method demodulates the three-dimensional information of the measured object field according to the light field projected on the object and the geometric relationship between the projec...

AI Technical Summary

Problems solved by technology

The spatial coding method generally uses a color pattern, and only one projection is needed to obtain the depth image of the measured object, which is suitable for dynamic measurement, but the resolution cannot meet the requirements at present, and the coding pattern is susceptible to noise points caused by different surface characteristics of the scene Affected, decoding errors occur; in addition, the use of color patterns will introduce RGB channel misalignment errors and cross-colors, reducing measurement accuracy

Binary coding is often used for time coding to combine multiple different projection pattern coding sequences for decoding, and the decoding error rate is low, but the method requires that the projection space position remains unchanged and multiple projections are performed, so the measurement speed is affected

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