Three-dimensional information acquisition method for sampling points of three gray level symmetrical linear coding periods

Abstract

The invention provides a three-dimensional information acquisition method for sampling points of three gray level symmetrical linear coding periods. The three-dimensional information acquisition method includes steps of selecting the coding periods to prepare nine different gray level linear symmetrical phase-shift gratings of the three coding periods; projecting the gratings onto the surface of a detected object and obtaining nine stripe images by a stripe image acquiring device; calculating and obtaining relevant coding points corresponding to coding patterns in the coding periods, obtaining remainder equations of the sampling points in a frequency, leading the remainder equations to be simultaneous to obtain a congruence equation system of the sampling points in the three different coding periods, and adopting Chinese remainder theorem to confirm multiplying rate of the congruence equation system so as to obtain the solution of the equation system; and confirming projection angels of the sampling points and three-dimensional information of the sampling points according to a triangle principle. The three-dimensional information acquisition method overcomes shortcomings that in traditional double-frequency phase-shift three-dimensional measurement, errors are high, a measurement range is limited and the errors are accumulated and transmitted, and utilizes the non-contact three-dimensional measurement technology with high sampling density and precision.

Description

technical field [0001] The invention relates to computer sampling technology, in particular to a three-dimensional non-contact high-precision, error-free transmission three-dimensional measurement technology, three-dimensional information acquisition and reconstruction method. Background technique [0002] A large number of optical non-contact three-dimensional information acquisition technologies are widely used in modern industrial and agricultural production processes, among which structured light technology is widely used in reverse engineering, archaeology, In fields such as medicine, clothing, anthropometry, etc., it is necessary to restore the three-dimensional shape of the object. Structured light technology uses ordinary or laser as a light source to project a known pattern onto the surface of the object to be measured, and obtains three-dimensional information of the sampling point by using the triangulation principle based on the image obtained from another angle ...

AI Technical Summary

Problems solved by technology

[0006]Da Yanqiuyi was introduced into continuous sinusoidal coding structured light decoding. The current coding method uses two coding frequencies to sample the measured object. In addition to solving In addition to the congruence equation, it is also necessary to query the pre-calibrated error table for correction. The sampling accuracy of this type of technology has not been significantly improved.

[0007]The three-period sinusoidal encoding method is also used to unwrap the sinusoidal phase shift, but this method inevitably has a large amount of calculation in the sinusoidal phase shift method, and the projection encoding The problem with many patterns

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