CN117037226A - Optical fingerprint module and fingerprint identification display device - Google Patents
Optical fingerprint module and fingerprint identification display device Download PDFInfo
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- CN117037226A CN117037226A CN202311298978.6A CN202311298978A CN117037226A CN 117037226 A CN117037226 A CN 117037226A CN 202311298978 A CN202311298978 A CN 202311298978A CN 117037226 A CN117037226 A CN 117037226A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/26—Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/34—Smoothing or thinning of the pattern; Morphological operations; Skeletonisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
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Abstract
The application discloses an optical fingerprint module and a fingerprint identification display device, which belong to the field of biological feature identification, wherein the optical fingerprint module comprises: the fingerprint acquisition unit is used for acquiring the fingerprint of the user; the storage unit is used for storing the known fingerprints and storing the additional conditions of each known fingerprint; the additional condition is the grade information of the fingerprint user, and the grade information is endowed by the authority of an administrator; the digital signal processing unit is used for converting the acquired fingerprint image into a digital signal; the identification unit is used for reading the fingerprint image acquired by the fingerprint acquisition unit, extracting characteristics, storing data and comparing; when the fingerprint is acquired, the fingerprint is acquired by adopting fingerprint enhancement and feature extraction, the fingerprint image can be well segmented through the step of fingerprint enhancement, and the minutiae points can be extracted to obtain multiple groups of ridge end points or bifurcation types, position coordinates and direction information.
Description
Technical Field
The application belongs to the field of biological feature recognition, and particularly relates to an optical fingerprint module. Meanwhile, the application also relates to a fingerprint identification display device. G06K
Background
The traditional optical fingerprint identification system basically utilizes the principle of total reflection of light, light rays emitted by a light source irradiate the appearance of a light-transmitting layer pressed with fingerprints, reflected light rays are obtained by an image sensor, the quantity of the reflected light rays depends on the depths of fingerprint ridges and valleys pressed on the appearance of glass, grease and moisture between skin and glass, the light rays are totally reflected at an interface between the glass and air after being emitted to the center of the valley through the glass, and the light rays are reflected to the image sensor, but the light rays emitted to the ridges are not totally reflected, but are absorbed by the contact surface of the ridges and the glass or diffusely reflected to other centers to form fingerprint collection;
however, the acquired fingerprint image is not processed in the identification process, and deviation can be generated in the identification process directly, so that an optical fingerprint module and a fingerprint identification display device are provided.
Disclosure of Invention
The application aims to solve the defects in the prior art, and provides an optical fingerprint module and a fingerprint identification display device, wherein when a fingerprint is acquired, the fingerprint is acquired by adopting fingerprint enhancement and feature extraction, a fingerprint image can be better segmented through the step of fingerprint enhancement, and a plurality of groups of ridge end points or bifurcation types, position coordinates and direction information can be obtained by extracting minutiae.
In order to achieve the above purpose, the present application provides the following technical solutions:
an optical fingerprint module, comprising:
the fingerprint acquisition unit is used for acquiring the fingerprint of the user;
the storage unit is used for storing the known fingerprints and storing the additional conditions of each known fingerprint; the additional condition is the grade information of the fingerprint user, and the grade information is endowed by the authority of an administrator;
the digital signal processing unit is used for converting the acquired fingerprint image into a digital signal;
the fingerprint identification unit is used for reading the fingerprint image acquired by the fingerprint acquisition unit, extracting the characteristics, storing the data and comparing, matching the input fingerprint with the real-time fingerprint information, wherein the fingerprint identification matching minutiae adopts a point pattern matching mode, namely, the extracted minutiae set is matched with the minutiae set in the database, if the minutiae set is matched with the input fingerprint through some rotation, scale transformation and translation transformation, the real-time fingerprint is matched with the input fingerprint, and the fingerprint is authenticated.
