CN111709330B - Optical detection system and electronic equipment - Google Patents
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Abstract
Description
技术领域Technical field
本申请涉及光电技术领域,尤其涉及一种利用光学成像原理对外部对象进行检测的光学检测系统及电子设备。The present application relates to the field of optoelectronic technology, and in particular to an optical detection system and electronic equipment that utilize optical imaging principles to detect external objects.
背景技术Background technique
目前,手机、平板电脑等电子产品的光学指纹识别功能通常是通过识别用户手指按压屏幕表面时获取的指纹平面图像来实现的,比较容易被不法分子利用造价低廉的平面假指纹道具攻破,比如:将印有指纹图案的胶带或图片等贴在屏幕表面的指纹识别区域。由此,现有电子产品的光学指纹识别功能具有较明显的安全隐患。At present, the optical fingerprint recognition function of electronic products such as mobile phones and tablet computers is usually realized by identifying the flat fingerprint image obtained when the user's finger presses the surface of the screen. It is relatively easy for criminals to break through low-cost flat fake fingerprint props, such as: Attach the tape or picture printed with the fingerprint pattern to the fingerprint recognition area on the screen surface. Therefore, the optical fingerprint recognition function of existing electronic products has obvious security risks.
发明内容Contents of the invention
有鉴于此,本发明提供一种能够改善现有技术问题的光学检测系统及电子设备。In view of this, the present invention provides an optical detection system and electronic equipment that can improve the problems of the existing technology.
本申请的一个方面提供一种光学检测系统,用于对一外部对象进行检测,其特征在于,包括:One aspect of the present application provides an optical detection system for detecting an external object, which is characterized by including:
第一透镜,具有第一视场范围,用于对所述第一视场范围内的外部对象成像;A first lens having a first field of view range and used for imaging external objects within the first field of view range;
第二透镜,具有第二视场范围,用于对所述第二视场范围内的外部对象成像,所述第一视场范围与第二视场范围至少部分重叠,定义所述第一视场范围与第二视场范围相互重叠的部分为重叠视场范围;The second lens has a second field of view range and is used for imaging external objects within the second field of view range. The first field of view range and the second field of view range at least partially overlap, defining the first field of view range. The overlapping portion of the field range and the second field of view range is the overlapping field of view range;
图像传感器,位于所述第一透镜和第二透镜的下方,所述图像传感器包括多个第一感光单元和多个第二感光单元,所述第一感光单元用于接收经所述第一透镜会聚的成像光线并转换为相应的电信号,所述第二感光单元用于接收经所述第二透镜会聚成像的光线并转换为相应的电信号;An image sensor is located below the first lens and the second lens. The image sensor includes a plurality of first photosensitive units and a plurality of second photosensitive units. The first photosensitive units are used to receive images through the first lens. The concentrated imaging light is converted into a corresponding electrical signal, and the second photosensitive unit is used to receive the light condensed and imaged by the second lens and converted into a corresponding electrical signal;
处理模块,用于比较重叠视场范围内的外部对象分别经所述第一透镜所成的第一图像与经所述第二透镜所成的第二图像之间的差异,并当所述差异大于或等于预设阈值时判断所述外部对象为立体物体。A processing module for comparing the difference between the first image formed by the first lens and the second image formed by the second lens of the external object within the overlapping field of view, and when the difference is When it is greater than or equal to the preset threshold, it is determined that the external object is a three-dimensional object.
在某些实施例中,还包括镜头模块,所述镜头模块位于所述显示屏的下方,所述镜头模块包括呈阵列排布的多个小透镜,所述第一透镜和第二透镜分别为所述多个小透镜中的其中的一个。In some embodiments, a lens module is further included. The lens module is located below the display screen. The lens module includes a plurality of small lenses arranged in an array. The first lens and the second lens are respectively One of the plurality of small lenses.
在某些实施例中,所述外部对象包括第一特征点和第二特征点,所述第一特征点和第二特征点在所述第一图像上对应的像点之间的距离为第一间距,所述第一特征点和第二特征点在所述第二图像上对应的像点之间的距离为第二间距,所述第一图像与第二图像之间的差异为所述第一间距与第二间距的差值,所述预设阈值为所述第一间距与第二间距的差值的阈值。In some embodiments, the external object includes a first feature point and a second feature point, and the distance between the corresponding image points of the first feature point and the second feature point on the first image is A distance, the distance between the corresponding image points of the first feature point and the second feature point on the second image is the second distance, and the difference between the first image and the second image is the The difference between the first spacing and the second spacing, the preset threshold is the threshold of the difference between the first spacing and the second spacing.
在某些实施例中,所述外部对象包括第一特征点和第二特征点,所述第一特征点和第二特征点在所述第一图像上对应的像点的灰度值之差为第一灰度差,所述第一特征点和第二特征点在所述第二图像上对应的像点的灰度值之差为第二灰度差,所述第一图像与第二图像之间的差异为所述第一灰度差与第二灰度差的差值,所述预设阈值为所述第一灰度差与第二灰度差的差值的阈值。In some embodiments, the external object includes a first feature point and a second feature point, and the difference between the grayscale values of the corresponding image points of the first feature point and the second feature point on the first image is is the first grayscale difference. The difference between the grayscale values of the corresponding image points of the first feature point and the second feature point on the second image is the second grayscale difference. The first image and the second grayscale difference are The difference between the images is the difference between the first grayscale difference and the second grayscale difference, and the preset threshold is the threshold of the difference between the first grayscale difference and the second grayscale difference.
在某些实施例中,所述外部对象为用户手指位于所述重叠视场范围内的部分指纹纹路,所述第一特征点为指纹脊部,所述第二特征点为指纹谷部。In some embodiments, the external object is a part of the fingerprint pattern of the user's finger located within the overlapping field of view, the first feature point is a fingerprint ridge, and the second feature point is a fingerprint valley.
在某些实施例中,所述第一特征点和第二特征点分别在第一图像和第二图像上所成的像点的间距取值范围为100μm至300μm。In some embodiments, the distance between the image points formed by the first feature point and the second feature point on the first image and the second image respectively ranges from 100 μm to 300 μm.
在某些实施例中,所述第一视场范围和第二视场范围中所述重叠视场范围所占的比例大于或等于30%。In some embodiments, the proportion of the overlapping field of view range in the first field of view range and the second field of view range is greater than or equal to 30%.
在某些实施例中,所述显示屏为主动发光式显示屏,所述显示屏发出的光线可用于照射外部对象以形成所述第一图像和/或第二图像;或者In some embodiments, the display screen is an active light-emitting display screen, and the light emitted by the display screen can be used to illuminate external objects to form the first image and/or the second image; or
所述显示屏为被动发光式显示模组,所述屏下光学检测系统还包括一激励光源,用于提供检测所需的光线。The display screen is a passive light-emitting display module, and the under-screen optical detection system also includes an excitation light source for providing light required for detection.
在某些实施例中,所述处理模块还用于将所述外部对象的第一图像和/或第二图像与预存的外部对象模板进行比对,并根据比对结果识别所述外部对象的身份。In some embodiments, the processing module is also configured to compare the first image and/or the second image of the external object with a pre-stored external object template, and identify the external object according to the comparison result. identity.
本申请的一个方面提供一种电子设备,包括如上述实施例所提供的光学检测系统。One aspect of the present application provides an electronic device, including the optical detection system provided in the above embodiment.
本申请的有益效果在于,本申请的光学检测系统通过比较从不同视角分别获取的外部对象图像之间是否存在因视差导致的差异进而判断所述外部对象是否为立体物体,可有效防止不法分子利用印有外部对象图像的平面仿制品对所述光学检测系统的识别功能进行攻击,提高了电子设备的安全性。The beneficial effect of the present application is that the optical detection system of the present application determines whether the external object is a three-dimensional object by comparing whether there are differences due to parallax between external object images obtained from different viewing angles, which can effectively prevent criminals from taking advantage of Flat imitations printed with images of external objects attack the recognition function of the optical detection system and improve the security of electronic equipment.
