WO2015096803A1 - 手指指纹读取系统及指纹读取方法 - Google Patents

手指指纹读取系统及指纹读取方法 Download PDF

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Publication number
WO2015096803A1
WO2015096803A1 PCT/CN2014/095069 CN2014095069W WO2015096803A1 WO 2015096803 A1 WO2015096803 A1 WO 2015096803A1 CN 2014095069 W CN2014095069 W CN 2014095069W WO 2015096803 A1 WO2015096803 A1 WO 2015096803A1
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Prior art keywords
unit
finger
fingerprint
liquid lens
image acquisition
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PCT/CN2014/095069
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English (en)
French (fr)
Inventor
蔡智伟
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齐发光电股份有限公司
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Publication of WO2015096803A1 publication Critical patent/WO2015096803A1/zh

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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

Definitions

  • the invention relates to a fingerprint reading system and method, in particular to a non-contact finger fingerprint reading system (FINGERPRINT READING SYSTEM) and a fingerprint reading method.
  • a non-contact finger fingerprint reading system FINGERPRINT READING SYSTEM
  • Personal electronic products such as computers or mobile phones, usually contain personal data stored internally.
  • a password lock which requires a pre-set password to enter the use of electronic products.
  • this method of entering a password is still very easy because other people obtain the password by other means, so that the personal data is obtained by others.
  • a contact type fingerprint reader which discriminates the user by the fingerprint recognition function is developed, and the condition of total reflection is destroyed by the contact of the finger fingerprint protrusion with the mirror surface of the prism, so that a light and dark finger fingerprint photograph can be obtained.
  • a contact type fingerprint reader has a high cost and a large volume because of the triangular prism, and the mirror surface of the prism needs a special surface treatment due to contact with a finger, and scratches or corrodes the surface of the glass, and the dirt on the finger is dirty or The fingerprint will remain on the surface of the prism, making subsequent identification difficult and requiring cleaning.
  • the contact type fingerprint reader cannot distinguish the fake fingerprint.
  • non-contact fingerprint readers traditional non-contact fingerprint readers usually require a macro lens to obtain a clear finger-finger photo, and the shooting distance is close enough. Get a large enough magnification with a clear finger print, and this means that the depth of field of the photo is very shallow, it must have a clear finger support member to fix the finger position or an expensive high-order macro lens to get The optical effect of deep depth of field at close range.
  • the present inventors have felt that the above-mentioned defects can be improved, and they have devoted themselves to research and cooperate with the application of the theory, and finally proposed an invention which is reasonable in design and effective in improving the above defects.
  • the present invention provides a finger fingerprint reading system and a fingerprint reading method, which can avoid the problems caused by the prior art described above by the non-contact finger fingerprint reading system and method.
  • an embodiment of the present invention provides a finger fingerprint reading system, including: a lens module, a control module, and a signal processing module.
  • the lens module has a detecting unit and a An image acquisition unit, a liquid lens unit, and a lighting unit.
  • the control module is electrically connected to the lens module to control the image acquisition unit, the liquid lens unit, and the illumination unit.
  • the detecting unit detects a start signal
  • the control module activates the image acquiring unit, the liquid lens unit and the lighting unit, and the liquid lens unit modulates the focusing distance from far to near to perform finger fingerprint scanning, and the image capturing is performed.
  • the unit continuously acquires a plurality of finger fingerprint image photos by using the liquid lens unit to adjust the focusing distance process from far to near, and the signal processing module selects one of the finger fingerprint image photos acquired by the image acquiring unit to be correctly focused. Photo and convert the photo with the correct focus into a fingerprint image.
  • Another embodiment of the present invention provides a fingerprint reading method, including the steps of: detecting that an object is within a reading range; determining an attribute of the object; starting an illumination unit; and starting an image acquisition unit and a liquid lens unit Modulating a focus distance of the liquid lens unit from far to near; obtaining a plurality of consecutive photos of the liquid lens unit from far to near; closing the image acquisition unit, the liquid lens unit, and the illumination unit; selecting a slave image Acquiring a photo with the correct focus in the continuous photo acquired by the unit; and converting the photo with the correct focus in the continuous photo acquired from the image acquisition unit as a picture.
  • Another embodiment of the present invention provides a fingerprint reading method, comprising the steps of: detecting that an object is located within a reading range; determining an attribute of the object; and starting a lighting unit, wherein the lighting unit is the first lighting; An image acquisition unit and a liquid lens unit; modulating and scanning a focusing distance of the liquid lens unit from far to near; obtaining a plurality of consecutive photos of the liquid lens unit from far to near; lighting unit second illumination; modulating and scanning the liquid a focusing distance of the lens unit from far to near; obtaining a plurality of consecutive photos of the liquid lens unit from far to near; closing the image acquiring unit, the liquid lens unit, and the lighting unit; and selecting one obtained from the image acquiring unit Focusing on the correct photo in a continuous photo; and converting the photo with the correct focus in the continuous photo taken from the image acquisition unit as a picture.
