CN105741307A - Method for automatically identifying reading of pointer type pressure meter - Google Patents
Method for automatically identifying reading of pointer type pressure meter Download PDFInfo
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- CN105741307A CN105741307A CN201610120575.6A CN201610120575A CN105741307A CN 105741307 A CN105741307 A CN 105741307A CN 201610120575 A CN201610120575 A CN 201610120575A CN 105741307 A CN105741307 A CN 105741307A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/30—Noise filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/40—Document-oriented image-based pattern recognition
- G06V30/42—Document-oriented image-based pattern recognition based on the type of document
- G06V30/422—Technical drawings; Geographical maps
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30164—Workpiece; Machine component
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Abstract
The invention discloses a method for automatically identifying reading of a pointer type pressure meter, comprising steps of collecting a pressure meter dial image through an industrial camera, performing pre-processing on the image, enhancing the image contrast, reducing noise, improving the accuracy of automatic identification by the pressure meter in the later stage, performing segmentation on the dial zone, enabling each zone to correspond to the main scale reading; determining the position condition of the pointer between the scale lines;and separately calculating the main scale, the subdivision scale and the pointer line position reading so as to obtain the final reading of the pointer. The method is simple in algorithm principle, good in robustness and high in identification accuracy and can be widely applied in the instrument calibration technology.
Description
Technical field
The present invention relates to instrument calibration technical field, especially relate to a kind of pointer pressure reading automatic identifying method.
Background technology
Pressure gauge is with flexible member for sensing element, measures and indicates the instrument higher than ambient pressure, and it has a wide range of applications in industrial and agricultural production and scientific research field as a kind of measurement instrument, has been put into state compulsion calibrating catalogue.Pointer pressure is to apply one of most common pressure measuring instruments in current production process, various in style, enormous amount.Standard metering department and maintenance department, manufacturing process it is frequently necessary to instrument is examined and determine, in decades, in the industry commonly used heavy human meter examine and determine mode instrument is carried out verification calibrating.But, adopt manual operation to examine and determine Pressure gauge, labor intensity is big, and calibrating efficiency is low, and precision is affected greatly by artificial subjective factor, and automaticity is low, and lacks objective science evaluation examination criteria and foundation.
Therefore, it is achieved manometric automatic Verification is significant.Development along with computer image processing technology, the automatic Verification technology being currently based on pointer pressure mainly adopts preset angle configuration, the idiographic flow of the method is: first passes through image processing algorithm acquisition dial plate and initiates and terminate graduation mark, calculate the angle between two graduation marks, the each graduation mark of dial plate is finely divided, set up graduation mark and angle look-up table one to one, secondly, obtain hand of dial position, calculate the angle between pointer and start index line, finally by calculating pointer angle accounting size and being multiplied by scale conversion coefficient and can obtain final dial reading size.The method principle is simple, however it is necessary that and is first accurately positioned disc centre position and extracts graduation mark profile, and in actual mechanical process, precision is not high, and the whether accurate accuracy on reading that hand of dial extracts affects relatively larger.
Summary of the invention
In order to solve above-mentioned technical problem, it is an object of the invention to provide the pointer pressure reading automatic identifying method that a kind of algorithm is simple, precision is high and robustness is good.
The technical solution adopted in the present invention is: a kind of pointer pressure reading automatic identifying method, comprises the following steps:
A, gather Pressure gauge dial plate image by industrial camera, image is carried out pretreatment, strengthens picture contrast, reduce noise, improve later stage Pressure gauge and automatically identify accuracy；
B, contingency table disk area, position dial plate center, extracts dial scale line；
C, calculating dial plate master calibration reading；
D, judge pointer situation between graduation mark；
E, calculating dial plate segmentation scale reading；
F, computer chart index line position reading.
Further, described step B, comprising:
It is also carried out circumscribed circle matching by B1, extraction Pressure gauge dial plate border circular areas, calculates circumscribed circle home position and is dial plate center；
B2, establishment annulus measured zone, accurately extract dial scale line by image processing algorithm, and graduation mark is divided into main scale mark and segmentation graduation mark；
B3, location main scale mark center, it is connected with dial plate center, his-and-hers watches disk area is split, and each region is corresponding with master calibration reading.
Further, described step C, comprising:
C1, establishment annulus measured zone, pointer center in the annulus measured zone of location；
C2, judging whether pointer center is in reading area, if it is not, then show that pointer is in outside range ability, direct output error is pointed out, if it is, determine pointer affiliated area and preserve master calibration reading.
