CN104978575A - Fingerprint identification system and operation method thereof - Google Patents
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Abstract
本发明公开了一种指纹辨识系统，其包括指纹感测单元、压力感测单元以及中央处理单元，中央处理单元与指纹感测单元以及压力感测单元电性耦接，指纹感测单元是用以输出多个第一指纹感测影像，压力感测单元设置于指纹感测单元的下方，用以输出多个第一感测压力值，中央处理单元是用以接收多个第一指纹感测影像以及对应的多个第一感测压力值，并据以得到对应多个第一感测压力值的多个第一压力亮度参数，并判断多个第一压力亮度参数的一亮度变化量是否等于或大于一亮度门槛值，若判断为是，中央处理器判断上述的多个第一指纹感测影像为真。
The invention discloses a fingerprint identification system, which includes a fingerprint sensing unit, a pressure sensing unit and a central processing unit. The central processing unit is electrically coupled to the fingerprint sensing unit and the pressure sensing unit. The fingerprint sensing unit is To output a plurality of first fingerprint sensing images, the pressure sensing unit is disposed below the fingerprint sensing unit for outputting a plurality of first sensing pressure values, and the central processing unit is used to receive a plurality of first fingerprint sensing images. images and corresponding first sensed pressure values, and thereby obtain a plurality of first pressure brightness parameters corresponding to the plurality of first sensed pressure values, and determine whether a brightness change amount of the plurality of first pressure brightness parameters is Equal to or greater than a brightness threshold, if the determination is yes, the central processor determines that the above-mentioned plurality of first fingerprint sensing images are true.
Description
技术领域technical field
本发明是有关于一种指纹辨识系统，尤其是有关于一种可辨别指纹真伪的指纹辨识系统以及其操作方法。The present invention relates to a fingerprint identification system, in particular to a fingerprint identification system capable of distinguishing the authenticity of fingerprints and its operating method.
背景技术Background technique
每个人天生都具有不同的指纹，因此指纹具有极高的辨识度，又真人的指纹几乎不可能伪造，因此指纹已成为新兴的加密解锁工具。而虽然真人的指纹具有上述的优点，但目前的辨识系统仍不足以完全辨识受测指纹的真伪，仍可能发生以伪造指纹成功解锁的情况，因此如何有效的检测受测指纹的真实性，即为目前指纹辨识系统的重要课题。Everyone is born with different fingerprints, so fingerprints are highly recognizable, and it is almost impossible to forge the fingerprints of real people, so fingerprints have become an emerging encryption unlocking tool. Although the fingerprint of a real person has the above-mentioned advantages, the current identification system is still not enough to fully identify the authenticity of the fingerprint under test, and it may still happen that a fake fingerprint is successfully unlocked. Therefore, how to effectively detect the authenticity of the fingerprint under test, It is an important subject of the current fingerprint recognition system.
发明内容Contents of the invention
为了在指纹辨识时能有效辨别指纹真伪，本发明提出一种指纹辨识系统实施例，其包括：一指纹感测单元，是用以输出多个第一指纹感测影像；一压力感测单元设置于指纹感测单元的下方，用以输出多个第一感测压力值；以及一中央处理单元，中央处理单元与指纹感测单元以及压力感测单元电性耦接，是用以接收多个第一指纹感测影像以及对应的多个第一感测压力值，并据以得到对应多个第一感测压力值的多个第一压力亮度参数，并判断多个第一压力亮度参数的一亮度变化量是否等于或大于一亮度门槛值，若判断为是，中央处理器判断上述的多个第一指纹感测影像为真。In order to effectively identify the authenticity of fingerprints during fingerprint identification, the present invention proposes an embodiment of a fingerprint identification system, which includes: a fingerprint sensing unit for outputting a plurality of first fingerprint sensing images; a pressure sensing unit It is arranged under the fingerprint sensing unit to output a plurality of first sensed pressure values; and a central processing unit, which is electrically coupled with the fingerprint sensing unit and the pressure sensing unit, is used to receive multiple a first fingerprint sensing image and a plurality of corresponding first sensing pressure values, and obtain a plurality of first pressure brightness parameters corresponding to the plurality of first sensing pressure values, and determine the plurality of first pressure brightness parameters Whether a change in brightness is equal to or greater than a brightness threshold, if yes, the central processing unit determines that the plurality of first fingerprint sensing images are true.