  • the fingerprint fingerprint reading system and method provided by the embodiments of the present invention may be composed of a lens module, a control module, and a signal processing module, so that the finger fingerprint reading system of the present invention has an automatic
  • the mechanism of activation can eliminate the problem of identification errors caused by finger movement.
  • FIG. 1 is a block diagram showing a finger fingerprint reading system according to a first embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the principle of focusing plane scanning.
  • FIG. 3 is a schematic diagram of steps of a fingerprint reading method according to a second embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the steps of a fingerprint reading method according to a third embodiment of the present invention.
  • a first embodiment of the present invention provides a finger fingerprint reading system F, which includes a lens module 1 , a control module 2 , and a signal processing module 3 , wherein the lens module 1 , the control module 2 , and The signal processing modules 3 are electrically connected to each other.
  • the lens module 1 has a detecting unit 11, an image acquiring unit 12, a liquid lens unit 13, and a lighting unit 14.
  • the control module 2 controls the image acquisition unit 12, the liquid lens unit 13, and the illumination unit 14.
  • the detecting unit 11 detects the start signal
  • the control module 2 will start the map.
  • the activation signal may be that the detection unit 11 detects the correct finger shape, the correct finger color, or the finger occupies a predetermined retrievable area, for example, the finger occupies 1/3 or 1/2 of the image captured by the entire image acquisition unit 12.
  • the area may also be detected by an active detection type component such as a general infrared scanning, ultrasonic detector or radar, etc., but the invention is not limited by this example. It can make the finger fingerprint reading system F have a mechanism of automatic activation by the detection of the detecting unit 11.
  • an active detection type component such as a general infrared scanning, ultrasonic detector or radar, etc.
  • the illumination on the finger is illuminated by the illumination unit 14, so that the fingerprint on the finger can be strongly contrasted with the background.
  • the light source of illumination unit 14 can be white light, infrared light, ultraviolet light, or other monochromatic light source.
  • the liquid lens unit 13 modulates the focusing distance from far to near to perform a finger fingerprint scanning operation.
  • the image acquisition unit 12 continuously acquires a plurality of finger fingerprint image photos from the far-to-near modulation focus distance by the liquid lens unit 13, and transmits the acquired plurality of consecutive photos to the signal processing module 3.
  • FIG. 2 is a schematic diagram of the principle of focusing surface scanning.
  • the short vertical line in the figure represents the focusing surface, and the horizontal line above represents the depth of field. In general, the closer the focus surface is to the image acquisition unit 12, the shallower the depth of field.
  • the present invention adopts the mechanism of the focus lens scanning of the liquid lens unit 13 to continuously obtain photos of different focus surfaces from far to near, and appropriately
  • the modulation amount of the liquid lens unit 13 is designed such that a continuous photograph can cover the set photographing distance.
  • R1 of depth of field 1 is the depth of field when the focusing distance is 2 cm
  • R2 of depth of field 2 is the depth of field when the focusing distance is 2.5 cm
  • R3 of depth of field 3 is the depth of field when the focusing distance is 3.5 cm
  • depth of field R4 of 4 is the depth of field when the focusing distance is 5 cm.
  • the liquid lens unit 13 modulates the focusing distance from far to near, and the distance between the finger fingerprint scanning is between 10 cm and 1 cm, the most preferred scanning range is 5 cm to 2 cm, and the scanning time for finger fingerprint scanning is less than 0.5 second. More preferably, the scan time is less than 0.3 seconds.
  • the image acquisition unit 12 acquires 3 to 10 finger fingerprint image photos by the liquid lens unit 13, and more preferably takes 4 to 6 images, and transmits the acquired finger fingerprint image to the signal processing module 3.
  • the acquired photos there must be a photo with the correct focus, and since the focus surface adjustment time of the liquid lens unit 13 is fast (at the ⁇ 10 ms level), the completion of the entire scanning distance is not more than 0.5 second, thereby eliminating the finger. Photo blur caused by shaking.
  • the finger fingerprint reading system of the present invention can relax the requirement of the finger position to a limit of 10 cm to 1 cm, and relax the freedom of the user to position his finger.
  • the signal processing module 3 selects one of the finger fingerprint image photos acquired by the image acquiring unit 12 to correct the photo, and then performs the image processing on the photo with the correct focus, first detecting the position of the finger in the photo, and then detecting the position of the finger in the photo. Remove the background other than the finger, and strengthen the contrast, do negative film processing, remove noise, etc. Finally, convert the photo format to standard fingerprint image and send it to the fingerprint identification software for fingerprint comparison.
