CN106796659B - Method for making artificial fingerprint - Google Patents
Method for making artificial fingerprint Download PDFInfo
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- CN106796659B CN106796659B CN201680001507.6A CN201680001507A CN106796659B CN 106796659 B CN106796659 B CN 106796659B CN 201680001507 A CN201680001507 A CN 201680001507A CN 106796659 B CN106796659 B CN 106796659B
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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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
- G06V40/1382—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
Abstract
The invention provides a method for manufacturing an artificial fingerprint, which comprises the following steps: carrying out fingerprint ridge and valley feature sharpening on a fingerprint image collected in advance, and manufacturing a fingerprint mold according to the fingerprint image subjected to sharpening so as to enable fingerprint ridge and valley features to be formed on the fingerprint mold; and adopting a solid conductive material or a liquid conductive material and manufacturing and generating the simulated fingerprint based on the fingerprint mold with the fingerprint ridge and valley characteristics. The simulated fingerprint ridge-valley characteristics manufactured by the manufacturing method of the simulated fingerprint provided by the embodiment of the invention are obvious, the identification rate of the simulated fingerprint is improved, when the capacitive fingerprint sensor is evaluated by using the simulated fingerprint, the identification rate meets the requirement, the accuracy of the evaluated false rejection rate and false acceptance rate is higher, the performance of the capacitive fingerprint sensor is favorably improved, and the yield of products can be ensured when batch testing is carried out.
Description
Technical Field
The embodiment of the invention relates to the field of fingerprint identification, in particular to a manufacturing method of an artificial fingerprint.
Background
Due to the characteristics of uniqueness and stability of the fingerprint, identity recognition can be realized. The fingerprint sensor is a key device for realizing automatic fingerprint acquisition, wherein the capacitive fingerprint sensor is widely applied to an intelligent terminal.
The principle of the capacitive fingerprint sensor is that a 'flat plate' integrated with thousands of semiconductor devices is provided, fingers are attached to the 'flat plate' to form the other surface of a capacitor, the finger plane is uneven, and the convex points and the concave points respectively correspond to fingerprint ridge features and fingerprint valley features, so that the actual distances contacting the flat plate are different, the formed capacitance values are different, the collected different values are summarized according to the principle, and the fingerprint collection is completed.
The false rejection rate and the false acceptance rate are important indexes for evaluating the fingerprint sensor, but the capacitive fingerprint sensor belongs to a semiconductor fingerprint sensor, the manufacturing process is complex, the number of sensing units is large on a unit area, and the capacitive fingerprint sensor relates to an IC design technology, a large-scale integrated circuit manufacturing technology, an IC chip packaging technology and the like, so that the false rejection rate and the false acceptance rate are easily not met, and the quality of the capacitive fingerprint sensor is difficult to guarantee.
Therefore, the industry generally adopts simulated fingerprints to evaluate the indicators of the capacitive fingerprint sensor, such as the false rejection rate and the false acceptance rate.
However, the quality of the image for manufacturing the simulated fingerprint is poor at present, so that the recognition rate of the manufactured simulated fingerprint is low when the capacitive fingerprint sensor is evaluated, the recognition rate cannot meet the requirement when the capacitive fingerprint sensor is evaluated by using the conventional simulated fingerprint, and further the deviation between the reject rate and the authentication rate is caused, so that the product performance of the capacitive fingerprint sensor cannot be correctly evaluated by using the conventional simulated fingerprint, the improvement of the product performance of the capacitive fingerprint sensor is hindered, and the yield of the product cannot be ensured when the conventional simulated fingerprint is used for batch testing of the capacitive fingerprint sensor.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method for making an artificial fingerprint, which is used to overcome the above technical defects in the prior art.
The technical scheme adopted by the embodiment of the invention is as follows:
the embodiment of the invention provides a method for manufacturing an artificial fingerprint, which comprises the following steps:
carrying out fingerprint ridge and valley feature sharpening on a fingerprint image collected in advance, and manufacturing a fingerprint mold according to the fingerprint image subjected to sharpening so as to enable the fingerprint ridge and valley feature to be formed on the fingerprint mold;
and adopting a solid conductive material or a liquid conductive material and manufacturing and generating the simulated fingerprint based on the fingerprint mold with the fingerprint ridge and valley characteristics.
Optionally, in any embodiment of the present invention, the generating the artificial fingerprint includes:
and pressing the solid conductive material poured onto the fingerprint mold to enable the pressed solid conductive material to have a set thickness, and enabling the fingerprint ridge and valley characteristics on the fingerprint mold to be imprinted on the pressed solid conductive material to generate the simulated fingerprint.
Optionally, in any embodiment of the present invention, performing fingerprint ridge and valley feature sharpening on a pre-acquired fingerprint image includes: and carrying out binarization processing on the pre-acquired fingerprint image according to a set threshold value so as to clarify fingerprint ridge and valley characteristics.
Optionally, in any embodiment of the present invention, the method further includes: classifying the pre-acquired fingerprint images according to different acquisition states, and setting different thresholds for different types of the pre-acquired fingerprint images;
the binarization of the pre-collected fingerprint image according to a set threshold value to make the fingerprint ridge and valley characteristics clear comprises the following steps: and carrying out binarization processing on the pre-acquired fingerprint image of the type according to a threshold value set for the pre-acquired fingerprint image of the type, so that the fingerprint ridge and valley characteristics are clear.
Optionally, in any embodiment of the present invention, after performing fingerprint ridge and valley feature sharpening on a pre-acquired fingerprint image, an obtained width ratio between a valley feature and a ridge feature of the fingerprint image after sharpening is consistent with a width ratio between a valley feature and a ridge feature corresponding to a real finger.
