Three-dimensional information acquisition method of mixed structured light based on phase encoding

Abstract

The invention discloses a method for acquiring three-dimensional information of frequency mixing structured light based on phase encoding, mainly solving the problems of low measuring precision, low spatial resolution and long consumed time of the traditional three-dimensional information acquiring method. The method is realized through the steps: designing a double-color stripe template with two kinds of frequency information and changed strength; projecting the double-color stripe template on an objected to be measured by using a projector, and recording a deformed stripe image by using a camera; solving the color and strength phase distribution of the deformed stripe image; calculating truncation phase expansion values of pixel points in the deformed stripe image according to the color and strength phase distribution; confirming matching points of the pixel points in the projected template according to the truncation phase expansion values; and solving the three-dimensional coordinate value of each pixel point in the deformed stripe image according to a triangulation theory and the coordinates of the matching points. The method has the advantages of high space resolution, high measuring precision and high measuring speed and can be used for acquiring the three-dimensional information of dynamic objects.

Description

technical field [0001] The invention belongs to the technical field of measurement, and particularly relates to three-dimensional information acquisition of static or dynamic objects, which can be used for human-computer interaction, virtual reality, reverse engineering, and three-dimensional reconstruction of cultural relics. Background technique [0002] With the rapid development of science and technology, the acquisition of three-dimensional information of objects has broad application prospects in many application fields, such as production automation, human-computer interaction, medical diagnosis, reverse engineering, digital modeling, etc. Among them, structured light measurement, as a non-contact 3D information acquisition technology, has been widely used due to its advantages of simple implementation, fast speed and high precision. [0003] The basic idea of ​​the structured light 3D measurement method is to use the geometric relationship of the structured light pro...

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Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a method for acquiring three-dimensional information of mixed-frequency structured light based on phase encoding, so as to increase the speed of phase unwrapping without increasing the complexity of the equipment by using a single template. , to achieve high-precision, high-resolution three-dimensional information acquisition suitable for dynamic target objects

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