CN101075288A - Method for straighted-reading image in character bar-code metering indication wheel - Google Patents
Method for straighted-reading image in character bar-code metering indication wheel Download PDFInfo
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- CN101075288A CN101075288A CN 200710021906 CN200710021906A CN101075288A CN 101075288 A CN101075288 A CN 101075288A CN 200710021906 CN200710021906 CN 200710021906 CN 200710021906 A CN200710021906 A CN 200710021906A CN 101075288 A CN101075288 A CN 101075288A
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Abstract
An image directly reading method of character bar code metering indication wheel includes receiving and outputting the reading image of video camera head, analyzing direction angle of reading image and obtaining character region and bar code region of each digit by utilizing image dividing means, fetching scan line in vertical to direction angle and in passing bar code region through to analyze and obtain character code of said digit image then comparing said character code with standard code book for obtaining the reading value of said digit.
Description
Technical field the present invention relates to instrumented data remote auto acquisition technique field, particularly relates to the image direct-read method of a kind of character barcode computation indicated character wheel that can be used for remote automatic meter reading system.
Background technology has experienced after pulse teletransmission and the Ka Biao technology, and the remote data automatic acquisition technology of present gauging tables such as water, electricity, gas develops into " direct-reading " stage.As its name suggests, the direct-reading teletransmission is exactly that indicating value to gauging table directly reads, stores and with data remote.Existing direct-reading technology mainly contains coded directly reading type or claims the code-disc direct read formula and shooting direct-reading two classes.
The essence of coding direct-reading technology is a kind of recognition technology of mechanical location, by perforate or additional electrical components or printing mark on the counter of gauge table, utilize sensor built-in or that be installed in the periphery to carry out position probing, form the current location of the different incompatible judgement counters of code set.Concrete implementation method has many kinds, as optoelectronic transceiver formula, resistance logic formula, contact-making switch formula, photoelectricity transmission-type etc.This class technology has had a large amount of application and practice at present, major defect is: need his-and-hers watches tool itself to carry out various transformations, problems such as inaccurate or reading of the metering that exists variety of issue such as because of reading blind spot, carry inaccurate, aging or wearing and tearing to cause in addition and displayed value are not inconsistent usually can't be collected evidence when causing dispute.Some also has the application restriction in these technology, for example can not be used for wet-type meter, can cause disaster hidden-trouble and install electronic installation additional in gas meter.Thereby, develop and shooting direct-reading technology.
The small-sized image pickup head that the utilization of shooting direct-reading technology is installed on the gauge table code-disc or holds is outward taken the picture of following table tool indicating value, obtains reading by image recognition technology again.Also not at the real system of the direct carries out image interpretation of table end, present various implementations all are image to be sent to focus on to hold carry out interpretation now.Shooting direct-reading technology has many good qualities: the life-span is long, need not switch at ordinary times, does not generally need to do in the his-and-hers watches tool any change, and various dry type wet-type meters and ammeter, gas meter can be used; Under adding user profile, table tool code name on the image and preserving after the meter reading time, but acquire full legal force also.Shooting direct-reading teletransmission technology has been put into Ministry of Construction's industry standard.But also there are some shortcomings in this class technology at present, topmost still image recognition accuracy problem and realization cost problem.
ZL 03113051.8 has proposed a kind of remote collection of wheel type counter counting, the method and the device of transmission, on counter wheel, be provided with the strip or the trellis structure font code of difference different digital, by imageing sensor and signal processing technology discriminating digit, and provided the method for discerning the one-dimensional bar code reading.The advantage of this recognizer is simple realization easily, and weak point is: 1, as image inclination meeting readout error data are arranged.2, only with graphic code difference numeral, the ordinary people is difficult to identification, and the professional also misreads easily, though also point out to mark separately the arabic numeral of paler colour in its open file on counter wheel, but actual effect not only will increase the noise of image recognition, and artificial recognition is also unintelligible.3, just there is situation about not reading whatever in transversal scanning when numeral is the character transition, different readings may occur again if get the multirow data interpretation, otherwise algorithm will complicate; Or as two-dimentional trellis sign indicating number when digital transition, can produce serious ambiguity (for example its 2-3 and 5-6 transition are all identical with 0 symbol, 3-4 and 9-0 transition all identical) with 2 symbol.