  • the signal The processing module 3 can be a computer that causes image judgment and image processing to be performed by a computer.
  • the signal processing module 3 and the control module 2 may be an embedded system, and the function is similar to a computer, and the finger fingerprint identification work can be completed.
  • the finger fingerprint reading system F provided by the first embodiment of the present invention can detect the presence or absence of the finger in the reading range of the finger fingerprint reading system F by the detecting unit 11, and then activate the lighting unit 14 Avoid that the finger is not placed in the reading range of the finger fingerprint reading system F, and the lighting unit 14 has been activated, thereby generating glare and glare, which affects the user's line of sight.
  • the lens module 1 can be used as a general camera module, and can be used as a face camera or a video camera.
  • a second embodiment of the present invention provides a fingerprint reading method F200, which includes the following steps.
  • step S200 it is detected whether an object is located within the reading range.
  • an active detection type component such as a general infrared scanning, an ultrasonic detector, or a radar can be used to determine whether the object is in the reading range.
  • step S202 it is determined whether the attribute of the object is a finger, wherein the attribute of the determining object can be determined by reading whether the object is in the correct finger shape, the correct finger color, or the finger occupies a predetermined available area. For example, it may be determined that the object occupies 1/3 or 1/2 of the area of the image captured by the entire image acquisition unit 12, and then determines whether it is the correct finger shape or the finger color.
  • the illumination unit 14 is activated to focus the illumination light on the finger fingerprint, and the illumination unit 14 is irradiated on the finger to form a strong contrast between the fingerprint on the finger and the background.
  • the light source of the illumination unit can be white light, infrared light, ultraviolet light or other monochromatic light source.
  • the image acquisition unit 12 and the liquid lens unit 13 are activated, and the liquid lens unit 13 modulates the scanning operation of the finger fingerprint from far to near.
  • the image acquisition unit 12 continuously acquires a plurality of finger fingerprint image photos from the far-to-near modulation focus distance by the liquid lens unit 13, and transmits the acquired plurality of consecutive photos to the signal processing module 3.
  • the liquid lens unit 13 modulates the focusing distance from far to near, and the distance between the finger fingerprint scanning is between 10 cm and 1 cm, and the most preferable scanning range is 5 cm to 2 cm, and the fingerprint scanning is performed.
  • the time is less than 0.5 seconds, and more preferably the scan time is less than 0.3 seconds.
  • the image acquisition unit 12 acquires 3 to 10 finger fingerprint image photos by the liquid lens unit 13, and more preferably takes 4 to 6 images, and transmits the acquired finger fingerprint image to the signal processing module 3.
  • steps S212 and S214 after the interception is completed, the image acquisition unit, the liquid lens unit, and the illumination unit are turned off, and the photo processing module 3 selects a photo with the correct focus in the continuous photos acquired from the image acquisition unit. Then, the photo with the correct focus is image processed, firstly detecting the position of the finger in the photo, removing the background other than the finger, and strengthening the contrast, performing the negative film processing, clearing the noise, etc., and finally converting the same as shown in step S216.
  • the correct photo format is the standard fingerprint image and then sent to the fingerprint identification software for fingerprint comparison.
  • the fingerprint reading method F200 provided by the second embodiment of the present invention can determine whether an object is located within the reading range by detecting the step, and then determining the manner in which the object is the finger and then the lighting unit 14 is activated, thereby avoiding the cause.
  • the finger is not placed in the reading range, and the illumination unit 14 has been activated, thereby generating glare and glare, which affects the user's line of sight.
  • the lens module can be used as a general camera module and can be used as a face camera or a video camera.
  • a third embodiment of the present invention provides a fingerprint reading method F300.
  • the third embodiment of the present invention differs from the second embodiment in that:
  • the different light rays emitted by the unit 14 have different display effects in the environment of different light sources, and then the signal processing module 3 determines whether the acquired finger fingerprint is a fingerprint of the fake finger.
  • step S300 it is detected whether an object is located within the reading range.
  • an active detecting type component such as a general infrared scanning, an ultrasonic detector or a radar may be used to determine whether the object is located in the reading range.
  • step S302 it is determined whether the attribute of the object is a finger, wherein the attribute of the determined object can be determined by reading whether the object is in the correct finger shape, the correct finger color, or the finger occupies a predetermined available area. For example, it may be determined that the object occupies 1/3 or 1/2 of the area of the image captured by the entire image acquisition unit 12, and then determines whether it is the correct finger shape or the finger color.
  • the illumination unit 14 is activated to focus the illumination light on the finger fingerprint, and the illumination unit 14 is irradiated on the finger to form a strong contrast between the fingerprint on the finger and the background.
  • the light source of the illumination unit can be white light, infrared light, ultraviolet light or other monochromatic light source.