在其他实施例中，指纹辨识系统更可包括一储存单元，储存单元与中央处理单元电性耦接，用以储存中央处理单元由指纹感测单元输出的多个第二指纹感测影像以及压力感测单元对应输出的多个第二感测压力值而得的多个第二压力亮度参数。In other embodiments, the fingerprint identification system may further include a storage unit electrically coupled to the central processing unit for storing a plurality of second fingerprint sensing images and pressure output by the central processing unit from the fingerprint sensing unit. The sensing unit outputs a plurality of second pressure brightness parameters corresponding to the outputted plurality of second sensed pressure values.
本发明更提出一种指纹辨识系统的操作方法实施例，指纹辨识系统包括一指纹感测单元、一压力感测单元以及一中央处理单元，中央处理单元与指纹感测单元以及压力感测单元电性耦接，指纹感测单元用以输出多个第一指纹感测影像，压力感测单元设置于指纹感测单元下方，用以输出多个第一感测压力值，指纹辨识系统的操作方法包括以下步骤：使指纹感测单元输出多个第一指纹感测影像并使压力感测单元对应输出多个第一感测压力值；使中央处理单元接收多个第一指纹感测影像以及多个第一感测压力值并得到对应多个第一感测压力值的多个第一压力亮度参数；使中央处理单元判断多个第一压力亮度参数的一亮度变化量是否等于或大于一亮度门槛值；当判断为是，多个第一指纹感测影像为真；当判断为否，多个第一指纹感测影像为假。The present invention further proposes an embodiment of an operation method of a fingerprint identification system. The fingerprint identification system includes a fingerprint sensing unit, a pressure sensing unit, and a central processing unit. The central processing unit is connected to the fingerprint sensing unit and the pressure sensing unit. Sexually coupled, the fingerprint sensing unit is used to output a plurality of first fingerprint sensing images, the pressure sensing unit is arranged under the fingerprint sensing unit, and is used to output a plurality of first sensing pressure values, the operation method of the fingerprint recognition system The method comprises the following steps: causing the fingerprint sensing unit to output a plurality of first fingerprint sensing images and causing the pressure sensing unit to correspondingly output a plurality of first sensed pressure values; making the central processing unit receive the plurality of first fingerprint sensing images and the plurality of fingerprint sensing images. a first sensed pressure value and obtain a plurality of first pressure brightness parameters corresponding to the plurality of first sensed pressure values; make the central processing unit judge whether a brightness variation of the plurality of first pressure brightness parameters is equal to or greater than a brightness The threshold value; when the judgment is yes, the plurality of first fingerprint sensing images are true; when the judgment is no, the plurality of first fingerprint sensing images are false.
在其他实施例中，指纹辨识系统更包括一储存单元，与中央处理器电性耦接。指纹辨识系统的操作方法更包括：使指纹感测单元输出多个第二指纹感测影像并使压力感测单元对应输出多个第二感测压力值；使中央处理单元接收多个第二指纹感测影像以及多个第二感测压力值并据以得到对应多个第二感测压力值的多个第二压力亮度参数；使储存单元储存多个第二压力亮度参数以及对应的这些第二感测压力值。In other embodiments, the fingerprint identification system further includes a storage unit electrically coupled to the central processing unit. The operation method of the fingerprint recognition system further includes: making the fingerprint sensing unit output a plurality of second fingerprint sensing images and making the pressure sensing unit correspondingly output a plurality of second sensed pressure values; making the central processing unit receive a plurality of second fingerprints Sensing images and a plurality of second sensed pressure values to obtain a plurality of second pressure brightness parameters corresponding to the plurality of second sensed pressure values; making the storage unit store a plurality of second pressure brightness parameters and the corresponding first pressure brightness parameters 2. Sensing the pressure value.
在其他实施例中，指纹辨识系统的操作方法更包括：亮度门槛值为多个第二压力亮度参数对应这些第二感测压力值的一亮度变化量，且多个第二感测压力值与多个第一感测压力值相同。In other embodiments, the operating method of the fingerprint identification system further includes: the brightness threshold value corresponds to a brightness variation of the second pressure brightness parameters corresponding to the second sensed pressure values, and the plurality of second sensed pressure values and The multiple first sensed pressure values are the same.