Further, described step D, comprising:
D1, calculate the interval angles θ 0 of adjacent two main scale marks, with pointer for original position, create arc measured zone with angle, θ 0；
D2, accurately this region list dial scale line and cursor line of extraction, described cursor line is the fine rule that pointer connects to this area coincidence part.Judge master calibration number of lines, if two, then pointer is in main scale mark position, directly output master calibration reading, if one, then pointer is between two main scale marks.
Further, described step E, comprising:
E1, the angle theta 1 calculated between pointer and main scale mark, with pointer for original position, create arc measured zone with angle, θ 1；
E2, accurately this region list dial scale line and cursor line of extraction, elaborate division by calculation scale number of lines, impose a condition and determine whether cursor line, without, then pointer overlaps with segmentation graduation mark, direct output pointer reading result=master calibration reading+dial plate scale division value × segmentation scale number of lines, if it has, elaborate division by calculation scale reading=dial plate scale division value × segmentation scale number of lines.
Further, comprising:
F1, the angle theta 2 calculated between pointer and arest neighbors segmentation graduation mark, with pointer for original position, create arc measured zone with angle, θ 2；
F2, accurately this region list dial scale line and cursor line of extraction, calculate cursor line to arest neighbors and segment the distance d between graduation mark and unit dial plate segmentation graduation mark distance D, cursor line position readings=d/D, output pointer reading result=master calibration reading+segmentation scale reading+cursor line position readings can be obtained.
The invention has the beneficial effects as follows: image processing algorithm principle of the present invention is simple, automatic recognition efficiency is high, and quick to time requirement consuming time harshness identifies that application scenario has applications well.Additionally, reading result is divided into three parts by the inventive method, calculating each several part reading size respectively according to the distance relation between graduation mark, the method precision is high, and robustness is good, and different scenes all can stably be accurately identified.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is the flow chart of steps of a kind of pointer pressure reading automatic identifying method；
Fig. 2 is pointer pressure pictorial diagram of the present invention；
Fig. 3 is pointer pressure dial plate cut zone of the present invention diagram；
Fig. 4 is pointer pressure graduation mark cut zone of the present invention diagram；
Fig. 5 is pointer pressure dial plate center of the present invention, main scale mark, pointer position, dial plate region segmentation diagram；
Fig. 6 is pointer pressure master calibration reading defining method of the present invention diagram；
Fig. 7 is pointer pressure of the present invention segmentation scale reading defining method diagram；
Fig. 8 is pointer pressure cursor line position readings defining method of the present invention diagram.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
As it is shown in figure 1, a kind of pointer pressure reading automatic identifying method, including: comprise the following steps:
A, gather Pressure gauge dial plate image by industrial camera, image is carried out pretreatment, strengthens picture contrast, reduce noise, improve later stage Pressure gauge and automatically identify accuracy；
B, contingency table disk area, position dial plate center, extracts dial scale line；
C, calculating dial plate master calibration reading；
D, judge pointer situation between graduation mark；
E, calculating dial plate segmentation scale reading；
F, computer chart index line position reading.
It is further used as preferred embodiment, described step B, comprising:
It is also carried out circumscribed circle matching by B1, extraction Pressure gauge dial plate border circular areas, calculates circumscribed circle home position and is dial plate center；
B2, establishment annulus measured zone, accurately extract dial scale line by image processing algorithm, and graduation mark is divided into main scale mark and segmentation graduation mark；
B3, location main scale mark center, it is connected with dial plate center, his-and-hers watches disk area is split, and each region is corresponding with master calibration reading.
It is further used as preferred embodiment, described step C, comprising:
C1, establishment annulus measured zone, pointer center in the annulus measured zone of location；
C2, judging whether pointer center is in reading area, if it is not, then show that pointer is in outside range ability, direct output error is pointed out, if it is, determine pointer affiliated area and preserve master calibration reading.
It is further used as preferred embodiment, described step D, comprising:
D1, calculate the interval angles θ 0 of adjacent two main scale marks, with pointer for original position, create arc measured zone with angle, θ 0；
D2, accurately this region list dial scale line and cursor line of extraction, described cursor line is the fine rule that pointer connects to this area coincidence part.Judge master calibration number of lines, if two, then pointer is in main scale mark position, directly output master calibration reading, if one, then pointer is between two main scale marks.Create arc measured zone and reduce measured zone further, be greatly reduced identification range, considerably increase the accuracy of measurement.
