CN105320951B - Optical character recognition device and optical character recognition method - Google Patents
Optical character recognition device and optical character recognition method Download PDFInfo
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- CN105320951B CN105320951B CN201410772788.8A CN201410772788A CN105320951B CN 105320951 B CN105320951 B CN 105320951B CN 201410772788 A CN201410772788 A CN 201410772788A CN 105320951 B CN105320951 B CN 105320951B
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Abstract
Even if providing the optical character recognition device and optical character recognition method for also ensuring that character recognition precision in the case where the setting of read area is different.In optical character recognition device, when central operation portion (16) are determined as that character identification rate is lower than the threshold value of regulation discrimination, display shows picture for the reduced warning of warning character discrimination on display terminal portion (12), and show the bill size based on read area coordinate of the reduction reason as character identification rate, cut position, identify font type, projects information of bar code type and read rate, when some project in the shown project information is selected, show some selected project of above-mentioned projects information and the change scheme of the format defined parameters for the project, when being judged to reflecting the shown change scheme, format defined parameters are changed based on the change scheme.
Description
Technical field
Even if the present invention relates to one kind reading object bill (Japanese：Account ticket) etc. the upper printing dislocation for generating character,
Bill can also ensure that the optical character recognition device and optical character identification of character recognition precision in the case where cutting deviation
Method.
Background technique
In general, identify that the optical character for the character recorded or printed on the bill of regulation layout is known optically
Other device is configured to：By character write-in frame (read area) letter of the character printed at the specified position for being used to be written in bill etc.
Breath, printable character font form are stored as format defined parameters, and frame information is written according to the character to identify the definition position of bill
The character set.As the format defined parameters, it is vertical in bill that bill size, the read area in the bill can be enumerated
Starting position and the coordinate of end position, printable character font form, reading object character types (English sum number are read with level
Word, assumed name, katakana, Chinese character, other foreign characters).
However, changing bill printing trader sometimes about the bill or being beaten using the universal printer in oneself company
Print, in this case, according to the difference of bill outer dimension, sheet trimming deviation, the printing precision of printer, there are characters
Write-in frame (read area), the bar code situation different from preset content have the following problems in this case：Ticket
According to outer dimension, read the setting of zone position, character types, character font form, digit in read area etc. and pre-determined
Format defined parameters definition it is different, reading accuracy reduces.
As the document for describing the character recognition device technology for preventing reading accuracy from reducing, can enumerate following special
Sharp document 1 describes following technology in the patent document 1：It is provided with appropriate resolution ratio determination unit and appropriate resolution ratio determination section,
The appropriate resolution ratio determination unit is determined whether based on the character code after optical character recognition process with input resolution ratio appropriate
Image input is carried out, which determines input resolution ratio appropriate to input picture, wherein by suitable
When resolution ratio determination unit is considered as in the setting of input resolution ratio in situation of problems, sounds an alarm, promote with above-mentioned suitable
It by the conversion of resolution of input picture is appropriate defeated when input resolution ratio carries out image input again, or by image processing part
Enter resolution ratio, be efficiently obtained the image of resolution ratio appropriate as a result, even if not set when carrying out image input appropriate
In the case where inputting resolution ratio, it is also prevented from the reduction of reading accuracy.
Patent document 1：Japanese Unexamined Patent Publication 2008-244545 bulletin
Summary of the invention
Problems to be solved by the invention
Even if the technology recorded in above-mentioned patent document is not setting input resolution ratio appropriate to input picture
In the case of can also prevent the reduction of reading accuracy, but have the following problems：In the above-mentioned difference due to bill outer dimension
Different, sheet trimming deviation, the printing precision of printer and character write-in frame (read area) position it is different from preset position
In the case where, only control input resolution ratio is can not to prevent the reduction of reading accuracy.
It is an object of the invention to want to solve the problems, such as above-mentioned conventional art, even if providing one kind in format defined parameters
It can also ensure that the optical character of character recognition precision in the case that defined bill outer dimension, reading zone position etc. are different
Identification device and optical character recognition method.
