CN105067626B - A kind of image visibility measuring method of multiple reflections formula - Google Patents
A kind of image visibility measuring method of multiple reflections formula Download PDFInfo
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- CN105067626B CN105067626B CN201510418162.1A CN201510418162A CN105067626B CN 105067626 B CN105067626 B CN 105067626B CN 201510418162 A CN201510418162 A CN 201510418162A CN 105067626 B CN105067626 B CN 105067626B
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Abstract
A kind of image visibility measuring method of multiple reflections formula.Solve in visibility measurement, the problem of measurement result is not directly perceived, instrument takes up space big.Using resolving power test target as object, two parallel plane mirrors are placed with low-angle at measurement apparatus two ends, by image of the digital camera acquisition resolution plate after multiple reflections.By analyzing the minimum lines pair in resolving power test target image, the measurement of visibility is realized.
Description
【Technical field】
The present invention relates to a kind of image visibility measuring method of multiple reflections formula, it is adaptable to which environmental monitoring can be shown in
Degree measurement.
【Background technology】
With the fast development of modern industry and technology, problem of environmental pollution becomes increasingly conspicuous, and the measurement of visibility is to people
Life and trip seem more and more important.
The method estimated can be used by measuring visibility moderate, and the measuring instruments such as atmospheric transmission instrument, scatterometer can also be used to survey
Amount.
Ocular estimate is directly perceived, measurement be visibility direct result.But it can see with that can not see that boundary is less apparent in observation,
Judge that appearance profile is from clear to fuzzy, can only be with human eye and subjective differentiation.And due to eyesight, interpretability, light source characteristic, habit
It is used to wait influence, necessarily cause larger error subjective.Different choice visibility marker is big with regard to quantity, distribution, yardstick
Small, light object etc. is difficult consistent.Because object is limited, the visibility value in several scopes can only be estimated, when can see
When spending very poor, it is difficult to observe accurate value.
It is similar with visual method, it can be realized and measured with image processing method.According to optical imaging concept, visibility is better,
Distinguishable object detail ability is better, and the acutance of object edge is bigger.If measured with resolving power test target, visibility is got over
It is good, can be with the smaller lines pair of resolution width.
Because visibility is different, the resolving power test target extra fine wire bar observed at a certain distance from is different.Use at computer
Reason system is analyzed, and obtains discernmible extra fine wire pair, and measures the width of extra fine wire pair, corresponding with the foundation of visibility value
Relation, by the extra fine wire bar in the resolving power test target picture that can recognize to realizing that the interval range of visibility is measured, i.e., every group line
Certain limit to visibility value can be corresponded to.
For same group of line for, because visibility is different, the image sharpness of collection has a difference, therefore edge is fuzzy
Degree is different, different by calculating obtained line thickness value.It therefore, it can set up the relation of line thickness and visibility value.
Photographic process, sampling of aerosol method and Optical Parametric are broadly divided into the method that visibility is measured using observation instrument
Number mensuration.
Although obtain is influenceed the definition photo of object to be that measurement visibility variation is most simple and direct by aerosol
Method, but due to being difficult that quantitative information is extracted from photo and picture, thus add the difficulty of practical application.
Sampling of aerosol method is come the number of indirect inverting visibility by the concentration of particulate in direct measurement air
Value.It is related to the optical characteristics of variety classes and yardstick particulate, light radiation and interparticle type of action in this method
And the tedious steps in sampling process so that its measurement accuracy is difficult to ensure that.Therefore come from measurement atmospheric optics characteristic parameter
It is most reliable measuring method to obtain visibility.
Optical parameter measurement method is generally divided into transmission-type, scatter-type and attenuation type.Disappear generally by laser measurement air
The method of backscatter extinction logarithmic ratio calculates visibility, comparatively, more objective, but measurement be not visibility direct numerical value, and rain,
Greasy weather observation is difficult.
【The content of the invention】
Present invention aim to address in existing visibility measurement, the measurement result objectivity of image method is poor, shoots or sees
Ranging is from remote；There is provided a kind of image visibility measuring method of multiple reflections formula for other roundabout problems of methods and resultses.
The image visibility measuring method for the multiple reflections formula that the present invention is provided, the hardware that this method is related to includes resolution ratio
Plate (1), the first plane mirror (2), the second plane mirror (3), the first digital camera (4), the second digital camera (8) and meter
Calculation machine processing system.