  • the light emitted by the illumination unit for the first time illumination is white light, so that the fingerprint of the finger is in a white light environment.
  • the image acquiring unit 12 and the liquid lens unit 13 are activated, and the liquid lens unit 13 modulates the scanning operation of the finger fingerprint from the far side to the near focus.
  • the image acquisition unit 12 continuously acquires a plurality of finger fingerprint image photos from the far-to-near modulation focus distance by the liquid lens unit 13, and transmits the acquired plurality of consecutive photos to the signal processing module 3.
  • liquid The state lens unit 13 modulates the focusing distance from far to near, and the distance between the finger fingerprint scanning is between 10 cm and 1 cm, the most preferred scanning range is 5 cm to 2 cm, and the scanning time for finger fingerprint scanning is less than 0.5 second. More preferably, the scan time is less than 0.3 seconds.
  • the image acquisition unit 12 acquires 3 to 10 finger fingerprint image photos by the liquid lens unit 13, and more preferably takes 4 to 6 images, and transmits the acquired finger fingerprint image to the signal processing module 3.
  • the liquid lens unit 13 modulates the focusing movement of the finger fingerprint from far to near.
  • the image acquisition unit 12 continuously acquires a plurality of finger fingerprint image photos from the far-to-near modulation focus distance by the liquid lens unit 13, and transmits the acquired multiple consecutive photos to the signal processing module 3, and closes the image.
  • step S314 a plurality of consecutive photos transmitted to the signal processing module 3 are acquired by the first illumination and the second illumination, and each of the consecutive photos acquired from the image acquisition unit 12 is selected to be in focus.
  • the photo, then the image with the correct focus is image processed, first detecting the position of the finger in the photo, then removing the background other than the finger, and strengthening the contrast, doing negative film processing, clearing noise and the like.
  • steps S316 and S318 the photo format with the correct focus is converted into a standard fingerprint picture, and the photo processing module 3 compares the photos obtained by the first illumination and the second illumination to determine whether the finger is a true finger or Fake fingers.
