Digital fringe projection three-dimensional imaging system and method based on single-pixel detector

Abstract

The invention relates to a digital fringe projection three-dimensional imaging system and method based on a single-pixel detector, and the system and method combine a conventional high-precision digital fringe projection three-dimensional imaging technology with a single-pixel imaging mode with broadband imaging capability, reduce the broadband three-dimensional imaging cost, and improve the system precision. The method mainly comprises three processes of a digital fringe projection part, single-pixel reconstruction and three-dimensional depth information recovery, wherein a digital micromirror array is used for replacing a traditional physical grating, and a binary black and white fringe is used for simulating a sine fringe pattern according to a Bayer jitter technology in projection. Distortion stripes after object surface type modulation are imaged on a modulation target surface of an optical modulator through a lens, after the optical modulator is loaded with a Hadamard matrix formodulation, a single-pixel detector detects emergent light intensity, and a two-dimensional intensity graph is obtained through correlation operation. A two-dimensional intensity graph is obtained through four-step phase shift projection, the phase of an object to be measured is obtained through calculation, and after phase and height mapping work is completed, trapezoidal correction is conductedon the system.

Description

technical field [0001] The invention belongs to the field of precision optical three-dimensional imaging, and in particular relates to a single-pixel detector-based digital fringe projection three-dimensional imaging system and an imaging method. Background technique [0002] The human eye receives the external light intensity and wavelength changes through the visual system, and obtains a lot of information such as the brightness and color of the external things. The multi-pixel array detector (such as CCD and CMOS) invented by learning from the human retina has become the current two-dimensional imaging technology. the most important imaging device. With the continuous innovation of technology and the maturity of basic devices, two-dimensional imaging has realized integrated devices with various advantages such as low cost, high precision and small volume, but three-dimensional imaging technology has always been different from traditional imaging technology in terms of acc...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a digital fringe projection three-dimensional imaging system and imaging method based on a single-pixel detector, which solves the problem of low imaging accuracy of the single-pixel three-dimensional imaging system

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