CN102855728A - Automatic calibration method of image-based fire detector - Google Patents
Automatic calibration method of image-based fire detector Download PDFInfo
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- CN102855728A CN102855728A CN2012103522076A CN201210352207A CN102855728A CN 102855728 A CN102855728 A CN 102855728A CN 2012103522076 A CN2012103522076 A CN 2012103522076A CN 201210352207 A CN201210352207 A CN 201210352207A CN 102855728 A CN102855728 A CN 102855728A
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Abstract
The invention provides an automatic calibration method of an image-based fire detector. Firstly, the image-based fire detector is horizontally installed, and an optical axis of a lens is adjusted well. Calibration rods are placed in a detection region of the detector, wherein one calibration rod is perpendicular to the optical axis of the lens of the detector, and a plane formed by the other calibration rod and the optical axis of the lens of the detector is perpendicular to a horizontal plane. Calibration lamps are switched on and placed the calibration lamps in a view field of the detector. The conversion between an image coordinate system and an actual coordinate system is finished by using the calibration method. The automatic calibration method is designed for the image-based fire detector, and is quick in calibration speed and high in accuracy degree.
Description
Technical field
The present invention relates to image and process, particularly the automatic calibration method of image-type fire detector.
Background technology
Image-type fire detector is to utilize the modes such as image processing algorithm, artificial intelligence analysis, the flame in the image is identified the specialized equipment of warning.Because all flame detection analytical work all is based on image and carries out, analyzing employed tolerance fundamental unit for the profile that appears at the flame in the image, shape, position etc. is pixel, and the position of flame also is to describe with the two-dimensional coordinate system at place, CCD plane.
But in the applied environment of reality, the position that flame occurs should be a point in the three dimensions, therefore how to pass through the in advance means of demarcation, with the pixel coordinate of flame in image, be converted to fast the true coordinate value in the actual scene, for realizing the quick location of flame in the scene of fire, thereby other self-extinguishing equipments that actively link have great use value to suppress the condition of a fire.
When image-type fire detector be installed in outdoor or during the occasion such as large space, how to make things convenient in the equipment debugging installation process, efficiently finishing equipment staking-out work is very important.The order of accuarcy of scaling method directly affects the warning precision of image-type fire detector.
Existing scaling method all is the scaling method with reference to general camera.For example application number provides a kind of camera calibration method and used caliberating device for 200710051485.7 Chinese patent, this patent is by the mode of manual intervention, in image, mark in advance pixel coordinate value and the true coordinate value of some calibration points, then carry out on this basis transformation calculations.
In sum, at present in the urgent need to proposing a kind of automatic calibration method of image-type fire detector.
Summary of the invention
In view of this, fundamental purpose of the present invention is to realize aiming at the automatic calibration method of image-type fire detector design.
For achieving the above object, according to first aspect of the present invention, provide a kind of automatic calibration method of image-type fire detector, the method comprises:
First step is installed the image-type fire detector level, adjusts camera lens optical axis and overlooks downwards to guarantee that the horizontal blanking line is in the visual field of detector;
Second step, lie in a horizontal plane in the surveyed area of image-type fire detector demarcating bar, and a bar wherein demarcating bar is vertical with the camera lens optical axis of image-type fire detector, and another root bar of demarcating bar is vertical with ground level with the plane that the camera lens optical axis of image-type fire detector forms;
Third step is turned on and is demarcated the power supply of demarcating lamp on the bar, and makes the demarcation lamp all be positioned at the visual field of image-type fire detector;
The 4th step, image-type fire detector is according to the demarcation lamp position that observes, and the spatial topotaxy between the known demarcation lamp, uses scaling method, finishes the conversion between image coordinate system and the true coordinate system.
Wherein, described demarcation bar comprises two each other 90 ° of bar and demarcation lamps that place at the angle.The length of bar is 2～5m, and two each other 90 ° of angles placements of bar can be cruciform, T-shaped and L-type.Demarcate lamp and formed by 4～8 groups of pointolites, and according to equidistantly being installed on two bars.Described pointolite can produce a large amount of emittance at near-infrared band, and wherein near-infrared band is 780～1100nm.