Optionally, in any embodiment of the present invention, the manufacturing a fingerprint mold according to the fingerprint image after the sharpening process, and the forming the fingerprint ridge and valley features on the fingerprint mold includes: and converting the fingerprint image after the sharpening treatment into a fingerprint image which can be identified by printed circuit board production control software, outputting a circuit board description file, and manufacturing a printed circuit board fingerprint mold according to the circuit board description file.
Optionally, in any embodiment of the present invention, the manufacturing a fingerprint mold according to the fingerprint image after the sharpening process, and the forming the fingerprint ridge and valley features on the fingerprint mold includes:
printing the fingerprint image after the sharpening treatment on a film, and pasting the film printed with the fingerprint image after the sharpening treatment on a printed circuit board comprising a photosensitive film;
and processing the printed circuit board with the film with the fingerprint image to form a printed circuit board fingerprint mold.
Optionally, in any embodiment of the present invention, the pressing the solid conductive material poured onto the fingerprint mold includes: and pressing the solid conductive material poured onto the fingerprint mold for a set time, and printing the fingerprint ridge and valley characteristics on the fingerprint mold on the pressed solid conductive material to generate a simulated fingerprint, wherein the set time is determined according to the solid conductive material subjected to pressing.
Optionally, in any embodiment of the present invention, the method further includes: and carrying out molding treatment on the solid conductive material to enable the depth difference of the ridge-valley features on the pressed solid conductive material to be 0.010-0.1 mm.
Optionally, in any embodiment of the present invention, the molding the solid conductive material includes: and adding a curing agent capable of forming the solid conductive material, wherein the softness of the solid conductive material after the curing agent is added is 10-50 HA.
Optionally, in any embodiment of the present invention, the volume of the curing agent added is greater than one twentieth of the volume of the solid conductive material.
Optionally, in any embodiment of the present invention, before the placing the solid conductive material into the fingerprint mold, the method further includes: and coating a layer of isolating material on the fingerprint mold to prevent the solid conductive material from being bonded with the fingerprint mold.
Optionally, in any embodiment of the present invention, the simulated fingerprint meets at least one or more of the following parameter requirements:
the thickness of the simulated fingerprint is 0.010mm-1.5 mm;
the softness of the simulated fingerprint is lower than 50 HA;
the resistance value of the simulated fingerprint is 0-50M omega.
Optionally, in any embodiment of the present invention, the generating the artificial fingerprint includes:
and coating a liquid conductive material on the fingerprint mold, and imprinting the fingerprint ridge and valley characteristics on the fingerprint mold onto a film layer formed by the liquid conductive material to generate the simulated fingerprint.
The embodiment of the invention provides a method for manufacturing an artificial fingerprint, which comprises the following steps:
carrying out fingerprint ridge and valley feature sharpening on a fingerprint image acquired in advance;
and printing conductive ink on a material by taking the fingerprint image subjected to the sharpening treatment as a template, so that the fingerprint ridge and valley characteristics are formed on the material to generate the simulated fingerprint.
Optionally, in any embodiment of the invention, the material has a pre-set softness.
Optionally, in any embodiment of the present invention, when the ridge features included in the printed simulated fingerprint are a plurality of electrical conductors, an electrically conductive line is added to the simulated fingerprint, so that all the ridge features of the simulated fingerprint are electrically connected to form one electrical conductor.
Optionally, in any embodiment of the present invention, before printing the conductive ink on the material by using the fingerprint image after the sharpening process as a template, the method further includes: and carrying out mirror image processing on the fingerprint image.
In the embodiment of the invention, fingerprint ridge and valley characteristics of the fingerprint image collected in advance are subjected to sharpening treatment, and the simulated fingerprint is manufactured according to the fingerprint image subjected to sharpening treatment, so that the manufactured simulated fingerprint has obvious fingerprint ridge and valley characteristics, the identification rate of the simulated fingerprint is improved, when the simulated fingerprint is used for evaluating the capacitive fingerprint sensor, the identification rate meets the requirement, the accuracy of the evaluated rejection rate and the evaluation rate is higher, the performance of the capacitive fingerprint sensor is further improved, and the yield of products can be ensured when batch tests are carried out.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for making an artificial fingerprint according to the embodiment of the present invention;
FIG. 2(a) is a schematic diagram of a fingerprint image collected according to an embodiment of the present invention;
FIG. 2(b) is a fingerprint image obtained after binarization processing according to the embodiment of the invention;
fig. 3 is a schematic flowchart of an embodiment of a method for obtaining a printed circuit board fingerprint mold through a printed circuit board according to the embodiment of the invention;
fig. 4 is a schematic flowchart of a method for obtaining a fingerprint mold through a printed circuit board according to another embodiment of the present invention;
FIG. 5(a) is a picture saved after performing ridge-valley conversion according to an embodiment of the present invention;
FIG. 5(b) is a schematic diagram of a film printed according to an embodiment of the present invention;
FIG. 5(c) is a schematic view of a printed circuit board fingerprint mold according to an embodiment of the invention;
fig. 6 is a schematic flowchart of an embodiment of a method for manufacturing an artificial fingerprint by using a solid black conductive material according to the present invention;
FIG. 7 is a schematic flow chart illustrating a method for manufacturing an artificial fingerprint by using a liquid conductive material according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart illustrating a method for manufacturing an artificial fingerprint by using a liquid conductive material according to another embodiment of the present invention;
fig. 9 is a flowchart illustrating an embodiment of a method for producing an artificial fingerprint by printing according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present invention will be further described by the following embodiments.
Example one
The present embodiment provides a schematic flow chart of an embodiment of a method for making an artificial fingerprint, as shown in fig. 1, which includes:
and S11, carrying out fingerprint ridge and valley feature sharpening processing on the fingerprint image acquired in advance.
In this embodiment, the fingerprint image may be formed by pre-collecting fingerprints by the following method:
(1) dipping colored inkpad on a finger, pressing the finger on paper, and finally scanning the finger by a scanner to obtain a fingerprint image; alternatively, the first and second electrodes may be,
(2) collecting fingerprints through an optical sensor, and obtaining fingerprint images by sensing the brightness of light reflected back by the fingerprints; alternatively, the first and second electrodes may be,
(3) and displaying the finger fingerprint on the object by using graphite powder, and then acquiring an image to obtain a fingerprint image on the object.