附图说明Description of the drawings
图1是本申请实施例所提供的屏下光学检测系统应用于电子设备上的结构示意图;Figure 1 is a schematic structural diagram of an under-screen optical detection system provided by an embodiment of the present application applied to an electronic device;
图2是本申请第一实施例的光学检测系统的立体结构图;Figure 2 is a three-dimensional structural view of the optical detection system according to the first embodiment of the present application;
图3是图2所示的光学检测系统沿III-III线的部分截面示意图;Figure 3 is a partial cross-sectional schematic diagram of the optical detection system shown in Figure 2 along line III-III;
图4是图3中所述第一透镜和第二透镜的成像光路图;Figure 4 is an imaging optical path diagram of the first lens and the second lens described in Figure 3;
图5是本申请第一实施例的光学检测系统的功能模块示意图;Figure 5 is a schematic diagram of the functional modules of the optical detection system according to the first embodiment of the present application;
图6是本申请第二实施例的光学检测系统的部分截面示意图;Figure 6 is a partial cross-sectional schematic diagram of the optical detection system according to the second embodiment of the present application;
具体实施例Specific embodiments
在对本申请实施例的具体描述中,应当理解,当基板、片、层或图案被称为在另一个基板、另一个片、另一个层或另一个图案“上”或“下”时,它可以“直接地”或“间接地”在另一个基板、另一个片、另一个层或另一个图案上,或者还可以存在一个或多个中间层。为了清楚的目的,可以夸大、省略或者示意性地表示说明书附图中的每一个层的厚度和大小。此外,附图中元件的大小并非完全反映实际大小。In the detailed description of the embodiments of the present application, it should be understood that when a substrate, sheet, layer or pattern is referred to as being "on" or "under" another substrate, another sheet, another layer or another pattern, it It may be "directly" or "indirectly" on another substrate, another sheet, another layer or another pattern, or one or more intermediate layers may also be present. For purposes of clarity, the thickness and size of each layer in the drawings of this specification may be exaggerated, omitted, or schematically represented. In addition, the sizes of components in the drawings do not entirely reflect actual sizes.
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.
下文的公开提供了许多不同的实施例或例子用来实现本申请的不同结构。为了简化本申请的公开,下文中对特定例子的部件和设定进行描述。当然,它们仅仅为示例,并且目的不在于限制本申请。此外,本申请可以在不同例子中重复参考数字和/或参考字母,这种重复是为了简化和清楚的目的,其本身不指示所讨论各种实施例和/或设定之间的关系。此外,本申请提供了的各种特定的工艺和材料的例子,但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the application. Furthermore, this application may repeat reference numbers and/or reference letters in different examples, such repetition being for the purposes of simplicity and clarity and does not by itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
进一步地,所描述的特征、结构可以以任何合适的方式结合在一个或更多实施例中。在下面的描述中,提供许多具体细节从而给出对本申请的实施例的充分理解。然而,本领域技术人员应意识到,没有所述特定细节中的一个或更多,或者采用其它的结构、组元等,也可以实践本申请的技术方案。在其它情况下,不详细示出或描述公知结构或者操作以避免模糊本申请。Further, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. However, those skilled in the art should realize that the technical solution of the present application can also be practiced without one or more of the specific details, or by adopting other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the disclosure.
请参阅图1,图1是本申请电子设备一实施例的结构示意图。所述电子设备1包括屏下光学检测系统10,用于对外部对象2进行检测。所述屏下光学检测系统10包括保护层12、显示屏14及位于显示屏14下方的光学检测系统16。所述显示屏14位于所述保护层12的下方。所述显示屏14用于显示画面。所述保护层12可透过显示屏14发出的用于显示画面的光线,并保护所述显示屏14免受损坏。所述光学检测系统16用于透过所述保护层12和显示屏14接收来自外部对象2的光线,并转换接收到的光线为相应的电信号,以执行相应的信息感测。所述光学检测系统16例如用于执行生物特征信息感测,所述生物特征信息例如但不局限于指纹信息、掌纹信息等纹路特征信息,和/或,血氧信息、心跳信息、脉搏信息等活体信息。然,本申请并不以此为局限,所述光学检测系统16还可用于执行其它信息感测,例如用于执行深度信息感测、接近感测等等。在本申请中,主要以所述外部对象2为用户手指,所述光学检测系统16执行指纹感测为例进行说明。Please refer to FIG. 1 , which is a schematic structural diagram of an embodiment of the electronic device of the present application. The electronic device 1 includes an under-screen optical detection system 10 for detecting external objects 2 . The under-screen optical detection system 10 includes a protective layer 12 , a display screen 14 and an optical detection system 16 located below the display screen 14 . The display screen 14 is located below the protective layer 12 . The display screen 14 is used to display images. The protective layer 12 can transmit the light emitted by the display screen 14 for displaying images and protect the display screen 14 from damage. The optical detection system 16 is used to receive light from the external object 2 through the protective layer 12 and the display screen 14, and convert the received light into corresponding electrical signals to perform corresponding information sensing. The optical detection system 16 is, for example, used to perform sensing of biometric information, such as but not limited to fingerprint information, palmprint information and other texture feature information, and/or blood oxygen information, heartbeat information, and pulse information. and other living body information. However, the present application is not limited to this, and the optical detection system 16 can also be used to perform other information sensing, such as depth information sensing, proximity sensing, and so on. In this application, the external object 2 is a user's finger and the optical detection system 16 performs fingerprint sensing as an example for explanation.
所述电子设备1例如但不限于消费性电子产品、家居式电子产品、车载式电子产品、金融终端产品等合适类型的电子产品。其中,消费性电子产品例如为手机、平板电脑、笔记本电脑、桌面显示器、电脑一体机等。家居式电子产品例如为智能门锁、电视、冰箱等。车载式电子产品例如为车载导航仪、车载触控交互装置等。金融终端产品例如为ATM机、自助办理业务的终端等。The electronic device 1 is, for example, but not limited to suitable types of electronic products such as consumer electronic products, household electronic products, vehicle-mounted electronic products, financial terminal products, etc. Among them, consumer electronic products include mobile phones, tablet computers, notebook computers, desktop monitors, all-in-one computers, etc. Home electronic products include smart door locks, TVs, refrigerators, etc. Vehicle-mounted electronic products include vehicle navigation systems, vehicle-mounted touch interactive devices, and the like. Financial terminal products include ATM machines, self-service terminals, etc.
需要提前说明的是,在本申请中,所述光学检测系统16具有多个不同的实施例,为了清楚起见,对不同实施例中的光学检测系统16分别用了不同的标号16a、16b标示以进行区分。进一步地,为了描述方便,所述光学检测系统16的不同实施例中的相同标号可以表示相同的元件,也可以表示进行变更、替换、扩展、组合的相似元件。It should be noted in advance that in this application, the optical detection system 16 has multiple different embodiments. For the sake of clarity, the optical detection systems 16 in different embodiments are labeled with different numbers 16a and 16b respectively. Make a distinction. Furthermore, for the convenience of description, the same reference numerals in different embodiments of the optical detection system 16 may represent the same components, or may represent similar components that have been modified, replaced, expanded, or combined.
可选地,在一些实施例中,所述显示屏14可以为主动发光式显示屏,例如但不局限为有机发光二极管显示屏(OLED显示屏)等。所述显示屏14可作为激励光源,提供用于检测的光线,例如但不限于波长范围在400至780纳米(nm)之间的可见光。或者,在另一些实施例中,所述显示屏14也可以为被动发光式显示屏,例如但不局限为液晶显示屏(LCD屏)或电子纸显示屏等。采用被动发光式显示屏的所述电子设备1需要额外设置一激励光源来提供用于检测的光线,例如但不限于波长范围在800至1000nm之间的近红外光。然,可变更地,对于使用主动发光式显示屏的电子设备也可额外设置一激励光源来提供用于检测的光线。Optionally, in some embodiments, the display screen 14 may be an active light-emitting display screen, such as but not limited to an organic light-emitting diode display screen (OLED display screen). The display screen 14 can be used as an excitation light source to provide light for detection, such as but not limited to visible light with a wavelength range between 400 and 780 nanometers (nm). Alternatively, in other embodiments, the display screen 14 may also be a passive light-emitting display screen, such as but not limited to a liquid crystal display screen (LCD screen) or an electronic paper display screen. The electronic device 1 using a passive light-emitting display screen requires an additional excitation light source to provide light for detection, such as but not limited to near-infrared light with a wavelength range between 800 and 1000 nm. However, alternatively, an electronic device using an active light-emitting display screen may be additionally provided with an excitation light source to provide light for detection.
