CN101408408A - Image forming apparatus and strip detection method thereof - Google Patents

Image forming apparatus and strip detection method thereof Download PDF

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Publication number
CN101408408A
CN101408408A CNA2008101375998A CN200810137599A CN101408408A CN 101408408 A CN101408408 A CN 101408408A CN A2008101375998 A CNA2008101375998 A CN A2008101375998A CN 200810137599 A CN200810137599 A CN 200810137599A CN 101408408 A CN101408408 A CN 101408408A
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China
Prior art keywords
band
reflection mirror
plane
video camera
width
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Pending
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CNA2008101375998A
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Chinese (zh)
Inventor
杨水山
何永辉
王康健
王振龙
费江华
葛志静
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CNA2008101375998A priority Critical patent/CN101408408A/en
Publication of CN101408408A publication Critical patent/CN101408408A/en
Pending legal-status Critical Current

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Abstract

The invention aims at providing an imaging apparatus used for accurately measuring the width of belts and a belt measuring method thereof. The imaging apparatus consists of a first-class reflection plane mirror, a second-class reflection plane mirror and a camera. The first-class reflection plane mirror is positioned above the belts and the second-class reflection plane mirror is positioned above the belts and parallel to the first-class reflection plane mirror. For the imaging apparatus and the belt measuring method thereof, the imaging apparatus adopts the first-class reflection plane mirror and the second-class reflection plane mirror to reflect the beam which is generated by a light source and passes the belt border so as to guarantee that the beams passing the left and right borders of the belts to be distributed in the view of one camera and avoid the asynchronous image-collection caused by adopting a plurality of cameras so as to accurately measure the width of the belts.

