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A kind of projector lens distortion correction method

A technology of distortion correction and lens distortion, which is applied in the direction of using projection device image reproducer, instrument, image enhancement, etc., can solve the problems of complex correction structure or correction algorithm, and low precision of lens distortion correction technology, so as to eliminate errors and have Versatile, easy-to-implement effects

Active Publication Date: 2018-11-06
HEBEI UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing projector lens distortion correction technology has low accuracy, complex correction structure or correction algorithm, and there is no high-precision, simple and reasonable distortion correction method

Method used

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  • A kind of projector lens distortion correction method
  • A kind of projector lens distortion correction method
  • A kind of projector lens distortion correction method

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Experimental program
Comparison scheme
Effect test

Embodiment

[0062] The projector is a DLP digital projector of the model CP270 produced by BenQ, with a resolution of 1024×768 pixels, connected to the computer through a video interface, and connected to the manual lifting platform to adjust the vertical height;

[0063] The camera used for calibration is a Hitachi camera, its model is HVF22F, its resolution is 1360×1024 pixels, and it is connected to the IEEE1394 interface of the computer.

[0064] The camera used for verification is SVCam-ECO camera, the model is ECO655, the resolution is 2448×2050 pixels, and it is connected to the computer through the Gigabit network interface.

[0065] The cameras are connected to the support rods on the optical table through rod holders;

[0066] The calibration plate is a ceramic plate produced by Shenzhen Kechuang Times Co., Ltd., with 9 rows and 12 columns of circular marks on its surface. The distance between adjacent marks in the horizontal and vertical directions is 15 mm, and the accuracy is...

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Abstract

A method for correcting projector lens distortion. The projector is pre-calibrated to obtain the internal parameter A of the projector lens and the lens distortion coefficient kc. The lens distortion coefficient kc includes radial distortion coefficients kc(1), kc(2) and tangential distortion coefficients. Distortion coefficients kc(3), kc(4), the internal parameter A includes the lens focal length fc and the principal point cc. The correction method is to obtain a pre-distorted image after distortion pre-processing of the ideal image to be projected, and the pre-distorted image is processed by the projector After projection, it becomes an image without distortion.

Description

technical field [0001] The invention relates to an optical lens distortion correction method. Background technique [0002] The structured light 3D measurement system is mainly composed of a computer, a projector and a camera. Due to the existence of processing and assembly errors, there are differences between the optical lens of the projector and the ideal pinhole imaging model, so that the actual projected image is distorted. In order to improve the measurement accuracy of the 3D measurement system, the lens distortion of the projector must be corrected. [0003] The projector is a non-imaging device and cannot take images like a camera. The calibration method is more difficult than the camera and the accuracy is not very high. Most of the current research is on the calibration of projector lens parameters, such as Shujun Huang, LiliXie, Zhangying Wang, et al in "An accurate projector calibration method by using an optical coaxial system" (An accurate projector calibrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00H04N5/74
CPCH04N9/31G06T5/80
Inventor 张宗华王张颖刘小红张晓璇周舵黄淑君高楠
Owner HEBEI UNIV OF TECH