Preferably, the identification unit adopts fingerprint enhancement and feature extraction to realize fingerprint acquisition;
the fingerprint enhancement: the fingerprint image quality is improved by the image enhancement technology in the stage, because in the fingerprint acquisition process, some noise is inevitably introduced into the acquired fingerprint image due to various reasons, and the acquisition can be realized by enhancing the fingerprint image and removing the noise;
the feature extraction: the step of extracting the recorded fingerprint features, wherein the minutiae features are the most common fingerprint features, namely two features of a ridge line end point and a ridge line bifurcation in the fingerprint image, the fingerprint image can be better segmented through the step of fingerprint enhancement, and a plurality of groups of ridge end points or bifurcation types, position coordinates and direction information can be obtained by extracting minutiae points;
preferably, the fingerprint acquisition unit adopts an optical acquisition mode; when external light irradiates on the glass surface printed with the fingerprint, reflection and projection can be carried out on the capacitive coupler to form a fingerprint image, scattering can be carried out at the place with ridge lines, total reflection can be carried out at the place with valley lines, and different light rays are projected on the image controller to form the fingerprint image which can be processed.
Preferably, the process of converting the image continuous signal into the discrete digital signal by the digital signal processing unit is specifically:
the image sampling adopts discretization of the image in a two-dimensional space, namely, the brightness value of part of points is selected to represent the image, the selected points are called sampling points or sampling points, namely, pixel points, when the image is subjected to spatial sampling, uniform sampling is usually adopted to divide the image at equal intervals, and then the value of three primary colors of R, G, B is used as a two-dimensional vector function of components, wherein the two-dimensional vector function comprises the following formula:
；
image quantization, wherein the image is discretized into pixels in time and space after sampling, and the conversion from analog quantity to discrete quantity of the sampled pixels is called as the quantization of image signals;
and (3) image coding, namely compressing and storing the sampled data according to different storage formats.
Preferably, the process of converting an image continuous signal into a discrete digital signal further comprises a digital image representation, the digital image representation being represented by f (x, y), the digital image array having M rows and N columns, wherein (x, y) are both discrete coordinates, wherein x=0, 1,2,..m-1 and y=0, 1,2,..n-1, origin is f (0, 0);
preferably, the image quantization includes: dividing a picture to obtain an image macro block included in the picture;
carrying out prediction processing on the image macro block to obtain residual data of each pixel point included in the image macro block;
calculating the quantization step length of the image macro block according to the residual data of each pixel point included in the image macro block;
and carrying out quantization processing on the image macro block according to the quantization step length and residual data of each pixel point included in the image macro block, wherein the quantization processing comprises the following specific steps: and obtaining a prediction mode corresponding to the quantization step length, and carrying out quantization processing on the image macro block according to the quantization step length and residual data of each pixel point included in the image macro block in the obtained prediction mode.
The device comprises the optical fingerprint module and the display unit, wherein the display unit is interacted with the optical fingerprint module to display the fingerprint image acquired by the optical fingerprint module in real time, and the optical fingerprint module and the display unit adopt an extensible electric connection assembly to realize electric interaction of the optical fingerprint module and the display unit.
Preferably, the extendable electrical connection assembly comprises:
the male connecting plug and the female connecting plug are respectively provided with a hollow sleeve at one end, a magnetic hollow plug block is arranged at the end part of the hollow sleeve of the male connecting plug, and the magnetic hollow plug block is inserted into the hollow sleeve of the female connecting plug and fixed through magnetic adsorption;
the male connecting plug and the female connecting plug are connected by adopting a connecting wire, hollow sleeves arranged on the male connecting plug and the female connecting plug are combined to form a storage tube, and the connecting wire is positioned inside the storage tube.
Preferably, the optical fingerprint module and the display unit are both provided with connecting ends, the connecting ends are provided with internal thread sleeves for being fixedly connected with the male connecting plug and the female connecting plug, and the end parts of the male connecting plug and the female connecting plug are provided with external thread lantern rings matched with the internal thread sleeves.
