CN105243726B - The acquisition methods and device of digital image data - Google Patents

Abstract

The invention discloses a kind of acquisition methods of digital image data and device, in the above-mentioned methods, after m-th line synchronising signal is sent to imaging sensor, open ultraviolet source, wherein, ultraviolet source is used to irradiate bill to be scanned the ultraviolet light image so that imaging sensor gathers bill to be scanned, and M is positive integer；When sending M+N line synchronising signal to imaging sensor, start the first timing, when the first timing reaches the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, less than the work period of the M+N line synchronising signal；Obtain ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal.According to technical scheme provided by the invention, its fluorescent fiber silk included can be clearly displayed in digital picture, and the brightness of the background parts in digital picture in addition to fluorescent fiber silk is unaffected.

Description

The acquisition methods and device of digital image data

Technical field

The present invention relates to image processing field, in particular to the acquisition methods and device of a kind of digital image data.

Background technology

Financial document is to be signed and issued by financial institution or undertaken by financial institution the bill for paying obligation, the existing finance in China Bill includes：Draft, check, cashier's cheque etc..At present, the false proof mode of financial document (hereinafter referred to as bill) mainly passes through finance Bill images read equipment (hereinafter referred to as bill images reading equipment) collection bill image, by by pay when bill figure The image of bill carries out the true and false that contrast judges bill during as with signing and issuing.In recent years, some special bills pass through in check paper The middle irregular fluorescent fiber silk of insertion strengthens the security feature of bill, such as：China's 2010 editions used of circulating now are held To convert and irregular fluorescent fiber silk is embedded with the check paper of draft, the fluorescent fiber silk is invisible under white light illumination, and The visible fluorescence of red, blue two kinds of colors can be sent under ultraviolet light.By detecting fluorescent fiber silk embedded in check paper It is a kind of conventional means of current bill process field to carry out bill false distinguishing, such as：Utilize fluorescent fiber embedded in check paper The method that the ordered state data of silk carry out bill false distinguishing.

A kind of image-reading device and image reading method are provided in correlation technique, the image-reading device can wrap Include：Imaging sensor, the imaging sensor can be charge-coupled image sensor (Charge-coupled Device, abbreviation For CCD) or the linear transducer such as contact-type image sensor (Contact Image Sensor, referred to as CIS).Image passes Sensor can be arranged in media transport path, and it can include：Photophore and photosensitive array.In each of image-reading device In read cycle (READING CYCLE), photophore light (LIGHT SOURCE ON) setting time, pass through read it is each read it is all The signal that photosensitive array exports in phase can realize the reading of the view data of some row pixels.The image-reading device it is every Photophore is luminous once in the individual read cycle, i.e. the fluorescent lifetime that the photophore of the image-reading device is each is set to less than one The individual read cycle.

However, existing bill fluorescent fiber silk need can be sent under the ultraviolet light of high-energy it is visible glimmering Light.When the photophore emitting ultraviolet light irradiation bill by making the image-reading device in correlation technique, to obtain bill images During so as to extract the fluorescent fiber silk feature of bill, due to photophore transmitting ultraviolet light maximum intensity by photophore most Big input current is limited to fixed value, therefore, the energy and fluorescent lifetime of the ultraviolet light of its transmitting when photophore lights every time Directly proportional, fluorescent lifetime is longer, and the energy of the ultraviolet light of photophore transmitting is higher.Bill is obtained using the image-reading device During picture, if photophore it is each fluorescent lifetime it is shorter, because the energy deficiency of ultraviolet light of its transmitting causes fluorescent fiber silk It is weaker that the brightness of fluorescence or the fluorescence sent can not be sent, so as to cause by the bill images acquired in image-reading device It is difficult to the fluorescent fiber silk feature for extracting bill；And if extending each fluorescent lifetime of photophore, then need synchronous adjustment figure Read cycle as reading equipment, now, the energy accumulation for causing photosensitive array to obtain because the read cycle is elongated causes acquired Background parts in bill images in addition to fluorescent fiber silk can also brighten, i.e. pair of bill images acquired in image-reading device Reduced than degree, cause to be difficult to the fluorescent fiber silk feature for extracting bill.

The fluorescence for being difficult to extract bill by acquired bill images for the image reading method in correlation technique is fine The problem of tieing up silk feature, not yet proposes effective solution at present.

The content of the invention

The invention provides a kind of acquisition methods of digital image data and device, at least to solve the figure in correlation technique The problem of being difficult to extract the fluorescent fiber silk feature of bill by acquired bill images as reading manner.

A kind of according to an aspect of the invention, there is provided acquisition methods of digital image data.

The acquisition methods of digital image data according to embodiments of the present invention include：M-th is being sent to imaging sensor After line synchronising signal, ultraviolet source is opened, wherein, ultraviolet source is used to irradiate bill to be scanned so that imaging sensor The ultraviolet light image of bill to be scanned is gathered, M is positive integer；When sending M+N line synchronising signal to imaging sensor, open Dynamic first timing, when the first timing reaches the first preset duration, ultraviolet source is closed, wherein, N is positive integer, and first is pre- If duration is more than the pulse width of the M+N line synchronising signal, less than the work period of the M+N line synchronising signal；Obtain with Ultraviolet light digital image data corresponding to the work period of the M+N line synchronising signal.

Preferably, obtaining ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal includes： At the end of the work period of the M+N line synchronising signal, read and store some row ultraviolet lights numeral of a/d converter output View data.

Preferably, some row ultraviolet light digital image datas for reading and storing a/d converter output include one below： Read and deposit at the end of m-th line synchronising signal to the work period of each line synchronising signal of the M+N line synchronising signal Some row digital image datas of a/d converter output are stored up, wherein, some row digital image datas stored every time are to upper one Secondary stored digital image data is covered, to send m-th line synchronising signal to the M+N line synchronising signal Afterwards, only it is stored with the a/d converter for reading and storing at the end of the work period of the M+N line synchronising signal in memory Some row ultraviolet light digital image datas of output；Only at the end of the work period of the M+N line synchronising signal, read and deposit Store up some row ultraviolet light digital image datas of a/d converter output.

According to another aspect of the present invention, there is provided the acquisition methods of another digital image data.

The acquisition methods of digital image data according to embodiments of the present invention include：

Step a：

After m-th line synchronising signal is sent to imaging sensor, ultraviolet source is opened, wherein, ultraviolet source For irradiating bill to be scanned so that imaging sensor gathers the ultraviolet light image of bill to be scanned, M is positive integer；To image When sensor sends M+N line synchronising signal, start the first timing, when the first timing reaches the first preset duration, close Ultraviolet source, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, less than M The work period of+N number of line synchronising signal；Obtain ultraviolet light digitized map corresponding with the work period of the M+N line synchronising signal As data；

Step b：

After j-th of line synchronising signal is sent to imaging sensor, white light source is opened, and when opening white light source Start the second timing, wherein, white light source is used to irradiate bill to be scanned so that imaging sensor gathers the white of bill to be scanned Light image, j are positive integer；White light source is closed when the second timing reaches the second preset duration, wherein, the second preset duration is small In the work period of j-th of line synchronising signal；Obtain White Light Digital image corresponding with the work period of j-th of line synchronising signal Data；

Step c：

After k-th of line synchronising signal is sent to imaging sensor, infrared light light source is opened, and opening infrared light light Start the 3rd timing during source, wherein, infrared light light source is used to irradiate bill to be scanned so that imaging sensor gathers ticket to be scanned According to infrared light image, k is positive integer；Infrared light light source is closed when the 3rd timing reaches three preset durations, wherein, the 3rd Preset duration is less than the work period of k-th of line synchronising signal；Obtain corresponding with the work period of k-th of line synchronising signal red Outer smooth digital image data.