In order to ensure that the similarity between the manufactured simulated fingerprint and the real fingerprint is higher, a fingerprint image with a large enough area is preferably acquired as far as possible in the fingerprint acquisition process, so that the acquired fingerprint image contains enough fingerprint features.
After the fingerprint image is collected, the definition of the fingerprint image may not be high enough, if the fingerprint image is directly processed and manufactured according to the original image, the quality of the obtained simulated fingerprint is low, and the fingerprint ridge and valley characteristics are not obvious. Therefore, the acquired fingerprint image needs to be processed clearly to improve the quality of the finished simulated fingerprint.
For this reason, in this embodiment, the fingerprint ridge and valley feature sharpening process performed on the fingerprint image in step S11 may specifically include: and carrying out binarization processing on the pre-acquired fingerprint image according to a set threshold value so as to clarify the fingerprint ridge and valley characteristics.
In this embodiment, in order to form clear fingerprint ridge and valley features on a fingerprint mold subsequently, the fingerprint image is subjected to binarization processing, and the gray value of the pixel point of the fingerprint image is set to be 0 or 255, so that the fingerprint image has an obvious black-and-white visual effect, wherein the black color represents ridges, and the white color represents valleys. In this embodiment, the sharpening process may be implemented by a global binarization technique.
Specifically, a global gray threshold T is set, and the gray value of the fingerprint image is divided into two parts, namely a pixel group larger than the gray threshold T and a pixel group smaller than the threshold T by using the gray threshold T. Comparing the gray value of the fingerprint image with a gray threshold T, setting the pixel group larger than the gray threshold T as a valley of the fingerprint image, uniformly setting the gray corresponding to the pixels as 255 again, and representing white; the pixel group smaller than the threshold value T is set as the ridge of the fingerprint image, and the gray values corresponding to all the pixels in the pixel group are set to 0 again to represent black. The black and white color makes the fingerprint ridge and valley characteristics of the fingerprint image more prominent, thereby obtaining the obvious and clear fingerprint image.
In this embodiment, before the global threshold binarization processing, the method may further include: classifying the fingerprint images acquired in advance according to different acquisition environments, and setting different threshold values for different types of fingerprint images acquired in advance;
in this embodiment, if the state of gathering is that the finger is in dry state, the finger is in moist state, or the finger is in normal condition, and the fingerprint ridge valley characteristic definition also can have the difference on the fingerprint image that forms under the different collection environment, and the finger is in dry state and forms dry finger fingerprint, is in moist state and forms wet finger fingerprint, is in normal condition and forms normal finger fingerprint. The fingerprint ridge and valley feature definition on the fingerprint image of the dry finger fingerprint collected in a dry state is low; the fingerprint ridge and valley feature definition of the fingerprint image of the collected wet finger fingerprint in a wet state is high; the definition of the fingerprint ridge and valley characteristics on the fingerprint image of the normal finger collected in the normal state is between the definition of the fingerprint ridge and valley characteristics on the dry finger fingerprint image and the wet finger fingerprint image.
The different definition of the different types of fingerprint ridge and valley features may also be different if represented by gray scale values. For this reason, different gray threshold values are set for different types of fingerprint images, for example, for a wet finger fingerprint image, the fingerprint ridge and valley features are clear, the gray value difference is large, and the set gray threshold values are high if the similar gray value distribution is concentrated; for the fingerprint ridge and valley characteristics of the dry finger fingerprint image are low, the gray value difference is small, and the distribution of the similar gray values is dispersed, the set gray threshold value is small, so that the fingerprint ridge and valley characteristics of the fingerprint image are processed more prominently; for a normal finger fingerprint image with fingerprint ridge and valley feature definition between the two types, the set gray threshold may also be between the two gray thresholds.
Further, at the time of the binarization processing, the method further includes: and carrying out binarization processing on the pre-acquired fingerprint image of the type according to a gray threshold set for the pre-acquired fingerprint image of the type to be subjected to binarization processing, so that the fingerprint ridge and valley characteristics are clear, further determining a corresponding gray threshold according to different types of fingerprint images, and then forming the fingerprint image after binarization by comparing the gray value with the threshold.
The fingerprint ridge and valley characteristics are clarified by setting the global threshold value T to carry out binarization processing on the fingerprint, however, the global threshold value of the fingerprint image is not necessarily suitable for the partial area of the fingerprint image, and the specific details of the partial area of the fingerprint image are not obvious in the processing process. Therefore, alternatively, in other embodiments, the fingerprint image may also be subjected to local binarization processing, the fingerprint image is divided into different regions according to the distribution positions of the fingerprint or the distribution of the fingerprint gray levels, and different gray level thresholds are set in the different regions, so as to complete the local binarization processing of the fingerprint image. Compared with global binarization processing, the fingerprint ridge and valley characteristics of the fingerprint image obtained after the fingerprint image is subjected to local binarization processing are more obvious in local details, and the fingerprint ridge and valley characteristics of the fingerprint image are clearer. In this embodiment, the width ratio of the valley features and the ridge features of the obtained fingerprint image after the sharpening process is consistent with the width ratio of the valley features and the ridge features corresponding to the real finger. Specifically, the width ratio of the valley features and the ridge features of the fingerprint image can be adjusted by adjusting the size of the threshold value in the binarization processing, so that the width ratio of the valley features and the ridge features of the fingerprint image is consistent with the width ratio of the valley features and the ridge features of the real finger.
Fig. 2(a) is a schematic diagram of a fingerprint image acquired according to an embodiment of the present invention, and fig. 2(b) is a schematic diagram of a fingerprint image obtained after binarization processing according to an embodiment of the present invention, as shown in fig. 2(a) and (b), the definitions of the fingerprint images before and after conversion are significantly different.