综以上所述，本发明的指纹辨识系统是根据使用者按压指纹的压力值与对应的指纹感测影像的亮度变化来判断指纹的真伪，由于真实的指纹在不同压力下会造成不同亮度分布的感测影像，而此亮度分布的特性并非其他伪造指纹可轻易复制的，因此本发明的指纹辨识系统可有效辨别待测指纹的真伪，提高指纹辨识系统的正确性。To sum up, the fingerprint identification system of the present invention judges the authenticity of the fingerprint based on the pressure value of the user pressing the fingerprint and the brightness change of the corresponding fingerprint sensing image, because real fingerprints will cause different brightness distributions under different pressures. Sensing image, and the characteristics of this brightness distribution cannot be easily copied by other forged fingerprints. Therefore, the fingerprint identification system of the present invention can effectively identify the authenticity of the fingerprint to be tested and improve the accuracy of the fingerprint identification system.
为让本发明的上述和其他目的、特征和优点能更明显易懂，下文特举较佳实施例并配合所附图式做详细说明如下。In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with accompanying drawings.
附图说明Description of drawings
图1为本发明的指纹辨识系统实施例一示意图。FIG. 1 is a schematic diagram of Embodiment 1 of the fingerprint identification system of the present invention.
图2为本发明的指纹感测影像示意图。FIG. 2 is a schematic diagram of a fingerprint sensing image of the present invention.
图3为本发明的感测压力值与压力亮度参数的关系示意图。FIG. 3 is a schematic diagram of the relationship between the sensed pressure value and the pressure brightness parameter in the present invention.
图4为本发明的指纹辨识系统实施例二示意图。FIG. 4 is a schematic diagram of Embodiment 2 of the fingerprint identification system of the present invention.
图5为本发明指纹辨识系统实施例一的运作流程示意图。FIG. 5 is a schematic diagram of the operation flow of Embodiment 1 of the fingerprint identification system of the present invention.
图6为本发明指纹辨识方法的运作流程示意图。FIG. 6 is a schematic diagram of the operation flow of the fingerprint identification method of the present invention.
图7为本发明指纹辨识系统另一运作流程示意图。FIG. 7 is a schematic diagram of another operation flow of the fingerprint identification system of the present invention.
其中，附图标记：Among them, reference signs:
10指纹辨识系统10Fingerprint identification system
11指纹感测单元11 Fingerprint sensing unit
12压力感测单元12 pressure sensing unit
13中央处理单元13 central processing unit
14储存单元14 storage units
△L亮度变化量△L Brightness variation
501,502,503,504,505,506,507,601,602,603,604,605,606,607,701,702,703,704,705步骤501,502,503,504,505,506,507,601,602,603,604,605,606,607,701,702,703,704,705 steps
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明进行详细描述，但不作为对本发明的限定。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
请参阅图1，图1为本发明的指纹辨识系统10实施例一的示意图，指纹辨识系统10包括一指纹感测单元11、一压力感测单元12以及一中央处理单元13，指纹感测单元11与中央处理单元13电性耦接，是用以感测待测指纹并在使用者一次按压指纹的时间内输出多个第一指纹感测影像至中央处理单元13，其中指纹感测单元11可以为光学式指纹辨识装置、电容式指纹辨识装置或其他可输出多个第一指纹感测影像的感测装置。压力感测单元12设置于指纹感测单元11下方并与中央处理单元13电性耦接，是用以在使用者将指纹按压于指纹感测单元11时，根据使用者在一次按压指纹的施力输出多个第一感测压力值至中央处理单元13。Please refer to FIG. 1. FIG. 1 is a schematic diagram of Embodiment 1 of a fingerprint recognition system 10 of the present invention. The fingerprint recognition system 10 includes a fingerprint sensing unit 11, a pressure sensing unit 12 and a central processing unit 13. The fingerprint sensing unit 11 is electrically coupled with the central processing unit 13, and is used to sense the fingerprint to be tested and output a plurality of first fingerprint sensing images to the central processing unit 13 within the time when the user presses the fingerprint once, wherein the fingerprint sensing unit 11 It may be an optical fingerprint identification device, a capacitive fingerprint identification device or other sensing devices capable of outputting a plurality of first fingerprint sensing images. The pressure sensing unit 12 is arranged under the fingerprint sensing unit 11 and is electrically coupled with the central processing unit 13. The force outputs a plurality of first sensed pressure values to the central processing unit 13 .
