CN105243726A - Method and device for acquiring digital image data - Google Patents
Method and device for acquiring digital image data Download PDFInfo
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- CN105243726A CN105243726A CN201410330979.9A CN201410330979A CN105243726A CN 105243726 A CN105243726 A CN 105243726A CN 201410330979 A CN201410330979 A CN 201410330979A CN 105243726 A CN105243726 A CN 105243726A
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Abstract
The invention discloses a method and a device for acquiring digital image data. The method comprises the steps as follows: opening an ultraviolet light source after an Mth horizontal synchronizing signal is sent to an image sensor, wherein the ultraviolet light source is used for illuminating a bill to be scanned to enable the image sensor to collect an ultraviolet image of the bill to be scanned, and M is a positive integer; starting first timing when an (M+N)th horizontal synchronizing signal is sent to the image sensor, and closing the ultraviolet light source when timing of a first preset time length is completed through the first timing, wherein N is a positive integer, and the first preset time length is greater than the pulse width of the (M+N)th horizontal synchronizing signal and smaller than the working cycle of the (M+N)th horizontal synchronizing signal; and acquiring ultraviolet digital image data corresponding to the working cycle of the (M+N)th horizontal synchronizing signal. According to the technical scheme of the invention, fluorescent fibers contained in the bill can be clearly displayed in a digital image, and the brightness of the background part of the digital image except the fluorescent fibers is not affected.
Description
Technical field
The present invention relates to image processing field, in particular to a kind of acquisition methods and device of Digital Image Data.
Background technology
Financial document is signed and issued by financial institution or born the bill paying obligation by financial institution, and the existing financial document of China comprises: draft, check, cashier's cheque etc.At present, the false proof mode of financial document (hereinafter referred to as bill) mainly gathers the image of bill by financial document image-reading device (hereinafter referred to as bill images fetch equipment), by the image of bill when paying and the image of bill when signing and issuing are carried out contrasting the true and false of decides bill.In recent years, some special bills strengthen the security feature of bill by embedding irregular fluorescent fiber silk in check paper, such as: China circulate now use 2010 editions acceptance bill check papers in be embedded with irregular fluorescent fiber silk, this fluorescent fiber silk is invisible under white light illumination, and can send the visible fluorescence of red, blue two kinds of colors under UV-irradiation.Carrying out bill false distinguishing by the fluorescent fiber silk embedded in detection check paper is a kind of means that current bill process field is commonly used, such as: utilize the ordered state data of the fluorescent fiber silk embedded in check paper to carry out the method for bill false distinguishing.
A kind of image-reading device and image reading method is provided in correlation technique, this image-reading device can comprise: imageing sensor, this imageing sensor can be charge-coupled image sensor (Charge-coupledDevice, referred to as CCD) or the linear transducer such as contact-type image sensor (ContactImageSensor, referred to as CIS).Imageing sensor can be arranged in media transport path, and it can comprise: illuminator and photosensitive array.Within each read cycle (READINGCYCLE) of image-reading device, illuminator luminescence (LIGHTSOURCEON) setting-up time, can realize the reading of the view data of some row pixels by the signal reading photosensitive array output in each read cycle.In each read cycle of this image-reading device, illuminator luminescence once, and the fluorescent lifetime that namely illuminator of this image-reading device is each is set to less than a read cycle.
But the fluorescent fiber silk of existing bill needs can send visible fluorescence under high-octane UV-irradiation.When the illuminator emitting ultraviolet light irradiation bill by making the image-reading device in correlation technique, during to obtain bill images thus to extract the fluorescent fiber silk feature of bill, what the maximum intensity of ultraviolet light of launching due to illuminator was subject to the maximum input current of illuminator is restricted to fixed value, therefore, when illuminator is each luminous, the energy of the ultraviolet light that it is launched is directly proportional to fluorescent lifetime, fluorescent lifetime is longer, and the energy of the ultraviolet light that illuminator is launched is higher.When using this image-reading device to obtain bill images, if each fluorescent lifetime of illuminator is shorter, due to its energy shortage of ultraviolet light launched cause fluorescent fiber silk cannot send fluorescence or the brightness of fluorescence that sends more weak, thus result through the fluorescent fiber silk feature that bill images that image-reading device obtains is difficult to extract bill; And if extend each fluorescent lifetime of illuminator, then need the read cycle of synchronous adjustment image-reading device, now, the energy accumulation causing photosensitive array to obtain because the read cycle is elongated makes the background parts in obtained bill images except fluorescent fiber silk also can brighten, namely the contrast of bill images that image-reading device obtains reduces, and causes the fluorescent fiber silk feature being difficult to extract bill.
Be difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill for the image reading method in correlation technique, not yet propose effective solution at present.
Summary of the invention
The invention provides a kind of acquisition methods and device of Digital Image Data, be difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill in the image reading mode at least solved in correlation technique.
According to an aspect of the present invention, a kind of acquisition methods of Digital Image Data is provided.
Acquisition methods according to the Digital Image Data of the embodiment of the present invention comprises: after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; When sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; Obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal.
Preferably, obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal and comprise: at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Preferably, reading and storing some row ultraviolet light Digital Image Data that AD converter exports comprises one of following: M line synchronizing signal to each line synchronizing signal of M+N line synchronizing signal work period at the end of read and store some line number digital image data of AD converter output, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making transmission M line synchronizing signal to M+N line synchronizing signal, only to store in storer at the end of the work period of M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored, only at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
According to a further aspect in the invention, the acquisition methods of another kind of Digital Image Data is provided.
Acquisition methods according to the Digital Image Data of the embodiment of the present invention comprises:
Step a:
After sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; When sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; Obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal;
Step b:
After sending a jth line synchronizing signal to imageing sensor, open white light source, and start the second timing when opening white light source, wherein, white light source is for irradiating bill to be scanned with the White-light image making imageing sensor gather bill to be scanned, and j is positive integer; Close white light source when the second timing arrives the second preset duration, wherein, the second preset duration is less than the work period of a jth line synchronizing signal; Obtain the White Light Digital view data corresponding with the work period of a jth line synchronizing signal;
Step c:
After sending a kth line synchronizing signal to imageing sensor, open infrared light light source, and start the 3rd timing when opening infrared light light source, wherein, infrared light light source is for irradiating bill to be scanned with the infrared light image making imageing sensor gather bill to be scanned, and k is positive integer; Close infrared light light source when the 3rd timing arrives the 3rd preset duration, wherein, the 3rd preset duration is less than the work period of a kth line synchronizing signal; Obtain the infrared light Digital Image Data corresponding with the work period of a kth line synchronizing signal.