  • the fingerprint reading method F300 provided by the third embodiment of the present invention can firstly determine whether an object is located in the reading range by the detecting step, and then determine the manner in which the object is a finger and then activate the lighting unit 14, thereby avoiding the cause.
  • the finger is not placed in the reading range, and the illumination unit 14 has been activated, thereby generating glare and glare, which affects the user's line of sight.
  • the signal processing module 3 compares the photos of the different light sources emitted by the first illumination and the second illumination of the illumination unit 14 to determine whether the detected finger is a real finger or a fake finger, so that the interpretation result is more accurate.
  • the lens module 1 can be used as a general camera module, and can be used as a face camera or a video camera.

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Abstract

本发明披露一种手指指纹读取系统及指纹读取方法，手指指纹读取系统包含镜头模块、控制模块以及信号处理模块。镜头模块具有检测单元、图像获取单元、液态透镜单元以及照明单元。控制模块电性连接于镜头模块，以控制镜头模块内部元件。当检测单元检测到启动信号时，控制模块启动图像获取单元、液态透镜单元以及照明单元，液态透镜单元调制对焦距离从远到近进行手指指纹扫描，图像获取单元通过液态透镜单元从远到近的调制对焦距离过程而连续获取多张手指指纹图像照片，信号处理模块从图像获取单元所获取的手指指纹图像照片中选择一张对焦正确的照片，并将该对焦正确的照片转换成指纹图片。

Description

手指指纹读取系统及指纹读取方法 技术领域
本发明涉及一种指纹读取系统及方法，尤指一种非接触式的手指指纹读取系统(FINGERPRINT READING SYSTEM)及指纹读取方法。
背景技术
个人用的电子产品如电脑或是手机等，其通常都含有个人数据储存于内部。通常为了避免其他人取得个人的数据，其会设置一道密码锁，使用时需要输入预先设定的密码才能进入使用电子产品。然而此种输入密码的方法还是很容易因为他人通过其他方式取得密码，使个人数据被他人取得。
因此，另有开发通过指纹辨识功能辨别使用者的接触式的指纹读取器，其通过手指指纹凸起与三棱镜镜面上的接触破坏全反射的条件，因而可以得到明暗的手指指纹照片。然而此种接触式的指纹读取器因为三棱镜的成本高并且体积大，且三棱镜的镜面由于与手指接触因此需要特殊表面处理并免刮痕或腐蚀破坏玻璃表面，且手指上面的脏污或是指纹会残留在三棱镜表面上造成后续辨识困难而需要清洁。另外接触式的指纹读取器也无法辨别假指纹。
此外，虽然也有非接触式的指纹读取器，然而传统的非接触式的指纹读取器通常为了得到清晰的手指指纹照片，照机镜头需要采用微距镜镜头，并且拍摄距离要够近以取得足够大放大倍率而有清楚的手指指纹照片，而这就代表其照片的景深很浅，其必须具有明确的手指承托机构件以固定手指位置或者是需要昂贵的高阶微距镜以得到近距离深景深的光学效果。
综上所述，本发明人有感上述缺陷可改善，乃特潜心研究并配合学理的应用，终于提出一种设计合理且有效改善上述缺陷的发明。
发明内容
鉴于以上的问题，本发明提供一种手指指纹读取系统及指纹读取方法，通过非接触式手指指纹读取系统及方法可以避免前述先前技术所产生的问题。
为了达到上述的目的，本发明的其中一实施例提供一种手指指纹读取系统，其包含：一镜头模块、一控制模块以及一信号处理模块。该镜头模块具有一检测单元、一 图像获取单元、一液态透镜单元以及一照明单元。该控制模块电性连接于该镜头模块，以控制该图像获取单元、该液态透镜单元以及该照明单元。其中，当该检测单元检测到一启动信号时，该控制模块启动该图像获取单元、该液态透镜单元以及该照明单元，该液态透镜单元调制对焦距离从远到近进行手指指纹扫描，该图像获取单元通过该液态透镜单元从远到近的调制对焦距离过程而连续获取多张手指指纹图像照片，该信号处理模块从该图像获取单元所获取的这些手指指纹图像照片中选择其中一张对焦正确的照片，并将该对焦正确的照片转换成指纹图片。