中央处理单元13与指纹感测单元11以及压力感测单元12电性耦接，用以接收上述的多个第一指纹感测影像以及对应的多个第一感测压力值，使每一第一指纹感测影像可对应至一个第一感测压力值，如图2所示。图2中，每一个第一指纹感测影像的下标为对应的第一感测压力值，因此，以图2上排最左的第一指纹感测影像为例，其为使用者按压指纹施力50g时所得到的指纹感测影像，而图2上排最右的第一指纹感测影像即为使用者按压指纹施力500g时所得到的指纹感测影像，且由图2可以看出，施力越大的指纹感测影像具有较高的亮度，即图2中使用者施力1500g的指纹感测影像的亮度明显高于使用者施力50g时的指纹感测影像的亮度，这是因为当使用者施力越大时，指纹中凸起的指纹峰会因为压力而扁平，导致指纹峰与凹陷的指纹谷之间的差异变小，因此指纹感测单元11进行感测时会得到指纹峰与指纹谷差异较小的指纹感测影像，也就是得到亮度较高的指纹感测影像。The central processing unit 13 is electrically coupled with the fingerprint sensing unit 11 and the pressure sensing unit 12, and is used to receive the above-mentioned multiple first fingerprint sensing images and the corresponding multiple first sensing pressure values, so that each first A fingerprint sensing image may correspond to a first sensing pressure value, as shown in FIG. 2 . In FIG. 2, the subscript of each first fingerprint sensing image is the corresponding first sensing pressure value. Therefore, taking the leftmost first fingerprint sensing image in the upper row of FIG. 2 as an example, it is the user pressing the fingerprint The fingerprint sensing image obtained when a force of 50g is applied, and the first fingerprint sensing image on the upper right in Figure 2 is the fingerprint sensing image obtained when the user presses the fingerprint and applies a force of 500g, and it can be seen from Figure 2 It can be seen that the fingerprint sensing image with greater force has higher brightness, that is, the brightness of the fingerprint sensing image when the user applies a force of 1500g in Figure 2 is significantly higher than the brightness of the fingerprint sensing image when the user applies a force of 50g, This is because when the user exerts more force, the raised fingerprint peaks in the fingerprint will be flattened due to the pressure, resulting in a smaller difference between the fingerprint peaks and the depressed fingerprint valleys, so the fingerprint sensing unit 11 will A fingerprint sensing image with a smaller difference between the fingerprint peak and the fingerprint valley is obtained, that is, a fingerprint sensing image with higher brightness is obtained.
中央处理单元13更根据对应多个第一感测压力值的多个第一指纹感测影像的亮度分布得到对应这些第一感测压力值的多个第一压力亮度参数，也就是每一个第一感测压力值所对应的第一指纹感测影像皆可转换成一第一压力亮度参数，如图3所示，且随着感测压力值越大，第一压力亮度参数的亮度会越高，也就是第一压力亮度参数的亮度正比于对应的第一指纹感测影像，此外，不同感测压力值之间的亮度差为亮度变化量△L。其中，中央处理单元13可先计算出每一个第一指纹感测影像中的亮度分布，例如每一个第一指纹感测影像中对应每一个灰阶值的像素量，接着根据第一指纹感测影像中每一个灰阶值的像素量得到正比于亮度的第一压力亮度参数，例如将第一指纹感测影像中的所有灰阶值乘上对应的像素量后相加以作为上述的第一压力亮度参数。The central processing unit 13 further obtains a plurality of first pressure brightness parameters corresponding to the first sensed pressure values according to the brightness distribution of the plurality of first fingerprint sensing images corresponding to the first sensed pressure values, that is, each first sensed pressure value A first fingerprint sensing image corresponding to a sensed pressure value can be converted into a first pressure brightness parameter, as shown in FIG. 3 , and as the sensed pressure value increases, the brightness of the first pressure brightness parameter will be higher. , that is, the brightness of the first pressure brightness parameter is proportional to the corresponding first fingerprint sensing image, and the brightness difference between different sensing pressure values is the brightness variation ΔL. Wherein, the central processing unit 13 may first calculate the brightness distribution in each first fingerprint sensing image, for example, the amount of pixels corresponding to each grayscale value in each first fingerprint sensing image, and then according to the first fingerprint sensing image The amount of pixels of each grayscale value in the image obtains the first pressure brightness parameter proportional to the brightness, for example, multiplying all the grayscale values in the first fingerprint sensing image by the corresponding pixel amount and adding them together as the above-mentioned first pressure Brightness parameter.