Wherein, step a, step b and step c are performed in any order.

Preferably, M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.

According to another aspect of the invention, there is provided a kind of acquisition device of digital image data.

The acquisition device of digital image data according to embodiments of the present invention includes：First opening module, for figure After sending m-th line synchronising signal as sensor, ultraviolet source is opened, wherein, ultraviolet source is to be scanned for irradiating For bill so that imaging sensor gathers the ultraviolet light image of bill to be scanned, M is positive integer；First closedown module, for When imaging sensor sends M+N line synchronising signal, start the first timing, when the first timing reaches the first preset duration, Ultraviolet source is closed, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, small In the work period of the M+N line synchronising signal；First acquisition module, for obtaining the work with the M+N line synchronising signal Ultraviolet light digital image data corresponding to cycle.

Preferably, the first acquisition module, at the end of the work period of the M+N line synchronising signal, reading and depositing Store up some row ultraviolet light digital image datas of a/d converter output.

Preferably, the first acquisition module includes：First acquisition unit, in m-th line synchronising signal to the M+N row Read at the end of the work period of each line synchronising signal of synchronizing signal and store some row digitized maps of a/d converter output As data, wherein, the digital image data that some row digital image datas stored every time are stored to the last time is covered Lid, to cause after sending m-th line synchronising signal to the M+N line synchronising signal, only it is stored with the M+N row in memory Some row ultraviolet light digital image datas for the a/d converter output read and stored at the end of the work period of synchronizing signal； Second acquisition unit, for only at the end of the work period of the M+N line synchronising signal, reading and storing a/d converter output Some row ultraviolet light digital image datas.

In accordance with a further aspect of the present invention, there is provided the acquisition device of another digital image data.

The acquisition device of digital image data according to embodiments of the present invention includes：Second opening module, for figure After sending m-th line synchronising signal as sensor, ultraviolet source is opened, wherein, ultraviolet source is to be scanned for irradiating For bill so that imaging sensor gathers the ultraviolet light image of bill to be scanned, M is positive integer；Second closedown module, for stating When imaging sensor sends M+N line synchronising signal, start the first timing, when the first timing reaches the first preset duration, Ultraviolet source is closed, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, small In the work period of the M+N line synchronising signal；Second acquisition module, for obtaining the work with the M+N line synchronising signal Ultraviolet light digital image data corresponding to cycle；3rd opening module, for sending j-th of row synchronously letter to imaging sensor After number, white light source is opened, and starts the second timing when opening white light source, wherein, white light source is used to irradiate to wait to sweep Bill is retouched so that imaging sensor gathers the White-light image of bill to be scanned, j is positive integer；3rd closedown module, for when the Two timing close white light source when reaching the second preset duration, wherein, the second preset duration is less than the work of j-th of line synchronising signal Make the cycle；3rd acquisition module, for obtaining White Light Digital picture number corresponding with the work period of j-th of line synchronising signal According to；4th opening module, for imaging sensor send k-th of line synchronising signal after, open infrared light light source, and Start the 3rd timing when opening infrared light light source, wherein, infrared light light source is used to irradiate bill to be scanned so that imaging sensor The infrared light image of bill to be scanned is gathered, k is positive integer；4th closedown module, for being preset when the 3rd timing reaches the 3rd Infrared light light source is closed during duration, wherein, the 3rd preset duration is less than the work period of k-th of line synchronising signal；4th obtains Module, for obtaining infrared light digital image data corresponding with the work period of k-th of line synchronising signal.

Preferably, M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.

By the embodiment of the present invention, using after m-th line synchronising signal is sent to imaging sensor, ultraviolet light is opened Light source, wherein, ultraviolet source is used to irradiate bill to be scanned the ultraviolet light figure so that imaging sensor gathers bill to be scanned Picture, M are positive integer；When sending M+N line synchronising signal to imaging sensor, start the first timing, when the first timing is arrived During up to the first preset duration, ultraviolet source is closed, wherein, N is positive integer, and it is synchronous that the first preset duration is more than the M+N row The pulse width of signal, less than the work period of the M+N line synchronising signal；Obtain the work with the M+N line synchronising signal Ultraviolet light digital image data corresponding to cycle, the image reading mode solved in correlation technique are difficult to by acquired ticket According to image zooming-out bill fluorescent fiber silk feature the problem of, and then can clearly display what it was included in digital picture Fluorescent fiber silk, and the brightness of the background parts in digital picture in addition to fluorescent fiber silk is unaffected.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain 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 embodiments of the present invention；

Fig. 2 is the internal structure composition schematic diagram of the acquisition device of digital image data according to embodiments of the present invention；

Fig. 3 is the flow chart of the acquisition methods of digital image data according to embodiments of the present invention；

Fig. 4 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention one；

Fig. 5 is that the acquisition methods of the digital image data according to the preferred embodiment of the invention using shown in Fig. 4 are gathering During some row ultraviolet light images, the timing diagram of the control signal of the acquisition device of digital image data；

Fig. 6 is the flow chart of the acquisition methods of another digital image data according to embodiments of the present invention；

Fig. 7 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention two；

Fig. 8 is that the acquisition methods of the digital image data according to the preferred embodiment of the invention based on shown in Fig. 7 are gathering Some row White-light images, some row infrared light images, and during some row ultraviolet light images, the acquisition device of digital image data Control signal timing diagram；

Fig. 9 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention three；

Figure 10 is the structured flowchart of the acquisition device of digital image data according to embodiments 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 digital image data according to embodiments of the present invention.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the feature in embodiment and embodiment in the application can be mutually combined.

Fig. 1 is the module composition schematic diagram of the acquisition device of digital image data according to embodiments of the present invention, such as Fig. 1 institutes Show, the acquisition device 100 of digital image data can include：Control unit 11, communication unit 12, supply unit 13, image pass Sensor 14, modulus (AD) converter 15, memory 16 and sensor unit 17.

Control unit 11, for controlling other each modules to perform work, such as：Control unit 11 controls communication unit 12 to hold Data between the acquisition device 100 of row digital image data and the main frame being connected with the acquisition device 100 of digital image data Interaction, control unit 11 control supply unit 13 drive digital image-carrier (such as：The financial documents such as check, draft or other Type bill) moved in the transfer passage of the acquisition device 100 of digital image data, control unit 11 controls imaging sensor Optical imagery in 14 collection digital picture carriers to be scanned etc..

Communication unit 12, for performing the acquisition device 100 of digital image data and being filled with the acquisition of digital image data The data interaction between the main frame of 100 connections is put, such as：Communication unit 12 receives the control of the startup image scanning sent by main frame The digital image data that a/d converter 15 exports is uploaded to main frame etc. by system order, communication unit 12.

