CN110070491A - Bank card picture antidote, device, equipment and storage medium - Google Patents
Bank card picture antidote, device, equipment and storage medium Download PDFInfo
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- CN110070491A CN110070491A CN201910206042.3A CN201910206042A CN110070491A CN 110070491 A CN110070491 A CN 110070491A CN 201910206042 A CN201910206042 A CN 201910206042A CN 110070491 A CN110070491 A CN 110070491A
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- 239000000729 antidote Substances 0.000 title claims abstract description 21
- 230000009466 transformation Effects 0.000 claims abstract description 111
- 239000011159 matrix material Substances 0.000 claims abstract description 64
- 238000012937 correction Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 25
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000605 extraction Methods 0.000 claims abstract description 15
- 238000013519 translation Methods 0.000 claims description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 238000003702 image correction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
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- 239000012141 concentrate Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229940075522 antidotes Drugs 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/60—Rotation of whole images or parts thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/60—Rotation of whole images or parts thereof
- G06T3/608—Rotation of whole images or parts thereof by skew deformation, e.g. two-pass or three-pass rotation
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Abstract
The present invention relates to image procossing, a kind of bank card picture antidote, device, equipment and storage medium are disclosed, this method comprises: the bank card graphic template for obtaining bank card picture and locally prestoring；Feature Points Matching is carried out to bank card picture according to bank card graphic template, and the transformation matrix between bank card graphic template and bank card picture is obtained according to matching result；Affine transformation is carried out to bank card picture further according to transformation matrix, target bank card picture after obtaining correction, since the present embodiment is to carry out Feature Points Matching to bank card picture according to pre-set bank card graphic template, then transformation matrix is constructed according to matching result, affine transformation is carried out to obtain the target bank card picture after correction to bank card picture further according to transformation matrix, it is corrected so as to the bank card picture to all kinds of shooting irregularities, ensure that the subsequent smooth extraction to bank card information.
Description
Technical field
The present invention relates to technical field of image processing more particularly to a kind of bank card picture antidote, device, equipment and
Storage medium.
Background technique
In internet area, online trading is usually associated with the typing of bank card information, such as user is answered by client
The number for when buying commodity with program, needing to input corresponding bank card account to complete to pay, but being related to due to bank card number
Word is more, and user tends to malfunction when being manually entered, and experience sense is relatively poor.Therefore, most of client is all at present
Have the function of shoot typing bank card content information, and actually user by camera shooting bank card picture when, by
It does not ensure that each picture taken is all normal morphology in the reason of bank card places inclination or device hardware, adopts
Collect the picture obtained and in most cases all has certain tilt angle, even stand upside down or corner missing, for this
Class shoots irregularity bank card picture, and the prior art is usually to use the modes such as binaryzation, expansion process to carry out content to it
Information extraction, but the problem of due to this kind of picture itself, often efficiency is lower and accuracy is not high for this information extraction mode.Cause
How this, carry out image flame detection to the bank card picture of this kind of shooting irregularity, so that the subsequent picture based on after correction carries out
Content information extracts, improves information extraction efficiency, just becomes a urgent problem to be solved.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of bank card picture antidote, device, equipment and storage medium,
Aim to solve the problem that the technical issues of prior art effectively can not carry out image flame detection to the bank card picture that needs are corrected.
To achieve the above object, the present invention provides a kind of bank card picture antidote, the method includes following steps
It is rapid:
The bank card graphic template for obtaining bank card picture and locally prestoring；
Feature Points Matching is carried out to the bank card picture according to the bank card graphic template, and is obtained according to matching result
Take the transformation matrix between the bank card graphic template and the bank card picture；
Affine transformation is carried out to the bank card picture according to the transformation matrix, the target bank card figure after obtaining correction
Piece.
Preferably, the step for carrying out Feature Points Matching to the bank card picture according to the bank card graphic template
Suddenly, comprising:
Feature point extraction is carried out to the bank card graphic template, to obtain the corresponding benchmark of the bank card graphic template
Feature point set；
Feature point extraction is carried out to the bank card picture, to obtain the corresponding characteristic point to be matched of the bank card picture
Collection；
Feature Points Matching is carried out to the feature point set to be matched using the reference characteristic point set as matching benchmark.