本发明的其中另一实施例提供一种指纹读取方法，包括下列步骤：检测一物件位于读取范围内；判断该物件的属性；启动一照明单元；启动一图像获取单元及一液态透镜单元；调制扫描该液态透镜单元从远到近的对焦距离；获取多张该液态透镜单元从远到近的连续照片；关闭该图像获取单元、该液态透镜单元以及该照明单元；选择一张从图像获取单元所获取的连续照片中的对焦正确的照片；以及转换该一张从图像获取单元所获取的连续照片中的对焦正确的照片为图片。
本发明的其中另一实施例提供一种指纹读取方法，包括下列步骤：检测一物件位于读取范围内；判断该物件的属性；启动一照明单元，其中照明单元为第一次照明；启动一图像获取单元及一液态透镜单元；调制扫描该液态透镜单元从远到近的对焦距离；获取多张该液态透镜单元从远到近的连续照片；照明单元第二次照明；调制扫描该液态透镜单元从远到近的对焦距离；获取多张该液态透镜单元从远到近的连续照片；关闭该图像获取单元、该液态透镜单元以及该照明单元；选择一张从图像获取单元所获取的连续照片中对焦正确的照片；以及转换该一张从图像获取单元所获取的连续照片中对焦正确的照片为图片。
本发明的有益效果可以在于，本发明实施例所提供的手指指纹读取系统及方法，其可通过镜头模块、控制模块以及信号处理模块的组成，以使得本发明的手指指纹读取系统具有自动启动的机制且可以消除因手指移动造成的辨识错误的问题。
为使能更进一步了解本发明的特征及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明，并非用来对本发明加以限制。
附图说明
图1为本发明第一实施例的手指指纹读取系统方框示意图。
图2为对焦面扫描原理的示意图。
图3为本发明第二实施例的指纹读取方法步骤示意图。
图4为本发明第三实施例的指纹读取方法步骤示意图。
符号说明
手指指纹读取系统 F
镜头模块         1
检测单元         11
图像获取单元     12
液态透镜单元     13
照明单元         14
控制模块         2
信号处理模块     3
景深1            R1
景深2            R2
景深3            R3
景深4            R4
具体实施方式
〔第一实施例〕
请参阅图1所示，本发明第一实施例提供一种手指指纹读取系统F，其包含一镜头模块1、一控制模块2以及一信号处理模块3，其中镜头模块1、控制模块2以及信号处理模块3彼此电性连接。
首先，如图1所示，镜头模块1具有一检测单元11、一图像获取单元12、一液态透镜单元13以及一照明单元14。控制模块2控制图像获取单元12、液态透镜单元13以及照明单元14。其中，当该检测单元11检测到启动信号时，控制模块2将启动图 像获取单元12、液态透镜单元13以及照明单元14。举例而言，启动信号可以是检测单元11检测到正确的手指形状、正确的手指颜色或手指占据一预定可获取面积，例如手指占据整个图像获取单元12所拍摄图像的1/3或1/2面积，也或是可以通过主动检测型元件，如一般的红外线扫描、超音波检测器或雷达等，以检测手指位置，然而本发明不以此举例为限。其通过检测单元11的检测，可以使手指指纹读取系统F具有自动启动的机制。
当启动图像获取单元12、液态透镜单元13以及照明单元14之后，通过照明单元14照射在手指上，可以使手指上的指纹与背景形成强烈的明暗对比。举例而言，照明单元14的光源可以是白光、红外线、紫外线或其他单色光源。
同时，液态透镜单元13调制对焦距离从远到近进行手指指纹扫描动作。而图像获取单元12通过该液态透镜单元13从远到近的调制对焦距离过程中连续获取多张手指指纹图像照片，并将所获取到的多张连续照片传送至信号处理模块3。请同时参阅图2所示，图2为对焦面扫描原理的示意图，图中的短垂直线代表对焦面，而上面的水平直线代表景深。一般而言，对焦面越靠近图像获取单元12其景深越浅。而为解决近距离摄影对焦困难的问题，且使用者可以不用固定其手指于特定位置，本发明采用液态透镜单元13对焦面扫描的机制，从远到近连续取得不同对焦面的照片，通过恰当的液态透镜单元13的调制量设计，使连续的照片可以涵盖所设定的拍摄距离。
举例而言，图2中景深1的R1为对焦距离为2厘米时的景深，景深2的R2为对焦距离为2.5厘米时的景深，景深3的R3为对焦距离为3.5厘米时的景深，景深4的R4为对焦距离为5厘米时的景深。液态透镜单元13调制对焦距离从远到近，进行手指指纹扫描的距离为10厘米到1厘米之间，最优选的扫描范围为距离5厘米到2厘米，进行手指指纹扫描的扫描时间小于0.5秒，更优选的为扫描时间小于0.3秒。图像获取单元12通过该液态透镜单元13获取3到10张手指指纹图像照片，更优选的取像张数为4到6张，并将所获取到的手指指纹图像照片传送到信号处理模块3。在所获取的照片中，必定有一张是对焦正确的照片，且由于液态透镜单元13的对焦面调整时间快速(在<10ms等级)，完成整个扫描距离的时间不大于0.5秒，进而可以消除手指因晃动所造成的照片模糊问题。藉此本发明的手指指纹读取系统可以对手指位置的要求放宽至10厘米到1厘米的限制，并且放宽使用者摆放其手指位置的自由。