Supply unit 13, for driving digital image-carrier in the transfer passage of the acquisition device 100 of digital image data Middle movement, supply unit 13 can include motor driver 131, feeder motor 132, feed roller assembly 133.Motor driver 131, for exported according to control unit 11 control signal output feeder motor 132 output shaft rotation required for electric current, The output shaft of feeder motor 132 is connected with feed roller assembly 133, when the output shaft rotation of feeder motor 132, conveying roller The concomitant rotation of component 133, so as to drive digital image-carrier to be moved in transfer passage.

Imaging sensor 14, for reading the optical imagery of digital picture carrier to be scanned, and by acquired optical signal It is converted into analog electrical signal, i.e. analog picture signal.Imaging sensor 14 is linear imaging sensor, and it can be Charged Couple Imaging sensor (Charge-coupled Device, referred to as CCD) or contact-type image sensor (Contact Image Sensor, referred to as CIS), in the preferred embodiment, imaging sensor 14 is CIS.Imaging sensor 14 can include luminous Device 141 and photosensitive array 142, photophore 141, for launching the reflected light being radiated on digital picture carrier to be scanned.It is preferred that Ground, photophore 141 can include more sub- photophores, such as：UV-light luminous device 141a, white-light emitting device 141b and infrared light Photophore 141c, wherein, UV-light luminous device 141a, for launching the ultraviolet light being radiated on digital picture carrier to be scanned, White-light emitting device 141b, for launching the white light being radiated on digital picture carrier to be scanned, infra red light emitter 141c, it is used for Transmitting is radiated at infrared light on digital picture carrier to be scanned, every sub- photophore can be along main scanning direction (i.e. with The vertical direction of digital picture carrier conveying direction) extension line source.The line source can be made up of pointolite array, also may be used With the line source that to be spot light change through light-strip or light guide plate；Photosensitive array 142 is formed by the arrangement of multiple photoreceptors, multiple senses Light device is used to receive the light launched via the photophore 141 of digital picture carrier to be scanned reflection and is converted into analog image Signal, so as to realize the reflected image for reading digital picture carrier to be scanned, wherein, when photoreceptor is received via numeral to be scanned Realized during the ultraviolet light of the UV-light luminous device 141a transmittings of image-carrier reflection and read the ultraviolet of digital picture carrier to be scanned Light reflected image, when photoreceptor receives the white light via the white-light emitting device 141b transmittings of digital picture carrier to be scanned reflection The white light reflectance image for reading digital picture carrier to be scanned is realized, when photoreceptor reception is anti-via digital picture carrier to be scanned The infrared light reflection image for reading digital picture carrier to be scanned is realized during the infrared light for the infra red light emitter 141c transmittings penetrated, Multiple photoreceptors arrange along main scanning direction, wherein, some row pixels of each photoreceptor and digital picture carrier to be scanned In a pixel it is corresponding.

The control signal of photophore 141 includes the control signal to each sub- photophore, for whether controlling each sub- photophore Launch corresponding reflected light, such as：When every sub- photophore receives the first corresponding control letter of control unit output Number (such as：High level) when launch corresponding reflected light, when every sub- photophore receives the corresponding of control unit output The second control signal (such as：Low level) when stop launching corresponding reflected light；The control signal of photosensitive array 142 includes row Synchronizing signal SI and point synchronizing signal CLK, when photosensitive array 142 receives the effective line synchronising signal of the output of control unit 11 SI (such as：High level) after, start to start the optical image acquisition of some row pixels of digital picture carrier surface to be scanned simultaneously Analog picture signal is exported, wherein, photosensitive array 142 is receiving each effective point synchronizing signal of the output of control unit 11 CLK (such as：Rising edge) when, the optical imagery of one pixel of collection.Preferably, synchronizing signal CLK is put in digital picture number According to acquisition device 100 on continue to send to the photosensitive array 142 of imaging sensor 14 from control unit 11 after electricity.

A/d converter 15, the analog picture signal for being exported to imaging sensor 14 are AD converted, and generate digitized map As data, the control signal of a/d converter 15 includes reading enable signal OE, is exported when a/d converter 15 receives control unit 11 Effective reading enable signal OE (such as：Low level) when, a/d converter 15 exports analog picture signal is AD converted after The digital image data of generation, when a/d converter 15 receives the invalid reading enable signal OE of the output of control unit 11 (such as height Level) when, a/d converter 15 is unable to output digital image data.

Memory 16, control program and control program for the acquisition device 100 that stores digital image data were run The data and variable generated in journey, such as：Memory 16 is used to storing preset time T 1, preset time T 2, preset time T 3, pre- If time T4, and digital image data exported for storing a/d converter 15 etc., wherein, preset time T 1 is image sensing The line synchronising signal SI of device 14 work period, i.e. imaging sensor 14 gather some row pixels of digital picture carrier to be scanned The read cycle during analog image of point, after the model determination of imaging sensor 14, preset time T 1 passes through access by designer The databook of imaging sensor 14 is determined and stored in memory 16；Preset time T 2 is the close moment of ultraviolet source With sending the time difference between last line synchronising signal SI moment before the moment, wherein, ultraviolet source shines for transmitting The luminaire for the ultraviolet light penetrated on digital picture carrier, ultraviolet source can be the ultra-violet light-emitting device of imaging sensor 14 141a, or the arbitrary source being arranged in the transfer passage of the acquisition device 100 of digital image data；Preset time T 3 The fluorescent lifetime of white light source during to gather the White-light image of some row pixels of digital picture carrier, wherein, white light source The luminaire for the white light being radiated at for transmitting on digital picture carrier, white light source can be that the white light of imaging sensor 14 is sent out Light device 141b, or the arbitrary source being arranged in the transfer passage of the acquisition device 100 of digital image data；When default Between T4 be collection digital picture carrier some row pixels infrared light image when infrared light light source fluorescent lifetime, wherein, Infrared light light source is radiated at the luminaire of the infrared light on digital picture carrier for transmitting, and infrared light light source can be that image passes The infra red light emitter 141c of sensor 14, or be arranged in the transfer passage of acquisition device 100 of digital image data Arbitrary source.

Sensor unit 17, for detecting position of the digital picture carrier to be scanned in transfer passage, sensor unit 17 can include：First sensor 171, second sensor 172 and 3rd sensor 173.Each sensor of sensor unit 17 Can be optoelectronic reflection sensor or photoelectricity transmission sensor, each sensor includes photophore and receiver (does not show in figure Go out), receiver receives the light of photophore transmitting and is translated into electric signal, when sensor is in covered state, receives Device exports first detection signal, and when sensor, which is in, is uncovered state, receiver exports the second detection signal.First sensing Device 171, second sensor 172 and second sensor 173 are located at the diverse location in transfer passage, and the state of each sensor becomes Change the test position that can serve to indicate that digital picture carrier reaches or left the sensor, when sensor is by being uncovered state Show that digital picture carrier reaches the test position of the sensor when changing to covered state, when sensor is by covered state Change to the test position for showing that digital picture carrier leaves the sensor when being uncovered state.