可选地,在一些实施例中,所述保护层12可以包括透明材料,例如但不限于为透明玻璃、透明聚合物、其他任意透明材料等。所述保护层12可以是单层结构,也可以是多层结构。所述保护层12大致为具有预定长度、宽度、厚度的薄板。可以理解的是,所述保护层12可以包括实际使用时用户贴附的塑料膜、钢化膜、或其他膜层等。所述保护层12的外表面120可以为电子设备1位于最外侧的表面。在进行检测时,所述外部对象2可以直接接触所述保护层12的外表面120。Optionally, in some embodiments, the protective layer 12 may include transparent materials, such as but not limited to transparent glass, transparent polymers, any other transparent materials, and the like. The protective layer 12 may have a single-layer structure or a multi-layer structure. The protective layer 12 is generally a thin plate with a predetermined length, width, and thickness. It can be understood that the protective layer 12 may include a plastic film, a tempered film, or other film layers attached by the user during actual use. The outer surface 120 of the protective layer 12 may be the outermost surface of the electronic device 1 . During detection, the external object 2 may directly contact the outer surface 120 of the protective layer 12 .
请一并参阅图2、图3及图5,图2为本申请第一实施例的光学检测系统16a的立体结构图。图3为图2所示的光学检测系统16a沿III-III线的部分截面示意图。图5为本申请第一实施例的光学检测系统16a的功能模块示意图。所述光学检测系统16a包括镜头模块160及设置在所述镜头模块160下方的图像传感器162。所述镜头模块160用于会聚光线至所述图像传感器162以对外部对象2进行成像。所述图像传感器162用于转换接收到的光线为相应的电信号。Please refer to Figures 2, 3 and 5 together. Figure 2 is a three-dimensional structural view of the optical detection system 16a in the first embodiment of the present application. FIG. 3 is a partial cross-sectional view of the optical detection system 16a shown in FIG. 2 along line III-III. FIG. 5 is a schematic diagram of the functional modules of the optical detection system 16a according to the first embodiment of the present application. The optical detection system 16a includes a lens module 160 and an image sensor 162 disposed below the lens module 160. The lens module 160 is used to collect light to the image sensor 162 to image the external object 2 . The image sensor 162 is used to convert the received light into corresponding electrical signals.
所述镜头模块160包括多个小透镜1600(Mini-Lens),所述多个小透镜1600设置在所述图像传感器162上方,所述多个小透镜1600彼此之间间隔排布。所述多个小透镜1600用于会聚光线至所述图像传感器162上以对外部对象2进行成像。The lens module 160 includes a plurality of small lenses 1600 (Mini-Lens). The plurality of small lenses 1600 are disposed above the image sensor 162 and are spaced apart from each other. The plurality of small lenses 1600 are used to focus light onto the image sensor 162 to image the external object 2 .
可选地,在本实施例中,所述多个小透镜1600呈规则阵列排布。进一步可选地,所述多个小透镜1600例如但不限于呈矩形阵列排布。然,可变更地,在其他实施例中,所述多个小透镜1600也可以呈非规则排布。Optionally, in this embodiment, the plurality of small lenses 1600 are arranged in a regular array. Further optionally, the plurality of small lenses 1600 may be arranged in a rectangular array, for example but not limited to. However, alternatively, in other embodiments, the plurality of small lenses 1600 may also be arranged irregularly.
可选地,在本实施例中,所述镜头模块160还包括第一基板1603,所述多个小透镜1600设置在所述第一基板1603上。所述第一基板1603由透明材料制成,所述透明材料例如但不限于为透明丙烯酸树脂、透镜玻璃、UV胶材等。所述第一基板1603可以与所述多个小透镜1600一体成型。或者,所述多个小透镜1600与所述第一基板1603为相互独立制作的元件,所述多个小透镜1600再通过粘胶等方式固定在所述第一基板1603上。Optionally, in this embodiment, the lens module 160 further includes a first substrate 1603, and the plurality of small lenses 1600 are provided on the first substrate 1603. The first substrate 1603 is made of transparent material, such as but not limited to transparent acrylic resin, lens glass, UV glue, etc. The first substrate 1603 may be integrally formed with the plurality of small lenses 1600 . Alternatively, the plurality of small lenses 1600 and the first substrate 1603 are components produced independently of each other, and the plurality of small lenses 1600 are fixed on the first substrate 1603 through adhesive or other means.
可选地,多个所述小透镜1600为凸透镜。进一步可选地,多个所述小透镜1600为球面透镜或非球面透镜。Optionally, the plurality of small lenses 1600 are convex lenses. Further optionally, the plurality of small lenses 1600 are spherical lenses or aspherical lenses.
可选地,多个所述小透镜1600由透明材料制成,所述透明材料例如但不限于为透明丙烯酸树脂、透镜玻璃、UV胶材等。Optionally, the plurality of small lenses 1600 are made of transparent materials, such as but not limited to transparent acrylic resin, lens glass, UV glue, etc.
可选地,在本实施例中,所述光学检测系统16还包括位于所述图像传感器162下方的第二基板163。所述第二基板163可以为所述图像传感器162提供支撑以及与外部电路的电连接。所述第二基板163例如为软性电路板或硬性电路板。Optionally, in this embodiment, the optical detection system 16 further includes a second substrate 163 located below the image sensor 162 . The second substrate 163 may provide support for the image sensor 162 and electrical connection with external circuitry. The second substrate 163 is, for example, a flexible circuit board or a rigid circuit board.
可选地,在本实施例中,所述光学检测系统16还包括设置在所述图像传感器162上的滤光层164。所述滤光层164透过位于预设波长范围内用于检测的光线,并滤除预设波长范围以外的其他光线。可选地,在其他的一些实施例中,所述滤光层164也可以涂敷在所述多个小透镜1600的入光表面上。Optionally, in this embodiment, the optical detection system 16 further includes a filter layer 164 disposed on the image sensor 162 . The filter layer 164 transmits light for detection within a preset wavelength range and filters out other light outside the preset wavelength range. Optionally, in some other embodiments, the filter layer 164 can also be coated on the light incident surfaces of the plurality of small lenses 1600 .
可选地,在本实施例中,所述光学检测系统16a还包括遮光层165,所述遮光层165设置在所述第一基板1603上并位于多个所述小透镜1600之间的间隔区域。所述遮光层165用于遮挡光线,以减少未经小透镜1600会聚的杂散光线照射至所述图像传感器162而对检测造成干扰。Optionally, in this embodiment, the optical detection system 16a further includes a light-shielding layer 165, which is provided on the first substrate 1603 and located in the spacing area between the plurality of small lenses 1600. . The light-shielding layer 165 is used to block light to reduce stray light that is not condensed by the small lens 1600 from irradiating the image sensor 162 and causing interference to detection.
可变更地,在其他一些实施例中,所述遮光层165可以设置在不同位置。例如,所述遮光层165设置在所述滤光层164与第一基板1603之间,所述遮光层165具有对应所述多个小透镜1600的透光孔(图未示)。或者,所述遮光层165设置在所述滤光层164与图像传感器162之间,所述遮光层165具有与所述多个小透镜1600对应的透光孔。本申请对此并不限定。Alternatively, in other embodiments, the light-shielding layer 165 may be disposed at different positions. For example, the light-shielding layer 165 is disposed between the light filter layer 164 and the first substrate 1603, and the light-shielding layer 165 has light-transmitting holes (not shown) corresponding to the plurality of small lenses 1600. Alternatively, the light-shielding layer 165 is disposed between the filter layer 164 and the image sensor 162 , and the light-shielding layer 165 has light-transmitting holes corresponding to the plurality of small lenses 1600 . This application is not limited to this.