而由于真实指纹的压力亮度参数具有一定的变化量，因此当中央处理单元13辨识指纹真伪时，中央处理单元13可藉由判断多个第一压力亮度参数之间的亮度变化量△L是否等于或大于一亮度门槛值来判定待测指纹的真伪，例如：多个第一感测压力值的范围为50g-400g，而感测压力值50g的压力亮度参数与感测压力值400g的压力亮度参数的亮度差即为亮度变化量△L，中央处理单元13再判断此亮度变化量△L是否大于或等于预设的亮度门槛值，也就是若亮度变化量△L等于或大于亮度门槛值，中央处理器13判断接收的多个第一指纹感测影像为真，即目前待测的指纹为真指纹；若亮度变化量△L小于亮度门槛值，中央处理器13判断接收的多个第一指纹感测影像为假，也就是目前待测的指纹为假指纹。此外，为了使指纹辨识系统10更准确的辨认指纹的真伪，中央处理单元13更可判断所接收的多个第一感测压力值的最大值是否大于一第一感测压力门槛值，例如最大的第一感测压力值是否大于300g的第一感测压力门槛值，以得到较高的亮度变化量△L，提升辨认指纹的正确度。Since the pressure brightness parameters of real fingerprints have a certain amount of variation, when the central processing unit 13 identifies the authenticity of the fingerprints, the central processing unit 13 can judge whether the brightness variation ΔL among the first pressure brightness parameters is Equal to or greater than a brightness threshold value to determine the authenticity of the fingerprint to be tested, for example: the range of multiple first sensed pressure values is 50g-400g, and the pressure brightness parameter of the sensed pressure value of 50g is the same as that of the sensed pressure value of 400g The brightness difference of the pressure brightness parameter is the brightness variation ΔL, and the central processing unit 13 then judges whether the brightness variation ΔL is greater than or equal to the preset brightness threshold, that is, if the brightness variation ΔL is equal to or greater than the brightness threshold value, the central processing unit 13 judges that the multiple first fingerprint sensing images received are true, that is, the fingerprint to be tested is a real fingerprint; The first fingerprint sensing image is false, that is, the fingerprint to be detected is a false fingerprint. In addition, in order to enable the fingerprint identification system 10 to more accurately identify the authenticity of the fingerprint, the central processing unit 13 can further determine whether the maximum value of the received multiple first sensed pressure values is greater than a first sensed pressure threshold, for example Whether the maximum first sensing pressure value is greater than the first sensing pressure threshold value of 300g, so as to obtain a higher brightness variation ΔL and improve the accuracy of fingerprint identification.
在其他实施例中，指纹辨识系统10实施例更可包括一储存单元14，如图4所示，储存单元14与上述的中央处理单元13电性耦接，因此在本实施例中，指纹辨识系统10更可预先储存对应不同使用者的压力亮度参数，以更精准的辨别指纹真伪。故在辨别指纹真伪前，使用者先使上述的指纹感测单元11根据使用者所按压的指纹得到多个第二指纹感测影像，同时压力感测单元12也得到多个第二感测压力值，中央处理单元13即可根据上述的内容，从对应多个第二感测压力值的多个第二指纹感测影像得到对应多个第二感测压力值的多个第二压力亮度参数，并使储存单元14储存这些对应多个第二感测压力值的多个第二压力亮度参数。此外，为了更精准进行指纹真伪的辨识，中央处理单元13可判断多个第二感测压力值的最大值是否超过一第二感测压力门槛值，例如1000g，也就是判断使用者按压指纹的压力值范围是否够广，以包含分布足够的第二压力亮度参数，避免出现储存的第二压力亮度参数范围太窄而不足以比对的情况发生，例如：储存单元14储存了对应50g至500g的多个第二压力亮度参数，然在进行指纹真伪的辨别时，使用者按压了100g至750g的多个第一指纹感测影像，因此得到多个第一压力亮度参数，但储存单元14因为仅储存对应50g至500g的第二感测压力值的多个第二压力亮度参数，因此多个第二压力亮度参数的亮度变化量无法与使用者按压指纹而产生的多个第一压力亮度参数的亮度变化量来比对。In other embodiments, the embodiment of the fingerprint identification system 10 may further include a storage unit 14. As shown in FIG. 4, the storage unit 14 is electrically coupled to the above-mentioned central processing unit 13. The system 10 can also pre-store pressure brightness parameters corresponding to different users, so as to more accurately identify the authenticity of fingerprints. Therefore, before identifying the authenticity of the fingerprint, the user first makes the above-mentioned fingerprint sensing unit 11 obtain a plurality of second fingerprint sensing images according to the fingerprint pressed by the user, and at the same