It should be noted that, in order to subsequently enable the manufactured simulated fingerprint to be identified by the fingerprint sensor, in this embodiment, the size of the fingerprint image obtained after the binarization processing of the fingerprint image is adjusted to an image with a ratio of 1:1 to the real fingerprint, so that the size of the obtained simulated fingerprint is consistent with that of the original fingerprint, and if the simulated fingerprint is used for the test of the fingerprint sensor, the simulated fingerprint can simulate the real fingerprint as much as possible, thereby improving the accuracy of the test of the fingerprint sensor.
In this embodiment, the fingerprint image preferably uses a BMP bitmap, so that it is greatly ensured that the fingerprint ridge and valley characteristics of the formed fingerprint image are the same as those of the fingerprint image after binarization, which can be specifically shown in fig. 5 (a).
And S12, manufacturing a fingerprint mold according to the fingerprint image after the sharpening treatment, and enabling fingerprint ridge and valley characteristics to be formed on the fingerprint mold.
In this embodiment, in order to make the fingerprint ridge and valley characteristics of the simulated fingerprint consistent with the fingerprint ridge and valley characteristics of the collected fingerprint, when the fingerprint image is manufactured according to the fingerprint image after the sharpening process, ridge and valley conversion is performed on the fingerprint image, so that the fingerprint valley characteristics of the original fingerprint image become the fingerprint ridge characteristics on the fingerprint mold, and the fingerprint ridge characteristics of the original fingerprint image become the fingerprint valley characteristics on the fingerprint mold, so that when the subsequent solid conductive material is poured into the fingerprint mold, the fingerprint ridge and valley characteristics on the solid conductive material are consistent with the real fingerprint.
The ridge-valley conversion can be completed when the fingerprint image required by the fingerprint mold is manufactured, and can also be completed when the fingerprint template is manufactured after the fingerprint image is manufactured.
Wherein, when making the required fingerprint image of fingerprint mould, accomplish the ridge valley conversion and specifically do: the fingerprint image obtained by the binarization processing of the fingerprint image in the above steps only has two gray levels, namely the gray levels are 0 and 255, and the color of the fingerprint image only comprises white or black. When ridge-valley conversion is performed on the fingerprint image, black-white conversion can be directly performed on the fingerprint image, namely, the gray value of the area with the gray value of 0 in the original fingerprint image is changed to 255, and the gray value of the area with the gray value of 255 is changed to 0, so that the fingerprint image after ridge-valley conversion can be obtained.
When fingerprint mould is made according to the fingerprint image after the fingerprint conversion, the material of fingerprint mould needs certain hardness to guarantee that enough thin lines are fixed to be formed on the material, consequently, select printed circuit board as the base plate in this embodiment, print the fingerprint ridge valley characteristic on the fingerprint image on printed circuit board, make it form enough clear and the enough thin fingerprint ridge valley characteristic of lines, thereby form printed circuit board fingerprint mould.
Alternatively, the fingerprint mold may be obtained by other methods, such as laser engraving, etc.
Compared with the fingerprint mold directly manufactured according to the fingerprint image, the fingerprint mold obtained according to the fingerprint image printed circuit board after the fingerprint image is subjected to the sharpening processing has the advantage that the ridge and valley characteristics of the fingerprint are more obvious.
And S13, manufacturing and generating the simulated fingerprint by adopting a solid conductive material and based on the fingerprint mold with the fingerprint ridge and valley characteristics.
Specifically, the solid conductive material poured onto the fingerprint mold is subjected to pressing treatment, so that the pressed solid conductive material has a set thickness, and fingerprint ridge and valley features on the fingerprint mold are imprinted on the pressed solid conductive material.
Because the fingerprint ridge and valley features are formed on the fingerprint mold, and the ridge and valley conversion is performed relative to the fingerprint ridge and valley features on the fingerprint image acquired in advance, when the solid conductive material is pressed on the fingerprint mold, the fingerprint ridge and valley features identical to the fingerprint of a real finger are printed on the solid conductive material.
Further, in the embodiment, before the solid conductive material is poured into the fingerprint mold, a curing agent capable of forming the solid conductive material may be further added, so that the solid conductive material is easily formed in the pressing process. Specifically, the curing agent can be added for multiple times, and the curing agent and the solid conductive material are kneaded for multiple times after the curing agent is added for each time, so that the curing agent and the solid conductive material are fully mixed, and the finally manufactured simulated fingerprint has good softness, thereby improving the quality of the simulated fingerprint.
The added curing agent is conductive electric solution, so that the conductivity of the solid conductive material is enhanced on one hand, and the solid conductive material is easy to form in the pressing process on the other hand.
In this embodiment, if the formed simulated fingerprint is used for testing the capacitive fingerprint sensor, it is preferable that the thickness of the solid conductive material after pressing is in the range of 0.010mm to 1.5mm, and the resistance value of the simulated fingerprint formed after pressing is between 0M Ω to 50M Ω, so that the simulated fingerprint is accurately identified by the capacitive fingerprint sensor during testing.
Compared with the existing simulated fingerprint, the simulated fingerprint generated after the fingerprint image is made according to the definition has higher similarity with the real fingerprint, so that the identification rate is higher when the simulated fingerprint generated according to the fingerprint image after the definition is identified by the capacitive fingerprint sensor.
Meanwhile, the simulated fingerprint is made of a solid conductive material, and when the capacitive fingerprint sensor is used for collecting, the capacitance can be sensed, so that the simulated fingerprint is accurately identified by the capacitive fingerprint sensor.