可选地,在其他实施例中,所述光学检测系统16还可以包括设置在所述多个小透镜1600上的保护膜(图未示)。所述保护膜可以覆盖所述多个小透镜1600和/或遮光层165,以起到防潮、防尘、防刮等作用。在一些实施例中,所述保护膜也可以省略。Optionally, in other embodiments, the optical detection system 16 may also include a protective film (not shown) disposed on the plurality of small lenses 1600 . The protective film can cover the plurality of small lenses 1600 and/or the light-shielding layer 165 to prevent moisture, dust, scratches, etc. In some embodiments, the protective film can also be omitted.
所述图像传感器162包括多个感光单元1624以及与所述感光单元1624电连接的读出电路和其他辅助电路。所述感光单元1624为光探测器(photo detector)例如但不限于光电二极管等。所述感光单元1624用于接收经所述镜头模块160会聚的成像光线并转换为相应的电信号,以获得外部对象2的生物特征信息。所述外部对象2例如但不限于为用户的手指、手掌等,所述生物特征信息例如但不限于为用户手指的指纹图像数据。可选地,单个所述感光单元1624的面积大小的取值范围例如为5微米(μm)*5μm至10μm*10μm。The image sensor 162 includes a plurality of photosensitive units 1624 as well as readout circuits and other auxiliary circuits electrically connected to the photosensitive units 1624 . The photosensitive unit 1624 is a photo detector such as but not limited to a photodiode. The photosensitive unit 1624 is used to receive the imaging light collected by the lens module 160 and convert it into a corresponding electrical signal to obtain the biometric information of the external object 2 . The external object 2 is, for example, but not limited to, the user's finger, palm, etc., and the biometric information is, for example, but not limited to, the fingerprint image data of the user's finger. Optionally, the area size of a single photosensitive unit 1624 ranges from 5 microns (μm)*5 μm to 10 μm*10 μm, for example.
可选地,在本实施例中,所述多个感光单元1624呈阵列排布。然,可变更地,在某些实施例中,所述多个感光单元1624的排列也可以构成规则或不规则的二维图案。每个所述小透镜1600具有预设的视场范围(Filed Of View,FOV),每个所述小透镜1600能够将视场范围内的外部对象2成像在所述图像传感器162对应的多个感光单元1624上,进而被转换为相应的图像数据。Optionally, in this embodiment, the plurality of photosensitive units 1624 are arranged in an array. However, alternatively, in some embodiments, the arrangement of the plurality of photosensitive units 1624 may also form a regular or irregular two-dimensional pattern. Each of the small lenses 1600 has a preset field of view (Filed Of View, FOV), and each of the small lenses 1600 is capable of imaging the external objects 2 within the field of view on multiple corresponding areas of the image sensor 162 . on the photosensitive unit 1624, and then converted into corresponding image data.
为了描述方便,定义能够透过所述小透镜1600接收到光线的多个感光单元1624所在的区域为该小透镜1600的感光区域,所述多个小透镜1600中的部分或全部在所述图像传感器162上都分别有对应的感光区域。在本申请中,以每个小透镜1600在所述图像传感器162上都有对应的感光区域为例进行说明。每个所述小透镜1600能够将各自视场范围内的外部对象2成像在对应的感光区域内。可选地,在本实施例中,每个所述小透镜1600的感光区域包括多个所述感光单元1624,例如但不限于:10*10的感光单元1624的阵列,或者100*100的感光单元1624的阵列,或者10*10至100*100之间的任意尺寸的感光单元1624阵列,或者100至10000个感光单元1624。For the convenience of description, the area where the plurality of photosensitive units 1624 that can receive light through the small lens 1600 is defined as the photosensitive area of the small lens 1600. Some or all of the plurality of small lenses 1600 are in the image. Each sensor 162 has a corresponding photosensitive area. In this application, each small lens 1600 has a corresponding photosensitive area on the image sensor 162 as an example for description. Each of the small lenses 1600 can image the external object 2 within the respective field of view in the corresponding photosensitive area. Optionally, in this embodiment, the photosensitive area of each small lens 1600 includes a plurality of photosensitive units 1624, such as but not limited to: an array of 10*10 photosensitive units 1624, or a 100*100 photosensitive unit. An array of units 1624, or an array of photosensitive units 1624 of any size between 10*10 and 100*100, or 100 to 10,000 photosensitive units 1624.
可选地,在本实施例中,每一个所述小透镜1600具有相同的形状及光学参数,例如但不限于:相同的焦距、视场范围及表面曲率等。所述图像传感器162上感光单元1624的感光面大致平行于所述保护层12的外表面,所述多个小透镜1600设置在同一水平面上,所述多个小透镜1600的光心与对应感光单元1624的感光面之间的距离大致相同,所述多个小透镜1600的光心与所述保护层12的外表面120之间的距离也大致相同。因此,在本实施例中,每个所述小透镜1600与对应感光单元1624所组成的成像光路具有相同的成像参数,例如但不限于:相同的像距及放大倍率等。然,可变更地,在其他一些实施例中,多个所述小透镜1600也可以具有不同的形状及光学参数。Optionally, in this embodiment, each of the small lenses 1600 has the same shape and optical parameters, such as but not limited to: the same focal length, field of view range, surface curvature, etc. The photosensitive surface of the photosensitive unit 1624 on the image sensor 162 is substantially parallel to the outer surface of the protective layer 12 . The plurality of small lenses 1600 are disposed on the same horizontal plane. The optical centers of the multiple small lenses 1600 are aligned with the corresponding photosensitive surfaces. The distance between the photosensitive surfaces of the units 1624 is approximately the same, and the distance between the optical centers of the plurality of small lenses 1600 and the outer surface 120 of the protective layer 12 is also approximately the same. Therefore, in this embodiment, the imaging light path formed by each small lens 1600 and the corresponding photosensitive unit 1624 has the same imaging parameters, such as but not limited to: the same image distance and magnification. However, alternatively, in some other embodiments, the plurality of small lenses 1600 may also have different shapes and optical parameters.
以外部对象2为用户手指举例,在检测手指的指纹时用户将手指按压在所述保护层12外表面120上预设的检测区域,手指的指纹与所述保护层12外表面120的检测区域相接触。可以理解的是,所述检测区域位于所述多个小透镜1600的视场范围内,所述多个小透镜1600能够将与检测区域接触的指纹成像在图像传感器162与各自视场范围对应的感光区域上,并由所述感光区域内的感光单元1624转换为相应的指纹图像数据。手指的指纹包括脊部(ridge)和谷部(valley),指纹的脊部直接与保护层12表面接触,指纹的谷部与保护层12表面相隔一定的间隙。因所述脊部和谷部与保护层12表面的接触情况不同,分别来自所述脊部和谷部的成像光线到达对应感光单元1624时具有不同的光强(可认为光线的亮度不同),从而形成与脊谷纹路相应的明暗相间的指纹图像。所述指纹图像包括多个脊谷纹路的特征点信息,进一步通过与预存的指纹模板数据进行比对验证,可以用来实现指纹的检测和识别。Taking the external object 2 as the user's finger as an example, when detecting the fingerprint of the finger, the user presses the finger on the preset detection area on the outer surface 120 of the protective layer 12 , and the fingerprint of the finger is consistent with the detection area of the outer surface 120 of the protective layer 12 contact. It can be understood that the detection area is located within the field of view of the plurality of small lenses 1600, and the plurality of small lenses 1600 can image the fingerprint in contact with the detection area on the image sensor 162 corresponding to the respective field of view. on the photosensitive area, and converted into corresponding fingerprint image data by the photosensitive unit 1624 in the photosensitive area. The fingerprint of the finger includes a ridge and a valley. The ridge of the fingerprint is in direct contact with the surface of the protective layer 12 , and the valley of the fingerprint is separated from the surface of the protective layer 12 by a certain gap. Because the ridges and valleys have different contact conditions with the surface of the protective layer 12, the imaging light from the ridges and valleys respectively has different light intensities when they reach the corresponding photosensitive units 1624 (it can be considered that the brightness of the light is different). This results in a light and dark fingerprint image corresponding to the ridge and valley lines. The fingerprint image includes feature point information of multiple ridge and valley lines, which can be used to detect and identify fingerprints by further comparing and verifying it with pre-stored fingerprint template data.