接着信号处理模块3从图像获取单元12所获取的这些手指指纹图像照片中选择其中一张对焦正确的照片，然后将此张对焦正确的照片作图像处理，首先检测手指在照片中的位置，再去除手指以外的背景，并强化对比，作负片处理、清除噪声等工作，最后转化照片格式为标准指纹图片后送入指纹辨识软件作指纹比对。举例而言，信号 处理模块3可以是电脑，使图像判断以及图像处理交由电脑执行运算。此外，信号处理模块3及控制模块2可以是嵌入式系统，其功能类似电脑，可以完成手指指纹辨识工作。
本发明第一实施例所提供的手指指纹读取系统F，可通过检测单元11通过先判断是否检测到有手指位于手指指纹读取系统F读取范围内，再启动照明单元14的方式，可以避免因手指未置放于手指指纹读取系统F读取范围内，而照明单元14就已经启动，进而产生刺眼强光，影响到使用者的视线的问题。而当手指指纹读取系统F未检测到启动信号时，镜头模块1可以作为一般的相机模块，可用来作为脸部摄影机或是视频摄影机的用途。
〔第二实施例〕
请参阅图3所示，本发明第二实施例提供一种指纹读取方法F200，包括下列步骤。如步骤S200所示，检测一物件是否位于读取范围内，例如可以通过主动检测型元件，如一般的红外线扫描、超音波检测器或雷达等，判读物件是否位于读取范围当中。再如步骤S202所示，接着判断物件的属性是否为手指，其中该判断物件的属性可以通过判读物件是否为正确的手指形状、正确的手指颜色或是手指占据了一预定可获取面积等方式。举例而言，可以先判断物件占据了整个图像获取单元12所拍摄图像的1/3或1/2面积，接着判断是否为正确的手指形状或是手指颜色。
如步骤S204所示，若物件判读为手指，即启动照明单元14，使照明光线聚焦于手指指纹上，通过照明单元14照射在手指上，可以使手指上的指纹与背景形成强烈的明暗对比。举例而言，照明单元的光源可以是白光、红外线、紫外线或其他单色光源。接着如步骤S206、S208以及S210所示，启动图像获取单元12及液态透镜单元13，液态透镜单元13调制对焦距离从远到近进行手指指纹的扫描动作。而图像获取单元12通过该液态透镜单元13从远到近的调制对焦距离过程中连续获取多张手指指纹图像照片，并将所获取到的多张连续照片传送至信号处理模块3。举例而言，液态透镜单元13调制对焦距离从远到近，进行手指指纹扫描的距离为10厘米到1厘米之间，最优选的扫描范围为距离5厘米到2厘米，进行手指指纹扫描的扫描时间小于0.5秒，更优选的为扫描时间小于0.3秒。图像获取单元12通过该液态透镜单元13获取3到10张手指指纹图像照片，更优选的取像张数为4到6张，并将所获取到的手指指纹图像照片传送到信号处理模块3。在所获取的照片中，必定有一张是对焦正确的照片，且由于液态透镜单元13的对焦面调整时间快速(在<10ms等级)，完成整个扫描距离的时间不大于0.5秒，进而可以消除手指因晃动所造成的照片模糊问题。
接着，如步骤S212及S214所示，完成截取后即关闭图像获取单元、液态透镜单元以及照明单元，并通过信号处理模块3选择一张从图像获取单元所获取的连续照片中对焦正确的照片，然后将此张对焦正确的照片作图像处理，首先检测手指在照片中的位置，再去除手指以外的背景，并强化对比，作负片处理、清除噪声等工作，最后如步骤S216所示，转换此张对焦正确的照片格式为标准指纹图片后送入指纹辨识软件作指纹比对。
本发明第二实施例所提供的指纹读取方法F200可通过检测步骤先判断是否检测到有物件位于读取范围内，紧接着判断该物件为手指后再启动照明单元14的方式，可以避免因手指未置放于读取范围内，而照明单元14就已经启动，进而产生刺眼强光，影响到使用者的视线的问题。而当尚未检测到启动信号时，镜头模块可以作为一般的相机模块，可用来作为脸部摄影机或是视频摄影机的用途。
〔第三实施例〕
请参阅图4所示，本发明第三实施例提供一种指纹读取方法F300，由图4与图3的比较可知，本发明第三实施例与第二实施例最大的差别在于：通过照明单元14所射出的不同光线，使手指在不同光源的环境下，有不同的显示效果，再经由信号处理模块3判断所获取出的手指指纹是否为假手指的指纹。
首先，如步骤S300所示，检测一物件是否位于读取范围内，例如可以通过主动检测型元件，如一般的红外线扫描、超音波检测器或雷达等，判读物件是否位于读取范围当中。接着如步骤S302所示，判断物件的属性是否为手指，其中该判断物件的属性可以通过判读物件是否为正确的手指形状、正确的手指颜色或是手指占据了一预定可获取面积等方式。举例而言，可以先判断物件占据了整个图像获取单元12所拍摄图像的1/3或1/2面积，接着判断是否为正确的手指形状或是手指颜色。
如步骤S304所示，若物件判读为手指，即启动照明单元14，使照明光线聚焦于手指指纹上，通过照明单元14照射在手指上，可以使手指上的指纹与背景形成强烈的明暗对比。举例而言，照明单元的光源可以是白光、红外线、紫外线或其他单色光源。以本发明第三实施例而言，为了辨别是否为真手指或假手指，照明单元第一次照明射出的光线为白光，使手指指纹处于白光的环境下。
接着如步骤S3061、S3081以及S3101所示，启动图像获取单元12及液态透镜单元13，液态透镜单元13调制对焦距离从远到近进行手指指纹的扫描动作。而图像获取单元12通过该液态透镜单元13从远到近的调制对焦距离过程中连续获取多张手指指纹图像照片，并将所获取到的多张连续照片传送至信号处理模块3。举例而言，液 态透镜单元13调制对焦距离从远到近，进行手指指纹扫描的距离为10厘米到1厘米之间，最优选的扫描范围为距离5厘米到2厘米，进行手指指纹扫描的扫描时间小于0.5秒，更优选的为扫描时间小于0.3秒。图像获取单元12通过该液态透镜单元13获取3到10张手指指纹图像照片，更优选的取像张数为4到6张，并将所获取到的手指指纹图像照片传送到信号处理模块3。