In the method for manufacturing the simulated fingerprint provided by the embodiment, fingerprint ridge and valley characteristics are subjected to sharpening on a fingerprint image acquired in advance, and a fingerprint mold is manufactured according to the fingerprint image subjected to sharpening, so that the fingerprint ridge and valley characteristics are formed on the fingerprint mold; the solid conductive material is adopted, the simulated fingerprint is manufactured and generated based on the fingerprint mold with the fingerprint ridge and valley characteristics, the identification rate of the simulated fingerprint is improved, when the capacitive fingerprint sensor is evaluated by using the simulated fingerprint, the identification rate meets the requirement, the accuracy of the rejection rate and the false recognition rate obtained by evaluation is higher, the performance of the capacitive fingerprint sensor is favorably improved, and the yield of products can be ensured during batch testing.
Example two
The invention provides a flow chart of an embodiment of a method for obtaining a fingerprint mold through a printed circuit board, as shown in fig. 3, the method comprises the following steps:
s21, converting the fingerprint image after the sharpening into a fingerprint image which can be identified by production control software of a printed circuit board factory and outputting a circuit board description file;
in this embodiment, the fingerprint image after the sharpening process may be a fingerprint image in which ridge-valley conversion is completed.
In this embodiment, for example, the image may be converted into a fingerprint image recognizable by printed circuit board production control software through Allegro tool of camentine (Cadence) electronic technology ltd.
In this embodiment, the fingerprint image may also be converted into a fingerprint image recognizable by the printed circuit board production control software through other manners, and a person skilled in the art may operate according to common general knowledge in the art, which will not be further described herein.
At present, the Gerber file is a standard format for image conversion in the circuit board industry, therefore, in this embodiment, a file recognizable by printed circuit board production control software is manufactured into the Gerber file, according to the content contained in the Gerber file, a printed circuit board manufacturer can print a complete printed circuit board with the same fingerprint ridge and valley characteristics as the fingerprint image after the sharpening process, and the fingerprint mold of the printed circuit board can be a plane body.
And S22, manufacturing a printed circuit fingerprint mold according to the circuit board description file.
And providing the obtained Gerber file to a manufacturer, and printing the fingerprint mold of the printed circuit board according to the Gerber file.
In the method for obtaining the board fingerprint mold through the printed circuit board, the fingerprint image subjected to ridge-valley conversion after being clarified is converted into the fingerprint image recognizable by the printed circuit board production control software, the fingerprint image is output to the printed circuit board description file and is printed by a printed circuit board manufacturer, and the obtained printed circuit board fingerprint mold has high ridge-valley feature precision.
EXAMPLE III
The present invention also provides a schematic flow chart of another embodiment of a method for obtaining a fingerprint mold by printing a printed circuit board, as shown in fig. 4, which includes:
s31, printing the fingerprint image after the sharpening process on a film;
transparent and semitransparent films can be used for subsequent photosensitive treatment. In this embodiment, a transparent film is taken as an example, after a fingerprint image subjected to the ridge-valley conversion by the sharpening process is printed on the film, the ridge-valley characteristics of the fingerprint are attached to the film, the ridge characteristics of the fingerprint are black, and the black part printed on the transparent film is opaque; the fingerprint valleys are characterized by white color and the white portion will be transparent after printing on the transparent film, as can be seen in fig. 5 (b).
S32, attaching the film printed with the fingerprint image after the sharpening process to a printed circuit board comprising a photosensitive film;
if the artificial fingerprints are made manually, the film can be directly pasted on the printed circuit board through manual operation in the step, and if the artificial fingerprints are made in large batch, the film can be pasted on the printed circuit board through professional equipment such as a mechanical arm, an automatic sucker and the like.
And S33, processing the printed circuit board with the film with the fingerprint image to form a printed circuit board fingerprint mold. The photosensitive circuit board has a positive photosensitive plate and a negative photosensitive plate, the embodiment takes the positive photosensitive plate as an example for illustration, and the fingerprint image adopted for printing the positive photosensitive plate is the fingerprint image after ridge-valley conversion.
Specifically, when the printed circuit board of the film with the fingerprint image is exposed, the fingerprint ridge features are black and white on the film, different black and white colors on the transparent film generate different light transmission effects, and the different light transmission effects enable the photosensitive film to be dissolved to generate the fingerprint ridge and valley features which are the same as the fingerprint ridge and valley features of the image on the transparent film. Light irradiates the photosensitive film through the film, the photosensitive film in the white area is dissolved after exposure, and the fingerprint valley characteristics are corresponded after corrosion treatment; the photosensitive film in the black area is not exposed to light and will not dissolve, and the etching process is performed to correspond to the fingerprint ridge feature, as shown in fig. 5 (c). The black lines in fig. 5(c) are ridge features and the white areas within the black lines are valley features.
The method for printing the printed circuit board by the sensitization method to obtain the fingerprint mold directly prints the fingerprint image obtained by the ridge-valley conversion after the clarification treatment on the film, and prints the printed circuit board by the sensitization method by taking the fingerprint image as a reference to obtain the fingerprint mold of the printed circuit board.
Example four
Since graphite has a good conductive property, a schematic process flow for manufacturing a simulated fingerprint by using a solid black conductive material formed by adding the graphite and a fingerprint mold of a printed circuit board is described below as an example.
The invention provides a flow diagram of an embodiment of a method for manufacturing an artificial fingerprint by using a solid black conductive material, as shown in fig. 6, the method comprises the following steps:
and S41, acquiring the fingerprint and carrying out sharpening treatment to generate the fingerprint mold.
This step is explained in detail in the above embodiments, and is not described herein again. The fingerprint molds obtained in the above embodiments can be used in this embodiment.
And S42, taking out a certain volume of solid black conductive material.
In this embodiment, the area of the simulated fingerprint and the required thickness of the simulated fingerprint may be estimated, so as to determine the volume of the simulated fingerprint. The volume of the solid conductive material taken out can be 1 time or more than that of the simulated fingerprint, so that the waste of the material is reduced on the basis of ensuring that the simulated fingerprint can be manufactured.