time, the pressure sensing unit 12 also obtains a plurality of second sensing images. pressure value, the central processing unit 13 can obtain a plurality of second pressure luminances corresponding to a plurality of second sensing pressure values from a plurality of second fingerprint sensing images corresponding to a plurality of second sensing pressure values according to the above-mentioned content parameters, and make the storage unit 14 store the plurality of second pressure brightness parameters corresponding to the plurality of second sensed pressure values. In addition, in order to more accurately identify the authenticity of fingerprints, the central processing unit 13 can determine whether the maximum value of multiple second sensing pressure values exceeds a second sensing pressure threshold, such as 1000g, that is, to determine whether the user presses the fingerprint Whether the range of the pressure value is wide enough to include the second pressure brightness parameter with sufficient distribution, so as to avoid the situation that the range of the stored second pressure brightness parameter is too narrow to be compared. Multiple second pressure brightness parameters of 500g. However, when identifying the authenticity of fingerprints, the user presses multiple first fingerprint sensing images ranging from 100g to 750g, so multiple first pressure brightness parameters are obtained, but the storage unit 14 Because only the multiple second pressure brightness parameters corresponding to the second sensed pressure value of 50g to 500g are stored, the brightness variation of the multiple second pressure brightness parameters cannot be compared with the multiple first pressure brightness parameters generated by the user pressing the fingerprint The brightness change amount of the brightness parameter is compared.
在上述的实施例中，当中央处理单元13辨识指纹真伪时，中央处理单元13可根据使用者所按压的多个第一感测压力值，例如50g至300g，从储存单元14中得到使用者预先储存的第二感测压力值50g以及300g所对应的第二压力亮度参数，并将对应于第二感测压力值50g以及300g的第二压力亮度参数之间的亮度变化量△L设定为亮度门槛值。故若对应第一感测压力值50g及300g的第一压力亮度参数之间的亮度变化量△L等于或大于亮度门槛值，中央处理器13判断接收的多个第一指纹感测影像为真，即目前待测的指纹为真指纹；若对应第一感测压力值50g及300g的第一压力亮度参数之间的亮度变化量△L小于亮度门槛值，中央处理器13判断接收的多个第一指纹感测影像为假，也就是目前待测的指纹为假指纹。In the above-mentioned embodiment, when the central processing unit 13 identifies the authenticity of the fingerprint, the central processing unit 13 can use the multiple first sensed pressure values pressed by the user, such as 50g to 300g, from the storage unit 14. or the pre-stored second pressure brightness parameters corresponding to the second sensed pressure values 50g and 300g, and set the brightness variation ΔL between the second pressure brightness parameters corresponding to the second sensed pressure values 50g and 300g as Set as the brightness threshold. Therefore, if the brightness variation ΔL between the first pressure brightness parameters corresponding to the first sensed pressure values 50g and 300g is equal to or greater than the brightness threshold value, the central processing unit 13 judges that the multiple first fingerprint sensing images received are true. , that is, the current fingerprint to be tested is a real fingerprint; if the brightness variation ΔL between the first pressure brightness parameters corresponding to the first sensed pressure value 50g and 300g is smaller than the brightness threshold value, the central processing unit 13 judges that the multiple received The first fingerprint sensing image is false, that is, the fingerprint to be detected is a false fingerprint.