It is further used as preferred embodiment, described step E, comprising:
E1, the angle theta 1 calculated between pointer and main scale mark, with pointer for original position, create arc measured zone with angle, θ 1；
E2, accurately this region list dial scale line and cursor line of extraction, elaborate division by calculation scale number of lines, impose a condition and determine whether cursor line, without, then pointer overlaps with segmentation graduation mark, direct output pointer reading result=master calibration reading+dial plate scale division value × segmentation scale number of lines, if it has, elaborate division by calculation scale reading=dial plate scale division value × segmentation scale number of lines.
It is further used as preferred embodiment, comprising:
F1, the angle theta 2 calculated between pointer and arest neighbors segmentation graduation mark, with pointer for original position, create arc measured zone with angle, θ 2；
F2, accurately this region list dial scale line and cursor line of extraction, calculate cursor line to arest neighbors and segment the distance d between graduation mark and unit dial plate segmentation graduation mark distance D, can obtaining cursor line position readings=d/D, the present invention is described in further detail by output below in conjunction with Figure of description and specific embodiment.
Embodiment one
Identification process and the recognition result of a kind of pointer pressure reading automatic identifying method of the present invention are illustrated by the present embodiment.
Fig. 2 show pointer pressure pictorial diagram of the present invention, and manometric range ability is 0 ~ 0.1MPa, and unit main scale mark interval reading is 0.005MPa, and unit fine scale division line interval reading is 0.0005MPa, i.e. dial plate scale division value.
In order to accurately read this pressure gauge reading, the Pressure gauge dial plate image first industrial camera collected carries out pretreatment, strengthens picture contrast, reduces picture noise interference.
Utilize image processing algorithm, disc area is split, it is illustrated in figure 3 pointer pressure dial plate cut zone of the present invention diagram, individually this region is processed, it is possible to reduce image data amount, improve programmed algorithm operational efficiency, circular dial plate is carried out circumscribed circle matching, calculating obtains circumradius value and is sized to R0, and circumscribed circle center C coordinate is (row, column).
Centered by C, create annulus measured zone, dial scale line region is split, be illustrated in figure 4 pointer pressure graduation mark cut zone of the present invention diagram.Utilizing image processing algorithm, position main scale mark center, and be attached in itself and dial plate center, dial plate is divided into zones of different, each region is corresponding with a master calibration number, if pointer exceedes range, programmed algorithm output error is pointed out.Centered by C, create annulus measured zone, hand of dial region is split, utilizes image processing algorithm, positioning pointer center.It is illustrated in figure 5 pointer pressure dial plate center of the present invention, main scale mark, pointer position, dial plate region segmentation diagram.Hand of dial center is in [0.065MPa, 0.070MPa] region.
Calculate the interval angles θ 0 of adjacent two main scale marks, for improving certainty of measurement, increase a minor shifts amount δ 0, with pointer midpoint for original position, create arc measured zone with angle, θ 0+ δ 0；Accurately extract this region list dial scale line, it is judged that master calibration number of lines.It is illustrated in figure 6 pointer pressure master calibration reading defining method of the present invention diagram.Wherein master calibration number of lines is one, then pointer is between two main scale marks, now master calibration reading X1=0.065MPa.
Calculate the angle theta 1 between pointer and main scale mark, for improving certainty of measurement, increase a minor shifts amount δ 1, with pointer for original position, create arc measured zone with angle, θ 1+ δ 1.Accurately extract this region list dial scale line, elaborate division by calculation scale number of lines, it is judged that with or without cursor line.Fig. 7 is pointer pressure of the present invention segmentation scale reading defining method diagram, wherein has cursor line, and segmentation scale number of lines is four, then segmentation scale reading X2=dial plate scale division value × segmentation scale number of lines, i.e. X2=0.0005 × 4=0.002MPa.
Calculate the angle theta 2 between pointer and arest neighbors segmentation graduation mark, for improving certainty of measurement, increase a minor shifts amount δ 2, with pointer for original position, create arc measured zone with angle, θ 2+ δ 2.Fig. 8 show pointer pressure cursor line position readings defining method of the present invention diagram, accurately extract this region list dial scale line, calculate cursor line and segment the unit distance D=8.78961 (pixel) between distance d=5.15937 (pixel) and the adjacent segmentation graduation mark between graduation mark to arest neighbors, cursor line position readings X3=5.15937/8.78961 × 0.0005=0.000293MPa can be obtained.Therefore, the final reading X=X1+X2+X3=0.065+0.002+0.000293=0.067293MPa of pointer.