Wherein, step a, step b and step c is performed according to random order.
Preferably, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
According to another aspect of the invention, a kind of acquisition device of Digital Image Data is provided.
Acquisition device according to the Digital Image Data of the embodiment of the present invention comprises: the first opening module, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; First closing module, for when sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; First acquisition module, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal.
Preferably, the first acquisition module, at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Preferably, first acquisition module comprises: the first acquiring unit, for M line synchronizing signal to each line synchronizing signal of M+N line synchronizing signal work period at the end of read and store AD converter export some line number digital image data, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making transmission M line synchronizing signal to M+N line synchronizing signal, only to store in storer at the end of the work period of M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored, second acquisition unit, for only at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
In accordance with a further aspect of the present invention, the acquisition device of another kind of Digital Image Data is provided.
Acquisition device according to the Digital Image Data of the embodiment of the present invention comprises: the second opening module, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; Second closing module, for when stating imageing sensor and sending M+N line synchronizing signal, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; Second acquisition module, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal; 3rd opening module, for after sending a jth line synchronizing signal to imageing sensor, open white light source, and start the second timing when opening white light source, wherein, white light source is for irradiating bill to be scanned with the White-light image making imageing sensor gather bill to be scanned, and j is positive integer; 3rd closing module, for closing white light source when the second timing arrives the second preset duration, wherein, the second preset duration is less than the work period of a jth line synchronizing signal; 3rd acquisition module, for obtaining the White Light Digital view data corresponding with the work period of a jth line synchronizing signal; 4th opening module, for after sending a kth line synchronizing signal to imageing sensor, open infrared light light source, and start the 3rd timing when opening infrared light light source, wherein, infrared light light source is for irradiating bill to be scanned with the infrared light image making imageing sensor gather bill to be scanned, and k is positive integer; 4th closing module, for closing infrared light light source when the 3rd timing arrives the 3rd preset duration, wherein, the 3rd preset duration is less than the work period of a kth line synchronizing signal; 4th acquisition module, for obtaining the infrared light Digital Image Data corresponding with the work period of a kth line synchronizing signal.
Preferably, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
By the embodiment of the present invention, adopt after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; When sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; Obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal, the image reading mode solved in correlation technique is difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill, and then in digital picture, clearly can show its fluorescent fiber silk comprised, and the brightness of background parts in digital picture except fluorescent fiber silk is unaffected.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the module composition schematic diagram of the acquisition device of Digital Image Data according to the embodiment of the present invention;
Fig. 2 is the inner structure composition schematic diagram of the acquisition device of Digital Image Data according to the embodiment of the present invention;
Fig. 3 is the process flow diagram of the acquisition methods of Digital Image Data according to the embodiment of the present invention;
Fig. 4 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention one;
Fig. 5 adopts the acquisition methods of the Digital Image Data shown in Fig. 4 when gathering some row ultraviolet light images according to the preferred embodiment of the invention, the sequential chart of the control signal of the acquisition device of Digital Image Data;
Fig. 6 is the process flow diagram of the acquisition methods of another kind of Digital Image Data according to the embodiment of the present invention;
Fig. 7 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention two;
Fig. 8 is gathering some row White-light image, some row infrared light images based on the acquisition methods of the Digital Image Data shown in Fig. 7 according to the preferred embodiment of the invention, and during some row ultraviolet light images, the sequential chart of the control signal of the acquisition device of Digital Image Data;
Fig. 9 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention three;
Figure 10 is the structured flowchart of the acquisition device of Digital Image Data according to the embodiment of the present invention;
Figure 11 is the structured flowchart of the acquisition device of Digital Image Data according to the preferred embodiment of the invention;
Figure 12 is the structured flowchart of the acquisition device of another kind of Digital Image Data according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Fig. 1 is the module composition schematic diagram of the acquisition device of Digital Image Data according to the embodiment of the present invention, as shown in Figure 1, the acquisition device 100 of Digital Image Data can comprise: control module 11, communication unit 12, supply unit 13, imageing sensor 14, modulus (AD) converter 15, storer 16 and sensor unit 17.
Control module 11, for controlling other each module execution work, such as: control module 11 controls the data interaction between the acquisition device 100 of communication unit 12 combine digital view data and the main frame be connected with the acquisition device 100 of Digital Image Data, control module 11 controls supply unit 13 and drives digital picture carrier (such as: the financial document such as check, draft or other types bill) to move in the transfer passage of the acquisition device 100 of Digital Image Data, and control module 11 control chart image-position sensor 14 gathers the optical imagery etc. in digital picture carrier to be scanned.
Communication unit 12, for the data interaction between the acquisition device 100 of combine digital view data and the main frame be connected with the acquisition device 100 of Digital Image Data, such as: communication unit 12 receives the control command of the startup image scanning sent by main frame, and the Digital Image Data that AD converter 15 exports is uploaded to main frame etc. by communication unit 12.
Supply unit 13, for driving digital picture carrier to move in the transfer passage of the acquisition device 100 of Digital Image Data, supply unit 13 can comprise motor driver 131, conveying motor 132, feed roller assembly 133.Motor driver 131, control signal for exporting according to control module 11 exports the electric current of the output shaft rotation of conveying motor 132, output shaft and the feed roller assembly 133 of conveying motor 132 are in transmission connection, when carrying the output shaft rotation of motor 132, feed roller assembly 133 rotates thereupon, thus drives digital picture carrier to move in transfer passage.