Preferably, the acquisition device 100 of digital image data can also include：Arbitrary source 18, arbitrary source 18 are set It is oppositely arranged in transfer passage and with imaging sensor 14, for launching the transmission being radiated on digital picture carrier to be scanned Light, the optical imagery for reading digital picture carrier to be scanned is realized to coordinate with the photosensitive array 142 of imaging sensor 14, its In, the photosensitive array 142 of imaging sensor 14 receives the light for the transmitting of arbitrary source 18 for passing through digital picture carrier to be scanned simultaneously Analog picture signal is converted into, so as to realize the transmission image for reading digital picture carrier to be scanned.Further, it is independent Light source 18 can include：More sub- arbitrary sources, such as：Independent ultraviolet source 18a, independent white light source 18b and independence are red Outer radiant 18c, wherein, independent ultraviolet source 18a is used to launch the ultraviolet light being radiated on digital picture carrier to be scanned, Independent white light source 18b is used to launch the white light being radiated on digital picture carrier to be scanned, and independent infrared light light source 18c is used for Transmitting is radiated at the infrared light on digital picture carrier to be scanned.Carried when photosensitive array 142 receives through digital picture to be scanned The ultraviolet light transmission figure for reading digital picture carrier to be scanned is realized during the ultraviolet light of the independent ultraviolet source 18a transmittings of body Picture, realize and read when photosensitive array 142 receives the white light through the independent white light source 18b transmittings of digital picture carrier to be scanned The white light transmittant image of digital picture carrier to be scanned is taken, when photosensitive array 142 is received through digital picture carrier to be scanned The infrared transmission image for reading digital picture carrier to be scanned is realized during the infrared light of independent infrared light light source 18c transmittings.Solely The control signal of vertical light source 18 includes the control signal of each sub- arbitrary source, for controlling whether each sub- arbitrary source is launched accordingly Transmitted light, such as：When every sub- arbitrary source receives the first corresponding control signal (example of control unit output Such as：High level) when launch corresponding transmitted light, when every sub- arbitrary source receives corresponding the of control unit output Two control signals (such as：Low level) when stop launching corresponding transmitted light.

Fig. 2 is the internal structure composition schematic diagram of the acquisition device of digital image data according to embodiments of the present invention.Such as Shown in Fig. 2, direction shown in arrow A is the paper feed direction of digital picture carrier, is numeral with direction in opposite direction shown in arrow A Image-carrier moves back paper direction, first sensor 171, second sensor 172, imaging sensor 14 and 3rd sensor 173 It is arranged in successively in transfer passage along paper feed direction.Feed roller assembly 133 can include：It is arranged in conveying successively along paper feed direction Conveying roller 1331, conveying roller 1332, conveying roller 1333 and conveying roller 1334 in passage, wherein, each conveying roller can include：Phase To the drive roll and driven voller of setting, each drive roll is connected with feeder motor 132, the output shaft rotation of feeder motor 132 When, the drive roll concomitant rotation of each conveying roller, so as to drive digital image-carrier to be moved in transfer passage.Digital picture carrier When being moved in transfer passage, its surface to be scanned is relative with the photosensitive array 142 of imaging sensor 14, and imaging sensor 14 is adopted Collect the optical imagery on the surface to be scanned of digital picture carrier.First sensor 171 is located at the entrance P of transfer passage, is used for Detect whether that digital picture carrier is fed through the entrance P of transfer passage, second sensor 172 is located at image along paper feed direction The upstream of sensor 14, and the distance between scan position of its test position and imaging sensor 14 is L1,3rd sensor 173 are located at the downstream of imaging sensor 14 along paper feed direction, wherein, the scan position of imaging sensor 14 is its photosensitive array 142 position in transfer passage, due to imaging sensor when digital picture carrier is located at the scan position of imaging sensor 14 14 could gather the optical imagery of digital picture carrier, and therefore, the scan position of imaging sensor 14 is also known of digital picture The scanning starting position of the acquisition device 100 of carrier digital image data.

During being preferable to carry out, the module composition signal of the acquisition device of the digital image data shown in above-mentioned Fig. 1 Figure and Fig. 2 shown in digital image data acquisition device internal structure composition schematic diagram can apply finance or its The genuine/counterfeit discriminating scene of his type bill, for example, the acquisition device of digital image data is financial document image-reading device.Under So that digital picture carrier is bill as an example and with reference to above-mentioned Fig. 1 and Fig. 2 in papers the application of scene will be distinguished to this in text The technical scheme that inventive embodiments are provided is illustrated, but it does not form the improper restriction to the present invention.

Fig. 3 is the flow chart of the acquisition methods of digital image data according to embodiments of the present invention.As shown in figure 3, the party Method can include following processing step：

Step S302：After m-th line synchronising signal is sent to imaging sensor, ultraviolet source is opened, wherein, it is purple Outer radiant is used to irradiate bill to be scanned the ultraviolet light image so that imaging sensor gathers bill to be scanned, and M is positive integer；

Step S304：When sending M+N line synchronising signal to imaging sensor, start the first timing, when the first meter When reaching the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is more than the M+N row The pulse width of synchronizing signal, less than the work period of the M+N line synchronising signal；

Step S306：Obtain ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal.

Image reading mode in correlation technique is difficult to the fluorescent fiber silk that bill is extracted by acquired bill images Feature.Using method as shown in Figure 3, the fluorescent lifetime T of ultraviolet source_LEDuvIt is arranged to meet N*T1 ＜ T_LEDuv＜ (N+ 1) * T1, wherein, N is positive integer, and T1 is the work period of the line synchronising signal of imaging sensor, by setting suitable N values i.e. It can ensure that the UV energy that fluorescent fiber silk acquisition to be scanned is enough when sending M+N line synchronising signal and send visible Fluorescence, therefore, some row digital pictures for the a/d converter output read and stored after the M+N line synchronising signal is sent Included fluorescent fiber silk can be clearly displayed, the work week of the line synchronising signal due to imaging sensor need not be changed Phase, therefore, in some row digital pictures for the a/d converter output read and stored after sending the M+N line synchronising signal The brightness of background parts in addition to fluorescent fiber silk is unaffected.Thus the image reading mode solved in correlation technique is difficult to The problem of fluorescent fiber silk feature of bill being extracted by acquired bill images, and then can be in digital picture clearly Its fluorescent fiber silk included is shown, and the brightness of the background parts in digital picture in addition to fluorescent fiber silk is not by shadow Ring.

Preferably, in step S306, ultraviolet light numeral corresponding with the work period of the M+N line synchronising signal is obtained View data may comprise steps of：

Step S1：At the end of the work period of the M+N line synchronising signal, read and store the one of a/d converter output Point row ultraviolet light digital image data.

Preferably, in step sl, some row ultraviolet light digital image datas for reading and storing a/d converter output can With including one of in the following manner：

Mode one, the work period in m-th line synchronising signal to each line synchronising signal of the M+N line synchronising signal At the end of read and store a/d converter output some row digital image datas, wherein, some line number words stored every time The digital image data that view data is stored to the last time covers, to send m-th line synchronising signal to M+N Only it is stored with after individual line synchronising signal, in memory and reads and deposit at the end of the work period of the M+N line synchronising signal Some row ultraviolet light digital image datas of the a/d converter output of storage；

Mode two, only at the end of the work period of the M+N line synchronising signal, read and store a/d converter output Some row ultraviolet light digital image datas.

