CN103914694A - Detection module, fingerprint sensing device and fingerprint image generating method - Google Patents
Detection module, fingerprint sensing device and fingerprint image generating method Download PDFInfo
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- CN103914694A CN103914694A CN201310001142.5A CN201310001142A CN103914694A CN 103914694 A CN103914694 A CN 103914694A CN 201310001142 A CN201310001142 A CN 201310001142A CN 103914694 A CN103914694 A CN 103914694A
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Abstract
The invention discloses a fingerprint sensing device which can generate a gray-scale image of a fingerprint and comprises a detection module and a control module. The detection module comprises a fingerprint sensing unit which detects the fingerprint and generates an original image signal, a signal amplifying unit which conducts amplifying to convert the original image signal into a gain image signal, a signal conversion unit which converts the gain image signal into a digital image signal with the corresponding specific gray-scale value, and a processing unit which receives the digital image signal and stores the digital image signal as fingerprint image information. The control module receives the fingerprint image information and judges whether the gray scale of the fingerprint image information is distributed evenly or not. If the gray scale of the fingerprint image information is not evenly distributed, the control module enables the detection module to reset a gain parameter or a deviation parameter and then rerun the fingerprint gray-scale image generation procedure.
Description
Technical field
The present invention relates to a kind of production method of fingermark image, particularly relate to and a kind of feedback setting by circuit parameter, with the fingermark image production method of the uniform original fingerprint image of output pixel gray-scale distribution.
Background technology
Identification of fingerprint is a kind of common biological characteristic identification technology, has been widely used at present the fields such as door safety management, electronic installation authentication, financial sector authentication and Criminal Investigation.According to the operation principles of identification of fingerprint, fingeprint distinguisher can be divided into the types such as optical profile type, temperature sensing formula, pressure-sensing formula and condenser type, but the operation workflow of above-mentioned various fingeprint distinguishers comprises obtaining of (1) original fingerprint image mostly; (2) the image pre-treatment of fingermark image; (3) eigenwert of fingermark image acquisition; And the eigenwert of (4) fingermark image is than reciprocity step.
In above-mentioned identification of fingerprint process, fingermark image can present with gray scale image conventionally, captures so that carry out fingerprint characteristic value the step of comparing with eigenwert.With the Pixel Information of the fingermark image of 8 bits, its each pixel has at most 256 kinds of GTG change color, and various GTG colors can 0～255 numeric representation, darker color (being defined as larger GTG value herein) is corresponding to the part of fingerprint peaks (Ridge), the more shallow part of corresponding fingerprint paddy (Valley) of color (being defined as less GTG value herein).
Consulting Fig. 1, is the pixel gray level value distribution plan of desirable fingermark image.With this fingermark image, its pixel gray level value is distributed in 3～250 scope, and almost each GTG value has corresponding pixel distribution, therefore except dark, the shallow portion of corresponding fingerprint peaks, paddy, also have the GTG color of other different levels, and can present the details of fingermark image.
But, the surface state of ambient temperature and humidity, finger, finger contact are in factors such as the property settings of situation (as area, angle, power), fingeprint distinguisher internal circuit and the sensor of fingeprint distinguisher, capital affects the gray-scale distribution state of original fingerprint image, makes fingeprint distinguisher be difficult for producing the desirable original fingerprint image of gray-scale distribution.
Consult Fig. 2～Fig. 4, be three original fingerprint images that gray-scale distribution is undesirable.The common issue of these three fingermark images is gray-scale distribution concentrations, fingerprint peaks, paddy depth degree partly are too approached and be difficult for identification feature, for example Fig. 3 is that fingermark image integral color is partially shallow, Fig. 4 is that fingermark image integral color is partially dark, and is unfavorable for the carrying out that fingerprint characteristic value acquisition and eigenwert are compared.
For the problems referred to above, generally can adopt image processing technique to adjust the GTG value of fingermark image, namely by image processing technique, original fingerprint image undesirable gray-scale distribution is adjusted into and is leveled off to after the state of Fig. 1, then carry out the step that fingerprint characteristic value acquisition and eigenwert are compared.But adjust in this way the gray-scale distribution of fingermark image, its treatment step is comparatively complicated, and be difficult for gray-scale distribution for example to readjust, as perfect condition (may cause fingermark image distortion because adjusting gray-scale distribution), and affect the correctness of subsequent fingerprint identification result.