The application has the technical effects and advantages that: compared with the prior art, the optical fingerprint module and the fingerprint identification display device provided by the application realize fingerprint acquisition by adopting fingerprint enhancement and feature extraction when acquiring fingerprints, and the fingerprint image can be better segmented through the step of fingerprint enhancement, and a plurality of groups of ridge end points or bifurcation types, position coordinates and direction information can be obtained by extracting minutiae;
secondly, in the process of converting the continuous image signals into discrete digital signals by the digital signal processing unit, the image quantization processing is adopted to improve the gray level resolution of the image, so that the subsequent contrast identification and display are facilitated;
in addition, the design of the prolonged electrical connection assembly can ensure that the optical fingerprint module and the display unit can realize interaction on one hand, and can avoid the limitation of connection of the optical fingerprint module and the display unit on the other hand, and the optical fingerprint module and the display unit can be separately installed and used according to the use environment and the use requirement through detachable electrical connection;
furthermore, but the extension type electric connection subassembly is fixed through magnetic adsorption, compares in the current well-known connected mode, and the structure is simpler, and the in-service use effect is better, and the convenience is higher simultaneously.
Finally, the identification display device displays the image information of the collected fingerprints in real time through interaction with the optical fingerprint module, so that a person to be collected can intuitively see the collected fingerprints.
Drawings
FIG. 1 is a system architecture diagram of an optical fingerprint module of the present application;
FIG. 2 is a system architecture diagram of a recognition display device according to an embodiment of the present application;
fig. 3 is a schematic diagram of the structure of the identification display device and the optical fingerprint module according to the present application:
FIG. 4 is a schematic diagram of a combination structure of the extendable electrical connection assembly of the present application;
fig. 5 is a schematic diagram of an internal structure of the extendable electrical connection assembly of the present application.
In the figure: 1. an optical fingerprint module; 2. a display unit; 3. an extendable electrical connection assembly; 4. a male connection plug; 5. a female connection plug; 6. a hollow sleeve; 7. a magnetic hollow plug block; 8. a connecting wire; 9. a storage tube; 10. a connection end; 11. an externally threaded collar.
Detailed Description
The present application will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides an identification display device, when collecting fingerprint, the fingerprint is collected by adopting fingerprint enhancement and feature extraction, the fingerprint image can be better segmented through the step of fingerprint enhancement, and the minutiae can be extracted to obtain a plurality of groups of ridge terminal points or bifurcation types, position coordinates and direction information, as shown in figure 1, comprising:
the fingerprint acquisition unit is used for acquiring the fingerprint of the user; the fingerprint acquisition unit adopts an optical acquisition mode; when external light irradiates on the glass surface printed with the fingerprint, reflection and projection can be carried out on the capacitive coupler to form a fingerprint image, scattering can be carried out at the place with ridge lines, total reflection can be carried out at the place with valley lines, and different light rays are projected on the image controller to form the fingerprint image which can be processed.
The storage unit is used for storing the known fingerprints and storing the additional conditions of each known fingerprint; the additional condition is the grade information of the fingerprint user, which is given by the authority of the administrator;
the digital signal processing unit is used for converting the acquired fingerprint image into a digital signal; the process of converting the image continuous signal into the discrete digital signal by the digital signal processing unit is specifically as follows:
the image sampling adopts discretization of the image in a two-dimensional space, namely, the brightness value of part of points is selected to represent the image, the selected points are called sampling points or sampling points, namely, pixel points, when the image is subjected to spatial sampling, uniform sampling is usually adopted to divide the image at equal intervals, and then the value of three primary colors of R, G, B is used as a two-dimensional vector function of components, wherein the two-dimensional vector function comprises the following formula:
；
image quantization, wherein the image is discretized into pixels in time and space after sampling, and the conversion from analog quantity to discrete quantity of the sampled pixels is called as the quantization of image signals;
further, quantization is classified into an equal quantization and a unequal quantization. Equal quantization is also called uniform quantization, which is to quantize the equally-spaced partitions of pixels; unequal quantization is to determine quantization intervals in terms of probability density, with the interval being smaller with greater density.