Fig. 4 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention one.Such as Fig. 4 institutes Show, the image reading method can be used for read bill some row pixels ultraviolet light image, this method can including with Lower processing step：

Step S402：First line synchronising signal is sent to imaging sensor.

Control unit sends first line synchronising signal to start the one of imaging sensor collection bill to imaging sensor The analog image of point row pixel.Control unit starts the 4th meter after first line synchronising signal is sent to imaging sensor When.In the present embodiment, M is equal to 1.

Refer to control unit to image it should be noted that control unit sends a line synchronising signal to imaging sensor Sensor sends an effective horizontal synchronizing pulse, i.e., control unit sends inactive level to imaging sensor under default situations (such as：Low level) line synchronising signal, when need start imaging sensor collection bill some row pixels simulation drawing During picture, control unit to imaging sensor send significant level (such as：High level) line synchronising signal, and make the significant level The pulse width persistently set, the line synchronising signal of inactive level is then sent to imaging sensor, to complete a row synchronization The transmission of signal.

Step S404：The first control signal is sent to ultraviolet source to open ultraviolet source.

Control unit sends the first control signal to open ultraviolet source to ultraviolet source, launches ultraviolet source The ultraviolet light being radiated on bill to be scanned, wherein, ultraviolet source sets for the luminous of ultraviolet light that transmitting is radiated on bill It is standby.Ultraviolet source can be the ultra-violet light-emitting device 141a of above-mentioned imaging sensor 14, or be arranged on bill digitized map As the acquisition device of data transfer passage in independent ultraviolet source 18a.

Step S406：Second to the 4th line synchronising signal is sent to imaging sensor.

When the 4th timing reaches preset time T 1, control unit is same to imaging sensor second to the 4th row of transmission Walk signal, in the present embodiment, N=3.Control unit carries out clear when the 4th timing reaches preset time T 1 every time to the 4th timing Zero, then send next line synchronising signal and restart the 4th timing, so as to ensure the work week of each line synchronising signal Phase is preset time T 1.After control unit sends the 4th line synchronising signal, start the first timing.

Step S408：The second control signal is sent to ultraviolet source to close ultraviolet source.

When the first timing reaches preset time T 2, control unit sends the second control signal to close to ultraviolet source Ultraviolet source, ultraviolet source is set to stop the ultraviolet light that transmitting is radiated on bill to be scanned, wherein, 0 ＜ T2 ＜ T1, preferably Ground, T1/3 ＜ T2 ＜ T1.

Because control unit opens ultraviolet source after first line synchronising signal is sent, the 4th row synchronization is being sent Preset time T 2 is spaced after signal and closes ultraviolet source, therefore, 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 image sensing The work period of the line synchronising signal of device.

Step S410：Read some row digital image datas of a/d converter output and be stored in memory.

Control unit reads some row digital image datas of a/d converter output and saved it in memory, that is, controls Unit processed reads and stores some row digital image datas of a/d converter output after the 4th line synchronising signal of transmission.Control is single Member can be realized reading by different modes and store some line numbers of a/d converter output after the 4th line synchronising signal of transmission Word view data, such as：The reading enable signal OE of a/d converter is arranged to significant level by control unit all the time, and every sending Some row digitized maps of a/d converter output are read in the 4th timing started after individual line synchronising signal when reaching preset time T 1 As data, by the every bit row digital image data read storage in memory, and every bit row digital picture is being stored Identical initial memory address is set during data, that is, the latter point row digital image data read is by former point row digital picture Data cover, last point line number word picture number is only stored in the 4th line synchronising signal background storage is sent so as to realize According to；Preferably, the reading enable signal OE of a/d converter is arranged to invalid by control unit before first line synchronising signal is sent Level, the reading of a/d converter is made when the 4th timing started after sending the 4th line synchronising signal reaches preset time T 1 Energy signal OE is arranged to significant level, and some row digital image datas for reading a/d converter output simultaneously save it in memory In.

Fig. 5 is that the acquisition methods of the digital image data according to the preferred embodiment of the invention using shown in Fig. 4 are gathering During some row ultraviolet light images, the timing diagram of the control signal of the acquisition device of digital image data.As shown in figure 5, row is synchronous Signal SI work period T1 is 200 μ s, and the close moment of ultraviolet source is synchronous with sending last row before the moment The signal moment, that is, the time difference T2 sent between the 4th line synchronising signal moment is 120 μ s.Control unit sends first row Set after synchronizing signal ultraviolet source control signal LEDuv be high level to open ultraviolet source, meanwhile, at interval of one Line synchronising signal SI work period T1 sends a line synchronising signal, after the 4th line synchronising signal is sent, and with transmission 4th (the i.e. 120 μ s) moment of line synchronising signal time at intervals preset time T 2, control unit set ultraviolet source to control letter Number LEDuv be low level to close ultraviolet source, and after the 4th line synchronising signal is sent, and same with the 4th row of transmission (the i.e. 200 μ s) moment of signal time at intervals preset time T 1 is walked, the reading enable signal for setting a/d converter is effective low level To read some row digital image datas of a/d converter output.As can be seen here, the ultraviolet light image of some row pixels is gathered During, the fluorescent lifetime T of ultraviolet source_LEDuv=3*T1+T2=720 μ s.After sending the 4th line synchronising signal, When startup imaging sensor gathers some row pixel analog images, this point row pixel of bill to be scanned is ultraviolet The light irradiation work period of three line synchronising signals, therefore, embedded fluorescent fiber silk obtains foot in this row pixel Enough energy and send visible fluorescence, therefore, imaging sensor can gather the glimmering of bill after sending the 4th line synchronising signal The image of fiber optics silk.Simultaneously as the work period of line synchronising signal does not extend so that is removed in the bill images gathered Background parts brightness outside fluorescent fiber silk is relatively low.Therefore, the bill images acquired in it have higher contrast, so as to Easily to extract the fluorescent fiber silk feature of bill by the bill images.

Fig. 6 is the flow chart of the acquisition methods of another digital image data according to embodiments of the present invention.Such as Fig. 6 institutes Show, this method can include following processing step：

Step S602：After m-th line synchronising signal is sent to imaging sensor, ultraviolet source is opened, wherein, it is purple Outer radiant is used to irradiate bill to be scanned the ultraviolet light image so that imaging sensor gathers bill to be scanned, and M is positive integer；

Step S604：When sending M+N line synchronising signal to imaging sensor, start the first timing, when the first meter When reaching the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is more than the M+N row The pulse width of synchronizing signal, less than the work period of the M+N line synchronising signal；

Step S606：Obtain ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal；

Step S608：After j-th of line synchronising signal is sent to imaging sensor, white light source is opened, and opening Start the second timing during white light source, wherein, white light source is used to irradiate bill to be scanned so that imaging sensor gathers waits to sweep The White-light image of bill is retouched, j is positive integer；

Step S610：White light source is closed when the second timing reaches the second preset duration, wherein, the second preset duration is small In the work period of j-th of line synchronising signal；

Step S612：Obtain White Light Digital view data corresponding with the work period of j-th of line synchronising signal；

Step S614：After k-th of line synchronising signal is sent to imaging sensor, infrared light light source is opened, and opening Start the 3rd timing when opening infrared light light source, wherein, infrared light light source is used to irradiate bill to be scanned so that imaging sensor is adopted Collect the infrared light image of bill to be scanned, k is positive integer；

Step S616：Infrared light light source is closed when the 3rd timing reaches three preset durations, wherein, the 3rd preset duration Less than the work period of k-th of line synchronising signal；

Step S618：Obtain infrared light digital image data corresponding with the work period of k-th of line synchronising signal.