Therefore, compared with prior art, the invention have the advantages that
(1) image processing algorithm principle of the present invention is simple, and automatic recognition efficiency is high, and quick to time requirement consuming time harshness identifies that application scenario has applications well.
(2) reading result is divided into three parts by the inventive method, calculates each several part reading size respectively according to the distance relation between graduation mark, and the method precision is high, and error is less than 0.01%, and robustness is good, and photographed scene dependency is less.
It is above the preferably enforcement of the present invention has been illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the premise without prejudice to spirit of the present invention, and these equivalent deformation or replacement are all contained in the application claim limited range.
Claims (6)
1. a pointer pressure reading automatic identifying method,
It is characterized in that: comprise the following steps:
A, gather Pressure gauge dial plate image by industrial camera, image is carried out pretreatment, strengthens picture contrast, reduce noise, improve later stage Pressure gauge and automatically identify accuracy；
B, contingency table disk area, position dial plate center, extracts dial scale line；
C, calculating dial plate master calibration reading；
D, judge pointer situation between graduation mark；
E, calculating dial plate segmentation scale reading；
F, computer chart index line position reading.
2. a kind of pointer pressure reading automatic identifying method according to claim 1, it is characterised in that described step B, comprising:
It is also carried out circumscribed circle matching by B1, extraction Pressure gauge dial plate border circular areas, calculates circumscribed circle home position and is dial plate center；
B2, establishment annulus measured zone, accurately extract dial scale line by image processing algorithm, and graduation mark is divided into main scale mark and segmentation graduation mark；
B3, location main scale mark center, it is connected with dial plate center, his-and-hers watches disk area is split, and each region is corresponding with master calibration reading.
3. a kind of pointer pressure reading automatic identifying method according to claim 1, it is characterised in that described step C, comprising:
C1, establishment annulus measured zone, pointer center in the annulus measured zone of location；
C2, judging whether pointer center is in reading area, if it is not, then show that pointer is in outside range ability, direct output error is pointed out, if it is, determine pointer affiliated area and preserve master calibration reading.
4. a kind of pointer pressure reading automatic identifying method according to claim 1, it is characterised in that described step D, comprising:
D1, calculate the interval angles θ 0 of adjacent two main scale marks, with pointer for original position, create arc measured zone with angle, θ 0；
D2, accurately this region list dial scale line and cursor line of extraction, described cursor line is the fine rule that pointer connects to this area coincidence part.Judge master calibration number of lines, if two, then pointer is in main scale mark position, directly output master calibration reading, if one, then pointer is between two main scale marks.
5. a kind of pointer pressure reading automatic identifying method according to claim 1, it is characterised in that described step E, comprising:
E1, the angle theta 1 calculated between pointer and main scale mark, with pointer for original position, create arc measured zone with angle, θ 1；
E2, accurately this region list dial scale line and cursor line of extraction, elaborate division by calculation scale number of lines, impose a condition and determine whether cursor line, without, then pointer overlaps with segmentation graduation mark, direct output pointer reading result=master calibration reading+dial plate scale division value × segmentation scale number of lines, if it has, elaborate division by calculation scale reading=dial plate scale division value × segmentation scale number of lines.
6. a kind of pointer pressure reading automatic identifying method according to claim 1, it is characterised in that described step F, comprising:
F1, the angle theta 2 calculated between pointer and arest neighbors segmentation graduation mark, with pointer for original position, create arc measured zone with angle, θ 2；
F2, accurately this region list dial scale line and cursor line of extraction, calculate cursor line to arest neighbors and segment the distance d between graduation mark and unit dial plate segmentation graduation mark distance D, cursor line position readings=d/D, output pointer reading result=master calibration reading+segmentation scale reading+cursor line position readings can be obtained.