Summary of the invention
The object of the present invention is to provide a kind of fingermark image production method, by the method, can obtain the uniform original fingerprint image of gray-scale distribution, and can omit follow-up GTG set-up procedure, and promote the correctness of identification of fingerprint result.
Another object of the present invention, is to provide a kind of fingerprint acquisition apparatus of carrying out aforementioned fingermark image production method.
The object of the invention to solve the technical problems realizes by the following technical solutions.Fingermark image production method of the present invention, is carried out by fingerprint acquisition apparatus.This fingerprint acquisition apparatus comprises detecting module and control module, and this detecting module comprises fingerprint sensing unit, signal amplification unit, signal conversion unit and processing unit.This fingermark image production method comprises following steps: (A) this fingerprint sensing unit detecting fingerprint, and output to original image signal that should fingerprint to this signal amplification unit; (B) this signal amplification unit, according to gain parameter, amplifies this original image signal to be converted to gain signal of video signal, and export this signal conversion unit to; (C) this signal conversion unit, according to migration parameter, is converted to the digital image signal of corresponding specific grey-scale value by this gain signal of video signal, and exports this processing unit to; (D) this processing unit will store the fingermark image communication of this digital image signal to this control module; (E) this control module judges that whether the gray-scale distribution of this fingermark image information is even; If judged result is "No", this control module is sent overhead control signal to this detecting module, makes this detecting module first reset the gain parameter of this signal amplification unit or the migration parameter of this signal conversion unit, and re-executes subsequently step (A).
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Preferably, by mean value or the weighted mean value of the GTG value of this fingermark image information in this control module of step (E), or maximal value and the minimum value of the GTG value of this fingermark image information, whether even to judge the gray-scale distribution of this fingermark image information.
Preferably, to be received by this processing unit at this overhead control signal of step (E), and this processing unit is exported respectively first and controlled signal to this signal amplification unit, or output second controls signal to this signal conversion unit, to carry out respectively resetting of this gain parameter or this migration parameter.
Preferably, this fingermark image information is corresponding to complete fingermark image.
Preferably, this fingermark image information is corresponding to local fingermark image, and in step (E) if this judged result is "Yes", execution step (F): this control module judges whether the quantity of fingermark image information is greater than one, if judged result is "No", re-execute step (A), to produce another different fingermark image information.
Preferably, in step (F), if judged result is "Yes", this control module is carried out the splice program of many different fingermark image information; And also comprise afterwards step (G) in step (F): this control module judges that whether the quantity of described many fingermark image information is enough, if judged result is "No", re-execute step (A).
The object of the invention to solve the technical problems also realizes by the following technical solutions.Fingerprint acquisition apparatus of the present invention, comprises detecting module and control module.This detecting module comprises fingerprint sensing unit, signal amplification unit, signal conversion unit and processing unit.Fingerprint sensing unit detecting fingerprint also produces corresponding original image signal.Signal amplification unit is electrically connected on this fingerprint sensing unit and receives this original image signal, and according to gain parameter, this original image signal is amplified and is converted to gain signal of video signal.Signal conversion unit is electrically connected on this signal amplification unit and receives this gain signal of video signal, and according to migration parameter, this gain signal of video signal is converted to the digital image signal of corresponding specific grey-scale value.Processing unit is electrically connected on this fingerprint sensing unit, this signal amplification unit and this signal conversion unit, and receives this digital image signal and save as fingermark image information.
Control module is electrically connected on this detecting module and receives this fingermark image information, and judges that whether the gray-scale distribution of this fingermark image information is even.If judge, the gray-scale distribution of this fingermark image information is inhomogeneous, this control module is sent overhead control signal to this detecting module, make this detecting module first reset the gain parameter of this signal amplification unit or the migration parameter of this signal conversion unit, and re-execute subsequently the grey-tone image generating routine of this fingerprint.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Whether preferably, this control module is by mean value or the weighted mean value of the GTG value of this fingermark image information, or maximal value and the minimum value of the GTG value of this fingermark image information, even to judge the gray-scale distribution of this fingermark image information.