Description

A kind of imaging device and band detection method thereof
(1) technical field
The present invention relates to measuring technique, is exactly a kind of imaging device and band detection method thereof specifically.
(2) background technology
Surface imperfection on-line detecting system based on machine vision has successfully applied to various continuous band production lines, as band steel, aluminium foil, Copper Foil, paper, plastics and textile etc., can realize to these strip surface defectives in real time, efficiently detect.The checkout equipment of the type relies on high-speed camera to take continuously the image of material mostly on production line, whether has defective and has which kind of defective in order to analyze, and such as width defective (super wide and narrow rule) and centering information, and defective such as is split in hole and limit.
On the band production line of high-speed motion, the visual imaging system adopts line-scan camera mostly.According to the difference that will take strip width and resolution of video camera, need the video camera of varying number to come side by side and parallel the shooting.When strip width greater than a camera coverage time, width measure need be taken the band boundary images by two video cameras and determine jointly.As can be seen from Figure 1, obtain the physical width L of band, can calculate (1) according to following formula:
L＝W-L 1×ResL-L 2×ResR (1)
Wherein, W is the band specified width, which width, refers generally to the visual field width of camera; ResL is a left side picture resolution; ResR is the right picture resolution.
There is following defective in prior art:
Because line array video camera works under the triggering of scrambler, the trigger pip of different cameral can not guarantee strict may cause images acquired asynchronous synchronously, and may there be delay in image in transmission course, makes L 1And L 2Measurement numerical value not strict on the same extension position of band, cause the strip width of calculating to have error.
(3) summary of the invention
The object of the present invention is to provide a kind of imaging device and band detection method thereof that can accurately detect strip width.
The object of the present invention is achieved like this: described imaging device is made up of first kind plane of reflection mirror 1, the second class plane of reflection mirror 2, band 3 and video camera 4; First kind plane of reflection mirror 1 is positioned at band 4 tops, the second class plane of reflection mirror 2 is positioned at band 4 tops and parallel with first kind plane of reflection mirror 1, and video camera 4 is arranged on the second class plane of reflection mirror, 2 tops.
Band detection method of the present invention is as follows:
(1) light source send, the fairing preface through the band border is mapped to video camera via first kind plane of reflection mirror, the second class plane of reflection mirror reversal;
(2) video camera receive that light source sends, from the light through border, the band left and right sides of the second class plane of reflection mirror reflection, imaging to band;
(3) obtain video camera and become the width that the white point highlights divides in the image; According to the width of the white point highlights branch that is obtained and the picture resolution of video camera, obtain strip width.
A kind of imaging device of the present invention and band detection method thereof, the first kind plane of reflection mirror and the second class plane of reflection mirror have been adopted in the described imaging device, by light source light that produce, through the band border is reflected, to guarantee that the light through border, the band left and right sides can be distributed in the visual field of a video camera, avoided adopting the nonsynchronous problem of the caused images acquired of a plurality of video cameras, can detect strip width exactly.
(4) description of drawings
Fig. 1 detects synoptic diagram for the band that prior art provides;
Fig. 2 is a kind of imaging device of the present invention and band detection method synoptic diagram thereof;
Fig. 3 directly receives the band detection method synoptic diagram of band left margin light for video camera of the present invention.
(5) embodiment
The invention will be further described for example below in conjunction with accompanying drawing.
Embodiment 1, in conjunction with Fig. 2, a kind of band detection method of the present invention principle is as follows: earlier identical with band specified width, which width W and not simultaneously to band physical width L, the band image is briefly introduced: if when band physical width L equals band specified width, which width W just, two boundary positions overlap with border, the camera visual field about band physical width L, so whole simulation band image is a black, can use shadow representation; If band physical width L is during less than band specified width, which width W, border, the band physical width L left and right sides is in camera coverage, and imaging is compared during for W with the band specified width, which width, and there is L on border, the image left and right sides 1And L 2Difference, so light source produce, the light through the band border is input in the video camera after two groups of plane of reflection mirror reflections, the both sides that make the band image are white point highlights branch.
A kind of imaging device of the present invention comprises: the first left side plane of reflection mirror I that lays respectively at band top left side and right side and the first right side plane of reflection mirror I ', respectively with the first left side plane of reflection mirror, the second left side plane of reflection mirror II parallel and the second right side plane of reflection mirror II ', video camera with the first right side plane of reflection mirror; Dotted arrow characterizes the virtual ray that is covered part by band among Fig. 2, and on behalf of light source, straight arrows directly take in the light of camera, and the fine dotted line arrow characterizes the separatrix on band border.
The first left side plane of reflection mirror I and the first right side plane of reflection mirror I ' respectively with angle at 45, band plane, towards the direction of motion of band and parallel band, and receive light that light source sends, beyond band left margin, right margin, the light that is received is reflexed to the second left side plane of reflection mirror II and the second right side plane of reflection mirror II ' respectively; The second left side plane of reflection mirror II reflexes to video camera with the light that is received along vertical band in-plane respectively with the second right side plane of reflection mirror II '.
Wherein, the first left side plane of reflection mirror I and the first right side plane of reflection mirror I ' are not limited to 45 ° with band plane angulation respectively, also can be other angles, such as 30 °, 60 °, do not influence realization of the present invention.
Definite mode of the first left side plane of reflection mirror I and the first right side plane of reflection mirror I ', the second left side plane of reflection mirror II and plane of reflection mirror II ' position, second right side needs to consider: the light of band left margin and right margin is respectively through two flat mirror reflects, so that it finally makes the light of both bounded sides can be distributed in the visual field of a video camera along past band intermediate transfer on the strip width direction.
Video camera receives the light from the second left side plane of reflection mirror II and the second right side plane of reflection mirror II ', and to the band imaging, its image as shown in Figure 2; Wherein, the white point highlights of the left and right sides of band image branch is respectively directly the light of light source to be reflected imaging from the second left side plane of reflection mirror II and the second right side plane of reflection mirror II '.
Embodiment 2, in conjunction with Fig. 3, a kind of video camera of the present invention directly receives the band detection method of band left margin light, and its imaging device comprises: be positioned at band top the first right side plane of reflection mirror, be positioned at band top and second right side plane of reflection mirror and the video camera parallel with the first right side plane of reflection mirror; The first right side plane of reflection mirror, be used to receive that light source sends, through the light of band right margin, and the light that is received reflexed to the second right side plane of reflection mirror; The second right side plane of reflection mirror is used for the light of the first right side plane of reflection mirror reflection is reflexed to video camera along vertical band in-plane; Consider that video camera directly receives the light of band left margin, so the position of the first right side plane of reflection mirror and the second right side plane of reflection mirror determines that mode needs to consider: the distribution of light that makes band left margin and right margin is in the visual field of a video camera.
Video camera receives the light of band left margin and from the light of the second right side plane of reflection mirror, to the band imaging, it is respectively from the light outside the band left margin and the light imaging of the second right side plane of reflection mirror that the white point highlights of the left and right sides of band image divides.
In like manner, video camera also can be positioned at the top on band right side, directly receive the light of band right margin, and the light of band left margin order is mapped in the video camera by the first left side plane of reflection mirror and the second left side plane of reflection mirror reversal, can realize purpose of the present invention equally.
Embodiment 3, and a kind of imaging device of the present invention and band detection method thereof realize according to described imaging device, border acquiring unit and data processing unit.
Light width acquisition unit, be used for obtaining the width that video camera becomes the white point highlights branch of the image left and right sides, be respectively L l, L r
The strip width acquiring unit is used to utilize the left side resolution ResL (mm/pixel) and the right side resolution ResR (mm/pixel) of image, uses following formula (2), obtains the physical width L of band;
L＝W-L 1×ResL-L r×ResR (2)
Wherein, the left side resolution ResL (mm/pixel) of image can be identical with right side resolution ResR (mm/pixel), also can, do not influence realization of the present invention.
Error of centralization computing unit is used for obtaining the deviation delta L of present image left margin l=L lThe deviation delta L of * ResL and right margin r=L r* ResR utilizes following formula (3), calculates the error of centralization in the band operational process;
ΔL＝|ΔL l-ΔL r|/2 (3)
Wherein, the error of centralization is the position deviation of band center line and band production equipment center line, and the error of centralization is also referred to as the sideslip yardstick.
Can obtain the physical width and the error of centralization of band by above description, wherein, work as L r=L lThe time error of centralization be 0.
Video camera does not influence the detection of defectives such as the limit that band is occurred is split, hole simultaneously to the photoimaging on border, the band left and right sides when measuring width thus.Simultaneously and other video cameras of column distribution, finish on the strip width direction other regional imagings in order to defects detection, and then finish the defects detection of whole band defective and the measurement of width dimensions.
A kind of band detection method of the present invention, concrete steps are as follows:
(1) light source light that send, beyond through physics band border is mapped to the second class plane of reflection mirror through first kind plane of reflection mirror reversal, is mapped to video camera by the second class plane of reflection mirror reversal again;
(2) video camera receives light that light source sends, beyond through border, the band left and right sides, and to band and border exterior domain imaging, the light on the border, the band left and right sides that described video camera receives is the light through the second class plane of reflection mirror reflection;
(3) obtain the width that video camera becomes the white point highlights branch of the left and right sides in the image; According to the width of the white point highlights branch that is obtained and the picture resolution of video camera, obtain strip width;
According to the width that video camera becomes the white point highlights of the left and right sides in the image to divide, obtain the deviation delta L of left margin in the present image l=L lThe deviation delta L of * ResL and right margin r=L r* ResR utilizes formula (3), calculates the error of centralization in the band production run.