S43, adding a curing agent into the solid black conductive material, and enabling the softness of the solid conductive material after the curing agent is added to be 10-50HA, wherein the softness of the conductive material can be controlled by the volume of the added curing agent.
In this embodiment, the material for manufacturing the simulated fingerprint is a solid conductive material, so the curing agent is a liquid curing agent.
The total amount of the added liquid curing agent is related to the volume of the solid black conductive material, specifically, the volume of the added curing agent is larger than one twentieth of the volume of the solid black conductive material, the larger the volume of the solid black conductive material is, the larger the total amount of the liquid curing agent needs to be added, taking the solid black conductive material to manufacture a single simulated fingerprint as an example, the volume of the selected solid black conductive material is 0.24cm3When the curing agent is added, the volume of the curing agent is 0.1-0.25cm3Is most preferred.
In this embodiment, if the liquid curing agent is dropped into the solid black conductive material, the total amount of the curing agent added is 0.1 to 0.25cm3In this case, the curing agent may be added to the solid black conductive material in 2 to 5 times. Kneading the curing agent and the solid black conductive material after adding the curing agent each time to ensure that the curing agent and the solid conductive material are fully mixed, wherein the kneading frequency is 10-13 times after adding the curing agent each time, and the total extrusion frequency of the curing agent and the solid black conductive material is 20-45 times.
And S44, pouring the solid black conductive silica gel into a fingerprint mold for pressing, so that the fingerprint ridge and valley characteristics on the fingerprint mold are imprinted on the pressed solid black conductive material.
In this embodiment, before the solid black conductive material is poured into the fingerprint mold, a layer of isolation material is coated on the surface of the fingerprint mold to prevent the solid black conductive material from adhering to the fingerprint mold.
And S45, pressing for a certain time to completely dry the solid black conductive material.
The solid black conductive material added with the curing agent can be cured in a certain environment, and is cured while being pressed, and after the curing is finished, the fingerprint ridge-valley characteristics on the fingerprint mold can be printed on the film layer of the solid black conductive material, so that the fingerprint ridge-valley characteristics are the same as those of the acquired fingerprint image.
After the curing agent is added, the black conductive material is cured for a certain time under a certain condition, the curing condition and the curing time are determined according to the properties of different solid conductive adhesives and the volume of the added curing agent, and the black conductive material can be determined by a person skilled in the art according to the prior art.
In this embodiment, the solid black conductive material poured onto the fingerprint mold is subjected to pressing treatment and is kept for a set duration, the set duration is determined according to the volume of the solid black conductive material and the volume of the added curing agent, and the larger the volume of the added curing agent is, the smaller the set duration is.
In a volume of 0.24cm3For example, the volume of the liquid curing agent added is 0.1cm3The curing time is about 6 hours, and the volume of the added liquid curing agent is 0.15cm3The curing time is about 3 hours, and the volume of the added liquid curing agent is 0.25cm3The curing time was about 1 hour.
And S46, cutting off the bonded redundant solid black conductive material by using a tool, and then taking down the solid black conductive material printed with the fingerprint ridge and valley characteristics to obtain the simulated fingerprint.
And S47, cleaning the isolation material on the simulated fingerprint to improve the conductivity of the simulated fingerprint.
In the embodiment, the curing agent is added into the solid conductive material, and the solid conductive material subjected to pressing treatment is subjected to forming treatment, so that the depth difference of the ridge-valley features on the pressed solid conductive material is controlled within 0.010mm-0.1 mm.
The method of the molding treatment includes not only adding the curing agent to the solid conductive material, but also other molding methods, which can be determined by those skilled in the art and will not be illustrated herein.
The upper surface of the existing fingerprint sensor comprises a concave surface for guiding a finger, the simulated fingerprint generated by the method provided by the embodiment HAs preset softness, and when the fingerprint sensor is evaluated, the shape of the simulated fingerprint with the softness can be changed under the condition that the ridge and valley characteristics of the simulated fingerprint are not damaged, so that the simulated fingerprint is attached to the concave surface of the fingerprint sensor, the performance of the fingerprint sensor is accurately evaluated, and specifically, the generated softness of the simulated fingerprint is lower than 50 HA.
According to the method for manufacturing the simulated fingerprint by the solid black conductive silica gel, provided by the embodiment of the invention, the generated simulated fingerprint has preset softness, and the identification rate is high when the capacitive fingerprint sensor is evaluated, so that the deviation between the false rejection rate and the false acceptance rate of the evaluated capacitive fingerprint sensor is small, and the product performance of the capacitive fingerprint sensor can be correctly evaluated by the simulated fingerprint.
According to the method for manufacturing the simulated fingerprint by the solid black conductive silica gel, provided by the embodiment of the invention, the solid black conductive silica gel poured into the fingerprint mold is pressed, so that the ridge and valley characteristics in the fingerprint mold are printed on the solid black conductive silica gel, and the obtained simulated fingerprint is soft in texture and has the thickness of 0.010mm-1.5 mm.
In the above embodiments of the present invention, the solid conductive adhesive is taken as an example to illustrate the production of the artificial fingerprint, and for those skilled in the art, the liquid conductive material may also be used to produce the artificial fingerprint, and the detailed schematic process is described in the following fifth embodiment.
EXAMPLE five
An embodiment of the present invention provides a method for manufacturing an artificial fingerprint, where the artificial fingerprint is used for testing a capacitive fingerprint sensor, as shown in fig. 7, the method includes:
s51, fingerprint ridge and valley characteristics of the fingerprint image collected in advance are subjected to sharpening, and a fingerprint mold is manufactured according to the fingerprint image subjected to sharpening, so that the fingerprint ridge and valley characteristics are formed on the fingerprint mold. The detailed technology for manufacturing the fingerprint mold is similar to that of the third embodiment, and is not repeated herein.
And S52, adopting a liquid conductive material and manufacturing and generating the simulated fingerprint based on the fingerprint mold with the fingerprint ridge and valley characteristics.