Preferably, the change obtained according to matching result between the bank card graphic template and the bank card picture
The step of changing matrix, comprising:
Determine the characteristic point pair of successful match according to the matching result, the characteristic point centering include reference characteristic point and
Target corresponding to reference characteristic point characteristic point to be matched；
Obtain the reference characteristic point base position coordinate and the mesh locating in the bank card graphic template
Mark the corresponding matching position coordinate of characteristic point to be matched；
The bank card graphic template and the silver are obtained according to the base position coordinate and the matching position coordinate
Transformation matrix between row card picture.
Preferably, the reference characteristic point base position locating in the bank card graphic template that obtains is sat
The step of mark and target characteristic point to be matched corresponding matching position coordinate, comprising:
The frame of reference is established as coordinate origin using the bank card vertex of pre-configured orientation in the bank card graphic template；
Base position coordinate locating for the reference characteristic point is obtained based on the frame of reference；
The bank card picture is aligned on the corresponding bank card vertex of the pre-configured orientation with the coordinate origin, and is obtained
The matching position coordinate for taking target characteristic point to be matched described in the bank card picture locating in the frame of reference.
Preferably, described that the bank card picture mould is obtained according to the base position coordinate and the matching position coordinate
The step of transformation matrix between plate and the bank card picture, comprising:
According to the base position coordinate and the matching position coordinate, obtains and the matching position coordinate is transformed to institute
State corresponding transformation parameter when the coordinate of base position；
The characteristic points of all successful match is traversed to the characteristic point to obtain successful match to corresponding transformation parameter；
The transformation matrix between the bank card graphic template and the bank card picture is constructed according to the transformation parameter.
It preferably, include translation parameters, rotation parameter and/or zooming parameter in the transformation parameter；
It is described that affine transformation is carried out to the bank card picture according to the transformation matrix, the target bank after obtaining correction
The step of card picture, comprising:
The characteristic point in the feature point set to be matched is translated according to the translation parameters, the spy after obtaining translation
Sign point；And/or
The characteristic point in the feature point set to be matched is rotated according to the rotation parameter, obtains postrotational spy
Sign point；And/or
The characteristic point in the feature point set to be matched is zoomed in and out according to the zooming parameter, the spy after obtaining scaling
Sign point；
It is generated according to the characteristic point after characteristic point, the postrotational characteristic point and/or the scaling after the translation
Target bank card picture after correction.
Preferably, described the step of Feature Points Matching is carried out to the bank card picture according to the bank card graphic template
Before, the method also includes:
The bank card picture is converted into gray level image, is extracted in the bank card picture according to the gray level image
Bank card profile；
The corresponding template contours of the bank card graphic template locally prestored are read, detect institute according to the template contours
State whether bank card profile meets pre-set image correction condition；
If satisfied, then execute it is described according to the bank card graphic template to the bank card picture carry out Feature Points Matching
The step of.
In addition, to achieve the above object, the present invention also proposes a kind of bank card picture apparatus for correcting, described device includes:
Picture obtains module, for obtaining bank card picture and the local bank card graphic template that prestores；
Characteristic matching module, for carrying out characteristic point to the bank card picture according to the bank card graphic template
Match, and the transformation matrix between the bank card graphic template and the bank card picture is obtained according to matching result；
Picture rectification module is obtained and is rectified for carrying out affine transformation to the bank card picture according to the transformation matrix
Target bank card picture after just.
In addition, to achieve the above object, the present invention also proposes a kind of bank card picture correcting device, the equipment includes:
The bank card picture correction program that memory, processor and being stored in can be run on the memory and on the processor,
The step of bank card picture correction program is arranged for carrying out bank card picture antidote as described above.
In addition, to achieve the above object, the present invention also proposes a kind of storage medium, bank is stored on the storage medium
Card picture corrects program, and the bank card picture correction program realizes bank card picture as described above when being executed by processor
The step of antidote.
The present invention passes through acquisition bank card picture and the bank card graphic template locally prestored；According to bank card picture mould
Plate carries out Feature Points Matching to bank card picture, and is obtained between bank card graphic template and bank card picture according to matching result
Transformation matrix；Affine transformation is carried out to bank card picture further according to transformation matrix, the target bank card picture after obtaining correction,
Due to the present invention be according to pre-set bank card graphic template to bank card picture carry out Feature Points Matching, then according to
Transformation matrix is constructed with result, affine transformation is carried out to bank card picture further according to transformation matrix to obtain the target silver after correction
Row card picture is corrected so as to the bank card picture to all kinds of shooting irregularities, ensure that subsequent to bank card information
Smooth extraction.