During being preferable to carry out, M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.

It should be noted that obtain infrared light digital image data, White Light Digital view data and ultraviolet light digitized map As three processes of data are separate and do not have a sequencing.Above preferred embodiment of the present invention according to white light number Word view data, infrared light digital image data and ultraviolet light digital image data are only a kind of preferable execution sequences, its Do not form inappropriate limitation of the present invention.Any combination output order of three kinds of digital image datas is in the protection of the present invention Within the scope of.

Fig. 7 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention two.Such as Fig. 7 institutes Showing, the image reading method is used to drive bill in transfer passage during mobile some row pixels in supply unit, White-light image, infrared light image and the ultraviolet light image of this point row pixel of bill are read respectively, and this method can wrap Include following processing step：

Step S702：First line synchronising signal is sent to imaging sensor, controls the luminous preset time T 3 of white light source, Read and store some row White Light Digital view data of a/d converter output.

Control unit sends first line synchronising signal to start the one of imaging sensor collection bill to imaging sensor The optical imagery of point row pixel, also, after sending first line synchronising signal to imaging sensor, control unit is to white light light Source sends the first control signal to open white light source, wherein, white light source is radiated at the luminous of the white light on bill for transmitting Equipment, white light source can be the white-light emitting device 141b of imaging sensor 14, or be arranged on digital image data Independent white light source 18b in the transfer passage of acquisition device.

Control unit starts the 4th timing when sending first line synchronising signal to imaging sensor, and to white light After light source sends the first control signal, start the second timing, and sent out to white light source when the second timing reaches preset time T 3 The second control signal is sent to close white light source, wherein, T3 ＜ T1.When the 4th timing reaches preset time T 1, control unit Read the digital image data (more hereinafter referred to as row digital image data) of some row pixels of a/d converter output.Due to The white light source transmitting white light bill to be scanned before some digital image datas of a/d converter output are read, therefore, control The digital image data that unit processed is read is some row White Light Digital view data.

Step S704：Second line synchronising signal, the luminous preset time of control infrared light light source are sent to imaging sensor T4, read and store some row infrared light digital image datas of a/d converter output.

Control unit sends second line synchronising signal to start the one of imaging sensor collection bill to imaging sensor The optical imagery of point row pixel, also, after sending second line synchronising signal to imaging sensor, control unit is to infrared light Light source sends the first control signal to open infrared light light source, wherein, infrared light light source is radiated at infrared on bill for transmitting The luminaire of light, infrared light light source can be the infra red light emitter 141c of imaging sensor 14, or be arranged on number Independent infrared light light source 18c in the transfer passage of the acquisition device of word view data.

When control unit is to imaging sensor second line synchronising signal of transmission, start the 4th timing, to infrared light light source After sending the first control signal, start the 3rd timing, and sent to infrared light light source when the 3rd timing reaches preset time T 4 Second control signal to close infrared light light source, wherein, T4 ＜ T1.When the 4th timing reaches preset time T 1, control unit Read some row digital image datas of a/d converter output.Due to reading some line number word picture numbers of a/d converter output According to before, infrared light light source transmitting Infrared irradiation bill to be scanned, therefore, the digital image data that control unit is read is Some row infrared light digital image datas.

Step S706：The the 3rd to the 6th line synchronising signal is sent to imaging sensor, control ultraviolet source is luminous pre- If time T_LEDuv, and read after the 6th line synchronising signal is sent and store some row ultraviolet lights numeral of a/d converter output View data.

Control unit sends the 3rd to the 6th line synchronising signal to imaging sensor, and synchronously believes sending the 3rd row The first control signal is sent to open ultraviolet source to ultraviolet source after number, when sending the 6th line synchronising signal, is started First timing, the second control signal is sent to close ultraviolet light light to ultraviolet source when the first timing reaches preset time T 2 Source, that is, control the luminous preset time T of ultraviolet source_LEDuv, wherein, T_LEDuv=3*T1+T2.Also, control unit passes to image When sensor sends the 3rd line synchronising signal, start the 4th timing, when the 4th timing reaches preset time T 1, control unit is read Take and store some row digital image datas of a/d converter output, more i.e. row ultraviolet light digital image data.The step Specific execution method is referred to above-mentioned steps S402~step S410, and here is omitted.

As seen from the above, in the present embodiment, M is equal to 3, N and is equal to 3, j equal to 1, k equal to 2.

Fig. 8 is that the acquisition methods of the digital image data according to the preferred embodiment of the invention based on shown in Fig. 7 are gathering Some row White-light images, some row infrared light images, and during some row ultraviolet light images, the acquisition device of digital image data Control signal timing diagram.As shown in figure 8, OE is arranged to significant level (low electricity to the reading enable signal of a/d converter all the time It is flat), from control unit sends each line synchronising signal moment to imaging sensor, interval reaches preset time T 1, a/d converter Export some row digital image datas.White light source control signal is set after sending first line synchronising signal due to control unit LEDr/g/b is significant level (high level) and lasting preset time T 3, therefore, the first point row digitized map of a/d converter output As data L1 is White Light Digital view data.Infrared light light source control is set after sending second line synchronising signal due to control unit Signal LEDir processed is significant level (high level) and lasting preset time T 4, therefore, the second point line number word of a/d converter output View data L2 is infrared light digital image data.Afterwards, control unit retransmits the 3rd to the 6th line synchronising signal, and Ultraviolet source control signal LEDuv is set to be significant level (high level) and persistently preset after sending the 3rd line synchronising signal Time T_LEDuv, therefore, the 3rd to the 6th point row digital image data L3~L6 of a/d converter output is ultraviolet light digital picture Data, but control unit only stores the 6th line number word picture number of a/d converter output after the 6th line synchronising signal of transmission According to L6, because ultraviolet source has lighted three row cycles when control unit sends the 6th line synchronising signal, therefore, treat The fluorescent fiber silk included in some row pixels of scanning obtains enough energy and sends fluorescence, so control unit is read And the 6th point row digital picture stored can clearly display included fluorescent fiber silk.

Pass through the image reading method of the acquisition device of the digital image data of above preferred embodiment, digital image data Acquisition device realize bill some row pixels various light sources view data reading.

It should be noted that step S702, step S704 and step S706 are separate, i.e. step S702, step S704 and step S706 execution sequence can be any combination.

Fig. 9 is the flow chart according to the acquisition methods of the digital image data of the preferred embodiment of the present invention three.Such as Fig. 9 institutes Show, the acquisition methods of the digital image data be used to read view picture visible images, the view picture infrared light image of a bill with And view picture ultraviolet light image, this method can include following processing step：

Step S902：Perform initialization operation.

On the acquisition device of digital image data after electricity, control unit carries out related initialization, such as：Control unit is entered Initialization of the initialization of row correlated variables, the initialization of memory, and coherent signal etc., wherein, entering row related signal Initialization when, control unit according to the databook of imaging sensor set line synchronising signal pulse width and work week Phase, the pulse width for putting synchronizing signal and work period, and continue output point synchronization to imaging sensor by the setting work period Signal.