定义所述多个小透镜1600的其中一个为第一透镜1601,具有对应的第一视场范围FOV1。所述图像传感器162具有与所述第一透镜1601对应的第一感光区域1621,所述第一感光区域1621内的感光单元1624定义为第一感光单元1624a。所述第一透镜1601用于对第一视场范围FOV1内的外部对象2成像,所述第一感光单元1624a接收经所述第一透镜1601会聚成像的光线并转换为相应的图像数据(比如:电信号)。所述第一透镜1601和所述第一感光单元1624a构成能够对第一视场范围FOV1内的外部对象2进行成像的第一成像模块166。One of the plurality of small lenses 1600 is defined as a first lens 1601, which has a corresponding first field of view range FOV1. The image sensor 162 has a first photosensitive area 1621 corresponding to the first lens 1601, and the photosensitive unit 1624 in the first photosensitive area 1621 is defined as a first photosensitive unit 1624a. The first lens 1601 is used to image the external object 2 within the first field of view range FOV1. The first photosensitive unit 1624a receives the light condensed and imaged by the first lens 1601 and converts it into corresponding image data (such as :electric signal). The first lens 1601 and the first photosensitive unit 1624a constitute a first imaging module 166 capable of imaging the external object 2 within the first field of view range FOV1.
定义所述多个小透镜1600的其中另一个为第二透镜1602,具有对应的第二视场范围FOV2。所述图像传感器162具有与所述第二透镜1602对应的第二感光区域1622,所述第二感光区域1622内的感光单元1624定义为第二感光单元1624b。所述第二透镜1602用于对第二视场范围FOV2内的外部对象2成像,所述第二感光单元1624b接收经所述第二透镜1602会聚成像的光线并转换为相应的图像数据(比如:电信号)。所述第二透镜1602和所述第二感光单元1624b构成能够对第二视场范围FOV2内的外部对象2进行成像的第二成像模块168。Another one of the plurality of small lenses 1600 is defined as a second lens 1602, which has a corresponding second field of view range FOV2. The image sensor 162 has a second photosensitive area 1622 corresponding to the second lens 1602, and the photosensitive unit 1624 in the second photosensitive area 1622 is defined as a second photosensitive unit 1624b. The second lens 1602 is used to image the external object 2 within the second field of view range FOV2. The second photosensitive unit 1624b receives the light condensed and imaged by the second lens 1602 and converts it into corresponding image data (such as :electric signal). The second lens 1602 and the second photosensitive unit 1624b constitute a second imaging module 168 capable of imaging the external object 2 within the second field of view range FOV2.
所述第一视场范围FOV1与第二视场范围FOV2至少部分重叠,所述第一视场范围FOV1与第二视场范围FOV2相互重叠的部分定义为重叠视场范围。所述第一成像模块166对在重叠视场范围内的外部对象2(比如:用户手指)形成第一图像,所述第二成像模块168对在重叠视场范围内的外部对象2形成第二图像。The first field of view range FOV1 and the second field of view range FOV2 at least partially overlap, and the overlapping portion of the first field of view range FOV1 and the second field of view range FOV2 is defined as an overlapping field of view range. The first imaging module 166 forms a first image for the external object 2 (such as a user's finger) within the overlapping field of view, and the second imaging module 168 forms a second image for the external object 2 within the overlapping field of view. image.
如图4所示,图4为图3中所述第一透镜和第二透镜的成像光路图。所述外部对象2包括第一特征点A和第二特征点B,所述第一特征点A在第一图像上具有对应的第一成像点A1,所述第二特征点B在第一图像上具有对应的第二成像点B2,所述第一特征点A在第二图像上具有对应的第三成像点A3,所述第二特征点B在第二图像上具有对应的第四成像点B4。As shown in FIG. 4 , FIG. 4 is an imaging optical path diagram of the first lens and the second lens in FIG. 3 . The external object 2 includes a first feature point A and a second feature point B. The first feature point A has a corresponding first imaging point A1 on the first image. The second feature point B has a corresponding first imaging point A1 on the first image. has a corresponding second imaging point B2 on the second image, the first feature point A has a corresponding third imaging point A3 on the second image, and the second feature point B has a corresponding fourth imaging point on the second image B4.
若所述外部对象2为平面物体,例如但不限于:印有指纹图案的胶带或图片等。所述平面外部对象2包括第一特征点A和第二特征点C。所述平面外部对象2放置在重叠视场范围内的检测区域上时,所述平面外部对象2上的点均与重叠视场范围内的检测区域表面相接触,所述第一成像模块166对重叠视场范围内的平面外部对象2所成的第一图像与所述第二成像模块168对重叠视场范围内的平面外部对象2所成的第二图像一致。If the external object 2 is a planar object, such as but not limited to: tape or pictures printed with fingerprint patterns, etc. The planar external object 2 includes a first feature point A and a second feature point C. When the planar external object 2 is placed on the detection area within the overlapping field of view, all points on the planar external object 2 are in contact with the surface of the detection area within the overlapping field of view, and the first imaging module 166 The first image formed by the planar external object 2 within the overlapping field of view is consistent with the second image formed by the second imaging module 168 of the planar external object 2 within the overlapping field of view.
具体而言,所述第一特征点A在第一图像上对应的第一成像点A1与所述第二特征点C在第一图像上对应的第二成像点C2之间的距离可以定义为第一间距A1C2。所述第一特征点A在第二图像上对应的第三成像点A3与所述第二特征点C在第二图像上对应的第四成像点C4之间的距离可以定义为第二间距A3C4。所述第一图像与第二图像一致指的是所述第一图像与第二图像之间不存在差异或者说差异小于预设的阈值,在图像尺寸方面体现为所述第一间距A1C2与所述第二间距A3C4相同,或者是所述第一间距A1C2与所述第二间距A3C4之间的差值小于预设的差值阈值。所述第一特征点A在第一图像上对应的第一成像点A1与所述第二特征点C在第一图像上对应的第二成像点C2之间的灰度值之差可以定义为第一灰度差。所述第一特征点A在第二图像上对应的第三成像点A3与所述第二特征点C在第二图像上对应的第四成像点C4之间的灰度值之差可以定义为第二灰度差。所述第一图像与第二图像一致在图像灰度方面体现为所述第一灰度差与所述第二灰度差相同,或者是所述第一灰度差与所述第二灰度差之间的差值小于预设的差值阈值。Specifically, the distance between the first imaging point A1 corresponding to the first feature point A on the first image and the second imaging point C2 corresponding to the second feature point C on the first image can be defined as First pitch A1C2. The distance between the third imaging point A3 corresponding to the first feature point A on the second image and the fourth imaging point C4 corresponding to the second feature point C on the second image can be defined as the second distance A3C4 . The consistency between the first image and the second image means that there is no difference between the first image and the second image or that the difference is less than a preset threshold, which is reflected in the image size as the distance between the first distance A1C2 and the second image. The second distance A3C4 is the same, or the difference between the first distance A1C2 and the second distance A3C4 is less than a preset difference threshold. The difference in gray value between the first imaging point A1 corresponding to the first feature point A on the first image and the second imaging point C2 corresponding to the second feature point C on the first image can be defined as The first grayscale difference. The difference in gray value between the third imaging point A3 corresponding to the first feature point A on the second image and the fourth imaging point C4 corresponding to the second feature point C on the second image can be defined as Second grayscale difference. The consistency between the first image and the second image in terms of image grayscale is reflected in the fact that the first grayscale difference is the same as the second grayscale difference, or the first grayscale difference is the same as the second grayscale difference. The difference between the differences is less than the preset difference threshold.