The solution to the problem
In order to achieve the above object, invention documented by the 1st scheme is a kind of optical character recognition device, has central fortune
Calculation portion, the central operation portion use including bill outer dimension, the read area coordinate for cutting character row from character row image,
The format defined parameters for identifying the threshold value of font type, bar code type and regulation read rate, read bill optically
Character row ingredient image, from the character row ingredient image zooming-out character row image read out, from the character row figure extracted
As cutting character character by character to carry out character recognition and be shown in display terminal portion, the spy of the optical character recognition device
Sign is that central operation portion comprises the following modules：First module is being determined as threshold value of the character identification rate lower than regulation discrimination
When, display shows picture for the reduced warning of warning character discrimination in display terminal portion；Second module shows conduct
The bill size based on read area coordinate of the reduction reason of above-mentioned character identification rate cuts position, identification font type, bar shaped
Projects information of code type and read rate；Third module in the bill size shown by second module, cuts position
It sets, when some project for identifying in font type, bar code type and read rate is selected, shows above-mentioned projects information
Some selected project and the format defined parameters for the project change scheme；And the 4th module, determining
When to reflect the change scheme shown by the third module, format defined parameters, the 2nd side are changed based on the change scheme
Invention documented by case is characterized in that above-mentioned center operational part is to read in the reduction reason for being determined as above-mentioned character identification rate
When the difference of area's coordinate, make to cut regional location based on the read area coordinate defined in above-mentioned format defined parameters with preparatory
The unit of decision it is up and down, left and right, left it is tiltedly upper, left obliquely downward, it is right it is tiltedly upper, right move obliquely downward, based on cut-out area after movement
The character row image cut at the position of domain carries out character recognition, determines whether to be able to carry out character recognition, and selecting can be into
Line character identification cuts region.
In addition, invention documented by the 3rd scheme is a kind of optical character recognition method of optical character recognition device, the light
It learns character recognition device and has central operation portion, which uses including bill outer dimension, is used for from character row figure
It is fixed as cutting the read area coordinate of character row, the format for the threshold value for identifying font type, bar code type and regulation read rate
Adopted parameter reads the character row ingredient image of bill, from the character row ingredient image zooming-out character row read out optically
Image cuts character from the character row image extracted to carry out character recognition and be shown in display terminal portion character by character
On, which is characterised by comprising following steps：First step, central operation portion are being determined as character
When discrimination is lower than the threshold value for providing discrimination, display is used for the reduced warning of warning character discrimination in display terminal portion
Show picture；Second step, then the first step, central operation portion show the reduction reason as above-mentioned character identification rate
Bill size based on read area coordinate, projects letter for cutting position, identification font type, bar code type and read rate
Breath；Third step, the bill size shown by the second step, cut position, identification font type, bar code type with
And some project in read rate is when being selected, central operation portion show above-mentioned projects information it is selected some
The change scheme of mesh and the format defined parameters for the project；And four steps, central operation portion are being judged to reflecting
When the change scheme shown by the third step, format defined parameters are changed based on the change scheme, recorded in the 4th scheme
Invention be characterized in that above-mentioned center operational part is read area coordinate in the reductions reason that is determined as above-mentioned character identification rate
When difference, make to cut regional location based on the read area coordinate defined in above-mentioned format defined parameters with pre-determined list
Position it is up and down, left and right, left it is tiltedly upper, left obliquely downward, it is right it is tiltedly upper, right move obliquely downward, based on cutting at regional location after movement
The character row image cut carries out character recognition, determines whether to be able to carry out character recognition, selected to be able to carry out character knowledge
It is other to cut region.