Imageing sensor 14, for reading the optical imagery of digital picture carrier to be scanned, and is converted into analog electrical signal by obtained light signal, i.e. analog picture signal.Imageing sensor 14 is linear imaging sensor, it can be charge-coupled image sensor (Charge-coupledDevice, referred to as CCD) or contact-type image sensor (ContactImageSensor, referred to as CIS), in the preferred embodiment, imageing sensor 14 is CIS.Imageing sensor 14 can comprise illuminator 141 and photosensitive array 142, illuminator 141, for launching the reflected light be radiated on digital picture carrier to be scanned.Preferably, illuminator 141 can comprise multiple sub-illuminator, such as: UV-light luminous device 141a, white-light emitting device 141b and infra red light emitter 141c, wherein, UV-light luminous device 141a, for launching the ultraviolet light be radiated on digital picture carrier to be scanned, white-light emitting device 141b, for launching the white light be radiated on digital picture carrier to be scanned, infra red light emitter 141c, for launching the infrared light be radiated on digital picture carrier to be scanned, every sub-illuminator can be the line source extended along main scanning direction (namely vertical with digital picture carrier throughput direction direction).This line source can be made up of pointolite array, also can be the line source that pointolite is changed through light-strip or light guide plate; photosensitive array 142 is arranged by multiple photoreceptor and forms, the light that multiple photoreceptor is launched for the illuminator 141 received via digital picture carrier reflects to be scanned is also converted into analog picture signal, thus realize the reflected image reading digital picture carrier to be scanned, wherein, the ultraviolet light reflected image of reading digital picture carrier to be scanned is realized when photoreceptor receives the ultraviolet light launched via the UV-light luminous device 141a of digital picture carrier reflects to be scanned, the white light reflectance image of reading digital picture carrier to be scanned is realized when photoreceptor receives the white light launched via the white-light emitting device 141b of digital picture carrier reflects to be scanned, the infrared light reflection image of reading digital picture carrier to be scanned is realized when photoreceptor receives the infrared light launched via the infra red light emitter 141c of digital picture carrier reflects to be scanned, multiple photoreceptor arranges along main scanning direction, wherein, each photoreceptor is corresponding with a pixel in some row pixels of digital picture carrier to be scanned.
The control signal of illuminator 141 comprises the control signal to each sub-illuminator, corresponding reflected light whether is launched for controlling each sub-illuminator, such as: launch corresponding reflected light when corresponding with it the first control signal (such as: high level) that every sub-illuminator receives that control module exports, stop launching corresponding reflected light when corresponding with it the second control signal (such as: low level) that every sub-illuminator receives that control module exports; The control signal of photosensitive array 142 comprises line synchronizing signal SI and puts synchronizing signal CLK, after photosensitive array 142 receives the effective line synchronizing signal SI (such as: high level) of control module 11 output, start to start the optical image acquisition of some row pixels of digital picture carrier surface to be scanned and export analog picture signal, wherein, photosensitive array 142, when receiving each effective some synchronizing signal CLK (such as: rising edge) that control module 11 exports, gathers the optical imagery of a pixel.Preferably, put synchronizing signal CLK to be continued to send to the photosensitive array 142 of imageing sensor 14 by control module 11 after the acquisition device 100 of Digital Image Data powers on.
AD converter 15, analog picture signal for exporting imageing sensor 14 carries out AD conversion, generate Digital Image Data, the control signal of AD converter 15 comprises reads enable signal OE, when AD converter 15 receive control module 11 export effectively read enable signal OE (such as: low level) time, the Digital Image Data that AD converter 15 generates after exporting and carrying out AD conversion to analog picture signal, when AD converter 15 receive that control module 11 exports invalid read enable signal OE (as high level) time, AD converter 15 can not output digital image data.
Storer 16, for storing the data and variable that generate in the control program of the acquisition device 100 of Digital Image Data and control program operational process, such as: storer 16 is for storing preset time T 1, preset time T 2, preset time T 3, preset time T 4, and for storing the Digital Image Data etc. that AD converter 15 exports, wherein, preset time T 1 is the work period of the line synchronizing signal SI of imageing sensor 14, namely read cycle when imageing sensor 14 gathers the analog image of some row pixels of digital picture carrier to be scanned, after the model of imageing sensor 14 is determined, preset time T 1 to be determined by the databook consulting imageing sensor 14 by designer and is stored in storer 16, preset time T 2 is the close moment of ultraviolet source and mistiming of sending before this moment between last line synchronizing signal SI moment, wherein, ultraviolet source is the luminaire launching the ultraviolet light be radiated on digital picture carrier, ultraviolet source can be the ultra-violet light-emitting device 141a of imageing sensor 14, also can for being arranged on the arbitrary source in the transfer passage of the acquisition device 100 of Digital Image Data, the fluorescent lifetime of white light source when preset time T 3 is the White-light image of some row pixels of capturing digital image carrier, wherein, white light source is the luminaire launching the white light be radiated on digital picture carrier, white light source can be the white-light emitting device 141b of imageing sensor 14, also can for being arranged on the arbitrary source in the transfer passage of the acquisition device 100 of Digital Image Data, the fluorescent lifetime of infrared light light source when preset time T 4 is the infrared light image of some row pixels of capturing digital image carrier, wherein, infrared light light source is the luminaire launching the infrared light be radiated on digital picture carrier, infrared light light source can be the infra red light emitter 141c of imageing sensor 14, also can for being arranged on the arbitrary source in the transfer passage of the acquisition device 100 of Digital Image Data.
Sensor unit 17, for detecting the position of digital picture carrier in transfer passage to be scanned, sensor unit 17 can comprise: first sensor 171, second sensor 172 and the 3rd sensor 173.Each sensor of sensor unit 17 can be optoelectronic reflection sensor or photoelectricity transmission sensor, each sensor comprises illuminator and receiver (not shown), receiver receives the light of illuminator transmitting and is translated into electric signal, when sensor is in covered state, receiver exports the first detection signal, when sensor be in be uncovered state time, receiver exports the second detection signal.First sensor 171, second sensor 172 and the second sensor 173 are arranged in the diverse location of transfer passage, the state change of each sensor may be used for the arrival of designation number image-carrier or leaves the detection position of this sensor, show that when sensor is changed to covered state by the state of being uncovered digital picture carrier arrives the detection position of this sensor, show that when sensor is changed to be uncovered state by covered state digital picture carrier leaves the detection position of this sensor.