Step S904：The initiating terminal of bill is delivered to scanning starting position.

When control unit receives the control command for the startup image scanning that main frame is sent by communication unit, or, When control unit detects that bill is admitted to transfer passage by first sensor (such as：Detected when by first sensor When bill reaches the test position of first sensor), control unit control supply unit driving bill moves in transfer passage, The initiating terminal of bill is delivered to scanning starting position.

Preferably, when control unit by second sensor detect bill initiating terminal reach when second sensor detection During position, continue to drive bill movement pre-determined distance L1, so that bill initiating terminal reaches scanning starting position.

Step S906：Gather the digital image data of some row pixels.

Control unit sends N+3 line synchronising signal to imaging sensor, wherein, N is positive integer, and is sending first White-light emitting preset time T 3 is controlled to read and store some row White Light Digital figures of a/d converter output after line synchronising signal As data, control the luminous preset time T 4 of infrared light defeated to read and store a/d converter after second line synchronising signal is sent Some row infrared light digital image datas gone out, UV-light luminous preset time is controlled after the 3rd line synchronising signal is sent TLEDuv, and read after the N+3 line synchronising signal is sent and store some row ultraviolet light digitized maps of a/d converter output As data.The specific execution method of the step is with step S702~step S706, and here is omitted.

Step S908：Drive bill paper feed some row.

Control unit control supply unit drives bill to move some row along paper feed direction in transfer passage, that is, drives ticket According to the distance for moving some row pixels along paper feed direction in transfer passage.

Step S910：Judge whether bill leaves the scan position of imaging sensor.

Control unit detects the state of 3rd sensor, judges whether bill leaves the test position of 3rd sensor, when Detect that 3rd sensor is changed to by covered state when being uncovered state, judge that bill leaves the detection of 3rd sensor During position, now, control unit judges that bill has been moved off the scan position of imaging sensor, performs step S912；Otherwise, control Unit processed judges that bill does not leave the scan position of imaging sensor, continues executing with step S906.

Step S912, bill is sent out into transfer passage.

When judging that bill has been moved off the scan position of imaging sensor, control unit control supply unit driving bill Move so that bill is sent out into transfer passage, such as：Control unit control supply unit driving bill edge is moved back paper direction and moved, will Bill sends out output channel.

Figure 10 is the structured flowchart of the acquisition device of digital image data according to embodiments of the present invention.As shown in Figure 10, The acquisition device of the digital image data can include：First opening module 10, for sending m-th row to imaging sensor After synchronizing signal, ultraviolet source is opened, wherein, ultraviolet source is used to irradiate bill to be scanned so that imaging sensor is adopted Collect the ultraviolet light image of bill to be scanned, M is positive integer；First closedown module 20, for sending M+N to imaging sensor During individual line synchronising signal, start the first timing, when the first timing reaches the first preset duration, close ultraviolet source, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, less than the M+N line synchronising signal Work period；First acquisition module 30, for obtaining ultraviolet light numeral corresponding with the work period of the M+N line synchronising signal View data.

Using device as shown in Figure 10, the image reading mode solved in correlation technique is difficult to by acquired ticket According to image zooming-out bill fluorescent fiber silk feature the problem of, and then can clearly display what it was included in digital picture Fluorescent fiber silk, and the brightness of the background parts in digital picture in addition to fluorescent fiber silk is unaffected.

Preferably, the first acquisition module 30, at the end of the work period of the M+N line synchronising signal, reading simultaneously Store some row ultraviolet light digital image datas of a/d converter output.

Preferably, as shown in figure 11, the first acquisition module 30 can include：First acquisition unit 300, in each row Read at the end of the work period of synchronizing signal and store some row digital image datas of a/d converter output, wherein, every time The digital image data that some row digital image datas stored are stored to the last time covers, to send M The work week in the M+N line synchronising signal is only stored with after individual line synchronising signal to the M+N line synchronising signal, in memory Some row ultraviolet light digital image datas for the a/d converter output read and stored at the end of phase；Second acquisition unit 302, Some row for only at the end of the work period of the M+N line synchronising signal, reading and storing a/d converter output is ultraviolet Light digital image data.

Figure 12 is the structured flowchart of the acquisition device of another digital image data according to embodiments of the present invention.Such as Figure 12 Shown, the acquisition device of the digital image data can include：Second opening module 1202, for being sent to imaging sensor After m-th line synchronising signal, ultraviolet source is opened, wherein, ultraviolet source is used to irradiate bill to be scanned so that image Sensor gathers the ultraviolet light image of bill to be scanned, and M is positive integer；Second closedown module 1204, for image sensing When device sends M+N line synchronising signal, start the first timing, when the first timing reaches the first preset duration, close ultraviolet Radiant, wherein, N is positive integer, and the first preset duration is more than the pulse width of the M+N line synchronising signal, less than M+N The work period of line synchronising signal；Second acquisition module 1206, for obtaining the work period pair with the M+N line synchronising signal The ultraviolet light digital image data answered；3rd opening module 1208, for sending j-th of line synchronising signal to imaging sensor Afterwards, white light source is opened, and starts the second timing when opening white light source, wherein, white light source is to be scanned for irradiating For bill so that imaging sensor gathers the White-light image of bill to be scanned, j is positive integer；3rd closedown module 1210, for working as Second timing closes white light source when reaching the second preset duration, wherein, the second preset duration is less than j-th line synchronising signal Work period；3rd acquisition module 1212, for obtaining White Light Digital figure corresponding with the work period of j-th of line synchronising signal As data；4th opening module 1214, for after k-th of line synchronising signal is sent to imaging sensor, opening infrared light Light source, and start the 3rd timing when opening infrared light light source, wherein, infrared light light source is used to irradiate bill to be scanned so that figure As the infrared light image of sensor collection bill to be scanned, k is positive integer；4th closedown module 1216, for when the 3rd timing Infrared light light source is closed when reaching three preset durations, wherein, the 3rd preset duration is less than the work week of k-th of line synchronising signal Phase；4th acquisition module 1218, for obtaining infrared light digital picture number corresponding with the work period of k-th of line synchronising signal According to.

Preferably, M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.