若所述外部对象2为立体物体,例如但不限于:用户的手指,立体的手指与重叠视场范围内的检测区域表面接触时,立体手指的指纹脊部与重叠视场范围内的检测区域表面接触而指纹谷部与检测区域表面之间间隔一定距离。所述第一成像模块166对重叠视场范围内的立体手指所成的第一图像与所述第二成像模块168对重叠视场范围内的立体手指所成的第二图像之间会存在因视差所导致的差异。因此,通过分析经不同视角获取的同一个外部对象2的图像之间是否存在差异可以判断出所述外部对象2是否为立体,从而防止不法分子利用印有外部对象2图像的平面仿制品对所述光学检测系统16的识别功能进行攻击。If the external object 2 is a three-dimensional object, such as but not limited to: the user's finger, when the three-dimensional finger is in surface contact with the detection area within the overlapping field of view, the fingerprint ridge of the three-dimensional finger will be in contact with the detection area within the overlapping field of view. The surface is in contact with a certain distance between the fingerprint valley and the surface of the detection area. There will be factors between the first image formed by the first imaging module 166 on the stereoscopic fingers within the overlapping field of view and the second image formed by the second imaging module 168 on the stereoscopic fingers within the overlapping field of view. Differences caused by parallax. Therefore, by analyzing whether there are differences between the images of the same external object 2 obtained from different viewing angles, it can be determined whether the external object 2 is three-dimensional, thereby preventing criminals from using flat imitations printed with images of the external object 2 to damage all objects. The recognition function of the optical detection system 16 is attacked.
具体而言,以所述立体手指的指纹脊部为第一特征点A,以所述立体手指的指纹谷部为第二特征点B,所述指纹脊部A在第一图像上对应的第一成像点A1与所述指纹谷部B在第一图像上对应的第二成像点B2之间的距离可以定义为第一间距A1B2。所述指纹脊部A在第二图像上对应的第三成像点A3与所述指纹谷部B在第二图像上对应的第四成像点B4之间的距离可以定义为第二间距A3B4。所述第一图像与第二图像之间的差异在图像尺寸方面体现为所述第一间距A1B2与所述第二间距A3B4之间的差值大于或等于预设的差值阈值。所述指纹脊部A在第一图像上对应的第一成像点A1与所述指纹谷部B在第一图像上对应的第二成像点B2之间的灰度值之差可以定义为第一灰度差。所述指纹脊部A在第二图像上对应的第三成像点A3与所述指纹谷部B在第二图像上对应的第四成像点B4之间的灰度值之差可以定义为第二灰度差。所述第一图像与第二图像之间的差异在图像灰度方面体现为所述第一灰度差与所述第二灰度差之间的差值大于或等于预设的差值阈值。Specifically, the fingerprint ridge of the three-dimensional finger is the first feature point A, and the fingerprint valley of the three-dimensional finger is the second feature point B. The fingerprint ridge A corresponds to the third feature point on the first image. The distance between an imaging point A1 and the second imaging point B2 corresponding to the fingerprint valley B on the first image can be defined as the first distance A1B2. The distance between the third imaging point A3 corresponding to the fingerprint ridge A on the second image and the fourth imaging point B4 corresponding to the fingerprint valley B on the second image may be defined as the second distance A3B4. The difference between the first image and the second image in terms of image size is reflected in the fact that the difference between the first distance A1B2 and the second distance A3B4 is greater than or equal to a preset difference threshold. The difference in gray value between the first imaging point A1 corresponding to the fingerprint ridge A on the first image and the second imaging point B2 corresponding to the fingerprint valley B on the first image can be defined as the first Grayscale difference. The difference in gray value between the third imaging point A3 corresponding to the fingerprint ridge A on the second image and the fourth imaging point B4 corresponding to the fingerprint valley B on the second image can be defined as the second Grayscale difference. The difference between the first image and the second image is reflected in the image grayscale in that the difference between the first grayscale difference and the second grayscale difference is greater than or equal to a preset difference threshold.
可选地,在本实施例中,所述光学检测系统16进行检测时选取的外部对象2的第一特征点A和第二特征点B分别为立体手指上相邻的指纹脊部和指纹谷部,即是位置上靠得最近的指纹脊部和指纹谷部。所述指纹脊部A和指纹谷部B在第一图像上对应的第一间距A1B2和在第二图像上对应的第二间距A3B4的取值范围可以为100μm至300μm,此取值范围可根据所述镜头模块160的光学参数以及所述镜头模块160、图像传感器162与保护层12相互之间的位置关系的调整而发生改变。Optionally, in this embodiment, the first feature point A and the second feature point B of the external object 2 selected by the optical detection system 16 during detection are respectively adjacent fingerprint ridges and fingerprint valleys on the three-dimensional finger. The part is the fingerprint ridge and fingerprint valley that are closest to each other. The first distance A1B2 corresponding to the fingerprint ridge A and the fingerprint valley B on the first image and the corresponding second distance A3B4 on the second image may range from 100 μm to 300 μm. This value range may be based on The optical parameters of the lens module 160 and the adjustment of the positional relationship between the lens module 160 , the image sensor 162 and the protective layer 12 change.
可选地,在其他一些实施例中,所述光学检测系统16进行检测时选取的外部对象2的第一特征点A和第二特征点B也可以分别是立体手指上非相邻的指纹脊部和指纹谷部。Optionally, in some other embodiments, the first feature point A and the second feature point B of the external object 2 selected by the optical detection system 16 during detection can also be non-adjacent fingerprint ridges on the three-dimensional finger. Department and fingerprint valley.
可选地,在本实施例中,所述第一透镜1601和第二透镜1602分别为所述多个小透镜1600当中位置相邻的一对小透镜1600,以使得所述第一透镜1601的第一视场范围FOV1与所述第二透镜1602的第二视场范围FOV2之间具有相互重叠的重叠视场范围。所述重叠视场范围分别在所述第一视场范围FOV1和第二视场范围FOV2中所占的比例超过一预设的比例值,例如:大于或等于30%。Optionally, in this embodiment, the first lens 1601 and the second lens 1602 are respectively a pair of adjacent small lenses 1600 among the plurality of small lenses 1600, so that the first lens 1601 The first field of view range FOV1 and the second field of view range FOV2 of the second lens 1602 have overlapping fields of view ranges that overlap with each other. The proportion of the overlapping field of view range in the first field of view range FOV1 and the second field of view range FOV2 exceeds a preset ratio value, for example, greater than or equal to 30%.
可选地,在其他一些实施例中,所述第一透镜1601和第二透镜1602之间也可以间隔有一个或多个所述小透镜1600,只要满足所述第一透镜1601的第一视场范围FOV1与第二透镜1602的第二视场范围FOV2之间能够形成所述重叠视场范围,且所述重叠视场范围所占的比例满足前述要求即可。Optionally, in some other embodiments, one or more small lenses 1600 may be spaced between the first lens 1601 and the second lens 1602, as long as the first viewing angle of the first lens 1601 is satisfied. The overlapping field of view range can be formed between the field range FOV1 and the second field of view range FOV2 of the second lens 1602, and the proportion of the overlapping field of view range meets the aforementioned requirements.
