CN103226706A - Rolling matching-based method for automatically identifying readings of water, electricity and gas meters - Google Patents

Abstract

The invention discloses a rolling matching-based method for automatically identifying readings of water, electricity and gas meters. The method comprises the steps that a camera acquires real-time charging data pictures of the water, electricity and gas meters regularly and transmits the real-time charging data pictures to a singlechip system through a data line; the singlechip system carries out image binaryzation, charging digital block location, noise filtration, character segmentation and half-character judgment on the acquired charging data pictures to obtain segmented full-character and half-character pictures; a character spacing between upper and lower half-characters of an image to be identified; a template belt is connected according to the character spacing of the image to be identified; rolling and left-right moving of the template belt are combined for carrying out character matching; a character matching rate at a corresponding position is calculated; a maximum value is selected through matching the matching rates; and a template character corresponding to the maximum value is determined, an identification digital result is sequentially output from left to right according to the corresponding dial reading pictures and thus charging readings of the water, electricity and gas meters are obtained. The invention provides a method which is accurate in counting, is time and labor-saving, and is capable of obtaining the data of the water, electricity and gas meters duly.

Description

A kind of water, electricity and gas meter reading automatic identifying method based on the coupling of rolling

Technical field

The present invention relates to data identification, particularly relate to a kind of water, electricity and gas meter reading automatic identifying method, belong to automation instrument and digital image processing field based on the coupling of rolling.

Background technology

At present, checking meter of the electric table of domestic use of water except ammeter, still is manual metering basically, and be especially all the more so for old-fashioned water meter.Manual metering needs the staff to enter every household, checks the aqueous vapor ammeter, record data, and the input computing machine, computational costs reinforms subscriber payment; This method wastes time and energy, and labour intensity is big, the labour cost height, and, be difficult to guarantee to obtain the aqueous vapor ammeter data because resident family stays out on time.

By the digit recognition technology, accurately obtain water power gas meter data automatically on time, avoid the problems of manual metering to become the technical matters that presses for solution.But the template matches technology of present template can't be carried out correct identification by double character, and water power gas meter dial plate reading is all rolling at any time, the probability of the half-word symbol that occurs is very high, the dial plate reading is from left to right counted, and general units is a tens on the right from right to left successively, hundred figure places, thousands digits etc. if can not accurately read at water power gas meter dial plate reading, will directly influence the application of digit recognition technology at water power gas meter counting.

Summary of the invention

The objective of the invention is to overcome the problem of prior art manual metering, provide a kind of counting accurate, time saving and energy saving, can obtain the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling of water power gas meter data on time.

The object of the invention realizes by following technical elements:

A kind of water, electricity and gas meter reading automatic identifying method based on the coupling of rolling may further comprise the steps:

(1) the real time billing data picture of camera timing acquiring water power gas meter is sent to Single Chip Microcomputer (SCM) system by data line;

(2) Single Chip Microcomputer (SCM) system is carried out image binaryzation, location, charging digital block, noise filtering, Character segmentation and the judgement of half-word symbol to the metering data photo of gathering, full word symbol after obtaining cutting apart and half-word symbol photo;

(3) full word symbol to be identified and half-word symbol photo are normalized to the template character boundary, and prospect is preserved between two parties; Described prospect is the character stroke zone, and pixel is represented with 1 in the prospect, and non-character stroke zone is a background, and pixel is represented with 0 in the background;

(4) for the symbol of the half-word after normalization photo, calculate half-word symbol photo to be identified two middle line-spacings of half-word symbol up and down, copy the form of the data tape in the water power gas meter, according to the character pitch of end to end order of adjacent character and character picture to be identified, ten template character matrixs of 0-9 are vertically connected into the annular die strip;

(5) from first template character 0, be the unit annular die strip that scrolls up with a pixel, the character in the corresponding ring-type Form board tape position and input character image are carried out matching rate calculate; Whenever after the annular die strip that once scrolls up, 0-K location of pixels of move left and right character to be identified or half-word symbol image respectively calculates the character in the corresponding templates band position and the matching rate of input character image after each move left and right; The ring-type of rolling again Form board tape is got back to template character 0 position again up to the annular die strip; The value of described integer K is determined according to template dot matrix size, less than the template width; Matching rate C=α * (the count non-zero pixels of M/ Character mother plate of pixel that overlaps of character to be identified or half-word symbol prospect and template is counted)+(1-α) * (character to be identified or half-word accord with prospect and template overlap count non-0 pixel number of M/ input picture of pixel); α is an empirical value; The coincidence number M of pixel for whenever once move up or move left and right after, the data of character to be identified or half-word symbol image lattice and character scroll template correspondence position dot matrix are multiplied each other, and with this result of product income value that adds up;

