High-dynamic-range three-dimensional measurement method based on spectrum modulation and multispectral imaging

A multi-spectral imaging and high dynamic range technology, applied in the field of optical measurement, can solve the problems of measurement limitations of diffuse reflection objects, and achieve the effect of convenient three-dimensional measurement, easy realization, and avoiding multiple shooting

Active Publication Date: 2019-06-21
武汉斌果科技有限公司
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Problems solved by technology

This method can remove the specular reflection light well, but there are still limitations for the high dynamic range measurement of diffuse reflection objects

Method used

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  • High-dynamic-range three-dimensional measurement method based on spectrum modulation and multispectral imaging
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  • High-dynamic-range three-dimensional measurement method based on spectrum modulation and multispectral imaging

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specific Embodiment

[0046] Such as figure 1As shown, this embodiment provides a high dynamic range three-dimensional measurement method based on spectral modulation and multispectral imaging, including the following steps:

[0047] Step 1. Construct a fringe projection system, such as figure 2 As shown, it includes projection unit, multi-spectral imaging unit and computer data processing system. The projection unit and the multispectral imaging unit in the fringe projection system are calibrated respectively by the existing system calibration method. Specifically, the multispectral imaging unit is a multispectral camera, and the adopted camera has a spectral range of 400-700nm and includes 8 channels. The projection unit is a projector. Specifically, the projector includes a projection light source, a digital micromirror device, a projection lens, and a filter. The projection light source is an LED light source with R / G / B three colors, which can be achieved by using a monochromatic light sourc...

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Abstract

The invention discloses a high-dynamic-range three-dimensional measurement method based on spectrum modulation and multispectral imaging, which comprises the following steps: constructing a fringe projection system comprising a projection unit and an imaging unit, and obtaining system parameters through system calibration; the projection unit generating and projecting a plurality of phase shift stripe patterns to the surface of an object to be measured, and the imaging unit acquiring a multispectral stripe image sequence reflected by the object; on the basis of the multispectral stripe image sequence, making a pixel saturation judgment on each spectral channel image; performing multi-channel fringe image fusion based on a saturation judgment result, to obtain a fused fringe image sequence;calculating a wrapping phase based on the fused fringe image sequence, and obtaining absolute phase information through a phase unwrapping algorithm; and recovering the three-dimensional shape of themeasured object based on the system parameters and the absolute phase. By adopting the method, stripe imaging and three-dimensional measurement within a high dynamic range can be rapidly achieved under single exposure, repeated shooting of a traditional multi-exposure method is avoided, and the measurement efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a high dynamic range three-dimensional measurement method based on spectral modulation and multispectral imaging. Background technique [0002] The structured light three-dimensional measurement method belongs to the active optical measurement technology, which has the characteristics of simple structure, convenient measurement, fast speed and high precision. It has been widely used and researched in many fields such as industrial inspection, reverse engineering, and virtual reality. Although the structured light 3D measurement technology is very mature, it is still a very difficult problem to measure objects with high dynamic range. For example, the surface reflectance of metal parts, porcelain cultural relics and other objects has a wide range of changes. If the three-dimensional measurement of such parts is directly carried out, there will be a problem of high anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 王亚军罗斌王伟
Owner 武汉斌果科技有限公司
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