Preferably, this overhead control signal is to be received by this processing unit, and this processing unit is exported respectively first and controlled signal to this signal amplification unit, or output second controls signal to this signal conversion unit, to carry out respectively resetting of this gain parameter or this migration parameter.
Preferably, this fingermark image information presents complete fingermark image.
Preferably, this fingermark image information presents local fingermark image, and this control module is also according to many different fingermark image information, splices complete fingermark image.
By technique scheme, beneficial effect of the present invention is: fingerprint acquisition apparatus is analyzed the gray-scale distribution of fingermark image information, and can reset after the gain parameter of signal amplification unit or the migration parameter of signal conversion unit, again carry out fingermark image generating routine, to obtain the uniform fingermark image information of gray-scale distribution, and can omit the program of adjusting gray-scale distribution by image processing technique, and promote the correctness of identification of fingerprint.
The object of the invention to solve the technical problems realizes by the following technical solutions again.
The detecting module of fingerprint acquisition apparatus of the present invention, it coordinates control module to use, for the grey-tone image that produces fingerprint.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Brief description of the drawings
Fig. 1～Fig. 4 is histogram, and the gray-scale distribution state of various fingermark images is described.
Fig. 5 is system diagram, and the embodiment of fingerprint acquisition apparatus of the present invention is described.
Fig. 6 is process flow diagram, and the first preferred embodiment of fingermark image production method of the present invention is described.
Fig. 7 is process flow diagram, and the second preferred embodiment of fingermark image production method of the present invention is described.
Embodiment
Technological means and effect of taking for reaching predetermined goal of the invention for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to embodiment, structure, feature and effect thereof of a kind of fingerprint acquisition apparatus proposing according to the present invention, be described in detail as follows.
Consult Fig. 5～Fig. 7, full width type fingerprint sensing (Area sensor) part that fingerprint acquisition apparatus 1 of the present invention comprises the first preferred embodiment, and the scratch type fingerprint sensing of the second preferred embodiment (Swipe sensor) part.What full width type fingerprint sensing referred to fingerprint acquisition apparatus 1 each acquisition is all a complete fingermark image; Scratch type fingerprint sensing refers to the each only local image of picking up fingerprint of fingerprint acquisition apparatus 1, and coordinating follow-up splice program by repeatedly continuous image capture program, the local fingerprint image that multiple are had to continuous relevance is integrated into a complete fingermark image.
Below consult Fig. 5 and Fig. 6, the first preferred embodiment of fingerprint acquisition apparatus 1 of the present invention is described.In the first preferred embodiment, fingerprint acquisition apparatus 1 adopts full width type fingerprint sensing technology, and the principle of its detecting fingerprint can be optical profile type, temperature sensing formula, pressure-sensing formula or condenser type, is not limited to particular type.
Fingerprint acquisition apparatus 1 comprises for detecting fingerprint and producing the detecting module 11 of fingermark image, and coordinates the control module 12 of detecting module 11 Collaboration.Detecting module 11 comprises fingerprint sensing unit 111, signal amplification unit 112, signal conversion unit 113, processing unit 114 and temporary storage location 115.
Fingerprint sensing unit 111 is electrically connected on signal amplification unit 112 and processing unit 114, and it has multiple sensing elements (not drawing in figure) that form image pixel with specific resolution (as 500DPI) configuration.The sensing element of fingerprint sensing unit 111 is detected after the fingerprint of its correspondence position, produces the original image signal of simulation, and subsequently original image signal is transferred to signal amplification unit 112, carries out signal handler.
Signal amplification unit 112 is electrically connected on fingerprint sensing unit 111, signal conversion unit 113 and processing unit 114, according to gain parameter (Gain) that can modulation, fingerprint sensing unit 111 is transmitted to the original image signal of coming and be enlarged into gain signal of video signal, and export signal conversion unit 113 to.For instance, signal amplification unit 112 can comprise multiple signal amplifier (Amplifier that are electrically connected on respectively aforementioned sensing element, in figure, do not draw), original image signal gain fainter signal intensity can be amplified, be beneficial to follow-up signal processing.