Specific measuring method is as follows：
Two pieces of plane mirrors are staggered relatively, resolving power test target (1) is fixed on the first plane mirror as object
(2) just to side, by the first digital camera (4) be fixed on the second plane mirror (3) just to opposite side, by second numeral
Camera (8) is fixed on the homonymy of the first plane mirror (2)；
It is last that resolving power test target shoots resolving power test target by two pieces of plane mirror multiple reflections, by the first digital camera (4)
The image of primary event is simultaneously transferred to computer processing system；Resolving power test target is shot by anti-twice by the second digital camera (8)
Image after penetrating；
Analyzed with computer processing system, obtain discernmible extra fine wire pair, it is corresponding with the foundation of visibility value to close
System, realizes the interval range measurement of visibility, and the general interval is a km.
The image gathered respectively with the first digital camera (4), the second digital camera (8), calculates the width of extra fine wire pair simultaneously
Ask poor, so as to realize in visibility value interval range obtained above, further measurement obtains the visibility of subdivided interval.
The image gathered with the first digital camera (4), the second digital camera (8) calculates dullness and asks poor, for combining
Extra fine wire is measured to obtained measurement result, visibility value is finally given.
By finely tuning the angle of two pieces of plane mirrors, the order of reflection that can be set, so that shooting distance is adjusted,
Realize the change of range.
Second digital camera (8) is used for correction resolution plate, mirror surface and got dirty caused measurement error.
Advantages and positive effects of the present invention：
The image visibility measuring method for the multiple reflections formula that the present invention is provided, employ two panels speculum group into optics
Reflected light path, operating distance is increased through multiple reflections, reduces the bulk of instrument, improves measurement result reliability；By dividing
Resolution plate extra fine wire bar to come improve image method measure visibility objectivity.
【Brief description of the drawings】
Fig. 1 is the structural representation of the image visibility measuring system for the multiple reflections formula that the present invention is provided.
In figure, 1 resolving power test target, 2 first plane mirrors, 3 second plane mirrors, 4 first digital cameras, 5,6 and 7 are
The image of resolving power test target after reflection, 8 second digital cameras.
Fig. 2 is the resolving power test target used.
Fig. 3 is the resolving power test target image shot under different visibility, and through the result of computer preliminary treatment, wherein Fig. 3
(a) it is thin in poor visibility of the visibility than Fig. 3 (b), the extra fine wire comparison diagram 3 (a) that Fig. 3 (b) can be differentiated.In image procossing
During, using algorithm, length is only met than the horizontally and vertically lines for definite value, and curved line is automatically deleted, so
Numeral in figure (2) is all automatically left out in figure 3.
【Embodiment】
Embodiment 1
Fig. 1 show the structural representation of the image visibility measuring system for the multiple reflections formula that the present invention is provided.The survey
Amount system includes resolving power test target (1), the first plane mirror (2), the second plane mirror (3), the first digital camera (4), the
Two digital cameras (8) and computer processing system () in figure slightly.Wherein the first plane mirror (2), the second plane mirror (3)
Reflective optical system is constituted, (5), (6), (7) are the images of the resolving power test target after reflection.
Specific measuring method is as follows：
Two pieces of plane mirrors are staggered relatively, resolving power test target (1) is fixed on the first plane mirror as object
(2) just to side, by the first digital camera (4) be fixed on the second plane mirror (3) just to opposite side；
Second digital camera (8) is fixed on to the homonymy of the first plane mirror (2)；
It is last that resolving power test target shoots resolving power test target by two pieces of plane mirror multiple reflections, by the first digital camera (4)
The image (7) of primary event is simultaneously transferred to computer processing system；
Analyzed with computer processing system, obtain discernmible extra fine wire pair.Set up unique right with visibility value
It should be related to, by the extra fine wire bar in the resolving power test target picture that can recognize, visibility value is divided into several interval ranges；
When being differed due to visibility value, the image edge acuity of same lines is different, therefore using acutance computational methods,
Line thickness is calculated, acutance is better, and the width calculation value of same lines is bigger.Therefore, in each interval range, by calculating
Machine Digital Image Processing calculated under width calculation, i.e., different visibility the width of same line pair, obtains different values, from
And the corresponding relation more segmented is set up with range of visibility in each small distance range, realize the measurement of visibility.
By the first digital camera (4) and the image measurements of the second digital camera (8), by analyzing gray value average
The difference of dullness is obtained, further combined with measurement extra fine wire to obtained result, visibility value is obtained.