所述光学检测系统16还包括处理模块。所述处理模块用于比较所述重叠视场范围内外部对象2分别经所述第一透镜1601所成的第一图像与经所述第二透镜1602所成的第二图像之间的差异,并根据比较结果判断所述外部对象2是立体物体还是平面物体。其中,若所述外部对象2的第一图像与第二图像之间的差异大于或等于预设阈值,则判断所述外部对象2为立体物体;若所述外部对象2的第一图像与第二图像之间的差异小于预设阈值,则判断所述外部对象2为平面物体。The optical detection system 16 also includes a processing module. The processing module is used to compare the difference between the first image formed by the first lens 1601 and the second image formed by the second lens 1602 of the external object 2 within the overlapping field of view, And based on the comparison result, it is determined whether the external object 2 is a three-dimensional object or a planar object. Wherein, if the difference between the first image and the second image of the external object 2 is greater than or equal to the preset threshold, then the external object 2 is determined to be a three-dimensional object; if the difference between the first image and the second image of the external object 2 If the difference between the two images is less than the preset threshold, it is determined that the external object 2 is a planar object.
具体而言,如图4所示,所述外部对象2包括第一特征点A和第二特征点B。所述第一特征点A和第二特征点B在所述第一图像上对应的第一成像点A1与第二成像点B2之间的距离为第一间距A1B2。所述第一特征点A和第二特征点B在所述第二图像上对应的第三成像点A3与第四成像点B4之间的距离为第二间距A3B4。可选地,在一些实施例中,所述第一图像与第二图像之间的差异可以为所述第一间距A1B2与第二间距A3B4的差值,所述预设阈值为所述第一间距与第二间距的差值的阈值。Specifically, as shown in FIG. 4 , the external object 2 includes a first feature point A and a second feature point B. The distance between the first imaging point A1 and the second imaging point B2 corresponding to the first feature point A and the second feature point B on the first image is a first distance A1B2. The distance between the third imaging point A3 and the fourth imaging point B4 corresponding to the first feature point A and the second feature point B on the second image is the second distance A3B4. Optionally, in some embodiments, the difference between the first image and the second image may be the difference between the first distance A1B2 and the second distance A3B4, and the preset threshold is the first distance A1B2 and the second distance A3B4. The threshold for the difference between the spacing and the second spacing.
所述第一特征点A和第二特征点B在所述第一图像上对应的第一成像点A1与第二成像点B2的灰度值之差为第一灰度差。所述第一特征点A和第二特征点B在所述第二图像上对应的第三成像点A3与第四成像点B4的灰度值之差为第二灰度差。可选地,在一些实施例中,所述第一图像与第二图像之间的差异为所述第一灰度差与第二灰度差的差值,所述预设阈值为所述第一灰度差与第二灰度差的差值的阈值。The difference between the grayscale values of the first imaging point A1 and the second imaging point B2 corresponding to the first feature point A and the second feature point B on the first image is a first grayscale difference. The difference in grayscale values between the third imaging point A3 and the fourth imaging point B4 corresponding to the first feature point A and the second feature point B on the second image is a second grayscale difference. Optionally, in some embodiments, the difference between the first image and the second image is the difference between the first grayscale difference and the second grayscale difference, and the preset threshold is the third grayscale difference. The threshold value of the difference between the first gray level difference and the second gray level difference.
可选地,在本实施例中,所述外部对象2为用户手指,所述第一特征点A为手指的指纹脊部,所述第二特征点B为手指的指纹谷部。可选地,在其他一些实施例中,所述外部对象2还可以为其他立体物体,所述第一特征点A和第二特征点B可以为外部对象2上分别处于不同平面上的点。Optionally, in this embodiment, the external object 2 is the user's finger, the first feature point A is the fingerprint ridge of the finger, and the second feature point B is the fingerprint valley of the finger. Optionally, in some other embodiments, the external object 2 may also be other three-dimensional objects, and the first feature point A and the second feature point B may be points on the external object 2 that are respectively located on different planes.
可以理解的是,在对所述第一图像与第二图像进行比较之前,所述处理模块161可以通过对所述第一图像和第二图像进行特征匹配来确定所述第一特征点A和第二特征点B分别在第一图像和第二图像上的对应像点。It can be understood that, before comparing the first image and the second image, the processing module 161 can determine the first feature point A and the second image by performing feature matching on the first image and the second image. The corresponding image points of the second feature point B on the first image and the second image respectively.
可选地,在本实施例中,所述处理模块161根据两个具有相互重叠视场范围的成像模块分别从不同视角获取的外部对象2图像之间的差异来判断外部对象是否为立体。可以理解的是,在其他一些实施例中,所述处理模块161也可以通过两个以上视场范围重叠的成像模块分别从不同视角获取位于重叠视场范围内的所述外部对象2的多张图像,并对所获取的所述多张外部对象2图像相互之间的差异进行统计分析后,比如:平均差分析、标准差分析等,再与预设的差异阈值进行比较进而判断所述外部对象2是否为立体。Optionally, in this embodiment, the processing module 161 determines whether the external object is three-dimensional based on the difference between the images of the external object 2 acquired from different viewing angles by two imaging modules with mutually overlapping fields of view. It can be understood that in some other embodiments, the processing module 161 can also acquire multiple images of the external object 2 located within the overlapping fields of view from different viewing angles through two or more imaging modules with overlapping fields of view. image, and perform statistical analysis on the differences between the acquired images of the external object 2, such as mean difference analysis, standard deviation analysis, etc., and then compare them with the preset difference threshold to determine the external Whether object 2 is three-dimensional.
可选地,在本实施例中,所述处理模块161还可以用于将所述外部对象2的第一图像和/或第二图像与预存的外部对象2模板进行比对,并根据比对结果识别所述外部对象2的身份。Optionally, in this embodiment, the processing module 161 may also be used to compare the first image and/or the second image of the external object 2 with a pre-stored template of the external object 2, and based on the comparison The result identifies the identity of said external object 2.
可以理解的是,在一些实施例中,所述处理模块161在判断出所述外部对象2为立体物体后再进行上述比对和识别。所述处理模块161在判断出所述外部对象2为平面物体后不执行后续的比对和识别,从而节省所述光学检测系统16的能耗。It can be understood that, in some embodiments, the processing module 161 performs the above comparison and identification after determining that the external object 2 is a three-dimensional object. The processing module 161 does not perform subsequent comparison and identification after determining that the external object 2 is a planar object, thereby saving energy consumption of the optical detection system 16 .
可选地,在一些实施例中,所述处理模块可以与图像传感器162连接,以接收所述图像传感器162根据经镜头模块160所成的外部对象2图像转换得到的图像数据。可选地,在另外一些实施例中,所述光学检测系统还可以包括存储器18,所述图像传感器162根据所成的外部对象2图像转换得到的图像数据可以存储在所述存储器18内,所述处理模块161从所述存储器18获取所述外部对象2的图像数据。Optionally, in some embodiments, the processing module may be connected to the image sensor 162 to receive image data converted by the image sensor 162 according to the image of the external object 2 formed by the lens module 160 . Optionally, in other embodiments, the optical detection system may also include a memory 18, and the image data converted by the image sensor 162 according to the image of the external object 2 may be stored in the memory 18, so The processing module 161 obtains the image data of the external object 2 from the memory 18 .
可选地,在一些实施例中,所述处理模块161可以是固化在存储器18内的韧件或者是存储在存储器18内的计算机软件代码。所述处理模块161由对应的一个或多个处理器(图未示)执行以控制相关部件来实现对应的功能。所述处理器例如但不限于应用处理器(Application Processor,AP)、中央处理器(CPU)、微处理器(MCU)等。所述存储器18包括但不限于闪存(Flash Memory)、带电可擦写可编程只读存储器(Electrically ErasableProgrammable read only memory,EEPROM)、可编程只读存储器(Programmable read onlymemory,PROM)、以及硬盘等。所述存储器18可以用于存储用于识别外部对象2身份的所述外部对象2模板、各种预设的阈值、所述图像传感器162获取的外部对象2的图像数据、以及比较和判断过程中产生的中间数据等。Optionally, in some embodiments, the processing module 161 may be firmware solidified in the memory 18 or a computer software code stored in the memory 18 . The processing module 161 is executed by a corresponding one or more processors (not shown) to control related components to implement corresponding functions. The processor may be, for example, but not limited to, an application processor (Application Processor, AP), a central processing unit (CPU), a microprocessor (MCU), etc. The memory 18 includes, but is not limited to, flash memory (Flash Memory), electrically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), and hard disks. The memory 18 can be used to store the external object 2 template for identifying the identity of the external object 2, various preset thresholds, the image data of the external object 2 acquired by the image sensor 162, and the comparison and judgment process. Intermediate data generated, etc.