(6) with the each matching rate result of Dynamic Array record; By relatively, select the result of matching rate maximum, determine the pairing template position of maximum result, with the template character that this determines and the input character image mates most; For full word symbol output annular die strip corresponding characters; For half-word symbol, serve as the output result with the corresponding numeral of upper semisection half-word symbol of annular die strip corresponding region;

(7) for full word symbol to be identified that has been partitioned into and half-word symbol digital picture, from left to right export the discriminating digit result successively, obtain the charging reading of water power gas meter according to the dial plate reading picture of correspondence.

Further, location, described charging digital block is dial plate reading position in the specific bit metering data photo.Described noise filtering comprises filtering Gaussian noise, salt-pepper noise and other noise.Described Character segmentation is that dial plate reading in the metering data photo behind the noise filtering is become isolated character by column split.Described half-word symbol be meant in the metering data photo can not complete demonstration character, character is the arabic numeral of 0-9.Described template character is meant the fall into a trap computer representation of the pixel-matrix picture of the used font of 0-9 in the expense reading numeric area of water power gas meter to be identified.Described data tape is meant the water power gas meter order that 0-9 shows in the expense reading numeric area of falling into a trap.Described move left and right is meant that treating identification character or half-word symbol image is moved to the left 0-K location of pixels, so that mate calculating; Return the position before being moved to the left, and then treat identification character or half-word symbol image 0-K the location of pixels that move right, so that mate calculating.Described timing is according to January one or many or many months once definite time.

In the matching process of character, running into the target character right and left sometimes has the glutinous situation that connects noise to occur.Because the translation placed in the middle that glutinous even noise can influence the input character image is handled, so the character to be identified of this moment often is not the center position that is in matrix.Therefore at this moment need matching process, find out the matching area of template character and character the best to be identified in conjunction with Form board tape move left and right K (K of the present invention can get the picture width of character to be identified at most) location of pixels.Again because computing machine is different from human eye---the thinking arbitration functions is arranged, therefore, all need to use the scroll-up/down of Form board tape and the move left and right method of coming that combines to mate for each character to be identified.

The computing method of matching rate have a variety of, and what the present invention used is the matching degree weighting algorithm, and promptly each template character is overlapping locational matching rate with formula: C=a * P with target character₁+ b * P₂Calculate.A, b are weighting coefficients, a+b=1.In the present invention, a=0.59, b=0.41, but be not limited thereto.P in the formula₁, P₂Be defined as follows respectively:

P₁: character to be identified or half-word symbol prospect and template overlap the pixel ratio that the non-zero pixels of M and Character mother plate counts of counting.

P₂: character to be identified or half-word symbol prospect and template overlap the count ratio of non-0 pixel number of M and input picture of pixel.

Compared with prior art, the present invention has the following advantages:

(1) because there is the phenomenon that half character occurs in the dial plate of table tools such as water meter, present template matches technology can't be carried out correct identification by double character, the present invention makes 0 to 9 in totally ten standard character templates, adjacent Character mother plate joins end to end, wherein 0 and 9 interconnect, form the standard character annular die strip of a ring-type, just data tape as rotating in the water power gas meter.Utilize the data tape rotary principle, rolling Character mother plate band makes ten templates carry out omnibearing displacement coupling with the input character image respectively; And mate in conjunction with left and right displacement when having used brand-new circular template to roll, find optimum matching zone and the highest template position of the goodness of fit, can discern the half-word that is rolled on the diverse location exactly and accord with.

(2) the present invention solves the manual metering problem by the method for image understanding, and this kind technology has versatility, and the enumeration data that can be used for various dial plates reads, and realizes that general automatic data logging charges.

(3) hardware of the inventive method utilization is simple, realizes easily.