Signal conversion unit 113 is electrically connected on signal amplification unit 112 and processing unit 114, according to migration parameter (Offset) that can modulation, gain signal of video signal is converted to after the digital image signal of corresponding specific grey-scale value, exports processing unit 114 to.For instance, signal conversion unit 113 can be analog/digital converter (Analog-to-digital converter, ADC), the gain signal of video signal of simulation can be converted to digital image signal, and by the setting of migration parameter, make the digital image signal of various intensity correspond respectively to specific grey-scale value.In the present embodiment, the scope of GTG value be GTG value taking 8 order informations 0～255 as example, but be not limited to this, can be optionally and corresponding adjustment.
Processing unit 114 is electrically connected on fingerprint sensing unit 111, signal amplification unit 112, signal conversion unit 113, temporary storage location 115 and control module 12, can by digital image signal form fingermark image information temporary storage in temporary storage location 115, and by fingermark image communication to control module 12 for analysis.In addition, processing unit 114 also can send control signal, makes fingerprint sensing unit 111 carry out fingermark image detection procedure, or control signal amplifying unit 112, signal conversion unit 113 reset its gain parameter or migration parameter.In the present embodiment, processing unit 114 is control logic circuit (Control logic), and to carry out foregoing circuit function, but the embodiment of processing unit 114 is not as limit.
Control module 12 is electrically connected on processing unit 114, in the gray-scale distribution situation that receives its each pixel of fingermark image information post analysis.If the gray-scale distribution of fingermark image information is inhomogeneous, control module 12 is sent overhead control signal to processing unit 114, make processing unit 114 send first and control signal to signal amplification unit 112, or send second and control signal to signal conversion unit 113, and reset its gain parameter or migration parameter, and make subsequently detecting module 11 re-execute fingermark image detection process.That is to say, control module 12 must be carried out the pixel gray level analysis of fingermark image, and the instruction that resets of sending gain parameter, migration parameter according to GTG analysis result correspondence.
In the present embodiment, control module 12 can be microprocessing unit (Micro control unit, or CPU (central processing unit) (Central processing unit MCU), CPU), it is by analyzing mean value or the weighted mean value of the GTG value of each pixel in fingermark image information, or analyze maximal value and the minimum value of its GTG value, to judge the gray-scale distribution state of this fingermark image information.But except aforesaid way, control module 12 also can be passed through the gray-scale distribution of other algorithm analysis fingermark image information, is not limited in mode disclosed herein.
Below with reference to the process flow diagram of Fig. 6, the execution step of fingermark image production method of the present invention is described.
Step S1: fingerprint sensing unit 111, after detecting fingerprint, produces and export the original image signal of complete finger print to signal amplification unit 112.
Step S2: signal amplification unit 112, according to predetermined gain parameter, is enlarged into gain signal of video signal by original image signal, and exports signal conversion unit 113 to.
Step S3: signal conversion unit 113, according to predetermined migration parameter, is changed by gain signal of video signal the digital image signal that corresponding specific grey-scale distributes, and exported processing unit 114 to.
Step S4: processing unit 114 exports the fingermark image information of store digital signal of video signal to control module 12 for analysis.
Step S5: control module 12 is analyzed the gray-scale distribution of digital image signal.If the gray-scale distribution ideal of this digital image signal (pixel gray level value evenly drop on 0～255 scope in), completes the generation step of fingermark image.If the gray-scale distribution of this digital image signal is inhomogeneous, perform step S6, control module 12 is sent overhead control signal to processing unit 114.
Step S7: processing unit 114, according to this overhead control signal, first resets the gain parameter of signal amplification unit 112 or the migration parameter of signal conversion unit 113, and re-executes subsequently step S1.
For instance, if the gray-scale distribution concentrations of fingermark image is for example distributed in 120～185 interval, it is underused 0～255 GTG value scope and affects fingermark image resolution, and this sets bad result for gain parameter.Therefore, at step S5～S7, control module 12 resets after the gain parameter (herein for increasing signal magnification) of signal amplification unit 112 by processing unit 114, then re-executes step S1～step S4, can obtain preferably fingermark image information of gray-scale distribution.
