Three-dimensional visual measuring system based on high-speed triangle wave fringe projection principle

A three-dimensional vision and measurement system technology, applied in the field of three-dimensional vision measurement systems, can solve the problems of difficult calibration of defocus models and small working depth of field, and achieve the effects of improved projection time, easy timing, and light weight.

Inactive Publication Date: 2018-10-19
BEIHANG UNIV
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Problems solved by technology

This method also has many shortcomings such as difficult calibration of the defocus model and small working depth of field.

Method used

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  • Three-dimensional visual measuring system based on high-speed triangle wave fringe projection principle
  • Three-dimensional visual measuring system based on high-speed triangle wave fringe projection principle
  • Three-dimensional visual measuring system based on high-speed triangle wave fringe projection principle

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Embodiment Construction

[0021] Such as figure 1 As shown, the present invention includes a DMD high-speed projector (1), two high-speed industrial cameras (2) and a computer (3). The high-speed projector (1) is composed of a main control circuit (5), a DMD projection array (6), an LED light source (7), a trigger unit (8) and a communication module (9). During work, the computer (3) transmits the structured light information to be projected to the communication module (9) of the DMD high-speed projector (1) through the USB (Universal Serial Bus architecture) interface, and the communication module transmits the data via the main control The circuit (5) is compiled into an inversion signal of the DMD projection array (6), and at the same time controls the LED light source (7) to adjust brightness. The trigger unit (8) is synchronized with the projector, triggers the high-speed camera (2) to take pictures of the measured object (4), and transmits the obtained image information to the computer (3) for t...

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Abstract

The invention relates to a three-dimensional visual measuring system based on high-speed triangle wave fringe projection principle. The system mainly comprises a DMD (Digital Micro-mirror Device) projector, a high speed industrial camera and a computer, wherein the DMD projector consists of a DMD micromirror array, an LED (Light Emitting Diode) light source, a triggering circuit and a main controlcircuit. During the work, a black and white pattern is projected at the surface of an object to be measured by the DMD projector; meanwhile, the high speed camera is triggered for performing image shooting. The computer performs data processing and three-dimensional resolving on the shot image; the morphology information at the surface of the object to be measured is obtained. A specific black and white pattern is projected; a plurality of patterns are superimposed into a triangle wave fringe; the high-speed projection is realized. Compared with that of a traditional sinusoidal grating projection method, the speed is improved by 12 times or higher. Meanwhile, a triangular wave phase resolving method of a phase shifting method is used; after the provided high-speed measuring principle is concretely implemented, the high-speed three-dimensional measurement can be realized.

Description

technical field [0001] The invention relates to a three-dimensional visual measurement system based on the principle of high-speed triangular wave fringe projection. It mainly uses high-speed projection and synchronous camera control technology to realize rapid measurement of object surface topography, save measurement time, and reduce environmental interference. It is especially suitable for industrial on-site measurement. , Dynamic object measurement. Background technique [0002] Optical three-dimensional shape measurement technology has been widely used in industrial measurement, pattern recognition, reverse engineering and other fields, showing broad application prospects. Although the existing measurement method based on surface structured light photography measurement method has many advantages such as simple structure, dense point cloud, high measurement accuracy, and low system noise, with the improvement of industrial production automation level, this technology ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00
CPCG01C11/00G01C11/36
Inventor 赵慧洁刁晓淳姜宏志许阳
Owner BEIHANG UNIV
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