Detailed description of the invention
Fig. 1 is the structural representation of the bank card picture correcting device for the hardware running environment that the embodiment of the present invention is related to
Figure；
Fig. 2 is the flow diagram of bank card picture antidote first embodiment of the present invention；
Fig. 3 is the flow diagram of bank card picture antidote second embodiment of the present invention；
Fig. 4 is the flow diagram of bank card picture antidote 3rd embodiment of the present invention；
Fig. 5 is the structural block diagram of bank card picture apparatus for correcting first embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig.1, Fig. 1 is the bank card picture correcting device knot for the hardware running environment that the embodiment of the present invention is related to
Structure schematic diagram.
As shown in Figure 1, the bank card picture correcting device may include: processor 1001, such as central processing unit
(Central Processing Unit, CPU), communication bus 1002, user interface 1003, network interface 1004, memory
1005.Wherein, communication bus 1002 is for realizing the connection communication between these components.User interface 1003 may include display
Shield (Display), input unit such as keyboard (Keyboard), optional user interface 1003 can also include that the wired of standard connects
Mouth, wireless interface.Network interface 1004 optionally may include standard wireline interface and wireless interface (such as Wireless Fidelity
(WIreless-FIdelity, WI-FI) interface).Memory 1005 can be the random access memory (Random of high speed
Access Memory, RAM) memory, be also possible to stable nonvolatile memory (Non-Volatile Memory,
), such as magnetic disk storage NVM.Memory 1005 optionally can also be the storage device independently of aforementioned processor 1001.
It will be understood by those skilled in the art that structure shown in Fig. 1 is not constituted to bank card picture correcting device
It limits, may include perhaps combining certain components or different component layouts than illustrating more or fewer components.
As shown in Figure 1, as may include operating system, data storage mould in a kind of memory 1005 of storage medium
Block, network communication module, Subscriber Interface Module SIM and bank card picture correct program.
In bank card picture correcting device shown in Fig. 1, network interface 1004 is mainly used for carrying out with network server
Data communication；User interface 1003 is mainly used for carrying out data interaction with user；In bank card picture correcting device of the present invention
Processor 1001, memory 1005 can be set in bank card picture correcting device, and the bank card picture correcting device is logical
It crosses processor 1001 and calls the bank card picture correction program stored in memory 1005, and execute provided in an embodiment of the present invention
Bank card picture antidote.
The embodiment of the invention provides a kind of bank card picture antidotes, are bank card figure of the present invention referring to Fig. 2, Fig. 2
The flow diagram of piece antidote first embodiment.
In the present embodiment, the bank card picture antidote the following steps are included:
Step S10: the bank card graphic template for obtaining bank card picture and locally prestoring；
It should be noted that the executing subject of the method for the present invention can be with Image Acquisition, data operation and program
The computer terminal (hereinafter referred to as terminal) of operation function.The bank card graphic template can be developer and match in advance
That sets is used to carry out the reference template of image flame detection (including Slant Rectify, correction of standing upside down), includes that position is fixed in the template
Unionpay logo (trade mark), and location information of the Unionpay logo in bank card logo template can be used as the other banks of detection
Whether card picture needs to carry out the criterion of picture correction.
In the concrete realization, terminal can obtain the bank card picture of user's shooting, then read local pre-stored institute
State bank card graphic template.Certainly, bank card graphic template described in the present embodiment can be divided into multiple (such as Unionpay's strap forms
With non-Unionpay's strap form etc.), terminal can first detect whether bank card picture carries before obtaining corresponding bank card graphic template
There is Unionpay logo, Unionpay's strap form is obtained if having, if without obtaining non-Unionpay's strap form.
Step S20: according to the bank card graphic template to the bank card picture carry out Feature Points Matching, and according to
The transformation matrix between the bank card graphic template and the bank card picture is obtained with result；
It should be understood that so-called characteristic point, i.e. image characteristic point, it is able to reflect image substantive characteristics, can be identified for that figure
The target object as in.In this step, terminal can carry out feature point extraction to the bank card graphic template, to obtain the bank
The corresponding reference characteristic point set of card graphic template；Then feature point extraction is carried out to the bank card picture, to obtain the silver
The corresponding feature point set to be matched of row card picture；Using the reference characteristic point set as matching benchmark to the characteristic point to be matched
Collection carries out Feature Points Matching.Matrix element in the transformation matrix can be transformation parameter, these transformation parameters are used to characterize
Each characteristic point corresponding translation when being transformed to bank card graphic template from bank card picture, the distance of rotation or scaling, angle or
Ratio.