The effect of invention
Optical character recognition device and optical character recognition method of the invention is being determined as character identification rate lower than rule
When determining the threshold value of discrimination, display shows picture for the reduced warning of warning character discrimination, and shows as character
The bill size based on read area coordinate of the reduction reason of discrimination, cut position, identification font type, bar code type with
And projects information of read rate shows above-mentioned projects when some project of the shown project information is selected
Some selected project of information and the change scheme of the format defined parameters for the project, are being determined as institute to be reflected
When the change scheme of display, format defined parameters are changed based on the change scheme, even if thus in format defined parameters
The bill outer dimension of definition can also ensure that character recognition precision in the case that read zone position etc. different.
Detailed description of the invention
Fig. 1 is the figure for indicating the basic structure of the optical character recognition device based on embodiments of the present invention.
Fig. 2 is the figure for indicating the elemental motion process of the optical character recognition device based on present embodiment.
Fig. 3 is the figure for indicating the deflection process flow of the optical character recognition device based on present embodiment.
Fig. 4 is the figure for indicating the suggestion process flow of the optical character recognition device based on present embodiment.
Fig. 5 is the figure for indicating read area and suggestion display based on present embodiment.
Fig. 6 is to indicate that multiple suggestions based on present embodiment show exemplary figure.
Fig. 7 is the figure for indicating the hunting action of the reading zone position based on present embodiment.
Description of symbols
10：Image pickup section；11：Operating terminal portion；12：Display terminal portion；13：The portion (sorter) of sorting；14：It deposits outside
Storage portion；15：Memory；16：Central operation portion；17：Communication unit.
Specific embodiment
The optical character identification based on optical character recognition method of the invention is realized in the following, being described in detail with reference to the attached drawings
One embodiment of device.
[structure]
As shown in Figure 1, the optical character recognition device based on present embodiment has：Sorting portion 13, by the ticket of stacking
According to one by one extracting out and convey；Image pickup section 10 reads the character of the bill conveyed by the sorting portion 13 optically；
Memory 15 temporarily saves the bill images etc. that the image pickup section 10 is read out；External storage portion 14 saves format
Defined parameters, bill images, character picture and identification character etc.；Central operation portion 16, to the character recognition of character picture,
Suggestion (suggest) function based on present embodiment is controlled；Display terminal portion 12, display character picture, identification word
Symbol, picture etc.；Operating terminal portion 11 is used to observe picture shown by the display terminal portion 12 by operator to grasp
Make；And communication unit 17, it will identify that character etc. is sent to other computers, wherein the optical character recognition device is configured to：
By the control in the central operation portion 16, image pickup section 10 reads the character printed on the bill conveyed by sorting portion 13, into
Line character identifies and is saved in external storage portion 14.
Above-mentioned format defined parameters include bill outer dimension, the read area seat for cutting character row from character row image
(cutting position), identification font type, bar code type and the threshold value for providing read rate are marked, following purposes is used for：Center fortune
Calculation portion 16 uses these information from character row ingredient image (the wide model including the character row image being only made of multiple characters
The image enclosed) character row image is cut, character is cut character by character from the character row image cut carries out character
Identification.
The elemental motion of the optical character recognition device constituted in this way is as shown in Fig. 2, the beginning handled by a bill
Following steps are executed, are thus acted to identify conveyed bill character：Step S21, central operation portion 16 receive outer
The format defined parameters saved in portion's storage unit 14；Step S22 is detected by sensor (not shown) and is conveyed by sorting portion 13
Bill front-end and back-end；Step S23 detects the left and right end of bill, cuts the character zone image for recording character；Step
S24, from the character zone image zooming-out character row ingredient image cut out by step S23；Step S25, in order to from passing through
The character row ingredient image that step S24 is extracted cuts character row image, is allocated on up and down to row；Step S26, from
It is allocated on left and right by character row image of the step S25 after upper distribution up and down by each character；Step S27, will
The character picture that character cuts as each character；Step S28 is identified by the character picture that step S27 is cut out, when sentencing
Be set to there are when next character picture return to above-mentioned steps S24；And step S29, it is transmitted through step S28 and identifies
Character, determine whether the character recognition of a bill terminates, ended processing at the end of being determined as, be judged to being not finished
When return to above-mentioned steps S23.