The situation of another kind of gray-scale distribution concentrations is one side of the gray-scale distribution deflection 0 or 255 of fingermark image, for example pixel gray level value is distributed in 0～135 or 142～255 interval, the effect that fingermark image presents is for partially shallow or partially dark, and this is the bad result that causes gray-scale distribution skew of migration parameter setting.Therefore,, at step S5～S7, control module 12 makes signal conversion unit 113 reset after its migration parameter (increasing or reduce side-play amount), then re-executes step S1～step S4, can make the gray-scale distribution convergence ideal of fingermark image information.
In addition, also having a kind of situation is that the pixel gray level of fingermark image distributes in 0～255 the scope of dropping on, but GTG value 0 and 255(are complete white or entirely black) pixel quantity far more than the pixel of other GTG values, therefore the effect deflection that fingermark image presents is non-black white, the image detail that the pixel of other GTG colors can present is less, and affecting the correctness of identification of fingerprint, this is that gain parameter is set excessive caused result.Therefore, at step S5～S7, control module 12 is reset to the gain parameter of signal amplification unit 112 after less numerical value, and above-mentioned gray-scale distribution problem can be improved.
As aforesaid way, at step S1～S4, detecting module 11 is first carried out fingermark image generating routine one time, and this program can be considered the prescan program for correcting circuit pre-set parameter (gain parameter or migration parameter).Then, at step S5～S7, control module 12, according to the gray-scale distribution state of fingermark image, makes detecting module 11 adjust its gain parameter or migration parameter, and re-executes fingermark image generating routine one time again, and can obtain preferably fingermark image of gray-scale distribution.Depending on situation, above-mentioned flow process can be carried out repeatedly, until the gray-scale distribution of fingermark image is perfect condition.
In addition, undesirable when the gray-scale distribution of fingermark image, and need to carry out both setting program of gain parameter and migration parameter time, processing unit 114 can carry out the setting step of these two kinds of parameters simultaneously, or two kinds of parameters are set in gradation.That is to say, set at the same time under the situation of two kinds of parameters, carry out reset (simultaneously the sending the first control signal and the second control signal) of gain parameter and migration parameter at step S7 processing unit 114 simultaneously, and perform step once again subsequently S1～S4, and complete, primary parameter is set and fingermark image produces flow process.On the other hand, under the situation of setting in gradation, step S7 processing unit 114 first set two parameters one of them, perform step subsequently S1～S4, and post-processing unit 114 is set another parameter once again, and again perform step S1～S4, and complete one group of setting parameter and fingermark image generation flow process.Therefore, above-mentioned implementation content can optionally be set, and is not limited to ad hoc fashion.
According to above-mentioned explanation, in the first embodiment, fingerprint acquisition apparatus 1 adopts full width type fingerprint sensing technology, sets, and can produce the desirable fingermark image of gray-scale distribution by the back coupling of gain parameter and migration parameter.
Referring to Fig. 5 and Fig. 7, the second preferred embodiment of fingerprint acquisition apparatus 1 of the present invention is described.In the second preferred embodiment, fingerprint acquisition apparatus 1 adopts scratch type fingerprint sensing technology, its system architecture and the first embodiment are roughly the same, difference is: in the second embodiment, less and sensing element (not drawing in the figure) negligible amounts that comprises of the area of fingerprint sensing unit 111, user's finger must slowly move the generating routine to carry out multiple continuous and local fingermark images on fingerprint sensing unit 111, and fingerprint acquisition apparatus 1 also must, by the splice program of local fingerprint image, could produce a complete fingermark image.
The execution flow process of fingermark image production method is below described in the second embodiment of the present invention.
Step S1～S7 of step F 1～F7 and the first embodiment is similar, does not therefore repeat to repeat.In simple terms, export the original image signal of local fingerprint at step F 1 fingerprint sensing unit 111, carry out the program of similar step S2～S4 at step F 2～F4 detecting module 11.In step F 5, if control module 12 judges that the gray-scale distribution of fingermark image information is even, perform step F8: control module 12 judges whether the quantity of fingermark image information is greater than one, to judge whether to carry out the splicing of fingermark image.On the other hand, in step F 5, if control module 12 judges that the gray-scale distribution of fingermark image information is undesirable, the step F that continues 6～F7 also performs step F1～F4 again, this flow process constantly repeats, until control module 12 judges the gray-scale distribution state ideal of fingermark image information, till being enough to perform step F8.