Certainly, it since bank card graphic template is relatively fixed under normal conditions, will not arbitrarily change, to improve bank card figure
The correction efficiency of piece avoids all repeating to extract above-mentioned " reference characteristic point when carrying out identification correction to each bank card picture
Collection ", increase the workload of terminal, can will acquire in the present embodiment described in " reference characteristic point set " carry out packing storage, with
Continue after an action of the bowels and calls directly.
Further, it is contemplated that in some special cases, the bank card picture of user's shooting may be sufficiently complete, and or
Be in the bank card picture that takes only partial region be include the effective coverage of bank card information, and these effective coverages
Provided information is not sufficient to support extraction of the terminal to bank card information after image flame detection.Therefore the present embodiment bank card figure
Before executing the step S20, whether the bank card picture that will also detect user's shooting meets image is rectified piece antidote
Positive condition.Specifically, the bank card picture is converted to gray level image by the terminal, according to gray level image extraction
Bank card profile in bank card picture；The corresponding template contours of the bank card graphic template locally prestored are read, according to
The template contours detect whether the bank card profile meets pre-set image correction condition；If satisfied, then executing the step
S20。
It should be understood that described be converted to gray level image for bank card picture, i.e., bank card picture is carried out at gray processing
Reason obtains gray level image, then passes through threshold function table again for greyscale image transitions at bianry image, then again from the binary map
Corresponding bank card profile is extracted as in.In addition, the pre-set image correction condition can be under same scaling
The Duplication of bank card profile and template contours is higher than a certain given threshold.The Duplication will two pictures be superimposed
When institute attainable Maximum overlap region corresponding accounting.
In the concrete realization, terminal can carry out Feature Points Matching to bank card picture according to bank card graphic template, then
The transformation matrix between bank card graphic template and bank card picture is obtained according to matching result.
Step S30: affine transformation is carried out to the bank card picture according to the transformation matrix, the target after obtaining correction
Bank card picture.
It should be understood that so-called affine transformation, also known as affine maps, refer to that a vector space carries out primary in geometry
Linear transformation simultaneously connects a translation, is transformed to another vector space.Affine transformation is a kind of two-dimensional coordinate to two-dimensional coordinate
Between linear transformation, it maintain " grazing " (straight line is still straight line after transformation) of X-Y scheme with it is " parallel
Property " (relative positional relationship between X-Y scheme remains unchanged, and parallel lines are still parallel lines, and the position of Points on Straight Line is suitable
Sequence is constant).
It will be appreciated that the transformation parameter in the transformation matrix includes but is not limited to translation parameters, rotation in the present embodiment
Turn parameter and/or zooming parameter；Correspondingly, the step S30 can include: according to the translation parameters to the feature to be matched
The characteristic point that point is concentrated is translated, the characteristic point after obtaining translation；And/or according to the rotation parameter to the spy to be matched
The characteristic point that sign point is concentrated is rotated, and postrotational characteristic point is obtained；And/or according to the zooming parameter to described to be matched
Characteristic point in feature point set zooms in and out, the characteristic point after obtaining scaling；Then according to the characteristic point, described after the translation
Characteristic point after postrotational characteristic point and/or the scaling generates the target bank card picture after correction.In addition, the transformation
Parameter is the transformation parameter of all characteristic points of bank card picture.
In the concrete realization, terminal, can be according to the transformation matrix to bank card after getting the transformation matrix
Picture carries out affine transformation to obtain the target bank card picture after correction, is based on the target bank card picture again so as to subsequent
Extract the information such as bank card number wherein included.
The present embodiment passes through acquisition bank card picture and the bank card graphic template locally prestored；According to bank card picture
Template carries out Feature Points Matching to bank card picture, and according to matching result obtain bank card graphic template and bank card picture it
Between transformation matrix；Affine transformation is carried out to bank card picture further according to transformation matrix, the target bank card figure after obtaining correction
Piece, since the present embodiment is to carry out Feature Points Matching to bank card picture according to pre-set bank card graphic template, then
Transformation matrix is constructed according to matching result, after carrying out affine transformation to bank card picture further according to transformation matrix to obtain correction
Target bank card picture is corrected so as to the bank card picture to all kinds of shooting irregularities, ensure that subsequent to bank
The smooth extraction of card information.
