CN102568081A - Image acquisition and processing method and device of paper money discriminator - Google Patents
Image acquisition and processing method and device of paper money discriminator Download PDFInfo
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Abstract
The invention discloses an image acquisition and processing method of a paper money discriminator. The image acquisition and processing method comprises the following steps of: (a) acquiring a paper money image line by line by using a linear array image sensor; (b) performing analog-digital conversion on the acquired paper money image by using an image digitalization module and correcting a digital signal after conversion; (c) outputting the corrected digital signal to a digital signal processor to detect the paper money image; and (d) controlling stop and start of a paper money transmission motor when non-abnormal paper money is detected, wherein a process of acquiring the paper money image is controlled by using a coded disc signal in the step (a). The invention also discloses an image acquisition and processing device of the paper money discriminator, wherein the image acquisition and processing device comprises the linear array image sensor, the image digitalization module, the digital signal processor, the paper money transmission motor and the image acquisition control module; the linear array image sensor is used for acquiring the paper money image line by line; the image digitalization module is used for performing analog-digital conversion and signal correction; the digital signal processor is used for performing paper money image detection, the paper money transmission motor is used for controlling the paper money transmission; and the image acquisition control module is used for controlling the process of acquiring the paper money image by using the coded disc signal.
Description
Technical field
The present invention relates to a kind of paper banknote identifier image acquisition and processing method, also relate to a kind of paper banknote identifier image acquisition and processing device, particularly be used for the paper banknote identifier image acquisition and processing method and the device of single port form output bank note.
Background technology
Along with expanding economy, safeguard that the interests of financial order and society become more and more important, how to be strictly on guard against that counterfeit money comes into the market, more and more cause the concern of Financial Management mechanism and society.The counterfeit money recognition capability of utilizing image processing techniques to improve paper banknote identifier is a kind of effective means.On September 26th, 2010, country issued " Renminbi discriminating machine for fake RMB general technical specifications ", and the coming years, the bill handling apparatus of all banks all need possess image identification function.The paper banknote identifier of single port output bank note has little, the low cost and other advantages of volume like paper money counter, cash inspecting machine, receives the welcome of units such as bank, supermarket.
The paper banknote identifier of the single port output bank note of prior art can be shut down when running into improper bank note, exports improper bank note.Have a tensioning this moment with thereafter normal or improper bank note, under the incomplete situation of IMAQ owing to paper banknote identifier stops to be stuck in paper banknote identifier inside.The paper banknote identifier of prior art needs artificial the taking-up to be somebody's turn to do by the paperboard coin.After starting paper banknote identifier once more, be reentered into bank note, carry out bank note and differentiate operation.This kind paper banknote identifier can not be gathered in banknote image and restart continued collection splicing banknote image under the incomplete situation, and need take out bank note and be reentered into and carry out the banknote image collecting work again, inconvenient operation, time-consuming again.
On the other hand; The line scan image sensor of the paper banknote identifier of prior art; Like CIS (contact image sensor; Contact-type image sensor) sensor restart continued collection splicing banknote image under the incomplete situation even its characteristic that continues exposure makes paper banknote identifier to gather in banknote image, but tangible light and shade sudden change can appear in the complete banknote image that is spliced into thus; Have a strong impact on the quality of the banknote image of collection, be prone to make paper banknote identifier identification note image to produce the erroneous judgement behavior.
Summary of the invention
Technical matters to be solved by this invention is to propose a kind of paper banknote identifier image acquisition and processing method, utilizes this method can realize the control that banknote image is gathered effectively, and is reliable, complete, obtain banknote image to high-quality; The present invention also proposes a kind of paper banknote identifier image acquisition and processing device; Using need not to uncap in the bank note discrimination process behind this device takes out by the paperboard coin; Can be after only need restarting to being proceeded the banknote image acquisition process by the paperboard coin; And picture quality is excellent, does not have light and shade sudden change situation, install easy to operate, save time, fast.
