Research On Multiple Grayscales Gray Code Three Dimensional Measurement Technology

3D vision measurement technology is the key development direction of 3D measurement field, which is an active structure light 3D measurement method has the advantages of low cost, high resolution and speed advantage and practicability, the measurement technology is a relatively mature two gray Gray code measurement, through structure light irradiation on the measured object the reflected light, receiving and encoding and decoding, the final restoration pattern, this method does not need to contact the surface of the object, but also it has high anti-interference ability, suitable for the measurement of precious objects, but it needs 10 pieces of pattern to complete the measurement task, measuring speed is limited, therefore, this article from the two gray level gray mature 3D measurement method starting, according to the measured object in the static situation, multi gray level measurement method of three-dimensional gray code pattern less.In two gray level gray code encoding and decoding on the basis of theoretical analysis, using a plurality of gray level coding pattern formation, under the same conditions retained the two gray level gray code of high anti-interference ability, and can effectively reduce the number of coding patterns, significantly improve the efficiency of measurement. In four gray level five bit gray as an example of the multi gray level gray code encoding and decoding principle are described. In order to further reduce the number of coding pattern and improve the coding efficiency, the gray scale gray code and RGB color space model combined gray color multi gray level method for 3D measurement research.The two gray level Gray coded image of a binary method based on design multi gray level Gray coded image normalization scheme, study the multi gray level gray multi valued threshold selection method, and then the normalized image coding adaptive multi value. The experiment method of adaptive multi value multi gray level image gray code.The simulation and real experiments on the standard plane and complex surface with gray scale gray code and multi colored gray level gray two kinds of measuring methods. Experimental results show that within the depth range, the four gray level gray measurement method, measured plane of the variance is less than, measurement error is less than; the four colored gray level gray code method for measuring, measured plane variance less than, the measurement error is less than. The reconstructed complex surface is smooth and delicate, and it can reflect the details of the surface, which is the same as the visual effect of the surface. Experimental results verify the validity and feasibility of the method.This paper provides a method of high accuracy and high sampling density and the theoretical and experimental basis for the construction of three-dimensional measurement, which promotes the development and application of structured light 3D measurement technology.This paper provides a method of high accuracy and high sampling density and the theoretical and experimental basis for the construction of three-dimensional measurement, which promotes the development and application of structured light 3D measurement technology.