The optical character recognition device has when S24 through the above steps extracts character row ingredient image to character row figure
Deflection (skew) corrected function of picture, the deflection of the character row image are in the conveying of transported bill or printing
Inclination conveying when printer conveying when character and to cause character row to be obliquely scanned relative to bill end caused,
Width ω, height are set for starting point with coordinate (x, y) from the left upper end of the bill of width W, height L as shown in (a) of Fig. 3
Spend the read area (region) of t and be printed with digital " 5793 " and the character row ingredient image as shown in (b) of Fig. 3 due to
Inclination conveying bill etc. and read area are in the scanned situation of the state for having tilted angle, θ, the skew correction function is to execute
The mode of following steps is acted：Detect character row ingredient image in bill front end, rear end, left end, right end, based on
Difference between defined value detects deflection (angle, θ)；Character row image rotation angle "-θ " is extracted to (c) of Fig. 3
Shown in character row image；Defined character size, which is based on, from the character row image as shown in (d) of Fig. 3 cuts a word
Symbol；And number shown in (e) of Fig. 3 " 5 " are identified based on the character picture cut.
In particular, the optical character recognition device based on present embodiment has when a character recognition is handled according to word
It accords with the monitoring of discrimination or the instruction from operator comes the suggestion function (proposing function) of additional character identification, the suggestion function
It can be acted as shown in Figure 4 to execute following steps：Step S41 starts calibrating processing by central operation portion；Step
S42 determines to be with current format defined parameters according to discrimination by monitoring character identification rate lower than regulation discrimination etc.
No there are problems, end processing when being determined as that there is no problem；Step S43 is determined to have problem in step S42
When, operator (cut position difference, font/bar code difference, read rate, bill with warning content and define content
Difference) corresponding aftermentioned alerting picture shows；Step S44, then step S43 carries out detailed suggestion display；And step
Rapid S45, when changing setting (cutting position, font/bar code, bill define the difference of content) by step S44, instead
Reflect the corrected value of the setting content.
Show in the alerting picture that S43 through the above steps is carried out, for example, alert content be cut position difference and
The sheet width as shown in (a) of Fig. 5 is W, be highly L, the left upper end coordinate of read area is (Xs, Ys), bottom righthand side coordinate
In the case where for (Xe, Ye), as shown in (b) of Fig. 5, show that character row image 51 and format as bill scanning result define
The read area 52 set in parameter, the thus difference of the position of both diagrams, and by definition value and the corrected value that can change
It is display together with pull-down menu (△ ▽), the reading based on format defined parameters can be made by operating the pull-down menu
The position in area 52 and the position consistency of character row image 51.
It is shown about the warning, shows definition as shown in (a) of Fig. 6 in situation of problems on character font
Font, approximate font and judgement as a result, and button by pressing parameter reflection show the picture for being changed to approximate font,
On discrimination in situation of problems as shown in (b) of Fig. 6 viewing area name, read rate and judgement as a result, in ticket
Defining according to bills such as sizes " will be determined as that bill defines content as shown in (c) of Fig. 6 in situation of problems in content
Differ widely when being designed with bill." display the stipulated time, by press the Fig. 6 (c) details button come (d) institute of such as Fig. 6
Show that carrying out menu to " bill size ", " cutting position ", " font/bar code ", the projects of " read rate " like that shows, such as
When pressing bill size button, the definition value of presentation of bill size, actual average value, difference as shown in (e) of Fig. 6
And determine result.