With reference to Fig. 3, Fig. 3 is the flow diagram of bank card picture antidote second embodiment of the present invention.
It is in the present embodiment, described that the bank card picture mould is obtained according to matching result based on above-mentioned first embodiment
The step of transformation matrix between plate and the bank card picture, comprising:
Step S201: the characteristic point pair of successful match is determined according to the matching result, the characteristic point centering includes base
Quasi- characteristic point and target characteristic point to be matched corresponding to the reference characteristic point；
It should be noted that the characteristic point is to being capable of successful match in i.e. reference characteristic point set and feature point set to be matched
Two characteristic points, such as the reference characteristic point be (x, y), the target characteristic point to be matched be the characteristic point to be matched
Concentrate with (x, y) corresponding characteristic point (x ', y '), then the characteristic point is to for " [(x, y), (x ', y ')] ".
In the concrete realization, terminal according to the matching result of reference characteristic point set and feature point set to be matched determine matching at
The characteristic point pair of function.
Step S202: obtaining reference characteristic point base position coordinate locating in the bank card graphic template,
And the corresponding matching position coordinate of the target characteristic point to be matched；
It will be appreciated that picture is to be made of several pixels, and the pixel of different number is according to ad hoc fashion group
It is combined and just constitutes the characteristic point of a picture.Terminal will also when extracting the characteristic point of bank card picture in the present embodiment
Record each characteristic point information the location of in picture, i.e. characteristic point relative position locating in picture, so-called opposite position
Set i.e. origin position it is selected in the case where, position of remaining each characteristic point for the respective place of the origin.
In the concrete realization, terminal can obtain the reference characteristic point in the silver based on the frame of reference constructed in advance
The locating corresponding matching position coordinate of base position coordinate and target characteristic point to be matched in row card graphic template.
It should be noted that the present embodiment terminal is when establishing the frame of reference, it can be first with the bank card picture
The frame of reference is established as coordinate origin in the bank card vertex of pre-configured orientation in template；The frame of reference is then based on to obtain
Take base position coordinate locating for the reference characteristic point；Again by the bank card picture in the corresponding bank of the pre-configured orientation
Card vertex is aligned with the coordinate origin, and obtains target characteristic point to be matched described in the bank card picture in the benchmark
Locating matching position coordinate in coordinate system.
Wherein, the pre-configured orientation can be any in four orientation such as the lower left corner, the upper left corner, the lower right corner, upper right corner
One, such as using the bank card vertex in the lower left corner in bank card graphic template as origin, then by bank in bank card picture
The vertex in the card lower left corner is aligned with the origin in template picture, then calculates the positional relationship in two pictures between same characteristic point
(such as horizontal distance, vertical range etc.).
Step S203: the bank card graphic template is obtained according to the base position coordinate and the matching position coordinate
Transformation matrix between the bank card picture.
In the concrete realization, the base position coordinate and mesh of terminal reference characteristic point in getting each characteristic point pair
After the matching position coordinate for marking characteristic point to be matched, base position coordinate and target can be calculated according to their coordinate relationship
Then transformation parameter between characteristic point to be matched constructs transformation matrix according to these transformation parameters.
The present embodiment determines the characteristic point pair of successful match according to matching result, and the characteristic point centering includes reference characteristic
The point target to be matched characteristic point corresponding with reference characteristic point；Obtain reference characteristic point base locating in bank card graphic template
Quasi- position coordinates and the corresponding matching position coordinate of target characteristic point to be matched；According to base position coordinate and matching position
Coordinate obtains the transformation matrix between bank card graphic template and bank card picture, to realize accurately obtaining to transformation matrix
It takes, ensure that picture correction result accuracy with higher.
With reference to Fig. 4, Fig. 4 is the flow diagram of bank card picture antidote 3rd embodiment of the present invention.
Based on the various embodiments described above, in the present embodiment, the step S203 be may particularly include:
Step S2031: according to the base position coordinate and the matching position coordinate, the matching position is sat in acquisition
Mark is transformed to corresponding transformation parameter when the base position coordinate；
It should be understood that terminal the base position coordinate (x, y) for getting a certain characteristic point and with this feature point phase
After the matching position coordinate (x ', y ') of matched another feature point, it can calculate and the matching position coordinate is transformed to institute
State corresponding transformation parameter when the coordinate of base position.