Compared with prior art, the present invention has following advantage: 1. use demarcation bar demarcation speed fast, promoted efficient; 2. do not need the in-site measurement data, reduced workload; 3. aim at the image-type fire detector design, reduced the error of thinking that factor causes, calibration accuracy is high.
Description of drawings
Fig. 1 shows the process flow diagram according to the automatic calibration method of image-type fire detector of the present invention.
Fig. 2 shows according to one of structural drawing of demarcation bar of the present invention.
Fig. 3 shows one of structural drawing of placing according to demarcation bar of the present invention.
Embodiment
The present invention has realized the method for the automatic Calibration of image-type fire detector.
Fig. 1 shows the process flow diagram according to the automatic calibration method of image-type fire detector of the present invention.As shown in Figure 1, the automatic calibration method according to image-type fire detector of the present invention comprises:
The 4th step 104, image-type fire detector is according to the demarcation lamp position that observes, and the spatial topotaxy between the known demarcation lamp, uses scaling method, finishes the conversion between image coordinate system and the true coordinate system.
Wherein, described demarcation bar comprises two each other 90 ° of bar and demarcation lamps that place at the angle.The length of bar is 2～5m, and two each other 90 ° of angles placements of bar can be cruciform, T-shaped and L-type.Demarcate lamp and formed by 4～8 groups of pointolites, and according to equidistantly being installed on two bars.Described pointolite can produce a large amount of emittance at near-infrared band, and wherein near-infrared band is 780～1100nm.
Fig. 2 shows according to one of structural drawing of demarcation bar of the present invention.As shown in Figure 2, two each other 90 ° of angles placements of bar can be cruciform (Fig. 2 (a)), T-shaped (Fig. 2 (b)) and L-type (Fig. 2 (c)), and the length of two bars is 2m, has placed 5 on two bars and has demarcated lamps.
Fig. 3 shows one of structural drawing of placing according to demarcation bar of the present invention.As shown in Figure 3, what the demarcation bar was selected is L-type, two pole lengths are 2m, demarcate 5 demarcation lamps are arranged on the bar, a bar demarcating bar is vertical with the camera lens optical axis of image-type fire detector, and another root bar of demarcating bar is vertical with ground level with the plane that the camera lens optical axis of image-type fire detector forms.
Scaling method can be realized by existing calibration technique in the 4th step 104.Document [Wei GQ for example, Ma SD. Implicit and explicit camera calibration, theory and experiment [J]. IEEE Trans Pattern Recognition and Machine intelligence, 1994,16 (5): 469 48] the tripleplane's matrixing method that proposes in.
Compared with prior art, the present invention has following advantage: 1. use demarcation bar demarcation speed fast, promoted efficient; 2. do not need the in-site measurement data, reduced workload; 3. aim at the image-type fire detector design, reduced the error of thinking that factor causes, calibration accuracy is high.
The above; being preferred embodiment of the present invention only, is not for limiting protection scope of the present invention, being to be understood that; the present invention is not limited to implementation as described herein, and the purpose that these implementations are described is to help those of skill in the art to put into practice the present invention.Any those of skill in the art are easy to be further improved without departing from the spirit and scope of the present invention and perfect, therefore the present invention only is subject to the restriction of content and the scope of claim of the present invention, and its intention contains all and is included in alternatives and equivalent in the spirit and scope of the invention that is limited by claims.
Claims (4)
1. the automatic calibration method of an image-type fire detector, the method comprises:
First step is installed the image-type fire detector level, adjusts camera lens optical axis and overlooks downwards to guarantee that the horizontal blanking line is in the visual field of detector;
Second step, lie in a horizontal plane in the surveyed area of image-type fire detector demarcating bar, and a bar wherein demarcating bar is vertical with the camera lens optical axis of image-type fire detector, and another root bar of demarcating bar is vertical with ground level with the plane that the camera lens optical axis of image-type fire detector forms;
Third step is turned on and is demarcated the power supply of demarcating lamp on the bar, and makes the demarcation lamp all be positioned at the visual field of image-type fire detector;
The 4th step, image-type fire detector is according to the demarcation lamp position that observes, and the spatial topotaxy between the known demarcation lamp, uses scaling method, finishes the conversion between image coordinate system and the true coordinate system;
Wherein, described demarcation bar comprises two each other 90 ° of bar and demarcation lamps that place at the angle.