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| CN201610120575.6A CN105741307A (en) | 2016-03-03 | 2016-03-03 | Method for automatically identifying reading of pointer type pressure meter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106153238A (en) * | 2016-09-18 | 2016-11-23 | 北京斯贝克科技有限责任公司 | The manufacture method of a kind of non-regulating pointer pressure and product |
| CN108827530A (en) * | 2018-03-13 | 2018-11-16 | 安徽瑞鑫自动化仪表有限公司 | A kind of pressure gauge remote data automation acquisition system |
| CN109341933A (en) * | 2018-09-29 | 2019-02-15 | 广东电网有限责任公司 | On-line monitoring method, the apparatus and system of pressure value |
| CN109543682A (en) * | 2018-11-23 | 2019-03-29 | 电子科技大学 | A kind of readings of pointer type meters method based on deep learning |
| CN109993166A (en) * | 2019-04-03 | 2019-07-09 | 同济大学 | The readings of pointer type meters automatic identifying method searched based on scale |
| CN111325164A (en) * | 2020-02-25 | 2020-06-23 | 北京眸视科技有限公司 | Pointer indication number identification method and device and electronic equipment |
| CN112115896A (en) * | 2020-09-24 | 2020-12-22 | 深圳市赛为智能股份有限公司 | Instrument panel pointer reading prediction method and device, computer equipment and storage medium |
| CN113469162A (en) * | 2021-06-02 | 2021-10-01 | 广东白云学院 | Pointer instrument reading method, device, equipment and medium based on double-scale segmentation |
| CN113566863A (en) * | 2021-06-11 | 2021-10-29 | 北京眸视科技有限公司 | Reading method and device of pointer table |
| CN115222817A (en) * | 2022-08-31 | 2022-10-21 | 成都千嘉科技股份有限公司 | Pointer positioning method of pointer type pressure gauge |
| CN115655576A (en) * | 2022-12-13 | 2023-01-31 | 成都千嘉科技股份有限公司 | Automatic sensing method for displacement abnormity of pointer type pressure gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153238A (en) * | 2016-09-18 | 2016-11-23 | 北京斯贝克科技有限责任公司 | The manufacture method of a kind of non-regulating pointer pressure and product |
| CN108827530A (en) * | 2018-03-13 | 2018-11-16 | 安徽瑞鑫自动化仪表有限公司 | A kind of pressure gauge remote data automation acquisition system |
| CN109341933A (en) * | 2018-09-29 | 2019-02-15 | 广东电网有限责任公司 | On-line monitoring method, the apparatus and system of pressure value |
| CN109543682A (en) * | 2018-11-23 | 2019-03-29 | 电子科技大学 | A kind of readings of pointer type meters method based on deep learning |
| CN109993166A (en) * | 2019-04-03 | 2019-07-09 | 同济大学 | The readings of pointer type meters automatic identifying method searched based on scale |
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| CN112115896A (en) * | 2020-09-24 | 2020-12-22 | 深圳市赛为智能股份有限公司 | Instrument panel pointer reading prediction method and device, computer equipment and storage medium |
| CN112115896B (en) * | 2020-09-24 | 2023-12-22 | 深圳市赛为智能股份有限公司 | Instrument panel pointer reading prediction method and device, computer equipment and storage medium |
| CN113469162B (en) * | 2021-06-02 | 2023-09-26 | 广东白云学院 | Pointer instrument identification method, device, equipment and medium based on double-scale segmentation |
| CN113469162A (en) * | 2021-06-02 | 2021-10-01 | 广东白云学院 | Pointer instrument reading method, device, equipment and medium based on double-scale segmentation |
| CN113566863A (en) * | 2021-06-11 | 2021-10-29 | 北京眸视科技有限公司 | Reading method and device of pointer table |
| CN113566863B (en) * | 2021-06-11 | 2023-12-26 | 北京眸视科技有限公司 | Pointer table reading method and device |
| CN115222817B (en) * | 2022-08-31 | 2022-11-29 | 成都千嘉科技股份有限公司 | Pointer positioning method of pointer type pressure gauge |
| CN115222817A (en) * | 2022-08-31 | 2022-10-21 | 成都千嘉科技股份有限公司 | Pointer positioning method of pointer type pressure gauge |
| CN115655576B (en) * | 2022-12-13 | 2023-03-10 | 成都千嘉科技股份有限公司 | Automatic sensing method for displacement abnormity of pointer type pressure gauge |
| CN115655576A (en) * | 2022-12-13 | 2023-01-31 | 成都千嘉科技股份有限公司 | Automatic sensing method for displacement abnormity of pointer type pressure gauge |
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