Description of drawings

Fig. 1 is the water, electricity and gas meter reading automatic identifying method FB(flow block) based on the coupling of rolling.

Fig. 2 is the pattern of half-word symbol.

Fig. 3-Figure 12 is rolled to 3 part process displaying synoptic diagram for the annular die strip from 0.Wherein, Fig. 3 takes up the beginning position for circular template; Template character 0 is rolled to the synoptic diagram that occurs a half matching area in template character 1 process to Fig. 4 the 9th time the time for the annular die strip is rolled; Fig. 5 is roll a matching area synoptic diagram the 20th time time of annular die strip; Fig. 6 is roll matching area synoptic diagram the 29th time time of annular die strip; Fig. 7 is roll matching area synoptic diagram the 40th time time of annular die strip; Fig. 8 is roll matching area synoptic diagram the 43rd time time of annular die strip; Fig. 9 is roll matching area synoptic diagram the 46th time time of annular die strip; Figure 10 is roll synoptic diagram matching area synoptic diagram the 48th time time of annular die strip; Figure 11 is roll matching area synoptic diagram the 50th time time of annular die strip; Figure 12 is roll matching area synoptic diagram the 52nd time time of annular die strip.

Embodiment

For understanding the present invention better, the present invention is further illustrated below in conjunction with accompanying drawing, but the scope of protection of present invention is not limited to the scope of embodiment statement.

Water, electricity and gas meter reading automatic recognition system hardware based on the coupling of rolling mainly is made up of optical capturing equipment (camera) and Single Chip Microcomputer (SCM) system; Camera is installed on the water power gas meter, and camera connects Single Chip Microcomputer (SCM) system by data line, and Single Chip Microcomputer (SCM) system mainly comprises embedded type control module, Flame Image Process and identification module, power supply etc.Embedded type control module is finished the control and management for total system, system power-up self check, duty indication, Data Transmission Controlling etc.; Flame Image Process and identification module are responsible for realizing image denoising, normalization, Character segmentation, character recognition, output as a result etc.The automatic identification of water, electricity and gas meter reading that the present invention is based on the coupling of rolling realizes by Single Chip Microcomputer (SCM) system.

As shown in Figure 1, a kind of water, electricity and gas meter reading automatic identifying method based on the coupling of rolling may further comprise the steps:

(1) camera (being installed on the water power gas meter) is according to the needs of paying the fees, regularly (as January one or many or many months once) the real time billing data picture of gathering the water power gas meter, be sent to Single Chip Microcomputer (SCM) system by data line.

(2) according to the routine data preprocess method, Single Chip Microcomputer (SCM) system is carried out image binaryzation, location, charging digital block, noise filtering, Character segmentation and half-word symbol to the metering data photo of gathering and is judged full word symbol after obtaining cutting apart and half-word symbol photo; Wherein, location, charging digital block is dial plate reading position in the specific bit metering data photo.Noise filtering comprises filtering Gaussian noise, salt-pepper noise and other noise.Character segmentation is that dial plate reading in the metering data photo behind the noise filtering is become isolated character by column split; Half-word symbol be meant in the metering data photo can not complete demonstration character, as Fig. 2,4,6, character that can not complete demonstration among Fig. 8-12; The character here is meant arabic numeral.By the camera setting, charging digital block location, after the Character segmentation every character picture general maximum have only two can not complete demonstration character.The full word symbol is meant the arabic numeral of complete demonstration; The half-word symbol is the arabic numeral that part shows.

(3) full word symbol to be identified and half-word symbol photo are normalized to the template character boundary, prospect is preserved between two parties; The character stroke zone is a prospect, and pixel is represented with 1 in the prospect, and non-character stroke zone is a background, and pixel is represented with 0 in the background; The template character is meant the fall into a trap computer representation of the pixel-matrix picture of the used font of 0-9 in the expense reading numeric area of water power gas meter to be identified.

(4) for the symbol of the half-word after normalization photo, calculate half-word symbol photo to be identified two middle line-spacings of half-word symbol up and down, copy the form of the data tape in the water power gas meter, according to the character pitch of end to end order of adjacent character and character picture to be identified, ten template character matrixs of 0-9 are vertically connected into the annular die strip; Data tape is meant the water power gas meter order that 0-9 shows in the expense reading numeric area of falling into a trap.