When the number of sampling points of the image is fixed, the image quality of different quantization levels is different. The more the quantization level is, the more the obtained image has more layers, the higher the gray resolution, the better the image quality, but the larger the data volume is; when the quantization level is reduced, the obtained image has less abundant levels and low gray resolution, false contour phenomenon can occur, and the image quality is poor.
And (3) image coding, namely compressing and storing the sampled data according to different storage formats.
The process of converting an image continuous signal into a discrete digital signal further includes a digital image representation, the digital image representation being represented by f (x, y), the digital image array having M rows and N columns, wherein (x, y) are discrete coordinates, wherein x=0, 1,2,..m-1 and y=0, 1,2,..n-1. Origin is f (0, 0);
further comprises: after the successive images f (x, y) are sampled, the coordinates (x, y) become discrete quantities (i, j); the digital image can be represented by a matrix of g (i, j) with each pixel in the digital image corresponding to a corresponding element in the matrix. An mxn digital image may be represented by the following matrix:
further, dividing the picture to obtain an image macro block included in the picture;
carrying out prediction processing on the image macro block to obtain residual data of each pixel point included in the image macro block;
the image macro block prediction processing specifically includes:
calculating the predicted pixel value of the current image macro block in each prediction mode according to the original pixels of the block which is adjacent to the current image macro block and only completes the calculation of the prediction direction and the reconstruction pixels of the block which completes the reconstruction stage; the method comprises the steps of calculating the predicted pixel value of a current image macro block in each prediction mode according to the original pixels of a block which is adjacent to the current image macro block and only completes the calculation of the prediction direction and the reconstruction pixels of the block which completes the reconstruction stage, wherein the predicted pixel value of the current image macro block in each prediction mode is specifically: calculating the predicted pixel value of each pixel point in the current image macro block in each prediction mode according to the original pixel of the corresponding pixel point in the left adjacent block, or the reconstructed pixel of the corresponding pixel point in the upper adjacent block, or the original pixel of the corresponding pixel point in the left adjacent block and the reconstructed pixel of the corresponding pixel point in the upper adjacent block;
further, the calculating of the predicted pixel value of the current image macro block in each prediction mode specifically includes: and for different prediction types, respectively calculating the prediction pixel value of the current image macro block in each corresponding prediction mode.
And calculating the prediction error of each prediction mode according to the actually measured pixel value of the current image macro block to obtain the optimal prediction mode.
It should be noted that: for the prediction type of the 16x16 brightness block, in the horizontal prediction mode, calculating according to the original pixel value of the corresponding pixel point in the left adjacent block, wherein the corresponding pixel point in the left adjacent block is each pixel point in the adjacent columns of the left adjacent block and the macro block of the current image;
in the vertical prediction mode, calculating according to the reconstructed pixel value of the corresponding pixel point in the upper adjacent block, wherein the corresponding pixel point in the upper adjacent block is each pixel point in the adjacent line of the upper adjacent block and the current image macro block;
and in the DC prediction mode and the plane prediction mode, calculating according to the original pixel value of the corresponding pixel point in the left adjacent block and the reconstructed pixel value of the corresponding pixel point in the upper adjacent block, wherein the corresponding pixel point in the left adjacent block is each pixel point in the adjacent columns of the left adjacent block and the current image macro block, and the corresponding pixel point in the upper adjacent block is each pixel point in the adjacent rows of the upper adjacent block and the current image macro block.
Calculating the quantization step length of the image macro block according to the residual data of each pixel point included in the image macro block;
according to the quantization step length and residual data of each pixel point included in the image macro block, the image macro block is quantized, specifically: and obtaining a prediction mode corresponding to the quantization step length, and carrying out quantization processing on the image macro block according to the quantization step length and residual data of each pixel point included in the image macro block in the obtained prediction mode.