Preferably, the acquisition device 100 of Digital Image Data can also comprise: arbitrary source 18, arbitrary source 18 to be arranged in transfer passage and to be oppositely arranged with imageing sensor 14, for launching the transmitted light be radiated on digital picture carrier to be scanned, to coordinate the optical imagery realizing reading digital picture carrier to be scanned with the photosensitive array 142 of imageing sensor 14, wherein, the photosensitive array 142 of imageing sensor 14 receives light that the arbitrary source 18 through digital picture carrier to be scanned launches and is converted into analog picture signal, thus realize the transmission image reading digital picture carrier to be scanned.Further, arbitrary source 18 can comprise: multiple sub-arbitrary source, such as: independent ultraviolet source 18a, independent white light source 18b and independent infrared light light source 18c, wherein, independent ultraviolet source 18a is for launching the ultraviolet light be radiated on digital picture carrier to be scanned, independent white light source 18b is for launching the white light be radiated on digital picture carrier to be scanned, and independent infrared light light source 18c is for launching the infrared light be radiated on digital picture carrier to be scanned.The ultraviolet light transmission image of digital picture carrier to be scanned is realized reading when photosensitive array 142 receives the ultraviolet light through the independent ultraviolet source 18a transmitting of digital picture carrier to be scanned, realize reading the white light transmittant image of digital picture carrier to be scanned when photosensitive array 142 receives the white light through the independent white light source 18b transmitting of digital picture carrier to be scanned, realize the infrared transmission image of reading digital picture carrier to be scanned when photosensitive array 142 receives the infrared light through the independent infrared light light source 18c transmitting of digital picture carrier to be scanned.The control signal of arbitrary source 18 comprises the control signal of each sub-arbitrary source, corresponding transmitted light whether is launched for controlling each sub-arbitrary source, such as: launch corresponding transmitted light when corresponding with it the first control signal (such as: high level) that every sub-arbitrary source receives that control module exports, stop launching corresponding transmitted light when corresponding with it the second control signal (such as: low level) that every sub-arbitrary source receives that control module exports.
Fig. 2 is the inner structure composition schematic diagram of the acquisition device of Digital Image Data according to the embodiment of the present invention.As shown in Figure 2, direction shown in arrow A is the paper feed direction of digital picture carrier, with shown in arrow A side in the opposite direction for digital picture carrier move back paper direction, first sensor 171, second sensor 172, imageing sensor 14 and the 3rd sensor 173 are arranged in transfer passage successively along paper feed direction.Feed roller assembly 133 can comprise: be arranged in the conveying roller 1331 in transfer passage, conveying roller 1332, conveying roller 1333 and conveying roller 1334 successively along paper feed direction, wherein, each conveying roller can comprise: the drive roll be oppositely arranged and driven voller, each drive roll is in transmission connection with conveying motor 132, when carrying the output shaft rotation of motor 132, the drive roll of each conveying roller rotates thereupon, thus drives digital picture carrier to move in transfer passage.When digital picture carrier moves in transfer passage, its surface to be scanned is relative with the photosensitive array 142 of imageing sensor 14, the optical imagery on the surface to be scanned of imageing sensor 14 capturing digital image carrier.First sensor 171 is positioned at the entrance P place of transfer passage, for detecting the entrance P whether having digital picture carrier to be fed through transfer passage, second sensor 172 is positioned at the upstream of imageing sensor 14 along paper feed direction, and its distance detected between position and the scanning position of imageing sensor 14 is L1, 3rd sensor 173 is positioned at the downstream of imageing sensor 14 along paper feed direction, wherein, the scanning position of imageing sensor 14 is its photosensitive array 142 position in transfer passage, because imageing sensor 14 when digital picture carrier is positioned at the scanning position of imageing sensor 14 could the optical imagery of capturing digital image carrier, therefore, the scanning position of imageing sensor 14 is also referred to as the scanning starting position of acquisition device 100 being digital picture carrier Digital Image Data.
In preferred implementation process, the inner structure composition schematic diagram of the acquisition device of the module composition schematic diagram of the acquisition device of the Digital Image Data shown in above-mentioned Fig. 1 and the Digital Image Data shown in Fig. 2 can be applied in the genuine/counterfeit discriminating scene of finance or other types bill, such as, the acquisition device of Digital Image Data is financial document image-reading device.Hereinafter distinguish that the application of scene to technical scheme that the embodiment of the present invention provide be illustrated in conjunction with above-mentioned Fig. 1 and Fig. 2 at papers for bill by for digital picture carrier, but it does not form to improper restriction of the present invention.
Fig. 3 is the process flow diagram of the acquisition methods of Digital Image Data according to the embodiment of the present invention.As shown in Figure 3, the method can comprise following treatment step:
Step S302: after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer;
Step S304: when sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal;
Step S306: obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal.
Image reading mode in correlation technique is difficult to pass through the fluorescent fiber silk feature that obtained bill images extracts bill.Adopt method as shown in Figure 3, the fluorescent lifetime T of ultraviolet source
lEDuvbe set to meet N*T1 < T
lEDuv< (N+1) * T1, wherein, N is positive integer, T1 is the work period of the line synchronizing signal of imageing sensor, when can guarantee transmission M+N line synchronizing signal by arranging suitable N value, fluorescent fiber silk to be scanned obtains enough UV energy and sends visible fluorescence, therefore, after transmission M+N line synchronizing signal read and the AD converter stored export some row digital pictures clearly can show comprised fluorescent fiber silk, due to the work period of the line synchronizing signal without the need to changing imageing sensor, therefore, after transmission M+N line synchronizing signal read and in some row digital pictures of exporting of the AD converter stored the brightness of background parts except fluorescent fiber silk unaffected.The image reading mode solved thus in correlation technique is difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill, and then in digital picture, clearly can show its fluorescent fiber silk comprised, and the brightness of background parts in digital picture except fluorescent fiber silk is unaffected.
Preferably, in step S306, obtaining the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal can comprise the following steps:
Step S1: at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Preferably, in step sl, read and store AD converter export some row ultraviolet light Digital Image Data can comprise with one of under type:
Mode one, M line synchronizing signal to each line synchronizing signal of M+N line synchronizing signal work period at the end of read and store AD converter export some line number digital image data, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making transmission M line synchronizing signal to M+N line synchronizing signal, only to store in storer at the end of the work period of M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored;
Mode two, only at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Fig. 4 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention one.As shown in Figure 4, this image reading method may be used for the ultraviolet light image of some row pixels reading bill, and the method can comprise following treatment step:
Step S402: send first line synchronizing signal to imageing sensor.
Control module sends first line synchronizing signal to start the analog image that imageing sensor gathers some row pixels of bill to imageing sensor.Control module, after send first line synchronizing signal to imageing sensor, starts the 4th timing.In the present embodiment, M equals 1.