In addition, in the above-described embodiment, illustrating showing the case where warning for cutting position difference shows picture
Under the example for cutting the position in region is adjusted by manually by operator, but the invention is not restricted to this, can also detect
Automatically adjustment cuts position when cutting position difference out, which is also configured to flowering structure：Such as Fig. 7
(a) such central operation portion shown in is judged to cutting character row samely even if the definition according to format defined parameters
In the case that also specified value is not achieved in image, accuracy of identification, as shown in (b) of Fig. 7, central operation portion makes in shown in # shape
Centre cut regional location with pre-determined unit to upper and lower, left and right shown in arrow 70 to 77, it is left tiltedly it is upper, left obliquely downward,
The right tiltedly upper, right side is moved obliquely downward, carries out character knowledge based on the character row image cut at regional location that cuts after movement
Not, determine whether to be able to carry out character recognition, the selected region that cuts for being able to carry out character recognition, thus adjustment and proposal are cut
The position in region.
In this way, in the present embodiment, it includes bill outer dimension that central operation portion 16, which uses, is used for from character row image
Cut read area coordinate (cutting position), identification font type, bar code type and the threshold value for providing read rate of character row
Format defined parameters, read the character row ingredient of the bill conveyed by sorting portion 13 optically by image pickup section 10
Image, from the character row ingredient image zooming-out character row image read out, character by character from the character row image extracted
Character is cut to carry out character recognition and be shown in display terminal portion 12, in this optical character recognition device and optics word
It accords in recognition methods, by executing following steps, even if the bill outer dimension defined in format defined parameters, reading position
Set etc. it is different in the case where can also ensure that character recognition precision：First step, above-mentioned center operational part 16 are being determined as character
When discrimination is lower than the threshold value for providing discrimination, display is used for the reduced police of warning character discrimination in display terminal portion 12
Accuse display picture；Second step, then the first step, above-mentioned center operational part 16 show the drop as above-mentioned character identification rate
The bill size based on read area coordinate of low reason cuts position, identification font type, bar code type and read rate
Projects information；Third step in the bill size shown by the second step, cuts position, identification font type, bar shaped
When some project in code type and read rate is selected, above-mentioned center operational part 16 shows the institute of above-mentioned projects information
Some project of selection and the change scheme of the format defined parameters for the project；And four steps, above-mentioned center fortune
It is fixed that format is changed based on the change scheme when the change scheme shown by the third step will be reflected by being determined as in calculation portion 16
Adopted parameter.
Claims (4)
1. a kind of optical character recognition device has central operation portion, which uses including bill outer dimension, uses
In cutting the read area coordinate of character row, identification font type, bar code type and regulation read rate from character row image
The format defined parameters of threshold value read the character row ingredient image of bill, from the character row component-part diagram read out optically
As extracting character row image, character is cut character by character from the character row image extracted to carry out character recognition and show
In display terminal portion, which is characterized in that, above-mentioned center operational part comprises the following modules：
First module shows in display terminal portion and is used for when being determined as that character identification rate is lower than the threshold value of regulation discrimination
The reduced warning of warning character discrimination shows picture；
Second module shows the bill size based on read area coordinate of the reduction reason as above-mentioned character identification rate, cuts
Position, projects information for identifying font type, bar code type and read rate；
Third module in the bill size shown by second module, cuts position, identification font type, bar code type
And some project in read rate is when being selected, show above-mentioned projects information some selected project and for
The change scheme of the format defined parameters of the project；And
4th module is become when being judged to reflecting the change scheme shown by the third module based on the change scheme
More format defined parameters.
2. optical character recognition device according to claim 1, which is characterized in that
Above-mentioned center operational part makes to be based on when the reduction reason for being determined as above-mentioned character identification rate is the difference of read area coordinate
The read area coordinate defined in above-mentioned format defined parameters cut regional location with pre-determined unit up and down, it is left,
It is right, left it is tiltedly upper, left obliquely downward, it is right it is tiltedly upper, right move obliquely downward, based on after movement cut the character row cut out at regional location
Image carries out character recognition, determines whether to be able to carry out character recognition, it is selected be able to carry out character recognition cut region.