The fingerprint identification unit is used for reading the fingerprint image acquired by the fingerprint acquisition unit, extracting the characteristics, storing the data and comparing, matching the input fingerprint with the real-time fingerprint information, wherein the fingerprint identification matching minutiae adopts a point pattern matching mode, namely, the extracted minutiae set is matched with the minutiae set in the database, if the minutiae set is matched with the input fingerprint through some rotation, scale transformation and translation transformation, the real-time fingerprint is matched with the input fingerprint, and the fingerprint is authenticated.
The identification unit adopts fingerprint enhancement and feature extraction to realize fingerprint acquisition;
fingerprint enhancement: the fingerprint image quality is improved by the image enhancement technology in the stage, because in the fingerprint acquisition process, some noise is inevitably introduced into the acquired fingerprint image due to various reasons, and the acquisition can be realized by enhancing the fingerprint image and removing the noise;
feature extraction: the step extracts the recorded fingerprint features, the minutiae features are the most common fingerprint features, namely two features of a ridge line end point and a ridge line bifurcation in the fingerprint image, the fingerprint image can be better segmented through the step of fingerprint enhancement, and a plurality of groups of ridge end points or bifurcation types, position coordinates and direction information can be obtained by extracting minutiae.
The embodiment further provides an identification display device, as shown in fig. 3-5, where the device includes the optical fingerprint module 1 and the display unit 2, the display unit 2 interacts with the optical fingerprint module 1 to display the fingerprint image collected by the optical fingerprint module in real time, and an extendable electrical connection component 3 is used between the optical fingerprint module 1 and the display unit 2 to realize electrical interaction between the optical fingerprint module 1 and the display unit 2.
Further, the extendable electrical connection assembly 3 includes:
the male connecting plug 4 and the female connecting plug 5 are respectively provided with a hollow sleeve 6 at one end of the male connecting plug 4 and one end of the female connecting plug 5, a magnetic hollow plug block 7 is arranged at the end part of the hollow sleeve of the male connecting plug 4, and the magnetic hollow plug block 7 is inserted into the hollow sleeve of the female connecting plug 5 and fixed through magnetic adsorption;
the male connecting plug 4 and the female connecting plug 5 are connected by adopting a connecting wire 8, hollow sleeves arranged on the male connecting plug 4 and the female connecting plug 5 are combined to form a storage tube 9, and the connecting wire 8 is positioned in the storage tube 9;
but all be provided with link 10 on optical fingerprint module and the display element, link 10 department is provided with be used for with male connection plug 4 and female connection plug 5 are connected fixed internal thread sleeve, male connection plug 4 and female connection plug 5's tip be provided with the external screw thread lantern ring 11 of internal thread sleeve 10 looks adaptation.
The design of the extendable electrical connection assembly can ensure that the optical fingerprint module 1 and the display unit 2 can realize interaction on one hand, and can avoid the limitation of connection between the optical fingerprint module 1 and the display unit 2 on the other hand, and the optical fingerprint module 1 and the display unit 2 can be separately installed and used according to the use environment and the use requirement through detachable electrical connection;
furthermore, the extendable electrical connection assembly 3 is fixed by magnetic adsorption, and compared with the prior known connection mode, the extendable electrical connection assembly has simpler structure, better actual use effect and higher convenience.