It should be noted that, control module sends a line synchronizing signal to imageing sensor and refers to that control module sends an effective horizontal synchronizing pulse to imageing sensor, namely under default situations, control module sends the line synchronizing signal of inactive level (such as: low level) to imageing sensor, when needing the analog image of some row pixels starting imageing sensor collection bill, control module sends the line synchronizing signal of significant level (such as: high level) to imageing sensor, and make this significant level continue the pulse width set, then the line synchronizing signal of inactive level is sent to imageing sensor, to complete the transmission of a line synchronizing signal.
Step S404: send the first control signal to open ultraviolet source to ultraviolet source.
Control module sends the first control signal to open ultraviolet source to ultraviolet source, makes ultraviolet source launch the ultraviolet light be radiated on bill to be scanned, and wherein, ultraviolet source is the luminaire launching the ultraviolet light be radiated on bill.Ultraviolet source can be the ultra-violet light-emitting device 141a of above-mentioned imageing sensor 14, also can for being arranged on the independent ultraviolet source 18a in the transfer passage of the acquisition device of bill Digital Image Data.
Step S406: send second to the 4th line synchronizing signal to imageing sensor.
When the 4th timing arrives preset time T 1, control module sends second to the 4th line synchronizing signal to imageing sensor, in the present embodiment, and N=3.Control module resets the 4th timing when the 4th timing arrives preset time T 1 at every turn, then sends next line synchronizing signal and restarts the 4th timing, thus ensureing that the work period of each line synchronizing signal is preset time T 1.Control module starts the first timing after sending the 4th line synchronizing signal.
Step S408: send the second control signal to close ultraviolet source to ultraviolet source.
When the first timing arrives preset time T 2, control module sends the second control signal to close ultraviolet source to ultraviolet source, ultraviolet source is made to stop launching the ultraviolet light be radiated on bill to be scanned, wherein, 0 < T2 < T1, preferably, T1/3 < T2 < T1.
Because control module opens ultraviolet source after transmission first line synchronizing signal, after transmission the 4th line synchronizing signal, interval preset time T 2 closes ultraviolet source, therefore, and the fluorescent lifetime T of ultraviolet source
lED=3*T1+T2, due to 0 < T2 < T1, therefore, the fluorescent lifetime T of ultraviolet source
lEDmeet: 3*T1 < T
lED< 4*T1, wherein, T1 is the work period of the line synchronizing signal of imageing sensor.
Step S410: read some line number digital image data of AD converter output and be stored in storer.
Control module reads some line number digital image data that AD converter exports and is also preserved in memory, and namely control module reads and some line number digital image data of AD converter output after storing transmission the 4th line synchronizing signal.Control module can realize reading by different modes and some line number digital image data of AD converter output after storing transmission the 4th line synchronizing signal, such as: the enable signal OE that reads of AD converter is set to significant level by control module all the time, and during the 4th timing arrival preset time T 1 started after sending each line synchronizing signal, read some line number digital image data of AD converter output, read every bit line number digital image data is stored in memory, and identical initial memory address is set when storing every bit line number digital image data, more front line number digital image data covers by namely read rear line number digital image data, thus realize only storing last point line number digital image data in transmission the 4th line synchronizing signal background storage, preferably, the enable signal OE that reads of AD converter is set to inactive level by control module before transmission first line synchronizing signal, the enable signal OE that reads of AD converter is set to significant level when arriving preset time T 1 by the 4th timing started after transmission the 4th line synchronizing signal, reads some line number digital image data of AD converter output and is preserved in memory.
Fig. 5 adopts the acquisition methods of the Digital Image Data shown in Fig. 4 when gathering some row ultraviolet light images according to the preferred embodiment of the invention, the sequential chart of the control signal of the acquisition device of Digital Image Data.As shown in Figure 5, the work period T1 of line synchronizing signal SI is 200 μ s, the close moment of ultraviolet source and send last line synchronizing signal moment before this moment, and namely the mistiming T2 sent between the 4th line synchronizing signal moment is 120 μ s.Control module arranges ultraviolet source control signal LEDuv after sending first line synchronizing signal be that high level is to open ultraviolet source, simultaneously, work period T1 at interval of a line synchronizing signal SI sends a line synchronizing signal, when after transmission the 4th line synchronizing signal, and with transmission the 4th line synchronizing signal time at intervals preset time T 2 (i.e. 120 μ s) moment, it is that low level is to close ultraviolet source that control module arranges ultraviolet source control signal LEDuv, and after transmission the 4th line synchronizing signal, and with transmission the 4th line synchronizing signal time at intervals preset time T 1 (i.e. 200 μ s) moment, the enable signal of reading arranging AD converter is some line number digital image data that effective low level exports to read AD converter.As can be seen here, gather in the process of the ultraviolet light image of some row pixels, the fluorescent lifetime T of ultraviolet source
lEDuv=3*T1+T2=720 μ s.After sending the 4th line synchronizing signal, when starting imageing sensor collection some row pixels analog image, the this point row pixel of bill to be scanned is the work period of three line synchronizing signals by UV-irradiation, therefore, the fluorescent fiber silk embedded in this row pixel obtains enough energy and sends visible fluorescence, therefore, after sending the 4th line synchronizing signal, imageing sensor can gather the image of the fluorescent fiber silk of bill.Meanwhile, because the work period of line synchronizing signal does not extend, make the background parts brightness in gathered bill images except fluorescent fiber silk lower.Therefore, its bill images obtained has higher contrast, thus easily can be extracted the fluorescent fiber silk feature of bill by this bill images.
Fig. 6 is the process flow diagram of the acquisition methods of another kind of Digital Image Data according to the embodiment of the present invention.As shown in Figure 6, the method can comprise following treatment step:
Step S602: after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer;
Step S604: when sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal;
Step S606: obtain the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal;
Step S608: after sending a jth line synchronizing signal to imageing sensor, open white light source, and start the second timing when opening white light source, wherein, white light source is for irradiating bill to be scanned with the White-light image making imageing sensor gather bill to be scanned, and j is positive integer;
Step S610: close white light source when the second timing arrives the second preset duration, wherein, the second preset duration is less than the work period of a jth line synchronizing signal;
Step S612: obtain the White Light Digital view data corresponding with the work period of a jth line synchronizing signal;
Step S614: after sending a kth line synchronizing signal to imageing sensor, open infrared light light source, and start the 3rd timing when opening infrared light light source, wherein, infrared light light source is for irradiating bill to be scanned with the infrared light image making imageing sensor gather bill to be scanned, and k is positive integer;
Step S616: close infrared light light source when the 3rd timing arrives the 3rd preset duration, wherein, the 3rd preset duration is less than the work period of a kth line synchronizing signal;
Step S618: obtain the infrared light Digital Image Data corresponding with the work period of a kth line synchronizing signal.