Claims (2)

1. imaging device, it is made up of first kind plane of reflection mirror (1), the second class plane of reflection mirror (2), band (3) and video camera (4); It is characterized in that: first kind plane of reflection mirror (1) is positioned at band (4) top, the second class plane of reflection mirror (2) is positioned at band (4) top and parallel with first kind plane of reflection mirror (1), and video camera (4) is arranged on the second class plane of reflection mirror (2) top.
2. band detection method is characterized in that:
(1) light source send, the fairing preface through the band border is mapped to video camera via first kind plane of reflection mirror, the second class plane of reflection mirror reversal;
(2) video camera receive that light source sends, from the light through border, the band left and right sides of the second class plane of reflection mirror reflection, imaging to band;
(3) obtain video camera and become the width that the white point highlights divides in the image,, obtain strip width according to the width of the white point highlights branch that is obtained and the picture resolution of video camera.
CNA2008101375998A 2008-11-21 2008-11-21 Image forming apparatus and strip detection method thereof Pending CN101408408A (en)

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Application Number Priority Date Filing Date Title
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CN101408408A true CN101408408A (en) 2009-04-15

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101596556B (en) * 2009-06-10 2011-02-16 苏州有色金属研究院有限公司 Design method based on machine vision inspection centring control device
CN102721372A (en) * 2012-05-04 2012-10-10 西安理工大学 Bi-linear CCD-based strip width measurement method and system
CN102937596A (en) * 2012-10-23 2013-02-20 鞍钢股份有限公司 Strip steel surface image on-line frequency-conversion collection method
CN105209851A (en) * 2013-05-14 2015-12-30 安德罗伊德工业有限公司 Uniformity testing system and methodology for utilizing the same
CN107687810A (en) * 2017-08-21 2018-02-13 上海交通大学 A kind of high-precision bubble 3D shape of intelligence obtains system
CN110470673A (en) * 2019-08-09 2019-11-19 湖北华宁防腐技术股份有限公司 A kind of multichannel dope board checking device and its application method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101596556B (en) * 2009-06-10 2011-02-16 苏州有色金属研究院有限公司 Design method based on machine vision inspection centring control device
CN102721372A (en) * 2012-05-04 2012-10-10 西安理工大学 Bi-linear CCD-based strip width measurement method and system
CN102721372B (en) * 2012-05-04 2015-06-03 西安理工大学 Bi-linear CCD-based strip width measurement method and system
CN102937596A (en) * 2012-10-23 2013-02-20 鞍钢股份有限公司 Strip steel surface image on-line frequency-conversion collection method
CN102937596B (en) * 2012-10-23 2015-12-09 鞍钢股份有限公司 The online frequency-conversion collection method of a kind of band steel surface image
CN105209851A (en) * 2013-05-14 2015-12-30 安德罗伊德工业有限公司 Uniformity testing system and methodology for utilizing the same
CN107687810A (en) * 2017-08-21 2018-02-13 上海交通大学 A kind of high-precision bubble 3D shape of intelligence obtains system
CN110470673A (en) * 2019-08-09 2019-11-19 湖北华宁防腐技术股份有限公司 A kind of multichannel dope board checking device and its application method
CN110470673B (en) * 2019-08-09 2021-12-14 湖北华宁防腐技术股份有限公司 Multi-channel anti-corrosion rubber plate detection device and application method thereof

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Application publication date: 20090415