The display unit comprises a display screen, a fingerprint image signal input device arranged in the display screen and an image signal processing module arranged in the display screen, wherein the image signal processing module is electrically connected to the fingerprint image signal input device and the image signal processing module, and the fingerprint image signal input device is used for receiving a fingerprint image signal output by the optical fingerprint module, processing the fingerprint image signal by the image signal processing module and transmitting the processed fingerprint image signal to the display screen for display;
further, the image signal processing module includes: a synchronization signal control section configured to control a length of a synchronization signal of a predetermined row in one frame, the synchronization signal being a basis of a charge reading process of reading a charge from the pixel array on a row basis; and a timing adjustment section configured to adjust timing of an electronic shutter operation of the unit pixel in accordance with a length of the synchronization signal of the predetermined line controlled by the synchronization signal control section;
a shutter control section configured to control the electronic shutter operation to be performed at the timing adjusted by the timing adjustment section based on a synchronization signal reflecting the control of the synchronization signal control section; and a read control section configured to control a charge read operation of the unit pixel based on a synchronization signal reflecting the control of the synchronization signal control section.
As an alternative to this embodiment, the display unit may further employ the following manner:
the method specifically comprises the following steps:
a light source section including a plurality of light emitting sub-sections that are controlled independently of each other;
a liquid crystal display panel modulating light emitted from each light emitting sub-section of the light source section based on an input picture signal to display pictures by performing time-division switching of a plurality of picture streams in order from one to another;
and a display control section including a division driving processing section that generates a light emission pattern signal indicating a light emission pattern of each light emitting sub-section of the light source section and a division driving picture signal based on the input picture signal, the display control section performing light emission driving on each light emitting sub-section of the light source section using the light emission pattern signal, and performing display driving on the liquid crystal display panel using the division driving picture signal;
wherein the division drive processing section determines a logic or picture based on the input picture signal and generates the light emission pattern signal and the division drive picture signal using the logic or picture, wherein the logic or picture is a logic of pictures respectively belonging to the plurality of picture streams.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present application, and although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present application.
Claims (9)
1. An optical fingerprint module, comprising:
the fingerprint acquisition unit is used for acquiring the fingerprint of the user;
the storage unit is used for storing the known fingerprints and storing the additional conditions of each known fingerprint; the additional condition is the grade information of the fingerprint user, and the grade information is endowed by the authority of an administrator;
the digital signal processing unit is used for converting the acquired fingerprint image into a digital signal;
the fingerprint identification unit is used for reading the fingerprint image acquired by the fingerprint acquisition unit, extracting the characteristics, storing the data and comparing, matching the input fingerprint with the real-time fingerprint information, wherein the fingerprint identification matching minutiae adopts a point pattern matching mode, namely, the extracted minutiae set is matched with the minutiae set in the database, if the minutiae set is matched with the input fingerprint through some rotation, scale transformation and translation transformation, the real-time fingerprint is matched with the input fingerprint, and the fingerprint is authenticated.
2. An optical fingerprint module according to claim 1, wherein: the identification unit adopts fingerprint enhancement and feature extraction to realize fingerprint acquisition;
the fingerprint enhancement: the fingerprint image quality is improved by the image enhancement technology in the stage, because in the fingerprint acquisition process, some noise is inevitably introduced into the acquired fingerprint image due to various reasons, and the acquisition can be realized by enhancing the fingerprint image and removing the noise;
the feature extraction: the step extracts the recorded fingerprint features, the minutiae features are the most common fingerprint features, namely two features of a ridge line end point and a ridge line bifurcation in the fingerprint image, the fingerprint image can be better segmented through the step of fingerprint enhancement, and a plurality of groups of ridge end points or bifurcation types, position coordinates and direction information can be obtained by extracting minutiae.
3. An optical fingerprint module according to claim 1, wherein: the fingerprint acquisition unit adopts an optical acquisition mode; when external light irradiates on the glass surface printed with the fingerprint, reflection and projection can be carried out on the capacitive coupler to form a fingerprint image, scattering can be carried out at the place with ridge lines, total reflection can be carried out at the place with valley lines, and different light rays are projected on the image controller to form the fingerprint image which can be processed.