For solving the problems of the technologies described above, the present invention proposes a kind of paper banknote identifier image acquisition and processing method, comprises a) adopting line scan image sensor to obtain banknote image line by line; B) adopt of the banknote image analog to digital conversion of image digitazation module, and the digital signal after the conversion is carried out treatment for correcting being obtained; C) digital signal behind the output calibration is carried out the banknote image detection to digital signal processor; And d) stall and the startup of control bank note driving motor when detecting improper bank note; Wherein utilize the code-disc signal that the process of obtaining banknote image is controlled in the step a).
In the said method, the described process of obtaining banknote image is controlled comprises: exposure is controlled to line scan image sensor; And the collection of every capable image controlled.
In the said method, described line scan image sensor exposure is controlled comprises: light source luminescent is controlled; And the line scan image sensor photoelectric integration controlled.
In the said method; The described process of obtaining banknote image is controlled also comprises: make public when surpassing setting-up time T to time interval that the photoelectric integration electric charge of this time exposure begins to read from unlatching; Insert the exposure of primary line array image sensor; Concrete steps comprise n line period T0 of code-disc signal P0 time-delay, obtain code-disc signal Pn (n is＞=1 integer); Each code-disc signal Pn triggering collection delegation banknote image; And each code-disc signal P0 is when arriving, if to the time width of a last code-disc signal P0 during greater than setting-up time T, and release line array image sensor photoelectric integration, and open light source luminescent.
In the said method, described code-disc signal Pn triggering collection image may further comprise the steps: release line array image sensor photoelectric integration; Open light source luminescent, wherein fluorescent lifetime preestablishes; Banknote image to line scan image sensor obtains is carried out analog to digital conversion; And the digital signal after the conversion carried out treatment for correcting.
In the said method, also comprise following at least a banknote image pixel order method of adjustment: during segmentation output line array image sensor, the banknote image pixel is sorted; And about line scan image sensor during anti-dress, adjustment banknote image pixel output order.
Solve the problems of the technologies described above for implementing said method; The present invention also proposes a kind of paper banknote identifier image acquisition and processing device, comprising: be used for obtaining line by line banknote image line scan image sensor, be used for analog to digital conversion and signal correction the image digitazation module, be used for digital signal processor that banknote image detects, be used to the IMAQ control module controlling the bank note driving motor of bank note transmission and utilize the code-disc signal that the process of obtaining banknote image is controlled.
In the said apparatus, described IMAQ control module comprises following IMAQ control circuit: be used for the capable IMAQ control circuit that obtains code-disc signal Pn (n is＞=1 integer) with code-disc signal P0 time-delay n; Be used for IMAQ control circuit with each code-disc signal Pn triggering collection delegation banknote image; And when being used for each code-disc signal P0 arrived, if to a last code-disc signal P0 interval greater than setting-up time T the time, release line array image sensor photoelectric integration and the IMAQ control circuit of opening light source luminescent.
In the said apparatus, described code-disc signal Pn triggering collection image may further comprise the steps: release line array image sensor photoelectric integration; Open light source luminescent, wherein fluorescent lifetime preestablishes; Banknote image to line scan image sensor obtains is carried out analog to digital conversion; And the digital signal after the conversion carried out treatment for correcting.
In the said apparatus, also comprise following at least a banknote image pixel order adjustment circuit: the order adjustment circuit that when being used for segmentation output line array image sensor pixel is sorted; And when being used for about line scan image sensor anti-dress, the order adjustment circuit of adjustment pixel output order.
Beneficial effect: utilize the code-disc signal that the process of obtaining banknote image is controlled; Make control procedure more accurate; The more important thing is and have better adaptability; Can deal with more situation, like the stall and the startup of control bank note driving motor when detecting improper bank note, above-mentioned control method can well be dealt with this situation.
Utilize the code-disc signal that the process of obtaining banknote image is controlled, can deal with the unexpected stall of bank note driving motor and the incomplete situation of collection banknote image that causes.After adopting this control method, even after device is restarted, by the paperboard coin still can by high-quality carry out the banknote image acquisition process, put into again and need not artificial the taking-up.
Exposure is controlled and the collection of every capable image is controlled to line scan image sensor; The benefit of doing like this is: can avoid long problem of line scan image sensor time shutter; So just can be so that the banknote image better quality of obtaining is more suitable for doing image detection.After adopting this control method, tangible light and shade sudden change situation can not appear in the banknote image acquisition process.