根据上述内容，本发明可归纳出一指纹辨识系统10的操作方法，以下将配合图1指纹辨识系统10实施例一以及图5来说明。首先，使用者按压指纹于该指纹感测单元11，指纹感测单元11据以输出多个第一指纹感测影像，压力感测单元12据以输出多个对应第一指纹感测影像的多个第一感测压力值(步骤501)；接着中央处理单元13接收多个第一指纹感测影像以及对应的多个第一感测压力值，并计算每一个第一指纹感测影像中每一灰阶所对应的像素量(步骤502)；中央处理单元13根据第一指纹感测影像中每一个灰阶值的像素量得到正比于亮度的第一压力亮度参数(步骤503)；使中央处理单元13根据多个第一压力亮度参数得到一亮度变化量，并判断此亮度变化量是否等于或大于一亮度门槛值(步骤504)；若亮度变化量等于或大于亮度门槛值，中央处理单元13判断多个第一指纹感测影像为真(步骤505)；若亮度变化量小于亮度门槛值，中央处理单元13判断多个第一指纹感测影像为假(步骤506)。According to the above content, the present invention can summarize an operation method of the fingerprint identification system 10 , which will be described below in conjunction with Embodiment 1 of the fingerprint identification system 10 shown in FIG. 1 and FIG. 5 . Firstly, the user presses the fingerprint on the fingerprint sensing unit 11, and the fingerprint sensing unit 11 outputs a plurality of first fingerprint sensing images accordingly, and the pressure sensing unit 12 outputs a plurality of multiple images corresponding to the first fingerprint sensing images. first sensing pressure values (step 501); then the central processing unit 13 receives a plurality of first fingerprint sensing images and a plurality of corresponding first sensing pressure values, and calculates each of the first fingerprint sensing images The amount of pixels corresponding to a grayscale (step 502); the central processing unit 13 obtains the first pressure brightness parameter proportional to the brightness according to the pixel amount of each grayscale value in the first fingerprint sensing image (step 503); The processing unit 13 obtains a brightness variation according to a plurality of first pressure brightness parameters, and judges whether the brightness variation is equal to or greater than a brightness threshold (step 504); if the brightness variation is equal to or greater than the brightness threshold, the central processing unit 13. Judging the plurality of first fingerprint sensing images as true (step 505); if the brightness variation is smaller than the brightness threshold, the central processing unit 13 judges the plurality of first fingerprint sensing images as false (step 506).
其中，为了使指纹辨识系统10更准确的辨识指纹的真伪，指纹辨识系统10的操作方法在步骤503后更可包括：使中央处理单元13判断这些第一感测压力值的最大值是否大于一第一感测压力门槛值，若判断为是进行步骤504，若判断为否，回到步骤501(步骤507)。Wherein, in order to enable the fingerprint identification system 10 to identify the authenticity of the fingerprint more accurately, the operation method of the fingerprint identification system 10 may further include: making the central processing unit 13 judge whether the maximum value of these first sensed pressure values is greater than A first sensed pressure threshold, if it is judged yes, go to step 504, if it is judged no, go back to step 501 (step 507).
根据上述内容，本发明更可归纳出一指纹辨识方法。请参阅图6，首先，感测多个第一指纹感测影像以及多个第一感测压力值(步骤601)；计算每一个第一指纹感测影像中每一灰阶所对应的像素量(步骤602)；根据每一个第一指纹感测影像中每一灰阶所对应的像素量得到对应多个第一感测压力值的多个第一压力亮度参数(步骤603)；根据多个第一压力亮度参数得到一亮度变化量，并判断此亮度变化量是否等于或大于一亮度门槛值(步骤604)；若亮度变化量等于或大于亮度门槛值，判断多个第一指纹感测影像为真(步骤605)；若亮度变化量小于亮度门槛值，判断多个第一指纹感测影像为假(步骤606)。According to the above content, the present invention can further summarize a fingerprint identification method. Please refer to FIG. 6 , first, sense a plurality of first fingerprint sensing images and a plurality of first sensing pressure values (step 601); calculate the number of pixels corresponding to each gray scale in each first fingerprint sensing image (step 602); obtain a plurality of first pressure brightness parameters corresponding to a plurality of first sensed pressure values according to the amount of pixels corresponding to each gray scale in each first fingerprint sensing image (step 603); according to a plurality of Obtain a brightness variation from the first pressure brightness parameter, and determine whether the brightness variation is equal to or greater than a brightness threshold (step 604); if the brightness variation is equal to or greater than the brightness threshold, determine a plurality of first fingerprint sensing images is true (step 605); if the brightness variation is less than the brightness threshold value, it is judged that a plurality of first fingerprint sensing images are false (step 606).