(5) from first template character 0, scroll up in conjunction with move left and right annular die strip, input character and half-word symbol image and circular template band are carried out the calculating of registration coupling; When scrolling up the annular die strip, each displacement that rolls is a unit with a pixel, roll after the pixel unit, image after input picture and the rolling of annular die strip is carried out images match, by that analogy, constantly rolling ring-type Form board tape mates input picture one by one, gets back to template character 0 position again up to the annular die strip; Accord with 0-K location of pixels of image in conjunction with Form board tape move left and right character to be identified or half-word when scrolling up the annular die strip, the character after each rolling of calculating or the move left and right in the corresponding templates band position and the matching rate of input character image, it is registration, the value of described integer K is determined according to template dot matrix size, less than the template width; K of the present invention can get the picture width of character to be identified at most.Move left and right is meant full word symbol to be identified or half-word symbol image is moved to the left 0-K location of pixels, so that mate calculating; Return the position before being moved to the left, and then treat identification character or half-word symbol image 0-K the location of pixels that move right, so that mate calculating.In the coupling that scrolls up, for fear of because the glutinous half-word symbol that connects noise is arranged, the inaccurate matching result that is brought also carries out move left and right.

(6) whenever once move up or move left and right after, the data of character to be identified or half-word symbol image and character scroll template correspondence position dot matrix are multiplied each other, and this result of product are added up, be the coincidence number M of calculating pixel point; Coincidence number M according to pixel calculates matching rate C; Matching rate C=α * (overlap pixel count the non-zero pixels of M/ Character mother plate count)+(1-α) * (overlap pixel count non-0 pixel number of M/ input picture); α is test value or empirical value, can obtain at dissimilar water power gas meters and dissimilar camera tests, and α is the positive number less than 1;

(7) with the each matching rate result of Dynamic Array record; By relatively, select the result of matching rate maximum, determine the pairing template position of maximum result, with the template character that this determines and the input character image mates most; For full word symbol output annular die strip corresponding characters; For half-word symbol, serve as the output result with the corresponding numeral of upper semisection half-word symbol of the annular die strip corresponding region determined; Be this output character just with less numeral in the half-word symbol.

(8) for full word symbol to be identified that has been partitioned into and half-word symbol digital picture, from left to right export the discriminating digit result successively, obtain the charging reading of water power gas meter according to the dial plate reading picture of correspondence.

Fig. 2 is a sample instance of randomly drawing from experimentation of the present invention, is to gather between the data of water meter band is rolled to 2 and 3 the time.As figure Fig. 3-shown in Figure 12, the roll part process of coupling of Fig. 2 is showed.Fig. 3-Figure 12 shows synoptic diagram for the annular die strip is rolled to 3 part processes from 0.Wherein, Fig. 3 takes up the beginning position for circular template; Template character 0 is rolled to the synoptic diagram that occurs a half matching area in template character 1 process to Fig. 4 the 9th time the time for the annular die strip is rolled; Fig. 5 is roll a matching area synoptic diagram the 20th time time of annular die strip; Fig. 6 is roll matching area synoptic diagram the 29th time time of annular die strip; Fig. 7 is roll matching area synoptic diagram the 40th time time of annular die strip; Fig. 8 is roll matching area synoptic diagram the 43rd time time of annular die strip; Fig. 9 is roll matching area synoptic diagram the 46th time time of annular die strip; Figure 10 is roll synoptic diagram matching area synoptic diagram the 48th time time of annular die strip; Figure 11 is roll matching area synoptic diagram the 50th time time of annular die strip; Figure 12 is roll matching area synoptic diagram the 52nd time time of annular die strip, and the matching rate of the circular template of this moment and sample also is the highest (at this moment the registration of the stroke of the stroke among Figure 12 and Fig. 2 sample to be identified is the highest, and promptly the goodness of fit is the highest).As seen, no matter the dial plate data tape forwards that position to, the position that the present invention can find circular template and target image to mate most, thus reach the purpose of identification.