Light source luminescent is controlled and the line scan image sensor photoelectric integration is controlled; The benefit of doing like this is: also can avoid long problem of line scan image sensor time shutter; So just can be so that the banknote image better quality of obtaining is more suitable for doing image detection.After adopting this control method, tangible light and shade sudden change situation can not appear in the banknote image acquisition process.
In sum, the paper banknote identifier image acquisition and processing method that adopts the present invention to propose can be realized control that banknote image is gathered effectively, and is reliable, complete, obtain banknote image to high-quality.The paper banknote identifier image acquisition and processing device that adopts the present invention to propose; Using need not to uncap in the bank note discrimination process behind this device takes out by the paperboard coin; Can be after only need restarting to being proceeded the banknote image acquisition process by the paperboard coin; And picture quality is excellent, does not have light and shade sudden change situation, install easy to operate, save time, fast.
Description of drawings
In conjunction with accompanying drawing, other characteristics of the present invention and advantage can become clearer from the explanation of following preferred implementation of coming by way of example principle of the present invention is made an explanation.
Fig. 1 is the process flow diagram of an embodiment of image acquisition and processing method among the present invention;
Fig. 2 is the theory diagram that utilizes the code-disc signal that the process of obtaining banknote image is controlled in the one embodiment of the invention;
Fig. 3 is the structural representation of an embodiment of image acquisition and processing device among the present invention.
Embodiment
To combine accompanying drawing that embodiment of the present invention is described in detail below:
Fig. 1 is the process flow diagram of an embodiment of image acquisition and processing method among the present invention, may further comprise the steps:
Step 1: adopt line scan image sensor to obtain banknote image S108 line by line.Line scan image sensor can be used CIS (contact image sensor; Contact-type image sensor) sensor, CCD (Charge-coupled Device; Charge coupled cell) sensor or CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)) sensor.Can use FPGA (Field Programmable Gate Arrayz; Field programmable gate array) or the coherent signals such as exposure, photoelectric integration and output clock of CPLD (Complex Programmable Logic Device, CPLD) control CIS sensor.When obtaining banknote image line by line, the illumination mode of light source can change by behavior unit, as adopting illumination modes such as white light transmission, white light reflection, infrared transmission, infrared external reflection, ultraviolet reflectance, various reflection of monochromatic light or transmission.Line scan image sensor can be gathered the different banknote image of making public line by line.
Utilize the code-disc signal that the process of obtaining banknote image is controlled S102.Comprise that S103 is controlled in exposure to line scan image sensor; And the collection of every capable image controlled S104.Wherein line scan image sensor exposure is controlled and comprised light source luminescent is controlled S105 and the line scan image sensor photoelectric integration is controlled S106.Wherein to light source luminescent control be meant when gathering every capable banknote image the control light source begin luminous with finish luminous.Wherein the line scan image sensor photoelectric integration is controlled the sensitization commencing signal that is meant the control line array image sensor; The electric charge in the photosensitive unit (pixel) in the line scan image sensor is read and emptied to this signal, though also lastrow the signal of sensitization can be read.
Utilize the code-disc signal that the process of obtaining banknote image is controlled, be based on the code-disc signal of corresponding bank note transmission.Mainly be to utilize the code-disc signal to adjust.Code-disc is a kind of increment type angular transducer commonly used, utilizes photoetching technique even groove on disk, when disk rotate, receives groove to influence the light that receiving tube receives and bright dark variation occurs, and output is the level of saltus step just.Usually, the corresponding n/m image line of code-disc signal, wherein m, n are positive integer.Can utilize code-disc signal frequency multiplication, frequency division to obtain banknote image horizontal pulse signal, utilize the collection of this horizontal pulse signal enabling line scan image sensor exposure and every capable image.Because this horizontal pulse signal from the code-disc signal, equals at 1 o'clock at n/m, is exactly code-disc signal itself, the horizontal pulse signal that therefore following code-disc signal general reference utilizes the code-disc signal to obtain.