可选地,在一些实施例中,所述处理器17和/或存储器18可以与所述图像传感器162集成在相同的基板上。可选地,在其他一些实施例中,所述处理器17和/或存储器18也可以设置在所述电子设备1的主机上,比如:手机的主电路板上。Optionally, in some embodiments, the processor 17 and/or the memory 18 may be integrated on the same substrate as the image sensor 162 . Optionally, in some other embodiments, the processor 17 and/or the memory 18 may also be provided on the host of the electronic device 1, such as the main circuit board of a mobile phone.
可选地,在一些实施例中,所述处理模块161的功能还可以通过硬件来实现,例如通过下列技术中的任一项或者他们的组合来实现:具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路,具有合适的组合逻辑门电路的专用集成电路,可编程门阵列(PGA),现场可编程门阵列(FPGA)等。可以理解的是,用来实现所述处理模块161功能的上述硬件可以与所述图像传感器162集成在相同的基板上,也可以设置在所述电子设备1的主机上。Optionally, in some embodiments, the function of the processing module 161 can also be implemented by hardware, for example, by any one of the following technologies or a combination thereof: having a module for implementing logical functions on the data signal. Discrete logic circuits of logic gates, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc. It can be understood that the above-mentioned hardware used to implement the function of the processing module 161 can be integrated on the same substrate as the image sensor 162 , or can be provided on the host of the electronic device 1 .
相较于现有技术,本申请的光学检测系统16通过比较从不同视角分别获取的外部对象2图像之间是否存在因视差导致的差异进而判断所述外部对象2是否为立体物体,可有效防止不法分子利用印有外部对象2图像的平面仿制品对所述光学检测系统16的识别功能进行攻击,提高了电子设备1的安全性。Compared with the prior art, the optical detection system 16 of the present application determines whether the external object 2 is a three-dimensional object by comparing whether there are differences due to parallax between the images of the external object 2 acquired from different viewing angles, which can effectively prevent Criminals use planar imitations printed with images of external objects 2 to attack the recognition function of the optical detection system 16 , thereby improving the security of the electronic device 1 .
如图6所示,图6是本申请第二实施例的光学检测系统16b的部分截面示意图。所述光学检测系统16b和第一实施例的光学检测系统16a在结构上的区别在于:所述光学检测系统16b的第一成像模块166和第二成像模块168分别为独立的光学成像模块。所述第一成像模块166包括第一透镜1601及第一图像传感器162。所述第二成像模块168包括第二透镜1602和第二图像传感器162。所述光学检测系统16b不采用小透镜1600阵列的结构来对外部对象2成像,转而采用相互独立的所述第一透镜1601和第二透镜1602分别对所述外部对象2进行成像。所述第一透镜1601和第二透镜1602分别成像在相互独立的第一图像传感器162a和第二图像传感器162b上,而不是同一个图像传感器162的不同区域上。As shown in Figure 6, Figure 6 is a partial cross-sectional schematic diagram of the optical detection system 16b according to the second embodiment of the present application. The structural difference between the optical detection system 16b and the optical detection system 16a of the first embodiment is that the first imaging module 166 and the second imaging module 168 of the optical detection system 16b are independent optical imaging modules respectively. The first imaging module 166 includes a first lens 1601 and a first image sensor 162 . The second imaging module 168 includes a second lens 1602 and a second image sensor 162 . The optical detection system 16b does not use the structure of the small lens 1600 array to image the external object 2, but instead uses the independent first lens 1601 and the second lens 1602 to image the external object 2 respectively. The first lens 1601 and the second lens 1602 are respectively imaged on the first image sensor 162a and the second image sensor 162b that are independent of each other, rather than on different areas of the same image sensor 162.
可选地,在一些实施例中,所述光学检测系统16b也可以包括两个以上视场范围重叠的独立成像模块,分别从不同视角获取位于重叠视场范围内的所述外部对象2的多张图像。所述处理模块161(参考图5)可以对所获取的所述多张外部对象2图像相互之间的差异进行统计分析后,比如:平均差分析、标准差分析等,再与预设的差异阈值进行比较并判断所述外部对象2是否为立体。Optionally, in some embodiments, the optical detection system 16b may also include more than two independent imaging modules with overlapping fields of view, and obtain multiple images of the external object 2 located within the overlapping fields of view from different viewing angles. images. The processing module 161 (refer to Figure 5) can perform statistical analysis on the differences between the acquired images of the external object 2, such as mean difference analysis, standard deviation analysis, etc., and then compare them with the preset differences. The threshold is compared to determine whether the external object 2 is three-dimensional.
需要说明的是,本领域技术人员可以理解,在不付出创造性劳动的前提下,本申请实施例的部分或全部,以及对于实施例的部分或全部的变形、替换、变更、拆分、组合、扩展等均应认为被本申请的本申请创造思想所涵盖,属于本申请的保护范围。It should be noted that those skilled in the art can understand that part or all of the embodiments of the present application, as well as modifications, replacements, changes, disassemblies, combinations, Extensions, etc. should be considered to be covered by the creative ideas of this application and belong to the protection scope of this application.
在本说明书中对于“一个实施例”、“实施例”、“示例实施例”等的任何引用表示结合该实施例描述的特定特征、结构或特性被包括在本申请的至少一个实施例中。在本说明书中不同位置出现的这种短语并不一定全部指相同的实施例。另外,当结合任何实施例描述特定的特征或结构时,所主张的是,结合这些实施例的其它实施例来实现这种特征或结构在本领域技术人员的技术范围内。Any reference in this specification to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Additionally, when a particular feature or structure is described in connection with any embodiment, it is claimed that it is within the skill of those skilled in the art to implement such feature or structure in conjunction with other embodiments of these embodiments.
本申请说明书中可能出现的“长度”、“宽度”、“上”、“下”、“左”、“右”、“前”、“后”、“背面”、“正面”、“竖直”、“水平”、“顶部”、“底部”、“内部”、“外部”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请实施例和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。相似的标号和字母在附图中表示类似项,因此,一旦某一项在一个附图中被定义,则在随后的附图中不需要对其进行进一步定义和解释。同时,在本申请的描述中,术语“第一”、“第二”等仅用于区分描述,而不能理解为指示或暗示相对重要性。在本申请的描述中,“多种”或“多个”的含义是至少两种或两个,除非另有明确具体的限定。本申请的描述中,还需要说明的是,除非另有明确的规定和限定,“设置”、“安装”、“连接”应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或一体地连接;可以是机械连接,也可以是电连接;可以是直接连接,也可以是通过中间媒介间接连接,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以具体情况理解上述术语在本申请中的具体含义。"Length", "width", "top", "bottom", "left", "right", "front", "back", "back", "front", "vertical" that may appear in this application specification ", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and The simplified description is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present application. Similar reference numbers and letters refer to similar items in the drawings, so that once an item is defined in one drawing, it does not need further definition or explanation in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second", etc. are only used to differentiate the description and cannot be understood as indicating or implying relative importance. In the description of this application, "a plurality" or "a plurality" means at least two or two, unless otherwise expressly and specifically limited. In the description of this application, it should also be noted that, unless otherwise clearly stipulated and limited, "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis.
以上所述,仅为本申请的具体实施例,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本申请的保护范围之内。权利要求书中所使用的术语不应理解为将本申请限制于本说明书中所公开的特定实施例。因此,本申请的保护范围应以所述权利要求的保护范围为准。The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application. should be covered by the protection scope of this application. The terms used in the claims should not be construed as limiting the application to the specific embodiments disclosed in the specification. Therefore, the protection scope of this application should be subject to the protection scope of the claims.
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