In step F 8, if fingermark image information only has one, cannot carry out the splicing step of fingermark image information, re-execute step F 1, to obtain second fingermark image information.If fingermark image information has been accumulated more than two, perform step F9: control module 12 is carried out the splicing of fingermark image information.
Step F 10: control module 12 judges that whether the quantity of fingermark image information is enough, to judge that whether fingermark image is complete.If quantity is inadequate, re-execute step F 1, to obtain new fingermark image.
As above-mentioned, set by the back coupling of gain parameter and migration parameter at step F 1～F7 fingerprint acquisition apparatus 1, to produce the desirable local fingerprint image of gray-scale distribution.Above-mentioned steps must be carried out repeatedly repeatedly, until the quantity of local fingerprint image is enough to splice complete fingermark image, has just calculated overall fingermark image generating routine.But optionally,, fingermark image splicing step also can be carried out collecting after enough local fingerprint images again, is not limited with content disclosed herein.In addition, if user's finger leaves fingerprint sensing unit 111 places and interrupts sensing flow process, fingerprint acquisition apparatus 1 can be designed to the information of must deletion previously having obtained and re-execute sensing flow process, can also be designed can continue prestored message and continue to carry out sensing flow process, is not limited with ad hoc fashion.
In sum, in first, second preferred embodiment of the present invention, fingerprint acquisition apparatus 1 is by fingermark image production method of the present invention, the mode of setting with image prescan and circuit parameter back coupling, obtain the desirable fingermark image of gray-scale distribution, so need not readjust by image processing technique the gray-scale distribution of fingermark image, can carry out the program of the acquisition of fingermark image eigenwert and eigenwert comparison, and the overall step that can save identification of fingerprint, and promote the correctness of identification of fingerprint, therefore really can reach object of the present invention.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a fingermark image production method, carried out by fingerprint acquisition apparatus, this fingerprint acquisition apparatus comprises detecting module and control module, this detecting module comprises fingerprint sensing unit, signal amplification unit, signal conversion unit and processing unit, it is characterized in that, this fingermark image production method comprises following steps:
(A) this fingerprint sensing unit detecting fingerprint, and output to original image signal that should fingerprint to this signal amplification unit;
(B) this signal amplification unit, according to gain parameter, amplifies this original image signal to be converted to gain signal of video signal, and export this signal conversion unit to;
(C) this signal conversion unit, according to migration parameter, is converted to the digital image signal of corresponding specific grey-scale value by this gain signal of video signal, and exports this processing unit to;
(D) this processing unit will store the fingermark image communication of this digital image signal to this control module;
(E) this control module judges that whether the gray-scale distribution of this fingermark image information is even; If judged result is "No", this control module is sent overhead control signal to this detecting module, makes this detecting module first reset the gain parameter of this signal amplification unit or the migration parameter of this signal conversion unit, and re-executes subsequently step (A).
2. fingermark image production method as claimed in claim 1, it is characterized in that: be by mean value or the weighted mean value of the GTG value of this fingermark image information in this control module of step (E), or maximal value and the minimum value of the GTG value of this fingermark image information, whether even to judge the gray-scale distribution of this fingermark image information.
3. fingermark image production method as claimed in claim 1, it is characterized in that: be to be received by this processing unit at this overhead control signal of step (E), and this processing unit is exported respectively first and is controlled signal to this signal amplification unit, or output second controls signal to this signal conversion unit, to carry out respectively resetting of this gain parameter or this migration parameter.
4. fingermark image production method as claimed in claim 1, it is characterized in that: this fingermark image information presents local fingermark image, and in step (E) if this judged result is "Yes", execution step (F): this control module judges whether the quantity of fingermark image information is greater than one, if judged result is "No", re-execute step (A), to produce another different fingermark image information.