3. a kind of optical character recognition method of optical character recognition device, the optical character recognition device have central operation
Portion, the central operation portion use including bill outer dimension, the read area coordinate for cutting character row from character row image, know
The format defined parameters of the threshold value of other font type, bar code type and regulation read rate, read bill optically
Character row ingredient image, from the character row ingredient image zooming-out character row image read out, from the character row image extracted
Cut character character by character to carry out character recognition and be shown in display terminal portion, the feature of the optical character recognition method
It is, includes the following steps：
First step, central operation portion is when being determined as that character identification rate is lower than the threshold value of regulation discrimination, in display terminal portion
Reduced warning of the upper display for warning character discrimination shows picture；
Second step, the then first step, central operation portion show the reduction reason as above-mentioned character identification rate based on
The bill size of read area coordinate, projects information for cutting position, identification font type, bar code type and read rate；
Third step in the bill size shown by the second step, cuts position, identification font type, bar code type
And some project in read rate is when being selected, central operation portion show above-mentioned projects information it is selected some
The change scheme of project and the format defined parameters for the project；And
Four steps, central operation portion are based on the change when the change scheme shown by the third step will be reflected by being determined as
More scheme changes format defined parameters.
4. optical character recognition method according to claim 3, which is characterized in that
Above-mentioned center operational part makes to be based on when the reduction reason for being determined as above-mentioned character identification rate is the difference of read area coordinate
The read area coordinate defined in above-mentioned format defined parameters cut regional location with pre-determined unit up and down, it is left,
It is right, left it is tiltedly upper, left obliquely downward, it is right it is tiltedly upper, right move obliquely downward, based on after movement cut the character row cut out at regional location
Image carries out character recognition, determines whether to be able to carry out character recognition, it is selected be able to carry out character recognition cut region.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2014-127811 | 2014-06-23 | ||
| JP2014127811A JP6300663B2 (en) | 2014-06-23 | 2014-06-23 | Optical character recognition device and optical character recognition method |
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| CN105320951B true CN105320951B (en) | 2018-11-20 |
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| CN105956590A (en) * | 2016-04-27 | 2016-09-21 | 泰合鼎川物联科技（北京）股份有限公司 | Character recognition method and character recognition system |
| CN106096601B (en) * | 2016-06-06 | 2019-06-18 | 深圳辰通智能股份有限公司 | The method and system of character types in a kind of automatic detection bill |
| JP6614186B2 (en) * | 2017-03-21 | 2019-12-04 | カシオ計算機株式会社 | Book document processing apparatus, book document processing method, and program |
| CN107016363B (en) * | 2017-03-30 | 2020-06-05 | 理光图像技术（上海）有限公司 | Bill image management device, bill image management system, and bill image management method |
| CN109426815B (en) * | 2017-08-22 | 2022-05-10 | 顺丰科技有限公司 | Bill region rotating and splitting method, system and equipment |
| JP7147208B2 (en) * | 2018-03-20 | 2022-10-05 | 富士フイルムビジネスイノベーション株式会社 | Information processing device and program |
| CN108734089B (en) * | 2018-04-02 | 2023-04-18 | 腾讯科技（深圳）有限公司 | Method, device, equipment and storage medium for identifying table content in picture file |
| JP6711523B2 (en) * | 2018-05-25 | 2020-06-17 | 株式会社ふくおかフィナンシャルグループ | Form recognition system |
| CN112308056A (en) * | 2019-07-26 | 2021-02-02 | 深圳怡化电脑股份有限公司 | Method, device and equipment for acquiring note characteristic region and storage medium |
| JP7486954B2 (en) * | 2020-01-08 | 2024-05-20 | Tis株式会社 | Form processing program, form processing device, and form processing method |
| CN111291741B (en) * | 2020-05-13 | 2020-11-03 | 太平金融科技服务（上海）有限公司 | Receipt identification method and device, computer equipment and storage medium |
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| Publication number | Publication date |
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| JP6300663B2 (en) | 2018-03-28 |
| JP2016009223A (en) | 2016-01-18 |
| CN105320951A (en) | 2016-02-10 |
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