Specifically, the liquid conductive material may be coated on the fingerprint mold, so that the fingerprint ridge and valley features on the fingerprint mold are imprinted on the film layer formed by the liquid conductive material.
For a detailed description of the coating, reference is made to the following schematic description of example six.
EXAMPLE six
The invention provides a flow chart of an embodiment of a method for manufacturing an artificial fingerprint by using a liquid conductive material, as shown in fig. 8, the method comprises the following steps:
and S61, acquiring fingerprints, preprocessing the fingerprints, and generating a fingerprint mold.
This step is explained in detail in the above embodiments, and is not described herein again. The fingerprint molds obtained in the above embodiments can be used in this embodiment.
And S62, uniformly coating the liquid conductive material on the fingerprint mold.
And S63, drying the liquid conductive material, and imprinting the fingerprint ridge and valley characteristics on the fingerprint mold onto the film layer formed by the liquid conductive material.
And S64, taking down the dried film layer of the printed and engraved liquid conductive material to obtain the simulated fingerprint.
In addition, the liquid conductive material may include wood glue, gelatin, etc., and the specific drying time may be determined by those skilled in the art according to the material characteristics, and will not be described herein.
In the method for manufacturing the simulated fingerprint by using the liquid conductive material, the liquid conductive material is coated on the fingerprint mold, so that the fingerprint ridge and valley characteristics on the fingerprint mold are imprinted on the film layer formed by the liquid cured conductive material, and the thickness of the obtained simulated fingerprint is within the range of 0.010mm-1.5 mm; meanwhile, the simulated fingerprint formed by the liquid conductive material has preset softness, so that the shape of the simulated fingerprint is changed under the condition that the ridge and valley characteristics are not damaged, and the simulated fingerprint is attached to the concave surface of the fingerprint sensor so as to accurately evaluate the performance of the fingerprint sensor.
EXAMPLE seven
The present invention provides a schematic flow chart of an embodiment of a method for manufacturing a simulated fingerprint by using conductive ink, in this embodiment, a manufacturing process is described by taking conductive silver ink as an example, as shown in fig. 9, which includes:
and S71, collecting fingerprints and preprocessing the fingerprints.
The preprocessing is to perform a sharpening process on the fingerprint image, and the specific processing process is explained in detail in the above embodiments and is not described herein again.
And S72, printing the conductive ink on a material by taking the fingerprint image after the sharpening treatment as a template.
Specifically, in this embodiment, the printed fingerprint image is a fingerprint image that has not undergone valley-ridge conversion after being subjected to sharpening, and because the fingerprint image acquired by the acquisition method in the above step and the fingerprint image recognized by the fingerprint sensor have a mirror image relationship, in this embodiment, before printing the conductive ink on the material, the method further includes, with the fingerprint image subjected to sharpening as a template: and carrying out mirror image processing on the fingerprint image. At this time, the printing adopts normal printing. If the fingerprint image is not subjected to mirror image processing, the printer needs to mirror image-print the fingerprint image after the sharpening processing.
In this embodiment, when the fingerprint image after the sharpening process is printed, the printing material used is conductive ink, so that the printed ridge features can be conductive, the valley features are non-conductive, the non-conductive valley features can be defaulted to be very large in resistance value, so that the capacitance values of the ridge and valley features identified by the capacitive fingerprint sensor are different when the capacitive fingerprint sensor is evaluated, and the requirement of the capacitive fingerprint identification is met. Specifically, in this embodiment, the conductive ink may be conductive silver ink.
After printing is finished, when ridge features included in the simulated fingerprint obtained by printing are a plurality of electric conductors, conductive wires are added on the simulated fingerprint, and all ridge features of the simulated fingerprint are electrically connected into one electric conductor on the basis of not influencing the identification of the simulated fingerprint.
Specifically, after printing is completed, a circle of conductive wire can be added around the simulated fingerprint, and a thinner conductive wire can be added inside the simulated fingerprint, so that all ridge features of the simulated fingerprint are electrically connected into a conductive body.
Conductive silver ink is printed onto a material, such as photographic paper. Compared with printing through other paper, the fingerprint image printed through the photo paper can be kept on the paper for a longer time, and the quality of the photo paper is better, so that the simulated fingerprint has a longer service life.
Specifically, the material has a preset softness, so that the simulated fingerprint can be better attached to the concave surface of the fingerprint sensor, and the performance of the fingerprint sensor can be accurately evaluated.
According to the method for manufacturing the simulated fingerprint by printing, the fingerprint image after the sharpening processing is used as the template, the conductive ink is printed on the material, the ridge and valley characteristics of the obtained simulated fingerprint are obvious, the recognition rate is high when the capacitive fingerprint sensor is evaluated by using the simulated fingerprint, and therefore the product performance of the capacitive fingerprint sensor can be correctly evaluated.
It should be noted that the simulated fingerprint manufactured in the above embodiment is not limited to be used for testing a capacitive fingerprint sensor, and the simulated fingerprint for testing other types of fingerprint sensors may be manufactured by replacing different materials for manufacturing the simulated fingerprint, for example, the material for manufacturing the simulated fingerprint is changed into a flesh-colored material, and the manufactured simulated fingerprint may be used for testing an optical fingerprint sensor.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A method for making a simulated fingerprint is characterized by comprising the following steps:
carrying out fingerprint ridge and valley feature sharpening on a fingerprint image acquired in advance, manufacturing a fingerprint mold according to the fingerprint image subjected to sharpening, and enabling the fingerprint ridge and valley feature to be formed on the fingerprint mold, wherein when the fingerprint mold is manufactured according to the fingerprint image subjected to sharpening, ridge and valley conversion is carried out on the fingerprint image, so that the fingerprint ridge and valley feature of the fingerprint image is changed into the fingerprint ridge and ridge feature on the fingerprint mold, and the fingerprint ridge and ridge feature of the fingerprint image is changed into the fingerprint valley and ridge feature on the fingerprint mold;
manufacturing and generating a simulated fingerprint by adopting a solid conductive material or a liquid conductive material and based on a fingerprint mold with the fingerprint ridge and valley characteristics, wherein the simulated fingerprint is used for testing a fingerprint sensor;
wherein, adopt solid conducting material to produce the emulation fingerprint preparation based on having the fingerprint mould preparation of fingerprint ridge valley characteristic and produce emulation fingerprint includes: before the solid conductive material is poured into the fingerprint mold, adding a curing agent capable of forming the solid conductive material for multiple times, kneading the curing agent and the solid conductive material for multiple times after adding the curing agent each time, and fully mixing the curing agent and the solid conductive material; and pressing the solid conductive material poured onto the fingerprint mold to enable the pressed solid conductive material to have a set thickness, and enabling the fingerprint ridge and valley characteristics on the fingerprint mold to be imprinted on the pressed solid conductive material to generate the simulated fingerprint.
