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Speckle-pattern-based method and device for calibrating monocular measurement system

A technology of measurement system and calibration method, which is applied in the field of single camera calibration, can solve the problems of poor operability and low measurement accuracy, and achieve the effect of low cost and avoiding extraction and matching

Active Publication Date: 2014-06-18
XIAN XINTUO 3D OPTICAL MEASUREMENT TECHN
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AI Technical Summary

Problems solved by technology

When calibrating a monocular measurement system composed of a single camera and a projector, the traditional single camera and single projector 3D scanning system uses the phase value to calculate the height information of the measured object, which has poor operability and low measurement accuracy

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  • Speckle-pattern-based method and device for calibrating monocular measurement system

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the device involved in the calibration method of the embodiment of the present invention is mainly composed of a digital raster projector 1 , an industrial CCD camera (including a lens) 3 , a beam 2 , a wiring harness 4 , and a computer 5 .

[0028] The monocular measurement system based on the speckle pattern belongs to a non-contact optical measurement system, which is different from the traditional binocular stereo vision system. Therefore, a digital grating projector 1 is used in this device to replace one of the binocular stereo vision systems. CCD camera, using speckle pattern instead of laser or structured light to calibrate the projector. refer to figure 2 , where the projection process of the projector is regarded as a reverse camera, thus forming a traditional binocular vision system, and then literature 1 (Digit...

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Abstract

The invention discloses a speckle-pattern-based method for calibrating a monocular measurement system. The method comprises the following steps: calibration plate image collection, calibration plate image detection, speckle pattern collection, projector calibration image generation, and self-calibration of a measurement system formed by a single camera and a projector. The invention also discloses a calibration device. The calibration device comprises a digital grating projector (1), an industrial charge-coupled device (CCD) camera (3), and a computer (5), wherein the computer comprises an image collection control unit, a projector projection control unit, a calibration plate image detection unit and a camera parameter calibration unit. By adopting the method and the device, the high-accuracy calibration on the monocular measurement system can be quickly and efficiently finished, and the method and the device have the characteristics of being simple and convenient to operate, practical, flexible, and accurate and reliable in result.

Description

technical field [0001] The invention belongs to the field of single-camera calibration in machine vision, and in particular relates to a speckle pattern-based calibration method and device for a monocular measurement system. Background technique [0002] Calibration is the prerequisite for the measurement system to obtain accurate results. When calibrating a monocular measurement system composed of a single camera and a projector, the traditional single camera and single projector 3D scanning system uses the phase value to calculate the height information of the measured object, which has poor operability and low measurement accuracy. [0003] Introducing the 3D reconstruction technology of stereo vision into a single-camera and single-projector scanning system, using speckle images to realize the matching of projectors and cameras, and performing 3D reconstruction according to the principle of binocular vision, is expected to improve the measurement accuracy, the key of whi...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C11/00G01C25/00
Inventor 唐正宗任茂栋魏斌
Owner XIAN XINTUO 3D OPTICAL MEASUREMENT TECHN
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