CN211375621U - Iris 3D information acquisition equipment and iris identification equipment - Google Patents
Iris 3D information acquisition equipment and iris identification equipment Download PDFInfo
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- CN211375621U CN211375621U CN202020174965.3U CN202020174965U CN211375621U CN 211375621 U CN211375621 U CN 211375621U CN 202020174965 U CN202020174965 U CN 202020174965U CN 211375621 U CN211375621 U CN 211375621U
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Abstract
The utility model provides iris 3D information acquisition equipment and iris recognition equipment, wherein the iris 3D information acquisition equipment comprises an image acquisition device and a rotating device; the rotating device is connected with the image acquisition device and is positioned in the direction which is deviated from the iris behind the image acquisition device; the center of the rotation circle of the image acquisition device is positioned in the direction towards the iris. The concave motion track of the camera suitable for iris acquisition is realized by matching the rotating shaft and the two-dimensional guide rail for the first time, and the volume of the equipment is not increased.
Description
Technical Field
The utility model relates to an iris appearance measures technical field, in particular to 3D appearance measures technical field.
Background
At present, when iris recognition is carried out, eyes of a human body are usually photographed, iris pictures are collected and compared with previously collected standard pictures, and therefore whether identity authentication can be passed or not is judged. However, such alignments are all alignments using planar images, which makes the alignments lose the actual presence of one-dimensional data (depth data). There is a large misjudgment rate.
Moreover, two-dimensional image acquisition can only describe two-dimensional characteristics of the iris, so that the measurement of the iris is too simple and the real three-dimensional size and shape of the iris cannot be reflected.
There are also some active three-dimensional topography measurement schemes, but all require active light emission. Such as structured light, infrared. These methods are more suitable for application to other parts of the body. If iris topography acquisition is performed, it inevitably results in excessively bright light entering the eye. Although invisible light is adopted at present, the energy of actual light still enters the fundus, and the fundus is diseased after long-term use.
Although some solutions for visual measurement have been proposed, pictures of different angles of the object are collected and matched and spliced to form a 3D model. When pictures at different angles are collected, a plurality of cameras can be arranged at different angles of the object to be detected, and the pictures can be collected from different angles through rotation of a single camera or a plurality of cameras. But these solutions are designed for larger objects, such as vases, palms, bodies. The iris has the characteristics of small target and relatively small curvature. That is, the iris is generally flatter, macroscopically three-dimensional features are not apparent, and direct acquisition cannot be surrounded directly using devices for measuring larger objects. If similar structures are used for acquisition, the characteristic points are fewer and the matching is difficult to succeed, thereby reducing the speed and the precision of the synthesis.
Also in the prior art, it has been proposed to use empirical formulas including rotation angle, target size, and object distance to define the camera position, thereby taking into account the speed and effect of the synthesis. However, in practical applications it is found that: unless a precise angle measuring device is provided, the user is insensitive to the angle and is difficult to accurately determine the angle; the size of the target is difficult to accurately determine, and particularly, the target needs to be frequently replaced in certain application occasions, each measurement brings a large amount of extra workload, and professional equipment is needed to accurately measure irregular targets. The measured error causes the camera position setting error, thereby influencing the acquisition and synthesis speed and effect; accuracy and speed need to be further improved. Especially for the acquisition of the iris, it is not easy to measure its size and object distance.
Therefore, the following technical problems are urgently needed to be solved: firstly, the synthesis speed and the synthesis precision of the iris 3D model can be improved simultaneously; and the iris 3D acquisition modeling cost is reduced, and the complexity and the volume of excessive equipment are not increased. The operation is convenient, professional equipment is not needed, and excessive measurement is not needed. And fourthly, the method is suitable for collecting the small-size and low-curvature characteristics of the iris.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an iris 3D information collecting apparatus that overcomes or at least partially solves the above problems.
The utility model provides iris 3D information acquisition equipment, which comprises an image acquisition device and a rotating device;
the rotating device is connected with the image acquisition device and is positioned in the direction which is deviated from the iris behind the image acquisition device;
the center of the rotation circle of the image acquisition device is positioned in the direction towards the iris.
In an optional embodiment, the device further comprises an X rail and a Y rail which are respectively connected with the image acquisition device in a sliding manner.
In an alternative embodiment, the X-rail or the Y-rail is connected to the image capturing device via a carrying device.
In an alternative embodiment, the rotating device comprises a rotating shaft and a rotating arm, one end of the rotating arm is fixedly connected with the rotating shaft, and the other end of the rotating arm is rotatably connected with the bearing device.
In an alternative embodiment, a head fixation portion is further included.
In an alternative embodiment, the head fixing portion is U-shaped and the upper portion includes a forehead fixing member.
In an alternative embodiment, when the image capturing device captures the target object, the two adjacent capturing positions satisfy the following conditions:
wherein L is the linear distance between the optical centers of the two position image acquisition devices; f is the focal length of the image acquisition device; d is the rectangular length of the photosensitive element of the image acquisition device; t is the distance from the photosensitive element of the image acquisition device to the surface of the target along the optical axis; to adjust the coefficient;
and < 0.478.
In an alternative embodiment, < 0.383.
In an alternative embodiment, < 0.253.
The embodiment of the utility model provides an iris identification equipment is still provided, including using above-mentioned arbitrary equipment.
Invention and technical effects
1. The concave motion track of the camera suitable for iris acquisition is realized by matching the rotating shaft and the two-dimensional guide rail for the first time. And does not increase the volume of the device.