In preferred implementation process, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
It should be noted that, three processes of acquisition infrared light Digital Image Data, White Light Digital view data and ultraviolet light Digital Image Data are separate and do not have sequencing.Above preferred embodiment of the present invention according to White Light Digital view data, infrared light Digital Image Data and ultraviolet light Digital Image Data be only a kind of preferred execution sequence, it does not form inappropriate limitation of the present invention.The combination in any output order of three kinds of Digital Image Data is all within protection scope of the present invention.
Fig. 7 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention two.As shown in Figure 7, this image reading method is used for driving in the process of bill mobile some row pixels in transfer passage at supply unit, read the White-light image of this point row pixel of bill, infrared light image and ultraviolet light image respectively, the method can comprise following treatment step:
Step S702: send first line synchronizing signal to imageing sensor, controls the luminous preset time T 3 of white light source, reads and stores some row White Light Digital view data of AD converter output.
Control module sends first line synchronizing signal to start the optical imagery that imageing sensor gathers some row pixels of bill to imageing sensor, and, after sending first line synchronizing signal to imageing sensor, control module sends the first control signal to open white light source to white light source, wherein, white light source is the luminaire launching the white light be radiated on bill, white light source can be the white-light emitting device 141b of imageing sensor 14, also can for being arranged on the independent white light source 18b in the transfer passage of the acquisition device of Digital Image Data.
Control module is when sending first line synchronizing signal to imageing sensor, start the 4th timing, and after sending the first control signal to white light source, start the second timing, and send the second control signal to close white light source when the second timing arrives preset time T 3 to white light source, wherein, T3 < T1.When the 4th timing arrives preset time T 1, control module reads the Digital Image Data (hereinafter referred to as some line number digital image data) of some row pixels that AD converter exports.Because before some Digital Image Data reading AD converter output, white light source transmitting white irradiates bill to be scanned, therefore, the Digital Image Data that control module reads is some row White Light Digital view data.
Step S704: send second line synchronizing signal to imageing sensor, controls infrared light light source luminescent preset time T 4, reads and stores some row infrared light Digital Image Data of AD converter output.
Control module sends second line synchronizing signal to start the optical imagery that imageing sensor gathers some row pixels of bill to imageing sensor, and, after sending second line synchronizing signal to imageing sensor, control module sends the first control signal to open infrared light light source to infrared light light source, wherein, infrared light light source is the luminaire launching the infrared light be radiated on bill, infrared light light source can be the infra red light emitter 141c of imageing sensor 14, also can for being arranged on the independent infrared light light source 18c in the transfer passage of the acquisition device of Digital Image Data.
When control module sends second line synchronizing signal to imageing sensor, start the 4th timing, after sending the first control signal to infrared light light source, start the 3rd timing, and send the second control signal to close infrared light light source when the 3rd timing arrives preset time T 4 to infrared light light source, wherein, T4 < T1.When the 4th timing arrives preset time T 1, control module reads some line number digital image data that AD converter exports.Due to before some line number digital image data reading AD converter output, infrared light light source launches Infrared irradiation bill to be scanned, and therefore, the Digital Image Data that control module reads is some row infrared light Digital Image Data.
Step S706: send the 3rd to the 6th line synchronizing signal to imageing sensor, controls the luminous preset time T of ultraviolet source
lEDuv, and read after transmission the 6th line synchronizing signal and store AD converter export some row ultraviolet light Digital Image Data.
Control module sends the 3rd to the 6th line synchronizing signal to imageing sensor, and the first control signal is sent to open ultraviolet source to ultraviolet source after transmission the 3rd line synchronizing signal, when sending the 6th line synchronizing signal, start the first timing, send the second control signal to close ultraviolet source when the first timing arrives preset time T 2 to ultraviolet source, namely control the luminous preset time T of ultraviolet source
lEDuv, wherein, T
lEDuv=3*T1+T2.And, when control module sends the 3rd line synchronizing signal to imageing sensor, start the 4th timing, when the 4th timing arrives preset time T 1, control module reads and stores some line number digital image data of AD converter output, more i.e. row ultraviolet light Digital Image Data.The concrete manner of execution of this step with reference to above-mentioned steps S402 ~ step S410, can repeat no more herein.
As seen from the above, in the present embodiment, M equals 3, N and equals 3, j and equal 1, k and equal 2.
Fig. 8 is gathering some row White-light image, some row infrared light images based on the acquisition methods of the Digital Image Data shown in Fig. 7 according to the preferred embodiment of the invention, and during some row ultraviolet light images, the sequential chart of the control signal of the acquisition device of Digital Image Data.As shown in Figure 8, AD converter read enable signal all the time OE be set to significant level (low level), send each line synchronizing signal moment from control module to imageing sensor, interval reaches preset time T 1, and AD converter exports some line number digital image data.Due to control module send first line synchronizing signal after arrange white light source control signal LEDr/g/b be significant level (high level) and continue preset time T 3, therefore, first line number digital image data L1 that AD converter exports is White Light Digital view data.Due to control module send second line synchronizing signal after arrange infrared light light source control signal LEDir be significant level (high level) and continue preset time T 4, therefore, the second point line number digital image data L2 that AD converter exports is infrared light Digital Image Data.Afterwards, control module sends the 3rd to the 6th line synchronizing signal again, and arrange after transmission the 3rd line synchronizing signal ultraviolet source control signal LEDuv be significant level (high level) and continue preset time T
lEDuv, therefore, the the 3rd to the 6th line number digital image data L3 ~ L6 that AD converter exports is ultraviolet light Digital Image Data, but the 6th the line number digital image data L6 that after control module only stores transmission the 6th line synchronizing signal, AD converter exports, due to luminous three line periods of ultraviolet source when control module sends the 6th line synchronizing signal, therefore, the fluorescent fiber silk comprised in some row pixels to be scanned obtains enough energy and sends fluorescence, so control module to read and the store the 6th row digital picture clearly can show comprised fluorescent fiber silk.
By the image reading method of the acquisition device of the Digital Image Data of above preferred embodiment, the acquisition device of Digital Image Data achieves the reading of the various light sources view data of some row pixels of bill.