When code-disc is installed on the motor, during the motor rotation, just there is pulse signal to export from photosensitive circuit.That is to say that every transmission one segment distance of bank note just exports a pulse signal, the pulse signal of this output can be converted into the bank note transmitting range, thereby reaches vertical SI of utilizing code-disc output pulse signal control bank note.
In order to obtain the better pictures quality; Need further detecting improper bank note; In the stall of bank note driving motor, this time period of restarting, utilize the code-disc signal that the process of obtaining banknote image is controlled, particularly a process of obtaining banknote image that is stuck in the normal or improper bank note in the driving motor immediately following thereafter of detected improper coin is controlled; Thereby the timing up of control line array image sensor, i.e. photoelectric integration time.Make public when surpassing setting-up time T to time interval that the photoelectric integration electric charge to this time exposure begins to read from unlatching, inserting the exposure of primary line array image sensor is S107.Usually, can directly make public, and when next code-disc signal arrives, begin to read with code-disc unblanking line scan image sensor.After the exposure of release line array image sensor; If read output signal is not arranged yet to setting-up time T; Then before read output signal, insert the exposure of primary line array image sensor; Promptly replace existing exposure with new exposure, avoid the banknote image mistake that causes because of timing up is long, Fig. 2 is the theory diagram that utilizes the code-disc signal that the process of obtaining banknote image is controlled in the one embodiment of the invention.As shown in Figure 2, concrete steps are following:
With n line period T0S203 of code-disc signal P0S202 time-delay, obtain code-disc signal PnS204.Wherein line period T0 is the minimum time that the every row of line scan image sensor is read to be needed; N is＞=1 integer; Size that n selects for use and bank note sweep velocity have correlativity, are T1 if under current bank note sweep velocity, transmit the averaging time of every capable banknote image data, so usually; N=(T1/T0+1), wherein n rounds forward.Do the image that to avoid collecting like this and the sudden change of full line light and shade occurs.
Each above-mentioned Pn signal triggering is gathered delegation's banknote image, specifically comprises: release line array image sensor photoelectric integration and unlatching light source luminescent, and wherein fluorescent lifetime preestablishes S205; Banknote image to line scan image sensor obtains is carried out analog to digital conversion S206; And the digital signal after the conversion carried out treatment for correcting S207.Wherein said release line array image sensor photoelectric integration is exactly to send out the signal SI that the line scan image sensor integration begins, the beginning of be used to make last end exposure, removing last sensitization electric charge and banknote image sensitization next time.
S208 when each code-disc signal P0 arrives, if to the time width of last code-disc signal P0 S209 during greater than setting-up time T, release line array image sensor photoelectric integration with open light source luminescent S210.The light source luminescent time preestablishes.
The signal SI that this release line array image sensor photoelectric integration obtains is used for the removing of last line scan image sensor sensitization electric charge and the beginning of banknote image sensitization next time; Promptly the electric charge of sensitization (signal) is not utilized; Be because this time is long timing up; Surround lighting or dark current disturb bigger, need carry out single exposure again.
Step 2: to by the banknote image analog to digital conversion S109 that obtained, and the digital signal after the conversion carried out treatment for correcting S110.To digital signal correction is that each the banknote image pixel that collects is carried out gray correction and ordering.Reasons such as the sensitization susceptibility of, line scan image sensor each light-sensitive image vegetarian refreshments even owing to uneven illumination and black level are inconsistent, the banknote image that collects has serious gray scale inconsistency, must carry out gray correction, could obtain correct banknote image.Above-mentioned gray correction is meant carries out linearity or nonlinear transformation to the banknote image of being gathered.To the analog output value of line scan image sensor, the banknote image of promptly being obtained is proofreaied and correct after analog to digital conversion specifically, makes it correctly to reflect banknote image information.Specific practice is the banknote image sampling of obtaining of the quilt to line scan image sensor output, quantize after, linearity or nonlinear transformation compensation are carried out in its bright output and dark output.If the line scan image sensor output valve is made up of several sections line scan image sensors, each section line scan image sensor can be exported simultaneously, after digitizing, just need sort, and makes it by banknote image pixel order output banknote image information.At least a banknote image pixel order method of adjustment below the employing: during segmentation output line array image sensor, to the banknote image pixel S114 that sorts; And about line scan image sensor during anti-dress, adjustment banknote image pixel output order S115.