Because there is the phenomenon that half character occurs in the dial plate of table tools such as water meter, present template matches technology can't be carried out correct identification by double character, the present invention makes 0 to 9 in totally ten standard character templates, adjacent Character mother plate joins end to end, wherein 0 and 9 interconnect, form the standard character annular die strip of a ring-type, just data tape as rotating in the water power gas meter.Utilize the data tape rotary principle, rolling Character mother plate band makes ten templates carry out omnibearing displacement coupling with the input character image respectively; And used brand-new circular template tumbling-type to mate in conjunction with left and right displacement, and find optimum matching zone and the highest template of the goodness of fit, can discern the half-word symbol that is rolled on the diverse location exactly.

The inventive method can be applicable to the water power gas meter, but is not limited thereto, and also can be used for the automatic identification of the reading of other similar table tools.

Claims (9)

1. water, electricity and gas meter reading automatic identifying method based on the coupling of rolling is characterized in that may further comprise the steps:

(1) the real time billing data picture of camera timing acquiring water power gas meter is sent to Single Chip Microcomputer (SCM) system by data line;

(2) Single Chip Microcomputer (SCM) system is carried out image binaryzation, location, charging digital block, noise filtering, Character segmentation and the judgement of half-word symbol to the metering data photo of gathering, full word symbol after obtaining cutting apart and half-word symbol photo;

(3) full word symbol to be identified and half-word symbol photo are normalized to the template character boundary, and prospect is preserved between two parties; Described prospect is the character stroke zone, and pixel is represented with 1 in the prospect, and non-character stroke zone is a background, and pixel is represented with 0 in the background;

(4) for the symbol of the half-word after normalization photo, calculate half-word symbol photo to be identified two middle line-spacings of half-word symbol up and down, copy the form of the data tape in the water power gas meter, according to the character pitch of end to end order of adjacent character and character picture to be identified, ten template character matrixs of 0-9 are vertically connected into the annular die strip;

(5) from first template character 0, be the unit annular die strip that scrolls up with a pixel, the character in the corresponding ring-type Form board tape position and input character image are carried out matching rate calculate; Whenever after the annular die strip that once scrolls up, 0-K location of pixels of move left and right character to be identified or half-word symbol image respectively calculates the character in the corresponding templates band position and the matching rate of input character image after each move left and right; The ring-type of rolling again Form board tape is got back to template character 0 position again up to the annular die strip; The value of described K is determined according to template dot matrix size, less than the template width; Matching rate C=α * (overlap pixel count the non-zero pixels of M/ Character mother plate count)+(1-α) * (overlap pixel count non-0 pixel number of M/ input picture); α is an empirical value, is the positive number less than 1; The coincidence number M of pixel for whenever once move up or move left and right after, the data of character to be identified or half-word symbol image and character scroll template correspondence position dot matrix are multiplied each other, and with this result of product income value that adds up;

(6) with the each matching rate result of Dynamic Array record; By relatively, select the result of matching rate maximum, determine the pairing template position of maximum result, with the template character that this determines and the input character image mates most; For full word symbol output annular die strip corresponding characters; For half-word symbol, serve as the output result with the corresponding numeral of upper semisection half-word symbol of annular die strip corresponding region;

(7) for full word symbol to be identified that has been partitioned into and half-word symbol digital picture, from left to right export the discriminating digit result successively, obtain the charging reading of water power gas meter according to the dial plate reading picture of correspondence.

2. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: location, described charging digital block is dial plate reading position in the specific bit metering data photo.

3. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1, it is characterized in that: described noise filtering comprises filtering Gaussian noise, salt-pepper noise and other noise.

4. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described Character segmentation is that dial plate reading in the metering data photo behind the noise filtering is become isolated character by column split.

5. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described half-word symbol be meant in the metering data photo can not complete demonstration character, character is the arabic numeral of 0-9.

6. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described template character is meant the fall into a trap computer representation of the pixel-matrix picture of the used font of 0-9 in the expense reading numeric area of water power gas meter to be identified.

7. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described data tape is meant the fall into a trap order of 0-9 demonstration in the expense reading numeric area of water power gas meter.

8. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described move left and right is meant treats identification character or half-word symbol image is moved to the left 0-K location of pixels, so that mate calculating; Return the position before being moved to the left, and then treat identification character or half-word symbol image 0-K the location of pixels that move right, so that mate calculating.

9. the water, electricity and gas meter reading automatic identifying method based on the coupling of rolling according to claim 1 is characterized in that: described timing is according to January one or many or many months once definite time.

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