By finely tuning the angle of two pieces of plane mirrors (2) and (3), the order of reflection that can be set, so as to adjust
Shooting distance, realizes the change of range.
Claims (3)
1. a kind of image visibility measuring method of multiple reflections formula, it is characterised in that the hardware that this method is related to includes resolution ratio
Plate (1), the first plane mirror (2), the second plane mirror (3), the first digital camera (4), the second digital camera (8) and meter
Calculation machine processing system；Specific measuring method is as follows：
Two pieces of plane mirrors are staggered relatively, it is being fixed on the first plane mirror (2) just using resolving power test target (1) as object
To side, by the first digital camera (4) be fixed on the second plane mirror (3) just to opposite side, by the second digital camera
(8) it is fixed on the homonymy of the first plane mirror (2)；
Resolving power test target shoots resolving power test target last time by two pieces of plane mirror multiple reflections by the first digital camera (4)
The image of reflection is simultaneously transferred to computer processing system；Resolving power test target is shot after two secondary reflections by the second digital camera (8)
Image；
Analyzed with computer processing system, obtain discernmible extra fine wire pair, corresponding relation is set up with visibility value, it is real
The interval range measurement of existing visibility, the general interval is a km；
The image gathered respectively with the first digital camera (4), the second digital camera (8), calculates the width of extra fine wire pair and asks poor,
So as to realize in visibility value interval range obtained above, further measurement obtains the visibility of subdivided interval；
The image gathered according to the first digital camera (4), the second digital camera (8), with reference to above-mentioned measurement extra fine wire to obtaining
Measurement result, calculates dullness and asks poor, finally give visibility value.
2. the image visibility measuring method of multiple reflections formula according to claim 1, it is characterised in that pass through fine setting two
The angle of block plane mirror, the order of reflection that can be set, so as to adjust shooting distance, realizes the change of range.
3. the image visibility measuring method of multiple reflections formula according to claim 1 or 2, it is characterised in that the second numeral
Camera (8) is used for correction resolution plate, mirror surface and got dirty caused measurement error.
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| CN1580738A (en) * | 2003-08-04 | 2005-02-16 | 成都易航信息科技有限公司 | Visibility measuring method and visitility monitoring instrument |
| CN1651904A (en) * | 2005-02-07 | 2005-08-10 | 北京交通大学 | Method and apparatus for testing low visibility of at mosphere |
| CN1804588A (en) * | 2006-01-06 | 2006-07-19 | 成都易航信息科技有限公司 | Self-calibrating atmosphere visibility measuring method and measuring system thereof |
| CN102254315A (en) * | 2010-05-17 | 2011-11-23 | 中国科学院城市环境研究所 | Atmospheric visibility observation method implemented by using double digital cameras |
| CN103256862A (en) * | 2012-12-14 | 2013-08-21 | 中国兵器工业第二0五研究所 | Standard comprehensive target board for rapid self-calibration of photoelectric system and measurement method for photoelectric system |
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Patent Citations (5)
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|---|---|---|---|---|
| CN1580738A (en) * | 2003-08-04 | 2005-02-16 | 成都易航信息科技有限公司 | Visibility measuring method and visitility monitoring instrument |
| CN1651904A (en) * | 2005-02-07 | 2005-08-10 | 北京交通大学 | Method and apparatus for testing low visibility of at mosphere |
| CN1804588A (en) * | 2006-01-06 | 2006-07-19 | 成都易航信息科技有限公司 | Self-calibrating atmosphere visibility measuring method and measuring system thereof |
| CN102254315A (en) * | 2010-05-17 | 2011-11-23 | 中国科学院城市环境研究所 | Atmospheric visibility observation method implemented by using double digital cameras |
| CN103256862A (en) * | 2012-12-14 | 2013-08-21 | 中国兵器工业第二0五研究所 | Standard comprehensive target board for rapid self-calibration of photoelectric system and measurement method for photoelectric system |
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Inventor after: Wei Yongjie Inventor after: Fan Xiaodong Inventor after: Ma Fu Inventor after: Wang Mengdan Inventor after: Che Jinchao Inventor after: Zhao Zihao Inventor after: Wei Qianyue Inventor before: Wei Yongjie Inventor before: Ma Fu Inventor before: Wang Mengdan Inventor before: Che Jinchao Inventor before: Zhao Zihao Inventor before: Wei Qianyue |
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