5. fingermark image production method as claimed in claim 4, is characterized in that: in step (F), if judged result is "Yes", this control module is carried out the splice program of many different fingermark image information; And also comprise afterwards step (G) in step (F): this control module judges that whether the quantity of described fingermark image information is enough, if judged result is "No", re-execute step (A).
6. a fingerprint acquisition apparatus, can produce the grey-tone image of fingerprint, it is characterized in that this fingerprint acquisition apparatus comprises:
Detecting module, comprises
Fingerprint sensing unit, detects this fingerprint and produces corresponding original image signal;
Signal amplification unit, is electrically connected on this fingerprint sensing unit and receives this original image signal, and according to gain parameter, this original image signal is amplified and is converted to gain signal of video signal;
Signal conversion unit, is electrically connected on this signal amplification unit and receives this gain signal of video signal, and according to migration parameter, this gain signal of video signal is converted to the digital image signal of corresponding specific grey-scale value; And
Processing unit, is electrically connected on this fingerprint sensing unit, this signal amplification unit and this signal conversion unit, and receives this digital image signal and save as fingermark image information; And
Control module, be electrically connected on this detecting module and receive this fingermark image information, and whether the gray-scale distribution that judges this fingermark image information is even, if judge, the gray-scale distribution of this fingermark image information is inhomogeneous, this control module is sent overhead control signal to this detecting module, make this detecting module first reset the gain parameter of this signal amplification unit or the migration parameter of this signal conversion unit, and re-execute subsequently the grey-tone image generating routine of this fingerprint.
7. fingerprint acquisition apparatus as claimed in claim 6, it is characterized in that: this control module is by mean value or the weighted mean value of the GTG value of this fingermark image information, or maximal value and the minimum value of the GTG value of this fingermark image information, whether even to judge the gray-scale distribution of this fingermark image information.
8. fingerprint acquisition apparatus as claimed in claim 6, it is characterized in that: this overhead control signal is to be received by this processing unit, and this processing unit is exported respectively first and is controlled signal to this signal amplification unit, or output second controls signal to this signal conversion unit, to carry out respectively resetting of this gain parameter or this migration parameter.
9. fingerprint acquisition apparatus as claimed in claim 6, is characterized in that: this fingermark image information presents local fingermark image, and this control module is also according to many different fingermark image information, splices complete fingermark image.
10. a detecting module for the fingerprint acquisition apparatus as described in any one in claim 6 to 9, is characterized in that, it coordinates control module to use, for the grey-tone image that produces fingerprint.
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| CN106066951A (en) * | 2016-05-24 | 2016-11-02 | 广东欧珀移动通信有限公司 | Unlocking screen method, image-pickup method and the device of a kind of electric terminal |
| WO2017096930A1 (en) * | 2015-12-08 | 2017-06-15 | 广东欧珀移动通信有限公司 | Control method, control device and electronic device |
| CN108537106A (en) * | 2017-03-01 | 2018-09-14 | 映智科技股份有限公司 | Fingerprint detection method and circuit thereof |
| CN112580597A (en) * | 2020-12-29 | 2021-03-30 | 深圳贝特莱电子科技股份有限公司 | Device and method for automatically adjusting fingerprint image brightness |
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| US10452886B2 (en) | 2015-12-08 | 2019-10-22 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Control method, control device, and electronic device |
| US10489624B2 (en) | 2015-12-08 | 2019-11-26 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Control method, control device and electronic device |
| CN106066951A (en) * | 2016-05-24 | 2016-11-02 | 广东欧珀移动通信有限公司 | Unlocking screen method, image-pickup method and the device of a kind of electric terminal |
| CN106066951B (en) * | 2016-05-24 | 2019-02-22 | Oppo广东移动通信有限公司 | A kind of unlocking screen method, image-pickup method and the device of electric terminal |
| CN108537106A (en) * | 2017-03-01 | 2018-09-14 | 映智科技股份有限公司 | Fingerprint detection method and circuit thereof |
| CN108537106B (en) * | 2017-03-01 | 2021-04-27 | 映智科技股份有限公司 | Fingerprint detection method and circuit thereof |
| CN112580597A (en) * | 2020-12-29 | 2021-03-30 | 深圳贝特莱电子科技股份有限公司 | Device and method for automatically adjusting fingerprint image brightness |
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