Step 3: the banknote image behind the output calibration is carried out banknote image to digital signal processor and is detected S111.Digital signal processor can adopt special-purpose DSP (digital signal processor, digital signal processor) or general processor.The banknote image detection method can adopt existing image-recognizing method, as adopting the method for images match such as gray scale coupling and characteristic matching.Wherein the gray scale coupling comprises the similarity degree that utilizes between Error Absolute Value and the judgement image; Characteristic matching comprises textural characteristics, shape facility etc., or utilizes angle point, marginal point etc. to mate.
Step 4: the stall and startup S113 of S112 control bank note driving motor when detecting improper bank note.Improper bank note comprises the bank note of suspicious counterfeit money, breakage, stained, flanging, needs letter sorting such as too outmoded.Improper bank note is taken out in the stall of bank note driving motor when detecting improper bank note, restarts the bank note driving motor.
Shown in Figure 3 is the structural representation of an embodiment of image acquisition and processing device among the present invention.Embodiment comprises: be used for obtaining line by line banknote image line scan image sensor 301, be used for analog to digital conversion and signal correction image digitazation module 302, be used for digital signal processor 303 that banknote image detects, be used to the IMAQ control module 305 controlling the bank note driving motor 304 of bank note transmission and utilize the code-disc signal that the process of obtaining banknote image is controlled.
Wherein line scan image sensor is selected the CIS sensor in the present embodiment for use, can be other line scan image sensor.
The IMAQ control module utilizes the code-disc signal that the process of obtaining banknote image is controlled, and comprises the acquisition controlling of carrying out line scan image sensor exposure control and every capable image.The code-disc signal produces with code-disc photosensitive circuit (comprising shaping circuit).This IMAQ control module can be realized by circuit such as FPGA or CPLD.The IMAQ control module comprises following IMAQ control circuit: be used for the capable IMAQ control circuit 306 that obtains code-disc signal Pn (n is＞=1 integer) with code-disc signal P0 time-delay n; Be used for IMAQ control circuit 307 with each code-disc signal Pn triggering collection delegation banknote image; And when being used for each code-disc signal P0 arrived, if to a last code-disc signal P0 interval greater than setting-up time T the time, release line array image sensor photoelectric integration and the IMAQ control circuit 308 of opening light source luminescent.
The image digitazation module; Comprise the circuit of realizing analog to digital conversion function and correction function; The analog to digital conversion function can be used high-speed ADC (the Analog to Digital Converter more than one or more ten; Analog-digital converter) realizes, decide the quantity of ADC according to the number of channels of the segmentation of line scan image sensor and ADC.
Digital signal processor can adopt general digital signal processor DSP (Digital Signal Processing; Digital signal processing); DSP like TI company (Texas Instruments, Texas Instruments), ADI company (Analog Device Inc, Ya De promise semiconductor technology company); Be to adopt the DSP that handles to video image more easily, like the Davinci (Leonardo da Vinci) of TI company or the Blackfin of ADI company (black fin) series processors.Digital signal processor also can adopt other flush bonding processor; Like x86 (Intel of Intel at first develops the general term of a kind of micro-processor architecture of manufacturing), ARM (Advanced RISC Machines; Senior simple instruction set processor) or series processors such as MIPS (Microprocessor without interlocked piped stages does not have the microprocessor of inner interlocking pipelining-stage).
The bank note driving motor can adopt flush bonding processor or other circuit to realize, like processors such as ARM, MIPS, also can share processor with digital signal processor.
Present embodiment also comprises pixel order adjustment circuit 309, when being used for segmentation output line array image sensor, pixel is sorted.Comprise when the order that when being used for segmentation output line array image sensor pixel is sorted is adjusted circuit and is used for about line scan image sensor, instead adorning adjustment pixel output order adjustment circuit in proper order.Concrete operations are following: line scan image sensor segmentation output data; The IMAQ control module of importing compositions such as FPGA or CPLD through the analog to digital conversion of ADC (can adopt built-in RAM (random access memory when adopting FPGA; Random access memory) buffered data; When using CPLD, generally need be equipped with external RAM), through the address that control write or read RAM, obtain banknote image by the output of line scan image sensor pixel order.