指纹辨识方法在步骤603后更可包括：判断这些第一感测压力值的最大值是否大于一第一感测压力门槛值，若判断为是进行步骤604，若判断为否，回到步骤601(步骤607)。The fingerprint identification method may further include after step 603: judging whether the maximum value of these first sensing pressure values is greater than a first sensing pressure threshold value, if it is judged to be yes, proceed to step 604, if it is judged to be no, return to step 601 (step 607).
除了上述的操作方法，本发明更可在辨别指纹真伪前进行建档的流程，如图7所示，使指纹辨识系统10更可准确的判别指纹真伪。其步骤包括：指纹感测单元11根据使用者所按压的指纹输出多个第二指纹感测影像，压力感测单元12输出多个第二感测压力值(步骤701)；中央处理单元13计算每一个第二指纹感测影像中每一灰阶所对应的像素量(步骤702)；接着中央处理单元13根据每一个第二指纹感测影像中每一灰阶所对应的像素量得到对应多个第二感测压力值的多个第二压力亮度参数(步骤703)；判断多个第二感测压力值的最大值是否大于一第二感测压力门槛值，若判断为是，进行步骤705，若判断为否，回到步骤701(步骤704)；将对应于多个第二感测压力值的多个第二压力亮度参数储存于储存单元14(步骤705)。因此当指纹辨识系统10进行指纹辨识时，可选择相同于多个第一感测压力值的多个第二感测压力值所对应的多个第二压力亮度参数，并将多个第二压力亮度参数的亮度变化量设定为亮度门槛值，以更精准的进行指纹辨识。In addition to the above-mentioned operation method, the present invention can also carry out the process of establishing a file before identifying the authenticity of the fingerprint, as shown in FIG. 7 , so that the fingerprint identification system 10 can more accurately identify the authenticity of the fingerprint. The steps include: the fingerprint sensing unit 11 outputs a plurality of second fingerprint sensing images according to the fingerprint pressed by the user, and the pressure sensing unit 12 outputs a plurality of second sensing pressure values (step 701); the central processing unit 13 calculates The amount of pixels corresponding to each gray scale in each second fingerprint sensing image (step 702); A plurality of second pressure brightness parameters of a second sensed pressure value (step 703); judging whether the maximum value of a plurality of second sensed pressure values is greater than a second sensed pressure threshold value, if it is determined to be yes, proceed to step 705. If the judgment is no, return to step 701 (step 704); store a plurality of second pressure brightness parameters corresponding to a plurality of second sensed pressure values in the storage unit 14 (step 705). Therefore, when the fingerprint identification system 10 performs fingerprint identification, multiple second pressure brightness parameters corresponding to multiple second sensed pressure values that are the same as the multiple first sensed pressure values can be selected, and the multiple second pressure values The brightness variation of the brightness parameter is set as the brightness threshold value for more accurate fingerprint identification.
综以上所述，由于真实的指纹在不同压力下会造成不同亮度分布的感测影像，而此亮度分布的特性并非其他伪造指纹可轻易复制的，因此本发明的指纹辨识系统根据使用者按压指纹的压力值与对应的指纹感测影像的亮度变化来判断指纹的真伪，可有效提高指纹辨识系统的正确性。To sum up, since real fingerprints will produce sensing images with different brightness distributions under different pressures, and the characteristics of this brightness distribution cannot be easily copied by other forged fingerprints, the fingerprint identification system of the present invention is based on the user pressing the fingerprint. The authenticity of the fingerprint can be judged by the pressure value and the brightness change of the corresponding fingerprint sensing image, which can effectively improve the accuracy of the fingerprint identification system.
虽然本发明已以实施例揭露如上，然其并非用以限定本发明，任何熟习此技术者，在不脱离本发明的精神和范围内，当可做些许的更动与润饰，因此本发明的保护范围当视后付的申请专利范围所界定者为准。Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the scope of the patent application to be paid later.
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| Publication number | Publication date |
|---|---|
| TWI604384B (en) | 2017-11-01 |
| TW201640414A (en) | 2016-11-16 |
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