接着，如步骤S3062、S3082、S3102以及S312所示，当将第一次照明所获取的手指指纹图像照片传送到信号处理模块3后，照明单元第二次照明射出的光线为红光、近红外光或是其他单色光源，此时液态透镜单元13调制对焦距离从远到近进行手指指纹的扫描动作。而图像获取单元12通过该液态透镜单元13从远到近的调制对焦距离过程中连续获取多张手指指纹图像照片，并将所获取到的多张连续照片传送至信号处理模块3，并关闭图像获取单元12、液态透镜单元13以及照明单元14。
然后如步骤S314所示，通过第一次照明及第二次照明所获取传送到信号处理模块3内的多张连续照片，各自选择一张从图像获取单元12所获取的连续照片中对焦正确的照片，然后将此张对焦正确的照片作图像处理，首先检测手指在照片中的位置，再去除手指以外的背景，并强化对比，作负片处理、清除噪声等工作。最后如步骤S316及S318所示，转换此张对焦正确的照片格式为标准指纹图片，并通过信号处理模块3比对第一次照明与第二次照明所获取的照片，判断手指为真手指或假手指。
本发明第三实施例所提供的指纹读取方法F300可通过检测步骤先判断是否检测到有物件位于读取范围内，紧接着判断该物件为手指后再启动照明单元14的方式，可以避免因手指未置放于读取范围内，而照明单元14就已经启动，进而产生刺眼强光，影响到使用者的视线的问题。且通过信号处理模块3比对获取照明单元14第一次照明与第二次照明所发出不同光源的照片，判别所检测到的手指为真手指或假手指的方式，可以使判读结果更为精确。而当尚未检测到启动信号时，镜头模块1可以作为一般的相机模块，可用来作为脸部摄影机或是视频摄影机的用途。
以上所述仅为本发明的优选可行实施例，非因此局限本发明的专利范围，因此凡是运用本发明说明书及附图内容所做的等效技术变化，均包含于本发明的保护范围内。

Claims (10)

  1. 一种手指指纹读取系统，其特征在于，所述手指指纹读取系统包含：
    一镜头模块，所述镜头模块具有一检测单元、一图像获取单元、一液态透镜单元以及一照明单元；
    一控制模块，所述控制模块电性连接于所述镜头模块，以控制所述图像获取单元、所述液态透镜单元以及所述照明单元；以及
    一信号处理模块；
    其中，当所述检测单元检测到一启动信号时，所述控制模块启动所述图像获取单元、所述液态透镜单元以及所述照明单元，所述液态透镜单元调制对焦距离从远到近进行手指指纹扫描，所述图像获取单元通过所述液态透镜单元从远到近的调制对焦距离过程而连续获取多张手指指纹图像照片，所述信号处理模块从所述图像获取单元所获取的所述手指指纹图像照片中选择其中一张对焦正确的照片，并将所述对焦正确的照片转换成指纹图片。
  2. 根据权利要求1所述的手指指纹读取系统，其特征在于，当所述检测单元尚未检测到所述启动信号时，所述镜头模块作为摄影机使用。
  3. 根据权利要求1所述的手指指纹读取系统，其特征在于，所述液态透镜单元调制对焦距离从远到近进行手指指纹扫描的距离为10厘米到1厘米之间，进行手指指纹扫描的扫描时间小于0.5秒，所述图像获取单元通过所述液态透镜单元获取3到10张所述手指指纹图像照片。
  4. 根据权利要求1所述的手指指纹读取系统，其特征在于，所述启动信号为所述检测单元检测到的正确的手指形状、正确的手指颜色或手指占据的一预定的能获取面积。
  5. 根据权利要求1所述的手指指纹读取系统，其特征在于，所述手指指纹读取系统还进一步包含：一指示灯，当所述检测单元检测到所述启动信号时，启动所述指示灯。
  6. 根据权利要求1所述的手指指纹读取系统，其特征在于，当完成连续获取多张所述手指指纹图像照片时，关闭所述图像获取单元、所述液态透镜单元以及所述照明单元。
  7. 一种指纹读取方法，其特征在于，所述指纹读取方法包括下列步骤：
    检测位于读取范围内的一物件；
    判断所述物件的属性；
    启动一照明单元；
    启动一图像获取单元及一液态透镜单元；
    调制扫描所述液态透镜单元从远到近的对焦距离；
    获取多张所述液态透镜单元从远到近的连续照片；
    关闭所述图像获取单元、所述液态透镜单元以及所述照明单元；
    选择一张从所述图像获取单元所获取的连续照片中的对焦正确的照片；以及
    将从所述图像获取单元所获取的连续照片中的对焦正确的照片转换为指纹图片。
  8. 根据权利要求7所述的指纹读取方法，其特征在于，所述液态透镜单元调制对焦距离从远到近进行手指指纹扫描的距离为10厘米到1厘米之间，进行手指指纹扫描的扫描时间小于0.5秒。
  9. 根据权利要求7所述的指纹读取方法，其特征在于，判断所述物件的属性步骤包括：通过正确的手指形状判断、正确的手指颜色判断或手指占据的一预定的能获取面积判断。
  10. 根据权利要求7所述的指纹读取方法，其特征在于，启动所述照明单元步骤还进一步包括：先以白光作为第一次照明光，并接续进行启动所述图像获取单元及所述液态透镜单元的步骤至获取多张所述液态透镜单元从远到近的连续照片的步骤，然后，再以红光或近红外光作为所述照明单元的第二次照明光，并进行启动所述图像获取单元及所述液态透镜单元的步骤至将从所述图像获取单元所获取的连续照片中对焦正确的照片转换为图片的步骤，然后，再通过一信号处理模块分析第一次照明所获取的照片图片与第二次照明所获取的照片图片。
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