4. An optical fingerprint module according to claim 1, wherein: the process of converting the image continuous signal into the discrete digital signal by the digital signal processing unit is specifically as follows:
the image sampling adopts discretization of the image in a two-dimensional space, namely, the brightness value of part of points is selected to represent the image, the selected points are called sampling points or sampling points, namely, pixel points, when the image is subjected to spatial sampling, uniform sampling is usually adopted to divide the image at equal intervals, and then the value of three primary colors of R, G, B is used as a two-dimensional vector function of components, wherein the two-dimensional vector function comprises the following formula:
；
image quantization, wherein the image is discretized into pixels in time and space after sampling, and the conversion from analog quantity to discrete quantity of the sampled pixels is called as the quantization of image signals;
and (3) image coding, namely compressing and storing the sampled data according to different storage formats.
5. The optical fingerprint module of claim 4, wherein: the process of converting an image continuous signal into a discrete digital signal further includes a digital image representation, the digital image representation being represented by f (x, y), the digital image array having M rows and N columns, wherein (x, y) are both discrete coordinates, wherein x=0, 1, 2.
6. The optical fingerprint module of claim 4, wherein: the image quantization includes: dividing a picture to obtain an image macro block included in the picture;
carrying out prediction processing on the image macro block to obtain residual data of each pixel point included in the image macro block;
calculating the quantization step length of the image macro block according to the residual data of each pixel point included in the image macro block;
and carrying out quantization processing on the image macro block according to the quantization step length and residual data of each pixel point included in the image macro block, wherein the quantization processing comprises the following specific steps: and obtaining a prediction mode corresponding to the quantization step length, and carrying out quantization processing on the image macro block according to the quantization step length and residual data of each pixel point included in the image macro block in the obtained prediction mode.
7. An identification display device, which is characterized by comprising the optical fingerprint module and a display unit according to any one of claims 1-6, wherein the display unit interacts with the optical fingerprint module to display a fingerprint image acquired by the optical fingerprint module in real time, and an extensible electrical connection component is adopted between the optical fingerprint module and the display unit to realize electrical interaction between the optical fingerprint module and the display unit.
8. The identification display device of claim 7, wherein: the extendable electrical connection assembly comprises:
the male connecting plug and the female connecting plug are respectively provided with a hollow sleeve at one end, a magnetic hollow plug block is arranged at the end part of the hollow sleeve of the male connecting plug, and the magnetic hollow plug block is inserted into the hollow sleeve of the female connecting plug and fixed through magnetic adsorption;
the male connecting plug and the female connecting plug are connected by adopting a connecting wire, hollow sleeves arranged on the male connecting plug and the female connecting plug are combined to form a storage tube, and the connecting wire is positioned inside the storage tube.
9. The identification display device of claim 7, wherein: but all be provided with the link on optical fingerprint module and the display element, link department is provided with be used for with male connecting plug and female connecting plug are connected fixed internal thread sleeve, male connecting plug and female connecting plug's tip be provided with the external screw thread lantern ring of internal thread sleeve looks adaptation.
Priority Applications (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1818927A (en) * | 2006-03-23 | 2006-08-16 | 北京中控科技发展有限公司 | Fingerprint identifying method and system |
| CN101777128A (en) * | 2009-11-25 | 2010-07-14 | 中国科学院自动化研究所 | Fingerprint minutiae matching method syncretized to global information and system thereof |
| CN105992001A (en) * | 2015-03-02 | 2016-10-05 | 深圳市腾讯计算机系统有限公司 | Method and device for carrying out quantification processing on picture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818927A (en) * | 2006-03-23 | 2006-08-16 | 北京中控科技发展有限公司 | Fingerprint identifying method and system |
| WO2007107050A1 (en) * | 2006-03-23 | 2007-09-27 | Zksoftware Beijing Inc. | Fingerprint identification method and system |
| CN101777128A (en) * | 2009-11-25 | 2010-07-14 | 中国科学院自动化研究所 | Fingerprint minutiae matching method syncretized to global information and system thereof |
| CN105992001A (en) * | 2015-03-02 | 2016-10-05 | 深圳市腾讯计算机系统有限公司 | Method and device for carrying out quantification processing on picture |
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