2. the method for claim 1 is characterized in that, the length of described bar is 2～5m, and two each other 90 ° of angles placements of bar can be cruciform, T-shaped and L-type.
3. the method for claim 1 is characterized in that, described demarcation lamp is comprised of 4～8 groups of pointolites, and according to equidistantly being installed on two bars.
4. method as claimed in claim 3 is characterized in that, described pointolite can produce a large amount of emittance at near-infrared band, and wherein near-infrared band is 780～1100nm.
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| CN2012103522076A CN102855728A (en) | 2012-09-21 | 2012-09-21 | Automatic calibration method of image-based fire detector |
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| CN2012103522076A CN102855728A (en) | 2012-09-21 | 2012-09-21 | Automatic calibration method of image-based fire detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971479A (en) * | 2013-01-29 | 2014-08-06 | 北京林业大学 | Forest fire positioning method based on camera calibration technology |
| CN110992638A (en) * | 2019-12-24 | 2020-04-10 | 无锡商业职业技术学院 | Calibration method and calibration device for smoke detector |
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| JPH10253499A (en) * | 1997-03-11 | 1998-09-25 | Sony Corp | Calibration device and calibration method, and distortion correcting device and method therefor |
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| US20090185038A1 (en) * | 2008-01-21 | 2009-07-23 | Hartmut Boessmann | Caliberation element for calibrating the magnification ratio of a camera, and a calibration method |
| CN201590139U (en) * | 2009-09-28 | 2010-09-22 | 北京英特威视科技有限公司 | Monitoring system and protection device |
| CN101968356A (en) * | 2010-10-29 | 2011-02-09 | 常州市新瑞得仪器有限公司 | Digital leveling instrument |
| CN102521822A (en) * | 2011-10-25 | 2012-06-27 | 南京大学 | Active light-emitting type target for automatic calibration based on machine vision and calibrating method thereof |
| CN202304826U (en) * | 2011-11-02 | 2012-07-04 | 国家体育总局体育科学研究所 | Portable two-dimensional video calibration framework |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10253499A (en) * | 1997-03-11 | 1998-09-25 | Sony Corp | Calibration device and calibration method, and distortion correcting device and method therefor |
| CN101013505A (en) * | 2007-02-05 | 2007-08-08 | 武汉大学 | Camera calibration method and calibration apparatus thereof |
| US20090185038A1 (en) * | 2008-01-21 | 2009-07-23 | Hartmut Boessmann | Caliberation element for calibrating the magnification ratio of a camera, and a calibration method |
| CN201590139U (en) * | 2009-09-28 | 2010-09-22 | 北京英特威视科技有限公司 | Monitoring system and protection device |
| CN101968356A (en) * | 2010-10-29 | 2011-02-09 | 常州市新瑞得仪器有限公司 | Digital leveling instrument |
| CN102521822A (en) * | 2011-10-25 | 2012-06-27 | 南京大学 | Active light-emitting type target for automatic calibration based on machine vision and calibrating method thereof |
| CN202304826U (en) * | 2011-11-02 | 2012-07-04 | 国家体育总局体育科学研究所 | Portable two-dimensional video calibration framework |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103971479A (en) * | 2013-01-29 | 2014-08-06 | 北京林业大学 | Forest fire positioning method based on camera calibration technology |
| CN103971479B (en) * | 2013-01-29 | 2016-08-17 | 北京林业大学 | Forest fires localization method based on camera calibration technology |
| CN110992638A (en) * | 2019-12-24 | 2020-04-10 | 无锡商业职业技术学院 | Calibration method and calibration device for smoke detector |
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Application publication date: 20130102 |