2. The method of claim 1, wherein performing fingerprint ridge and valley feature sharpening on the pre-captured fingerprint image comprises: and carrying out binarization processing on the pre-acquired fingerprint image according to a set threshold value so as to clarify fingerprint ridge and valley characteristics.
3. The method of claim 1, further comprising: classifying the pre-acquired fingerprint images according to different acquisition states, and setting different thresholds for different types of the pre-acquired fingerprint images;
the binarization of the pre-collected fingerprint image according to a set threshold value to make the fingerprint ridge and valley characteristics clear comprises the following steps: and carrying out binarization processing on the pre-acquired fingerprint image of the type according to a threshold value set for the pre-acquired fingerprint image of the type, so that the fingerprint ridge and valley characteristics are clear.
4. The method according to claim 1, wherein after fingerprint ridge and valley feature sharpening is performed on a pre-acquired fingerprint image, the width ratio of the valley features to the ridge features of the fingerprint image after sharpening is obtained, and the width ratio of the valley features to the ridge features corresponding to a real finger is consistent.
5. The method of claim 1, wherein the step of creating a fingerprint mold from the fingerprint image after the sharpening process, and the step of forming the fingerprint ridge feature on the fingerprint mold comprises: and converting the fingerprint image after the sharpening treatment into a fingerprint image which can be identified by printed circuit board production control software, outputting a circuit board description file, and manufacturing a printed circuit board fingerprint mold according to the circuit board description file.
6. The method of claim 1, wherein the step of creating a fingerprint mold from the fingerprint image after the sharpening process, and the step of forming the fingerprint ridge feature on the fingerprint mold comprises:
printing the fingerprint image after the sharpening treatment on a film, and pasting the film printed with the fingerprint image after the sharpening treatment on a printed circuit board comprising a photosensitive film;
and processing the printed circuit board with the film with the fingerprint image to form a printed circuit board fingerprint mold.
7. The method of claim 1, wherein the pressing the solid conductive material poured onto the fingerprint mold comprises: and pressing the solid conductive material poured onto the fingerprint mold for a set time, and printing the fingerprint ridge and valley characteristics on the fingerprint mold on the pressed solid conductive material to generate a simulated fingerprint, wherein the set time is determined according to the solid conductive material subjected to pressing.
8. The method according to any one of claims 1 or 7, further comprising: and carrying out molding treatment on the solid conductive material to enable the depth difference of the ridge-valley features on the pressed solid conductive material to be 0.010-0.1 mm.
9. The method according to claim 1, wherein the curing agent capable of forming the solid conductive material is added in multiple portions, and the curing agent and the solid conductive material are kneaded multiple times after each addition of the curing agent, so that the curing agent and the solid conductive material are mixed thoroughly, and the softness of the solid conductive material after the addition of the curing agent is 10-50 HA.
10. The method of claim 9, wherein the volume of the curing agent added is greater than one twentieth of the volume of the solid conductive material.
11. The method according to claim 1, wherein before the pressing process of the solid conductive material poured onto the fingerprint mold, the method further comprises: and coating a layer of isolating material on the fingerprint mold to prevent the solid conductive material from being bonded with the fingerprint mold.
12. The method of claim 1, wherein the simulated fingerprint satisfies at least one or more of the following parameter requirements:
the thickness of the simulated fingerprint is 0.010mm-1.5 mm;
the softness of the simulated fingerprint is lower than 50 HA;
the resistance value of the simulated fingerprint is 0-50M omega.
13. The method of claim 1, wherein generating the simulated fingerprint comprises:
and coating a liquid conductive material on the fingerprint mold, and imprinting the fingerprint ridge and valley characteristics on the fingerprint mold onto a film layer formed by the liquid conductive material to generate the simulated fingerprint.
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| PCT/CN2016/107299 WO2018094694A1 (en) | 2016-11-25 | 2016-11-25 | Artificial fingerprint manufacturing method |
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| CN109514773A (en) * | 2018-10-17 | 2019-03-26 | 广州市高奈特网络科技有限公司 | A kind of production method emulating fingerprint |
| CN109977889B (en) * | 2019-03-29 | 2021-04-30 | 深圳市利成兴科技有限公司 | Fingerprint collector |
| CN110674745B (en) * | 2019-09-24 | 2022-11-04 | 山东省计算中心（国家超级计算济南中心） | Fingerprint restoration method and system based on field legacy fingerprints |
| CN110839107A (en) * | 2019-10-29 | 2020-02-25 | 大连宏利信网络科技有限公司 | Mobile phone unlocking method |
| CN111310677B (en) * | 2020-02-21 | 2023-10-27 | 维沃移动通信有限公司 | Fingerprint image processing method and electronic equipment |
| CN116758593A (en) * | 2023-08-17 | 2023-09-15 | 荣耀终端有限公司 | Prosthetic fingerprint model and manufacturing method thereof |
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