It should be noted that, step S702, step S704 and step S706 are separate, and namely the execution sequence of step S702, step S704 and step S706 can be combination in any.
Fig. 9 is the process flow diagram of the acquisition methods of Digital Image Data according to the preferred embodiment of the present invention three.As shown in Figure 9, the acquisition methods of this Digital Image Data is for reading the view picture visible images of a bill, view picture infrared light image and view picture ultraviolet light image, and the method can comprise following treatment step:
Step S902: perform initialization operation.
After the acquisition device of Digital Image Data powers on, control module carries out the initialization of being correlated with, such as: control module carries out the initialization of correlated variables, the initialization of storer, and the initialization etc. of coherent signal, wherein, when carrying out the initialization of coherent signal, control module arranges the pulse width of line synchronizing signal and work period, the pulse width of some synchronizing signal and work period according to the databook of imageing sensor, and continues output point synchronizing signal by the setting work period to imageing sensor.
Step S904: the initiating terminal of bill is delivered to scanning starting position.
When control module receives the control command of the startup image scanning that main frame sends by communication unit, or, when control module detects that bill is admitted to transfer passage by first sensor, (such as: when being detected that by first sensor bill arrives the detection position of first sensor), control module controls supply unit and drives bill to move in transfer passage, and the initiating terminal of bill is delivered to scanning starting position.
Preferably, when by the second sensor, control module detects that bill initiating terminal arrives during the detection position of the second sensor, continue to drive bill to move predeterminable range L1, arrive scanning starting position to make bill initiating terminal.
Step S906: the Digital Image Data gathering some row pixels.
Control module sends N+3 line synchronizing signal to imageing sensor, wherein, N is positive integer, and control after transmission first line synchronizing signal white-light emitting preset time T 3 with read and store AD converter export some row White Light Digital view data, the luminous preset time T 4 of infrared light is controlled to read and to store some row infrared light Digital Image Data of AD converter output after transmission second line synchronizing signal, UV-light luminous preset time T LEDuv is controlled after transmission the 3rd line synchronizing signal, and read after transmission N+3 line synchronizing signal and store AD converter export some row ultraviolet light Digital Image Data.The concrete manner of execution of this step, with step S702 ~ step S706, repeats no more herein.
Step S908: drive bill paper feed some row.
Control module controls supply unit and drives bill to move some row along paper feed direction in transfer passage, namely drives bill in transfer passage, move the distance of some row pixels along paper feed direction.
Step S910: whether decides bill leaves the scanning position of imageing sensor.
Control module detects the state of the 3rd sensor, whether decides bill leaves the detection position of the 3rd sensor, when detect the 3rd sensor by covered state change to be uncovered state time, when judging that bill leaves the detection position of the 3rd sensor, now, control module judges that bill has left the scanning position of imageing sensor, performs step S912; Otherwise control module judges that bill does not leave the scanning position of imageing sensor, continue to perform step S906.
Step S912, sends transfer passage by bill.
When judging that bill has left the scanning position of imageing sensor, control module controls supply unit and drives bill to move that bill is sent transfer passage, such as: control module controls supply unit and drives bill to move, so that bill is sent output channel along moving back paper direction.
Figure 10 is the structured flowchart of the acquisition device of Digital Image Data according to the embodiment of the present invention.As shown in Figure 10, the acquisition device of this Digital Image Data can comprise: the first opening module 10, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; First closing module 20, for when sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; First acquisition module 30, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal.
Adopt device as shown in Figure 10, the image reading mode solved in correlation technique is difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill, and then in digital picture, clearly can show its fluorescent fiber silk comprised, and the brightness of background parts in digital picture except fluorescent fiber silk is unaffected.
Preferably, the first acquisition module 30, at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Preferably, as shown in figure 11, first acquisition module 30 can comprise: the first acquiring unit 300, for read at the end of the work period of each line synchronizing signal and store AD converter export some line number digital image data, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making transmission M line synchronizing signal to M+N line synchronizing signal, only to store in storer at the end of the work period of M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored, second acquisition unit 302, for only at the end of the work period of M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
Figure 12 is the structured flowchart of the acquisition device of another kind of Digital Image Data according to the embodiment of the present invention.As shown in figure 12, the acquisition device of this Digital Image Data can comprise: the second opening module 1202, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making imageing sensor gather bill to be scanned, and M is positive integer; Second closing module 1204, for when sending M+N line synchronizing signal to imageing sensor, start the first timing, when the first timing arrives the first preset duration, close ultraviolet source, wherein, N is positive integer, first preset duration is greater than the pulse width of M+N line synchronizing signal, is less than the work period of M+N line synchronizing signal; Second acquisition module 1206, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of M+N line synchronizing signal; 3rd opening module 1208, for after sending a jth line synchronizing signal to imageing sensor, open white light source, and start the second timing when opening white light source, wherein, white light source is for irradiating bill to be scanned with the White-light image making imageing sensor gather bill to be scanned, and j is positive integer; 3rd closing module 1210, for closing white light source when the second timing arrives the second preset duration, wherein, the second preset duration is less than the work period of a jth line synchronizing signal; 3rd acquisition module 1212, for obtaining the White Light Digital view data corresponding with the work period of a jth line synchronizing signal; 4th opening module 1214, for after sending a kth line synchronizing signal to imageing sensor, open infrared light light source, and start the 3rd timing when opening infrared light light source, wherein, infrared light light source is for irradiating bill to be scanned with the infrared light image making imageing sensor gather bill to be scanned, and k is positive integer; 4th closing module 1216, for closing infrared light light source when the 3rd timing arrives the 3rd preset duration, wherein, the 3rd preset duration is less than the work period of a kth line synchronizing signal; 4th acquisition module 1218, for obtaining the infrared light Digital Image Data corresponding with the work period of a kth line synchronizing signal.