For example, terminal calculates x=m according to base position coordinate (x, y) and matching position coordinate (x ', y ')11* x '+
m12* y '+m13, y=m21*x+m22*y+m23, then the transformation parameter is [m11, m12, m13, m21, m22, m23], and the transformation is joined
In number, " m13”、“m23" it is translation parameters, " m11”、“m12”、“m21" and " m22" it is then rotation parameter or zooming parameter, usual feelings
Under condition, rotation parameter is indicated using trigonometric function (cos or sin).
Step S2032: the characteristic points of all successful match is traversed to the characteristic point to obtain successful match to corresponding change
Change parameter；
It should be understood that bank card pattern it is generally relatively fixed, generally comprised by taking Interlink Card as an example, on card credit card issuer,
The content informations such as bank's card number, validity date, Unionpay logo, currency type, and the different corresponding characteristic points of content information all it is each not
It is identical, but the common content information that Interlink Card possesses is exactly above-mentioned Unionpay logo, and the position of Unionpay logo is in Interlink Card
It is changeless, therefore terminal, can be unlike its in acquisition picture after obtaining the bank card picture wait correct in the present embodiment
The characteristic point of its content need to only obtain the characteristic point of the Unionpay logo, and correspondingly, the bank card graphic template is corresponding
Reference characteristic point concentrates the characteristic point that also need to only store Unionpay logo, thus work when greatly simplifying Feature point recognition and extracting
Amount greatly improves picture and corrects efficiency.
In the concrete realization, terminal can characteristic point to all successful match to traversing, to obtain these characteristic points
To corresponding transformation parameter.
Step S2033: it is constructed between the bank card graphic template and the bank card picture according to the transformation parameter
Transformation matrix.
It should be understood that the last line in the transformation matrix is fixed as 0,0,1, it is generally the case that characteristic point and spy
Transformation between sign point is realized by 3 × 3 matrixes, such as (x ', y ') is transformed to the specific calculating process of (x, y) are as follows:
In above formula, by m11、m12、m13Matrix, that is, transformation matrix of equal elements building, due to last in above-mentioned matrix
The transformation matrix that row is fixed as 0,0,1, therefore 3 × 3 can be reduced to 2 × 3 matrix.In addition, it should be noted that, the present embodiment
And the transformation matrix in the various embodiments described above for carrying out affine transformation to bank card picture is by each characteristic point to corresponding son
Father's transformation matrix that transformation matrix is constituted.
The present embodiment is obtained according to base position coordinate and matching position coordinate by position on the basis of matching position coordinate transform
Set corresponding transformation parameter when coordinate；The characteristic points of all successful match is traversed to the characteristic point to obtain successful match to correspondence
Transformation parameter；The transformation matrix between bank card graphic template and bank card picture, the present embodiment are constructed according to transformation parameter
Corresponding transformation parameter and being constructed according to transformation parameter becomes when by obtaining matching position coordinate transform being benchmark position coordinates
Matrix is changed, ensure that acquisition all obtains transformation matrix accuracy with higher and confidence level.
In addition, the embodiment of the present invention also proposes a kind of storage medium, it is stored with bank card picture on the storage medium and rectifys
Positive program, the bank card picture correction program realize bank card picture antidote as described above when being executed by processor
The step of.
It is the structural block diagram of bank card picture apparatus for correcting first embodiment of the present invention referring to Fig. 5, Fig. 5.
As shown in figure 5, the bank card picture apparatus for correcting that the embodiment of the present invention proposes includes:
Picture obtains module 501, for obtaining bank card picture and the local bank card graphic template that prestores；
Characteristic matching module 502, for carrying out characteristic point to the bank card picture according to the bank card graphic template
Matching, and the transformation matrix between the bank card graphic template and the bank card picture is obtained according to matching result；
Picture rectification module 503 is obtained for carrying out affine transformation to the bank card picture according to the transformation matrix
Target bank card picture after correction.