The deficiency that summary of the invention exists at existing gauging table image direct-read technology, the present invention seeks to: the image direct-read method that proposes a kind of character barcode computation indicated character wheel, this method is on the basis that does not change existing gauging table structure and metering reading method, obtain correct reading by the identification bar code, figure/number conversion discrimination problem when solving automatic data logging, a difficult problem distinguished in imperfect character etc. when solving the character transition simultaneously.In addition this method according to bar code the initial or position of end in image, not only can judge the correct digit that this numerical digit should be read, can also calculate continuous data than higher one or two order of magnitude precision of lowest-order digit.
Technical scheme of the present invention is: a kind of image direct-read method of character barcode computation indicated character wheel, comprise the reading image and the output readings that receive camera, and particularly: the image recognition flow process that matches with the character barcode character wheel is:
Energized is obtained the reading image of table tool and is sent into graphics processing unit by camera;
The analysis image intensity profile draws and writes down the orientation angle θ of reading picture;
Image segmentation obtains the character zone and the bar code zone of each numerical digit of reading, wherein character zone comprises character, the bar code zone comprises the interval between the reference position of the end position of bar code and last bar code and back one bar code, with character zone and bar code zone as region-of-interest and write down its feature locations;
Image recognition is carried out in bar code zone to each numerical digit, adopt vertical mode that the bar code zone is scanned, read perpendicular to orientation angle θ and pass the sweep trace in bar code zone, gray scale undulating quantity on the analysis scan line or the value after the binaryzation also obtain the feature coding of this numerical digit image, itself and standard code book are contrasted, obtain the complete character of this numerical digit or the reading value of transition character;
Described standard code book is that continuous form is a long coded strings, adds as the list separator of the 3rd value to the pairing two-value bar code of 0 character by from 0 to 9 again and forms;
When not having the character transition, reading value is this character; When the character transition occurring, reading value is two adjacent characters, extrapolate the relative position of this place reading picture according to the reference position of the end position of last character or back one character, relative position and normal place are compared, if relative position is under normal place, then read off is last character, otherwise read off is back one character, reading with the every character representative of gained is combined into a complete metering reading by rule at last, finishes figure/number conversion.
As a further improvement of existing technologies: by from 0 to 9 again to the pairing two-value bar code of 0 character, wherein two-value is " 0 ", " 1 "; List separator as the 3rd value adopts " 2 " or other to be different from the used value or the symbol of bar code arbitrarily, and list separator " 2 " is the pairing value in interval between two adjacent bar codes in the bar code zone; The character that character zone comprises is numeral or mark; The feature coding of the complete character of this numerical digit or transition character adopts block code or non-block code; According to a graded, make up the recognition result of each numerical digit, wherein a graded is from a high position to the low level or from the low level to a high position; Adopting vertical mode that the bar code zone is scanned, wherein vertically is the direction that parallels with code wheel rotation direction in the watch window.
Remote collection, the method for transmission and the weak point of device of a kind of wheel type counter counting of beneficial effect: prior art ZL 03113051.8 are: image has the inclination may the readout error data, only with graphic code difference numeral, is difficult for artificial recognition.Transversal scanning is read less than data conditions with regard to existing during the character transition, different readings may occur again if get the multirow data interpretation, otherwise algorithm will complicate; Can produce serious ambiguity as two-dimentional trellis sign indicating number when the digital transition.With respect to prior art weak point, the invention has the beneficial effects as follows:
One, the image direct-read method of character barcode computation indicated character wheel at first carries out image recognition to the bar code zone of each numerical digit, adopt vertical mode that the bar code zone is scanned, read perpendicular to orientation angle θ and pass the sweep trace in bar code zone, gray scale undulating quantity on the analysis scan line or the value after the binaryzation also obtain the feature coding of this numerical digit image, itself and standard code book are contrasted, obtain the complete character of this numerical digit or the reading value of transition character.Therefore this method is not subjected to the restriction of the direction of image display frame, no matter picture is level or that tilt or even perpendicular with normal situation or puts upside down and all can obtain correct feature coding and corresponding reading value.This scheme can realize 100% correct recognition rata of figure/number conversion, and this scheme both had been suitable for realizing with the form of hard-wired meter reading device or meter reading system, also was suitable for realizing with the form that hand-held meter reading machine or other on-fixed are installed.
Its two, the present invention at first obtains the character zone and the bar code zone of each numerical digit with image partition method, respectively the bar code zone of each numerical digit correspondence is discerned then, at last according to graded combination recognition result.When the bar code zone is discerned, adopt vertical mode that the bar code zone is scanned, obtain feature coding.Because this kind longitudinal scanning mode scans the 3rd value that the feature coding that obtains comprises the interval correspondence of the two-value of bar code correspondence in the bar code zone and adjacent strip intersymbol, so code wheel will obtain different feature codings when being in diverse location and scanning reading.