Preferably, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
From above description, can find out, above embodiments enable following technique effect (it should be noted that these effects are effects that some preferred embodiment can reach): adopt the technical scheme that the embodiment of the present invention provides, after transmission M+N line synchronizing signal read and the AD converter stored export some row digital pictures clearly can show comprised fluorescent fiber silk, due to the work period of the line synchronizing signal without the need to changing imageing sensor, therefore, after transmission M+N line synchronizing signal read and in some row digital pictures of exporting of the AD converter stored the brightness of background parts except fluorescent fiber silk unaffected.The image reading mode solved thus in correlation technique is difficult to pass through the problem that obtained bill images extracts the fluorescent fiber silk feature of bill, and then in digital picture, clearly can show its fluorescent fiber silk comprised, and the brightness of background parts in digital picture except fluorescent fiber silk is unaffected.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an acquisition methods for Digital Image Data, is characterized in that, comprising:
After sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, described ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making described imageing sensor gather described bill to be scanned, and M is positive integer;
When sending M+N line synchronizing signal to described imageing sensor, start the first timing, when described first timing arrives the first preset duration, close described ultraviolet source, wherein, N is positive integer, and described first preset duration is greater than the pulse width of described M+N line synchronizing signal, is less than the work period of described M+N line synchronizing signal;
Obtain the ultraviolet light Digital Image Data corresponding with the work period of described M+N line synchronizing signal.
2. method according to claim 1, is characterized in that, obtains the ultraviolet light Digital Image Data corresponding with the work period of described M+N line synchronizing signal and comprises:
At the end of the work period of described M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
3. method according to claim 2, is characterized in that, reads and store the more described row ultraviolet light Digital Image Data that described AD converter exports to comprise one of following:
Described M line synchronizing signal to described M+N line synchronizing signal each line synchronizing signal work period at the end of read and store described AD converter output some line number digital image data, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making sending described M line synchronizing signal to described M+N line synchronizing signal, only to store in storer at the end of the work period of described M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored,
Only at the end of the work period of described M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
4. an acquisition methods for Digital Image Data, is characterized in that, comprising:
Step a:
After sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, described ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making described imageing sensor gather described bill to be scanned, and M is positive integer;
When sending M+N line synchronizing signal to described imageing sensor, start the first timing, when described first timing arrives the first preset duration, close described ultraviolet source, wherein, N is positive integer, and described first preset duration is greater than the pulse width of described M+N line synchronizing signal, is less than the work period of described M+N line synchronizing signal;
Obtain the ultraviolet light Digital Image Data corresponding with the work period of described M+N line synchronizing signal;
Step b:
After sending a jth line synchronizing signal to described imageing sensor, open white light source, and start the second timing when opening described white light source, wherein, described white light source is for irradiating described bill to be scanned with the White-light image making described imageing sensor gather described bill to be scanned, and j is positive integer;
Close described white light source when described second timing arrives the second preset duration, wherein, described second preset duration is less than the work period of a described jth line synchronizing signal;
Obtain the White Light Digital view data corresponding with the work period of a described jth line synchronizing signal;
Step c:
After sending a kth line synchronizing signal to described imageing sensor, open infrared light light source, and start the 3rd timing when opening described infrared light light source, wherein, described infrared light light source is for irradiating described bill to be scanned with the infrared light image making described imageing sensor gather described bill to be scanned, and k is positive integer;
Close described infrared light light source when described 3rd timing arrives the 3rd preset duration, wherein, described 3rd preset duration is less than the work period of a described kth line synchronizing signal;
Obtain the infrared light Digital Image Data corresponding with the work period of a described kth line synchronizing signal;
Wherein, step a, step b and step c is performed according to random order.
5. method according to claim 4, is characterized in that, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
6. an acquisition device for Digital Image Data, is characterized in that, comprising:
First opening module, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, described ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making described imageing sensor gather described bill to be scanned, and M is positive integer;
First closing module, for when sending M+N line synchronizing signal to described imageing sensor, start the first timing, when described first timing arrives the first preset duration, close described ultraviolet source, wherein, N is positive integer, described first preset duration is greater than the pulse width of described M+N line synchronizing signal, is less than the work period of described M+N line synchronizing signal;
First acquisition module, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of described M+N line synchronizing signal.
7. device according to claim 6, is characterized in that, described first acquisition module, at the end of the work period of described M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
8. device according to claim 7, is characterized in that, described first acquisition module comprises:
First acquiring unit, for described M line synchronizing signal to described M+N line synchronizing signal each line synchronizing signal work period at the end of read and store described AD converter output some line number digital image data, wherein, each some line number digital image data stored cover the Digital Image Data that the last time stores, after making sending described M line synchronizing signal to described M+N line synchronizing signal, only to store in storer at the end of the work period of described M+N line synchronizing signal read and some row ultraviolet light Digital Image Data of exporting of the AD converter stored,
Second acquisition unit, for only at the end of the work period of described M+N line synchronizing signal, read and store AD converter export some row ultraviolet light Digital Image Data.
9. an acquisition device for Digital Image Data, is characterized in that, comprising:
Second opening module, for after sending M line synchronizing signal to imageing sensor, open ultraviolet source, wherein, described ultraviolet source is for irradiating bill to be scanned with the ultraviolet light image making described imageing sensor gather described bill to be scanned, and M is positive integer;
Second closing module, for when sending M+N line synchronizing signal to described imageing sensor, start the first timing, when described first timing arrives the first preset duration, close described ultraviolet source, wherein, N is positive integer, described first preset duration is greater than the pulse width of described M+N line synchronizing signal, is less than the work period of described M+N line synchronizing signal;
Second acquisition module, for obtaining the ultraviolet light Digital Image Data corresponding with the work period of described M+N line synchronizing signal;
3rd opening module, for after sending a jth line synchronizing signal to described imageing sensor, open white light source, and start the second timing when opening described white light source, wherein, described white light source is for irradiating described bill to be scanned with the White-light image making described imageing sensor gather described bill to be scanned, and j is positive integer;
3rd closing module, for closing described white light source when described second timing arrives the second preset duration, wherein, described second preset duration is less than the work period of a described jth line synchronizing signal;
3rd acquisition module, for obtaining the White Light Digital view data corresponding with the work period of a described jth line synchronizing signal;
4th opening module, for after sending a kth line synchronizing signal to described imageing sensor, open infrared light light source, and start the 3rd timing when opening described infrared light light source, wherein, described infrared light light source is for irradiating described bill to be scanned with the infrared light image making described imageing sensor gather described bill to be scanned, and k is positive integer;
4th closing module, for closing described infrared light light source when described 3rd timing arrives the 3rd preset duration, wherein, described 3rd preset duration is less than the work period of a described kth line synchronizing signal;
4th acquisition module, for obtaining the infrared light Digital Image Data corresponding with the work period of a described kth line synchronizing signal.
10. device according to claim 9, is characterized in that, M be greater than 2 positive integer, j equals M-2, and k equals M-1.
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