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Method for fast and high-precision extraction of light bar center sub-pixel

A light strip center and extraction method technology, which is applied in image analysis, image data processing, and the use of optical devices, etc., can solve the problem of high reflection of light strip images and uneven overall illumination, affecting the integrity and accuracy of light strip extraction, and lighting environment Complicated problems, to achieve the effect of improving accuracy, improving efficiency, and comprehensive performance

Inactive Publication Date: 2018-02-13
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the lighting environment of the large-scale curved surface measurement site is complex, the light strip image taken has local high reflection and overall uneven illumination, and the light strip in

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  • Method for fast and high-precision extraction of light bar center sub-pixel
  • Method for fast and high-precision extraction of light bar center sub-pixel
  • Method for fast and high-precision extraction of light bar center sub-pixel

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Embodiment Construction

[0034] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0035] In this embodiment, the surface of the measured object 1 is a 2.5m×3.0m t800 composite material plate, and the blue-violet laser with a wavelength of 460nm is vertically projected onto the measured object 1 .

[0036] The invention adopts a camera equipped with a wide-angle lens to shoot light strip images. The camera model is view works VC-12MC-M / C 65 camera, resolution: 4096×3072, image sensor: CMOS, frame rate: full frame, maximum 64.3fps, weight: 420g. The wide-angle lens model is EF 16-35mm f / 2.8L II USM, the parameters are as follows, lens focal length: f=16-35mm, APS focal length: 25.5-52.5, aperture: F2.8, lens size: 82×106. The shooting conditions are as follows: the picture pixel is 4096×3072, the focal length of the lens is 25mm, the object distance is 750mm, and the field of view is about 850mm×4...

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Abstract

The invention discloses a method for fast and high-precision extraction of light bar center sub-pixel, belongs to the technical field of computer vision measurement, and relates to the method for fastand high-precision extraction of the light bar center sub-pixel.Based on a local quadratic curve approximation, the method can quickly solve the normal direction of the light bar and calculate a light bar sub-pixel center by a second order Tailor expansion.Firstly, the center position of the initial light bar is extracted by using the threshold light bar center with fast operating rate, the normal direction of the light bar of an initial center point position is quickly solved by the local quadratic curve approximation method, and a light bar center of sub-pixel accuracy is solved after normalization processing by using the second order Tailor expansion of an image function on the initial center point position. The method simplifies the solution of the normal direction of the light bar, and extracts the center coordinates of the sub-pixel of the light bar with high precision in the normal direction so as to achieve high precision and high efficiency dual requirements. In view of the complex illumination environment and measurement object in the scene, the adaptability and robustness are stronger, and the overall performance is better.

Description

technical field [0001] The invention belongs to the technical field of computer vision measurement, and relates to a fast and high-precision method for extracting sub-pixels in the center of a light strip. Background technique [0002] In order to restore the three-dimensional information of the surface of the workpiece to be measured, the extraction of high-precision surface feature information is particularly important. In the measurement scheme using binocular vision combined with auxiliary line laser scanning, the line laser stripes are projected on the surface of the measured object, and the center of the modulated laser stripes reflects the spatial position information of the measured object. Therefore, accurate light strip center extraction is the key to realize high-precision measurement of three-dimensional shape and surface. [0003] At present, the commonly used light bar center extraction methods mainly include extreme value method, threshold method, gray scale ...

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Application Information

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IPC IPC(8): G01B11/24G06T7/136G06T7/66
Inventor 刘巍叶帆赵海洋兰志广张致远张洋马建伟贾振元
Owner DALIAN UNIV OF TECH
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