The present embodiment passes through acquisition bank card picture and the bank card graphic template locally prestored；According to bank card picture
Template carries out Feature Points Matching to bank card picture, and according to matching result obtain bank card graphic template and bank card picture it
Between transformation matrix；Affine transformation is carried out to bank card picture further according to transformation matrix, the target bank card figure after obtaining correction
Piece, since the present embodiment is to carry out Feature Points Matching to bank card picture according to pre-set bank card graphic template, then
Transformation matrix is constructed according to matching result, after carrying out affine transformation to bank card picture further according to transformation matrix to obtain correction
Target bank card picture is corrected so as to the bank card picture to all kinds of shooting irregularities, ensure that subsequent to bank
The smooth extraction of card information.
Based on the above-mentioned bank card picture apparatus for correcting first embodiment of the present invention, bank card picture correction dress of the present invention is proposed
The second embodiment set.
In the present embodiment, the characteristic matching module 502 is also used to carry out characteristic point to the bank card graphic template
It extracts, to obtain the corresponding reference characteristic point set of the bank card graphic template；Characteristic point is carried out to the bank card picture to mention
It takes, to obtain the corresponding feature point set to be matched of the bank card picture；Using the reference characteristic point set as matching benchmark pair
The feature point set to be matched carries out Feature Points Matching.
Further, the characteristic matching module 502 is also used to determine the feature of successful match according to the matching result
Point pair, the characteristic point centering include reference characteristic point and target characteristic point to be matched corresponding to the reference characteristic point；It obtains
Reference characteristic point base position coordinate locating in the bank card graphic template and target feature to be matched
The corresponding matching position coordinate of point；The bank card picture is obtained according to the base position coordinate and the matching position coordinate
Transformation matrix between template and the bank card picture.
Further, the characteristic matching module 502 is also used to the silver of pre-configured orientation in the bank card graphic template
The frame of reference is established as coordinate origin in row card vertex；It is obtained locating for the reference characteristic point based on the frame of reference
Base position coordinate；By the bank card picture on the corresponding bank card vertex of the pre-configured orientation and the coordinate origin pair
Together, and the matching position locating in the frame of reference of target characteristic point to be matched described in the bank card picture is obtained
Coordinate.
Further, the characteristic matching module 502 is also used to according to the base position coordinate and the matching position
Coordinate obtains corresponding transformation parameter when the matching position coordinate is transformed to the base position coordinate；Traverse all
With successful characteristic point to the characteristic point to obtain successful match to corresponding transformation parameter；Institute is constructed according to the transformation parameter
State the transformation matrix between bank card graphic template and the bank card picture.
Further, the picture rectification module 503 is also used to according to the translation parameters to the characteristic point to be matched
The characteristic point of concentration is translated, the characteristic point after obtaining translation；And/or according to the rotation parameter to the feature to be matched
The characteristic point that point is concentrated is rotated, and postrotational characteristic point is obtained；And/or according to the zooming parameter to the spy to be matched
The characteristic point that sign point is concentrated zooms in and out, the characteristic point after obtaining scaling；According to after the translation characteristic point, after the rotation
Characteristic point and/or the scaling after characteristic point generate correction after target bank card picture.
Further, bank card picture apparatus for correcting described in the present embodiment further includes condition detection module, the condition inspection
Module is surveyed, for the bank card picture to be converted to gray level image, the bank card picture is extracted according to the gray level image
In bank card profile；The corresponding template contours of the bank card graphic template locally prestored are read, according to the template wheel
Exterior feature detects whether the bank card profile meets pre-set image correction condition；If satisfied, then according to the bank card graphic template
Feature Points Matching is carried out to the bank card picture.
It is real that the other embodiments or specific implementation of bank card picture apparatus for correcting of the present invention can refer to above-mentioned each method
Example is applied, details are not described herein again.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as read-only memory/random access memory, magnetic disk, CD), including some instructions are used so that a terminal device (can
To be mobile phone, computer, server, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of bank card picture antidote, which is characterized in that the described method includes:
The bank card graphic template for obtaining bank card picture and locally prestoring；
Feature Points Matching is carried out to the bank card picture according to the bank card graphic template, and institute is obtained according to matching result
State the transformation matrix between bank card graphic template and the bank card picture；
Affine transformation is carried out to the bank card picture according to the transformation matrix, the target bank card picture after obtaining correction.
2. method as described in claim 1, which is characterized in that it is described according to the bank card graphic template to the bank card figure
Piece carries out the step of Feature Points Matching, comprising:
Feature point extraction is carried out to the bank card graphic template, to obtain the corresponding reference characteristic of the bank card graphic template
Point set；
Feature point extraction is carried out to the bank card picture, to obtain the corresponding feature point set to be matched of the bank card picture；
Feature Points Matching is carried out to the feature point set to be matched using the reference characteristic point set as matching benchmark.