The standard code book is that continuous form is a long coded strings, by from 0 to 9 again to 0 character the two-value bar code of corresponding " 0 ", " 1 " add as the list separator " 2 " of the 3rd value and form that list separator is the pairing value in interval between two adjacent bar codes in the barcode size or text field.Feature coding and standard code book relatively will be obtained reading value.When not having the character transition, reading value is this character; When the character transition occurring, reading value is two adjacent characters, utilizes the comparison of relative position and normal place, judges that reading value is still back one character of last character.
In this recognition methods, utilize the interval of bar code and adjacent bar intersymbol to participate in the position relation of character in watch window on coding and the code wheel, can both accurately discern at the character that diverse location shows code wheel, solved transition state character recognition difficult point well, transversal scanning exists and to read the situation that different readings, two-dimentional trellis sign indicating number produce serious ambiguity when the digital transition may occur less than data conditions, multirow data interpretation when having solved character transition in the prior art.
Description of drawings
Fig. 1 is the rotational structure synoptic diagram of character barcode computation indicated character wheel.
Fig. 2 is character zone and bar code zone key diagram a and b.
Fig. 3 is the code wheel stretch-out view of character barcode computation indicated character wheel.
Fig. 4 is the reading image and the watch window one of character barcode computation indicated character wheel.
Fig. 5 is the reading image and the watch window two of character barcode computation indicated character wheel.
Fig. 6 is complete character coding of the present invention and transition character code synoptic diagram.
Fig. 7 is a kind of image direct-read method synoptic diagram of character barcode computation indicated character wheel.
Embodiment is further explained embodiments of the invention below in conjunction with accompanying drawing:
Fig. 1 is the rotational structure synoptic diagram of character barcode computation indicated character wheel.In Fig. 1, the circumferential surface of character barcode computation indicated character wheel is printed with the character 1 and the bar code 2 of the computation indicated character symbol 0～9 of two kinds of parallel arranged.Wherein the stripe direction of bar code 2 is a level, promptly is parallel to the rotation axis of character wheel, perpendicular to character wheel edge circumference.Character 1 has kept the artificial legibility of former gauging table, the simplicity and the correctness of figure/number conversion when 2 of bar codes are used for guaranteeing image direct-read.The sense of rotation of character barcode computation indicated character wheel is to rotate in the direction of the clock.
Fig. 2 is character zone and bar code zone key diagram a and b.Wherein, in Fig. 2 a, 3 is character zone, and 4 is the bar code zone, and 5 is sweep trace, and the vertically middle separated time in the bar code zone 4 that sweep trace 5 comprises comprises any sweep trace 5 through bar code zone 4 simultaneously.In Fig. 2 b, 6 is relative position, 7 is normal place, 8 is the end position of last bar code 2,9 is the reference position of back one bar code 2, and θ is the orientation angle of reading picture, and the image direct-read method of character barcode computation indicated character wheel is the orientation angle θ of assay readings picture at first, and then read perpendicular to orientation angle θ and pass the sweep trace 5 in bar code zone 4, analyze the feature coding that obtains this numerical digit image.
Fig. 3 is the code wheel stretch-out view of character barcode computation indicated character wheel.In Fig. 3, the two-value bar code 2 that character 1 usefulness is different is represented character 0～9, and do not need initial symbol and full stop, its corresponding bar code 2 is respectively: 00110,10001,01001,11000,00101,10100,01100,00011,10010,01010.
Fig. 4 is the reading image and the watch window one of character barcode computation indicated character wheel.In Fig. 4, housing is represented whole reading image, and inside casing is represented the wherein watch window of reading.Character 1, bar code 2 and bar code zone 4 are arranged in the watch window of character barcode computation indicated character wheel, and its feature locations is respectively P
1, P
2, P
3, P
4, P
5, P among the figure
5Be the position at sweep trace 5 places in this numerical digit image bar code zone 4, P
1, P
2, P
3, P
4And P
5Explain similar.
Fig. 5 is the reading image and the watch window two of character barcode computation indicated character wheel.In Fig. 5, the angle of the watch window of character barcode computation indicated character wheel and image level direction is θ.
