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Three-dimensional digital imaging method based on structured light gray level vector

A three-dimensional digital and imaging method technology, applied in the field of three-dimensional imaging, can solve the problems of slow measurement speed and large amount of calculation, and achieve the effect of short time consumption, simple calculation and high spatial resolution

Active Publication Date: 2014-12-10
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of solving the phase, it needs to solve the arctangent function sum and perform phase expansion, which requires a large amount of calculation and slow measurement speed.

Method used

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  • Three-dimensional digital imaging method based on structured light gray level vector
  • Three-dimensional digital imaging method based on structured light gray level vector
  • Three-dimensional digital imaging method based on structured light gray level vector

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Embodiment 1

[0057] This embodiment describes the three-dimensional digital imaging device matched with the method of the present invention.

[0058] The three-dimensional digital imaging device matched with the method of the present invention mainly includes a digital projection lighting transmitter, an image sensing receiver and an image processor. Among them, the digital projection lighting transmitter can be a digital liquid crystal projection device (LCD projector), a digital micromirror projection device (DMD projector) or a silicon substrate liquid crystal projection device (LCOS projector), which can be easily generated by a computer image processing system. Combination of gray scale code and binary code for stripe pattern and write into digital projection device. The image sensing receiver includes an optical imaging lens and a photodetector. The optical imaging lens can be an imaging lens or lens group with a fixed focal length or a variable focal length, a binary optical imaging...

Embodiment 2

[0060] Such as Figure 5 In the shown structured light gray vector imaging system, the computer or digital signal processor of the image processor 104 generates a projection coded fringe pattern based on the gray vector three-dimensional digital imaging method. Each coding pattern is composed of coding stripes constituting the coding area and binary black and white marking stripes constituting the marking area; inside the coding area are coding stripes whose gray value increases and decreases alternately, and the gradient of the gray value can be used to distinguish between the same coding stripes different pixels within. In the present invention, each coded stripe width is called a period. There are only two cases of gray value in the identification area: 0 (black) and 1 (white). Its function is to combine the gray value of the coding area to form a unique vector, so as to distinguish pixels in different periods. . In the pattern sequence, the coding area of ​​each pattern...

Embodiment 3

[0069] This embodiment describes the corresponding point search process based on epipolar geometric constraints and coded values ​​in the present invention.

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Abstract

The invention discloses a three-dimensional digital imaging method based on a structured light gray level vector. The three-dimensional digital imaging method comprises the steps of coding structured light to generate a coded pattern sequence of the structured light gray level vector, orderly projecting the coded pattern sequence to the surface of an object, collecting the coded pattern sequence modulated by the surface of the object by use of a binocular camera and then storing the modulated coded pattern sequence in a computer, performing gray level vector decoding based on multiplication and addition on the modulated coded pattern sequence and finding out all corresponding point pairs of the binocular camera based on the epipolar geometric constraint of the binocular camera, and performing calculation according to the calibration parameters of a three-dimensional digital imaging system and the found corresponding point pairs to obtain three-dimensional point cloud data. The three-dimensional digital imaging method based on the structured light gray level vector has the advantages of high resolution ratio, low calculated quantity and high measurement speed, and can be widely applied to the technical field of three-dimensional imaging.

Description

technical field [0001] The invention relates to the technical field of three-dimensional imaging, in particular to a three-dimensional digital imaging method based on structured light gray vectors. Background technique [0002] Structured light measurement is a non-contact, active optical measurement method. The basic principle is to project the coded structured light onto the surface of the object through a projector, and after being modulated by the depth information of the object surface, it will be distorted, and then the image sensor will collect the deformed pattern, and the unique code value will be determined by decoding. If the positional relationship between the two binocular cameras, the left camera and the right camera, is determined, the three-dimensional depth information on the surface of the object can be understood by using the principle of triangulation. Structured light 3D vision technology has the advantages of non-contact, high precision, large field of...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 田劲东林贵文李东
Owner SHENZHEN UNIV
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