3. method as claimed in claim 2, which is characterized in that it is described according to matching result obtain the bank card graphic template and
The step of transformation matrix between the bank card picture, comprising:
Determine the characteristic point pair of successful match according to the matching result, the characteristic point centering includes reference characteristic point and described
Target corresponding to reference characteristic point characteristic point to be matched；
The reference characteristic point base position coordinate and the target locating in the bank card graphic template is obtained to wait for
The corresponding matching position coordinate of matching characteristic point；
The bank card graphic template and the bank card are obtained according to the base position coordinate and the matching position coordinate
Transformation matrix between picture.
4. method as claimed in claim 3, which is characterized in that described to obtain the reference characteristic point in the bank card picture mould
In plate the step of locating base position coordinate and target characteristic point to be matched corresponding matching position coordinate, comprising:
The frame of reference is established as coordinate origin using the bank card vertex of pre-configured orientation in the bank card graphic template；
Base position coordinate locating for the reference characteristic point is obtained based on the frame of reference；
The bank card picture is aligned on the corresponding bank card vertex of the pre-configured orientation with the coordinate origin, and obtains institute
State the characteristic point to be matched of target described in bank card picture matching position coordinate locating in the frame of reference.
5. method as claimed in claim 3, which is characterized in that described to be sat according to the base position coordinate and the matching position
Mark obtains the step of transformation matrix between the bank card graphic template and the bank card picture, comprising:
According to the base position coordinate and the matching position coordinate, obtains and the matching position coordinate is transformed to the base
Corresponding transformation parameter when quasi- position coordinates；
The characteristic points of all successful match is traversed to the characteristic point to obtain successful match to corresponding transformation parameter；
The transformation matrix between the bank card graphic template and the bank card picture is constructed according to the transformation parameter.
6. method as claimed in claim 5, which is characterized in that in the transformation parameter comprising translation parameters, rotation parameter and/or
Zooming parameter；
It is described that affine transformation is carried out to the bank card picture according to the transformation matrix, the target bank card figure after obtaining correction
The step of piece, comprising:
The characteristic point in the feature point set to be matched is translated according to the translation parameters, the feature after obtaining translation
Point；And/or
The characteristic point in the feature point set to be matched is rotated according to the rotation parameter, obtains postrotational feature
Point；And/or
The characteristic point in the feature point set to be matched is zoomed in and out according to the zooming parameter, the feature after obtaining scaling
Point；
Correction is generated according to the characteristic point after characteristic point, the postrotational characteristic point and/or the scaling after the translation
Target bank card picture afterwards.
7. such as any one of claim 1 to 6 the method, which is characterized in that it is described according to the bank card graphic template to institute
Before stating the step of bank card picture carries out Feature Points Matching, the method also includes:
The bank card picture is converted into gray level image, the bank in the bank card picture is extracted according to the gray level image
Card wheel is wide；
The corresponding template contours of the bank card graphic template locally prestored are read, detect the silver according to the template contours
Whether row card wheel exterior feature meets pre-set image correction condition；
If satisfied, then executing the step for carrying out Feature Points Matching to the bank card picture according to the bank card graphic template
Suddenly.
8. a kind of bank card picture apparatus for correcting, which is characterized in that described device includes:
Picture obtains module, for obtaining bank card picture and the local bank card graphic template that prestores；
Characteristic matching module, for carrying out Feature Points Matching to the bank card picture according to the bank card graphic template, and
The transformation matrix between the bank card graphic template and the bank card picture is obtained according to matching result；
Picture rectification module, for carrying out affine transformation to the bank card picture according to the transformation matrix, after obtaining correction
Target bank card picture.
9. a kind of bank card picture correcting device, which is characterized in that the equipment includes: memory, processor and is stored in institute
The bank card picture correction program that can be run on memory and on the processor is stated, the bank card picture correction program is matched
It is set to the step of realizing the bank card picture antidote as described in any one of claims 1 to 7.
10. a kind of storage medium, which is characterized in that be stored with bank card picture correction program, the silver on the storage medium
Row card picture correction program realizes bank card picture as described in any one of claim 1 to 7 correction side when being executed by processor
The step of method.
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Application publication date: 20190730 |