As can be seen from the above description, above embodiments enable following technique effect (it should be noted that these Effect is the effect that some preferred embodiments can reach)：Using technical scheme provided in an embodiment of the present invention, M+ is being sent Some row digital pictures for the a/d converter output read and stored after N number of line synchronising signal, which can clearly display, to be included Fluorescent fiber silk, the work period of the line synchronising signal due to imaging sensor need not be changed, therefore, sending M+N Background in some row digital pictures for the a/d converter output read and stored after line synchronising signal in addition to fluorescent fiber silk Partial brightness is unaffected.Thus the image reading mode solved in correlation technique is difficult to by acquired bill images The problem of extracting the fluorescent fiber silk feature of bill, and then it is fine that the fluorescence that it is included can be clearly displayed in digital picture Silk is tieed up, and the brightness of the background parts in digital picture in addition to fluorescent fiber silk is unaffected.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (8)

1. A kind of 1. acquisition methods of digital image data, it is characterised in that including：

   After m-th line synchronising signal is sent to imaging sensor, ultraviolet source is opened, wherein, the ultraviolet source For irradiating bill to be scanned so that described image sensor gathers the ultraviolet light image of the bill to be scanned, M is positive integer；

   When sending M+N line synchronising signal to described image sensor, start the first timing, when first timing reaches During the first preset duration, the ultraviolet source is closed, wherein, N is positive integer, and first preset duration is more than the M+ The pulse width of N number of line synchronising signal, less than the work period of the M+N line synchronising signal；

   Obtain ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal；

   Wherein, obtaining ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal includes： At the end of the work period of the M+N line synchronising signal, read and store some row ultraviolet light numbers of a/d converter output Word view data.
2. 2. according to the method for claim 1, it is characterised in that read and store the more described of the a/d converter output Row ultraviolet light digital image data includes one below：

   Tied in the work period of the m-th line synchronising signal to each line synchronising signal of the M+N line synchronising signal Read during beam and store some row digital image datas of the a/d converter output, wherein, some line numbers stored every time The digital image data that word view data is stored to the last time covers, to send the m-th line synchronising signal After to the M+N line synchronising signal, the work period knot in the M+N line synchronising signal is only stored with memory Some row ultraviolet light digital image datas for the a/d converter output read and stored during beam；

   Only at the end of the work period of the M+N line synchronising signal, read and store some row of a/d converter output Ultraviolet light digital image data.
3. A kind of 3. acquisition methods of digital image data, it is characterised in that including：

   Step a：

   After m-th line synchronising signal is sent to imaging sensor, ultraviolet source is opened, wherein, the ultraviolet source For irradiating bill to be scanned so that described image sensor gathers the ultraviolet light image of the bill to be scanned, M is positive integer；

   When sending M+N line synchronising signal to described image sensor, start the first timing, when first timing reaches During the first preset duration, the ultraviolet source is closed, wherein, N is positive integer, and first preset duration is more than the M+ The pulse width of N number of line synchronising signal, less than the work period of the M+N line synchronising signal；

   Obtain ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal；

   Step b：

   After j-th of line synchronising signal is sent to described image sensor, white light source is opened, and opening the white light light Start the second timing during source, wherein, the white light source is used to irradiate the bill to be scanned so that described image sensor is adopted Collect the White-light image of the bill to be scanned, j is positive integer；

   The white light source is closed when second timing reaches the second preset duration, wherein, second preset duration is small In the work period of j-th of line synchronising signal；

   Obtain White Light Digital view data corresponding with the work period of j-th of line synchronising signal；

   Step c：

   After k-th of line synchronising signal is sent to described image sensor, infrared light light source is opened, and it is described infrared opening Start the 3rd timing during radiant, wherein, the infrared light light source is used to irradiate the bill to be scanned so that described image passes Sensor gathers the infrared light image of the bill to be scanned, and k is positive integer；

   The infrared light light source is closed when the 3rd timing reaches three preset durations, wherein, the 3rd preset duration Less than the work period of k-th of line synchronising signal；

   Obtain infrared light digital image data corresponding with the work period of k-th of line synchronising signal；

   Wherein, step a, step b and step c are performed in any order；

   Wherein, obtaining ultraviolet light digital image data corresponding with the work period of the M+N line synchronising signal includes： At the end of the work period of the M+N line synchronising signal, read and store some row ultraviolet light numbers of a/d converter output Word view data.
4. 4. according to the method for claim 3, it is characterised in that M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.
5. A kind of 5. acquisition device of digital image data, it is characterised in that including：

   First opening module, for after m-th line synchronising signal is sent to imaging sensor, opening ultraviolet source, its In, the ultraviolet source is used to irradiate bill to be scanned so that described image sensor gathers the ultraviolet of the bill to be scanned Light image, M are positive integer；

   First closedown module, for when sending M+N line synchronising signal to described image sensor, starting the first timing, When first timing reaches the first preset duration, the ultraviolet source is closed, wherein, N is positive integer, and described first is pre- If duration is more than the pulse width of the M+N line synchronising signal, less than the work week of the M+N line synchronising signal Phase；

   First acquisition module, for obtaining ultraviolet light digitized map corresponding with the work period of the M+N line synchronising signal As data；

   Wherein, first acquisition module, at the end of the work period of the M+N line synchronising signal, reading simultaneously Store some row ultraviolet light digital image datas of a/d converter output.
6. 6. device according to claim 5, it is characterised in that first acquisition module includes：

   First acquisition unit, it is synchronous for each row in the m-th line synchronising signal to the M+N line synchronising signal Read at the end of the work period of signal and store some row digital image datas of the a/d converter output, wherein, every time The digital image data that some row digital image datas stored are stored to the last time covers, to cause described in transmission After m-th line synchronising signal to the M+N line synchronising signal, only it is stored with memory synchronous in the M+N row Some row ultraviolet light digital image datas for the a/d converter output read and stored at the end of the work period of signal；

   Second acquisition unit, turn for only at the end of the work period of the M+N line synchronising signal, reading and storing AD Some row ultraviolet light digital image datas of parallel operation output.
7. A kind of 7. acquisition device of digital image data, it is characterised in that including：

   Second opening module, for after m-th line synchronising signal is sent to imaging sensor, opening ultraviolet source, its In, the ultraviolet source is used to irradiate bill to be scanned so that described image sensor gathers the ultraviolet of the bill to be scanned Light image, M are positive integer；

   Second closedown module, for when sending M+N line synchronising signal to described image sensor, starting the first timing, When first timing reaches the first preset duration, the ultraviolet source is closed, wherein, N is positive integer, and described first is pre- If duration is more than the pulse width of the M+N line synchronising signal, less than the work week of the M+N line synchronising signal Phase；

   Second acquisition module, for obtaining ultraviolet light digitized map corresponding with the work period of the M+N line synchronising signal As data；

   3rd opening module, for after j-th of line synchronising signal is sent to described image sensor, opening white light source, And start the second timing when opening the white light source, wherein, the white light source be used for irradiate the bill to be scanned with Described image sensor is set to gather the White-light image of the bill to be scanned, j is positive integer；

   3rd closedown module, for closing the white light source when second timing reaches the second preset duration, wherein, institute State the work period that the second preset duration is less than j-th of line synchronising signal；

   3rd acquisition module, for obtaining White Light Digital picture number corresponding with the work period of j-th of line synchronising signal According to；

   4th opening module, for after k-th of line synchronising signal is sent to described image sensor, opening infrared light light Source, and start the 3rd timing when opening the infrared light light source, wherein, the infrared light light source is described to be scanned for irradiating For bill so that described image sensor gathers the infrared light image of the bill to be scanned, k is positive integer；

   4th closedown module, for closing the infrared light light source when the 3rd timing reaches three preset durations, wherein, 3rd preset duration is less than the work period of k-th of line synchronising signal；

   4th acquisition module, for obtaining infrared light digital picture corresponding with the work period of k-th of line synchronising signal Data；

   Wherein, second acquisition module, at the end of the work period of the M+N line synchronising signal, reading simultaneously Store some row ultraviolet light digital image datas of a/d converter output.
8. 8. device according to claim 7, it is characterised in that M is the positive integer more than 2, and j is equal to M-2, and k is equal to M-1.