Though described embodiment of the present invention in conjunction with accompanying drawing, those of ordinary skills can make various distortion or modification within the scope of the appended claims.
Claims (10)
1. paper banknote identifier image acquisition and processing method is characterized in that may further comprise the steps:
A) adopt line scan image sensor to obtain banknote image line by line;
B), and the digital signal after the conversion carried out treatment for correcting to by the banknote image analog to digital conversion of being obtained;
C) digital signal behind the output calibration is carried out the banknote image detection to digital signal processor; And
D) stall and the startup of control bank note driving motor when detecting improper bank note; Wherein,
Step a) utilizes the code-disc signal that the process of obtaining banknote image is controlled.
2. image acquisition and processing method according to claim 1 is characterized in that the described process of obtaining banknote image is controlled comprises: exposure is controlled to line scan image sensor; And the collection of every capable image controlled.
3. image processing method according to claim 2 is characterized in that described line scan image sensor exposure is controlled comprises: light source luminescent is controlled; And the line scan image sensor photoelectric integration controlled.
4. image acquisition and processing method according to claim 1; It is characterized in that the described process of obtaining banknote image is controlled also comprises: make public when surpassing setting-up time T to time interval that the photoelectric integration electric charge of this time exposure begins to read from unlatching; Insert the exposure of primary line array image sensor, concrete steps do
With n line period T0 of code-disc signal P0 time-delay, obtain code-disc signal Pn (n is＞=1 integer);
Each code-disc signal Pn triggering collection delegation banknote image; And
When each code-disc signal P0 arrives, if to the time width of a last code-disc signal P0 during greater than setting-up time T, release line array image sensor photoelectric integration with open light source luminescent.
5. image acquisition and processing method according to claim 4 is characterized in that described code-disc signal Pn triggering collection banknote image may further comprise the steps:
Release line array image sensor photoelectric integration;
Open light source luminescent, wherein fluorescent lifetime preestablishes;
Banknote image to line scan image sensor obtains is carried out analog to digital conversion; And
Digital signal after the conversion is carried out treatment for correcting.
6. image acquisition and processing method according to claim 1 is characterized in that also comprising following at least a banknote image pixel order method of adjustment:
During segmentation output line array image sensor, the banknote image pixel is sorted; And
When about line scan image sensor, instead adorning, adjustment banknote image pixel output order.
7. paper banknote identifier image acquisition and processing device is characterized in that comprising: be used for obtaining line by line banknote image line scan image sensor, be used for analog to digital conversion and signal correction the image digitazation module, be used for digital signal processor that banknote image detects, be used to the IMAQ control module controlling the bank note driving motor of bank note transmission and utilize the code-disc signal that the process of obtaining banknote image is controlled.
8. image acquisition and processing device according to claim 7 is characterized in that described IMAQ control module comprises following IMAQ control circuit:
Be used for the capable IMAQ control circuit that obtains code-disc signal Pn (n is＞=1 integer) with code-disc signal P0 time-delay n;
Be used for IMAQ control circuit with each code-disc signal Pn triggering collection delegation banknote image; And
When being used for each code-disc signal P0 arrived, if to a last code-disc signal P0 interval greater than setting-up time T the time, release line array image sensor photoelectric integration and the IMAQ control circuit of opening light source luminescent.
9. image acquisition and processing device according to claim 8 is characterized in that described code-disc signal Pn triggering collection image may further comprise the steps:
Release line array image sensor photoelectric integration;
Open light source luminescent, wherein fluorescent lifetime preestablishes;
Banknote image to line scan image sensor obtains is carried out analog to digital conversion; And
Digital signal after the conversion is carried out treatment for correcting.
10. image acquisition and processing device according to claim 7 is characterized in that also comprising following at least a banknote image pixel order adjustment circuit:
The order adjustment circuit that when being used for segmentation output line array image sensor pixel is sorted; And
When being used for about line scan image sensor, instead adorning, the order adjustment circuit of adjustment pixel output order.
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