Fig. 6 is complete character coding of the present invention and transition character code synoptic diagram.In Fig. 6, the part of the accurate code book conitnuous forms of long number ring table indicating, 10a is the feature coding of complete character, 10b
1, 10b
2Be the feature coding of transition character, complete character 10a or transition character 10b
1, 10b
2Feature coding adopt block code or non-block code.
Fig. 7 is a kind of image direct-read method synoptic diagram of character barcode computation indicated character wheel.The image recognition flow process is in Fig. 7: beginning (step 100), will discern (step 101) successively to each region-of-interest; Feature locations Pi is by reading sweep trace 5 (step 102) perpendicular to deflection θ from image, sweep trace 5 is carried out binary conversion treatment (step 103) so that post analysis is handled with the adaptive threshold method, width information according to sweep trace 5 trip segment is translated into three value tags codings (step 104), feature coding and standard code book are relatively obtained reading value (step 105), is there character 1 transition? (step 106), if not, reading value is a single character 1 (step 107), directly enters the character that identifies 1 is write down (step 114) as this place reading again; If, reading value is two adjacent characters 1 (step 108), in the character zone 3 of this numerical digit, find the up-and-down boundary position (step 109) of adjacent character 1 then, calculate the relative position 6 (step 110) of this numerical digit reading picture according to the end position and the reference position of back one character 1 of last character 1; Do you judge that relative position 6 is under pre-determined normal place 7? (step 111), if, then read off is the last character 1 (step 112) in the two adjacent characters 1, if not, then read off is the back character 1 (step 113) in the two adjacent characters 1, and the character that identifies 1 is write down (step 114) as this place reading; After each numerical digit identification is finished, each numerical digit reading is combined into a complete metering reading (step 115), finally finishes figure/number conversion (step 116) by certain rule.
Embodiment one: use on the water meter.Character wheel adopts the character barcode computation indicated character wheel of aforementioned embodiments.Video camera and single-chip microcomputer image processing system are fixedly installed on the water meter.Use Fig. 7 implements.
Embodiment two: use on the gas meter.Character wheel adopts the character barcode computation indicated character wheel of aforementioned embodiments.Video camera and single-chip microcomputer image processing system are hand-held meter reading machines that is independent of gas meter.Use Fig. 7 implements.
Embodiment three: use on the ammeter.Character wheel adopts the character barcode computation indicated character wheel of aforementioned embodiments.Video camera and single-chip microcomputer image processing system are hand-held meter reading machines that is independent of gas meter.Use Fig. 7 implements.
Obviously, those skilled in the art can carry out various changes and modification to the image direct-read method of character barcode computation indicated character wheel of the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1, a kind of image direct-read method of character barcode computation indicated character wheel comprises the reading image and the output readings that receive camera, and it is characterized in that: the image recognition flow process that matches with the character barcode character wheel is:
Energized is obtained the reading image of table tool and is sent into graphics processing unit by camera;
The analysis image intensity profile draws and writes down the orientation angle θ of reading picture;
Image segmentation obtains character zone (3) and bar code zone (4) of each numerical digit of reading, wherein character zone (3) comprises character (1), bar code zone (4) comprises the interval between the reference position (9) of the end position (8) of bar code (2) and last bar code (2) and back one bar code (2), with character zone (3) and bar code zone (4) as region-of-interest and write down its feature locations;
Image recognition is carried out in bar code zone (4) to each numerical digit, adopt vertical mode that bar code zone (4) are scanned, read perpendicular to orientation angle θ and pass the sweep trace (5) of bar code zone (4), gray scale undulating quantity on the analysis scan line (5) or the value after the binaryzation also obtain the feature coding of this numerical digit image, itself and standard code book are contrasted, obtain the complete character (10a) or the transition character (10b of this numerical digit
1, 10b
2) reading value;
Described standard code book is that continuous form is a long coded strings, adds as the list separator of the 3rd value to the pairing two-value bar code of 0 character (2) by from 0 to 9 again and forms;
When not having the character transition, reading value is this character; When character (1) transition occurring, reading value is two adjacent characters (1), extrapolate the relative position (6) of this place reading picture according to the reference position (9) of the end position (8) of last character (1) and back one character (1), relative position (6) and normal place (7) are compared, if relative position (6) is under normal place (7), then read off is last character (1), otherwise read off is back one character (1), reading with the every character of gained (1) representative is combined into a complete metering reading by rule at last, finishes figure/number conversion.
2, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1 is characterized in that: said by from 0 to 9 again to the pairing two-value bar code of 0 character, wherein two-value is " 0 ", " 1 ".
3, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1, it is characterized in that: said list separator as the 3rd value adopts " 2 " or other to be different from the used value or the symbol of bar code (2) arbitrarily, and list separator " 2 " is the pairing value in interval between two adjacent bar codes (2) in the bar code zone (4).
4, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1 is characterized in that: the character (1) that said character zone (3) comprises is numeral or mark.
5, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1 is characterized in that: complete character of said this numerical digit (10a) or transition character (10b
1, 10b
2) feature coding adopt block code or non-block code.
6, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1 is characterized in that: said according to a graded, make up the recognition result of each numerical digit, and wherein a graded is from a high position to the low level or from the low level to a high position.
7, the image direct-read method of a kind of character barcode computation indicated character wheel according to claim 1 is characterized in that: adopting vertical mode that bar code zone (4) are scanned, wherein vertically is the direction that parallels with code wheel rotation direction in the watch window.
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| CN 200710021906 CN101075288A (en) | 2007-04-30 | 2007-04-30 | Method for straighted-reading image in character bar-code metering indication wheel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236788A (en) * | 2010-04-20 | 2011-11-09 | 荣科科技股份有限公司 | Kilowatt-hour meter image automatic identification method |
| CN102279922A (en) * | 2010-06-12 | 2011-12-14 | 晨星软件研发(深圳)有限公司 | Bar code image recognition system applied to handheld device and relevant method |
| CN102298134A (en) * | 2010-06-23 | 2011-12-28 | 荣科科技股份有限公司 | Batch detection method and device for withdrawn electric energy meters |
| CN103471630A (en) * | 2012-06-07 | 2013-12-25 | 杨明恭 | Remote meter reading identification system and identification method thereof |
| CN105844317A (en) * | 2016-04-26 | 2016-08-10 | 洛阳愿景科技有限公司 | Color coding digital coded disc |
| CN112464932A (en) * | 2020-11-26 | 2021-03-09 | 广东工业大学 | Water meter numerical value automatic reading method and device, electronic equipment and storage medium |
| CN114445784A (en) * | 2022-03-01 | 2022-05-06 | 武汉聚智惠仁信息技术有限公司 | Method and system for acquiring CRRT screen parameters in real time |
| CN117387713A (en) * | 2023-12-08 | 2024-01-12 | 济南瑞泉电子有限公司 | Metering instrument angular position coding structure, data acquisition device, metering instrument and metering instrument method |
-
2007
- 2007-04-30 CN CN 200710021906 patent/CN101075288A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236788A (en) * | 2010-04-20 | 2011-11-09 | 荣科科技股份有限公司 | Kilowatt-hour meter image automatic identification method |
| CN102236788B (en) * | 2010-04-20 | 2015-09-02 | 荣科科技股份有限公司 | Power meter automatic distinguishing method for image |
| CN102279922A (en) * | 2010-06-12 | 2011-12-14 | 晨星软件研发(深圳)有限公司 | Bar code image recognition system applied to handheld device and relevant method |
| CN102279922B (en) * | 2010-06-12 | 2014-07-16 | 晨星软件研发(深圳)有限公司 | Bar code image recognition system applied to handheld device and relevant method |
| CN102298134A (en) * | 2010-06-23 | 2011-12-28 | 荣科科技股份有限公司 | Batch detection method and device for withdrawn electric energy meters |
| CN103471630A (en) * | 2012-06-07 | 2013-12-25 | 杨明恭 | Remote meter reading identification system and identification method thereof |
| CN105844317A (en) * | 2016-04-26 | 2016-08-10 | 洛阳愿景科技有限公司 | Color coding digital coded disc |
| CN112464932A (en) * | 2020-11-26 | 2021-03-09 | 广东工业大学 | Water meter numerical value automatic reading method and device, electronic equipment and storage medium |
| CN114445784A (en) * | 2022-03-01 | 2022-05-06 | 武汉聚智惠仁信息技术有限公司 | Method and system for acquiring CRRT screen parameters in real time |
| CN114445784B (en) * | 2022-03-01 | 2023-01-10 | 武汉聚智惠仁信息技术有限公司 | Method and system for acquiring CRRT screen parameters in real time |
| CN117387713A (en) * | 2023-12-08 | 2024-01-12 | 济南瑞泉电子有限公司 | Metering instrument angular position coding structure, data acquisition device, metering instrument and metering instrument method |
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