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Calibration method for projector

A calibration method and projector technology, which are applied in the fields of instruments, image analysis, and calculations, can solve the problems that the method accuracy depends on the absolute phase unwrapping accuracy, the preparation of special calibration equipment is troublesome, and the calibration algorithm is complex, etc. Simple calculation method

Inactive Publication Date: 2015-05-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] The existing calibration problems of projectors mainly include: (1) The preparation of special calibration equipment is cumbersome and the cost is high; (2) The calibration algorithm used is complicated, and the accuracy of some methods depends on the accuracy of absolute phase expansion, and some require grayscale interpolation and linear fit

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  • Calibration method for projector
  • Calibration method for projector

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] In this embodiment, the camera used is the MVC1300SAM / C-GE60-N00 camera of the Gigabit network area array CMOS camera series of the micro-view image, the resolution is 1280*1024, the pixel size is 5.3μm*5.3μm, and the lens is selected The Computar lens of Japan CBC Company, the model is M1614-MP2, the focal length is 16mm; the projector uses Texas Instruments LightCrafter TM Evaluation Module, the resolution is 608*684;

[0031] The calibration method in this embodiment mainly includes the following two parts, one part is the preparation of the calibration equipment for shooting, and the...

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Abstract

The invention discloses a calibration method for a projector. The calibration method can be implemented by using camera equipment, projector equipment, a lattice array calibration plate and grid projection pattern. The calibration method comprises the following steps: firstly, the camera shoots to obtain a lattice photo of the calibration plate at a shooting position of the lattice array calibration plate; the projector projects grid pattern onto the plate surface by keeping the position of the calibration plate unchanged; the camera shoots again to obtain a photo of the calibration plate with projection pattern; then the shot calibration plate lattice array photo is used and a two-dimensional target surface calibration method is adopted to calibrate the camera; finally, the image coordinate of grid angular points on the photo is obtained through performing image processing on the shot photo with the projection pattern; the world coordinate of the angular points is obtained by utilizing the camera calibration result or the crossratio invariance principle, so that calibration on the projector can be finished with the aid of known grid projection pattern. According to the calibration method for the projector, the calibration device is convenient to manufacture and rapid in calibration process.

Description

technical field [0001] The invention belongs to the technical field of machine vision calibration, and relates to a projector calibration method based on a point array calibration board and image processing technology. Background technique [0002] Structured light three-dimensional measurement technology has the advantages of non-contact, high precision, high speed, etc., and its measurement results are conveniently interfaced with a variety of software, which makes it widely used in scientific analysis, bioengineering, industrial production and other fields. In structured light measurement, there is a three-dimensional measurement system consisting of a single camera and a single projector. This system has a simple structure and high measurement efficiency, but its measurement system must involve the calibration of the camera and projector. There are relatively mature calibration methods for camera calibration. However, a projector is not an imaging device, and it can be r...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 卢文龙雷震刘晓军周莉萍
Owner HUAZHONG UNIV OF SCI & TECH
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