2. The position of the camera for collecting the picture is optimized, so that the 3D synthesis speed and the synthesis precision can be improved at the same time; and when the position is optimized, the angle and the target size do not need to be measured, and the applicability is stronger.
3. Through the design of the light source and the light filter of the image acquisition equipment, the interference of light spots is avoided.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an iris 3D information acquisition device provided in an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure of an iris 3D information acquisition device provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of a head fixing portion according to another embodiment of the present invention.
The device comprises an image acquisition device 1, a bearing device 2, a rotating device 3, a 4X track, a 5Y track and a 6 head fixing part.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Iris 3D information acquisition equipment structure
In order to solve the technical problem, the utility model provides an iris 3D information acquisition equipment, as shown in fig. 2, 3, including image acquisition device 1, bear device 2, rotary device 3, X track 4, Y track 5.
The image acquisition device 1 is fixed on the bearing device 2, one end of the bearing device 2 is connected with the rotating device 3, and the other end is fixed with the image acquisition device 1. Meanwhile, the bearing device 2 is connected with the Y track 5 in a sliding mode and can slide on the Y track 5, so that the image acquisition device 1 is driven to move in the Y direction. The Y track 5 is orthogonal to the X track 4 and is connected in a sliding manner, and the Y track 5 module can slide on the X track 4, so that the Y track 5 moves in the X direction as a whole, and the carrying device 2 thereon and the image acquisition device 1 on the carrying device 2 can move in the X direction.
The rotating device 3 comprises a motor, a rotating shaft and a rotating arm. One end of the rotating arm is connected with the rotating shaft in a fixed connection mode (so that the rotating arm is driven to rotate); the other end of the rotating arm is connected with one end of the bearing device 2 in a rotatable connection mode. The motor rotates the shaft and thereby the boom, which rotates the carrier 2, so that the carrier 2 performs a combined movement on the X-rail 4 and the Y-rail 5, which is in fact a rotation. However, for the X-rail 4, the carrier 2 only performs X-direction movement; for the Y-rail 5, the carrier 2 only performs Y-direction movements. However, since the two directions perform a compound motion, the motion of the carrying device 2 is a rotational motion around the center of a circle as a whole, so that the image capturing device 1 thereon rotates. The driving of the rotation is from the motor of the rotating device 3, and the rail is not an XY rail, but more a bearing function, that is, the rail is a follow-up rail. By the structure, the motion track of the image acquisition device 1 is concave, namely, the image acquisition device rotates approximately by taking the eyes of a human body as the center of a circle. That is, the rotating device 3 drives the image capturing device 1 to perform a rotational motion around a certain point in the direction of the iris, and the rotating device 3 is located behind the image capturing device and away from the iris. The point can be an iris, and a certain point of the head or a certain point in space can be selected according to needs, but the motion track is concave as a whole, so that images of the iris at different angles can be shot. Conventionally, if such an effect is to be achieved, it is necessary to provide a rotating shaft near the human body. For example, a cantilever is arranged above the head of a human body, and the extension line of the rotating shaft of the cantilever is superposed with the eyes of the human body. However, such a cantilever arrangement requires not only a large volume per se but also a large counterweight, which obviously increases the volume and weight of the device as a whole, so that the device cannot be easily moved. And adopt the utility model discloses a scheme, it can set up to the desktop formula completely, carries whole equipment anytime and anywhere.
Of course, in another embodiment, the rotating device may not be provided, but the carrying device may be driven to move on the X track and the Y track simultaneously, as long as the composite motion in two directions is ensured to be rotation.
The image acquisition device can be connected with the bearing device through the supporting piece, so that the image acquisition device can be erected in the vertical direction on the whole, and the human eyes can be conveniently acquired.
The image acquisition device can be a CCD, a CMOS, a camera, a video camera, an industrial camera, a monitor, a camera, a mobile phone, a tablet, a notebook, a mobile terminal, a wearable device, intelligent glasses, an intelligent watch, an intelligent bracelet and all devices with image acquisition function. In particular, the image acquisition device may be in the infrared band.
Meanwhile, the periphery of the image acquisition device is provided with a light source which can be a circular ring-shaped illumination light source. The light source can be an LED light source or an intelligent light source, namely, the light source parameters are automatically adjusted according to the conditions of the target object and the ambient light. Usually, the light sources are distributed around the lens of the image capturing device, for example, the light sources are ring-shaped LED lamps around the lens. In particular, a light softening means, for example a light softening envelope, may be arranged in the light path of the light source. Or the LED surface light source is directly adopted, so that the light is soft, and the light is more uniform. Preferably, an OLED light source can be adopted, the size is smaller, the light is softer, and the flexible OLED light source has the flexible characteristic and can be attached to a curved surface. The light source may include two types, a visible light source and an infrared light source.
However, since the eye is very special, the eye itself is an optical structure, and when the light source is used for light compensation, the image of the light source will be displayed in the image. If the image of the light source happens to appear in the iris region, bright spots will appear in the region on the image, resulting in loss of iris information on the image. To avoid this, it is also necessary to align the device and the eye so that the image of the light source appears in the pupil section (which information is not needed to reconstruct a 3D model of the iris), or in other non-iris regions. In order to solve the problems, on one hand, the light source can be modified, the position of the light source can be changed, and interference images can be prevented. The light source may also be dimmed and the illumination made more diffuse.
In another embodiment, another solution for avoiding the interference of the light source with the image is provided: arranging an optical filter at the front end of the visible light source to filter infrared light; an optical filter is arranged before the infrared image acquisition equipment receives the image, and visible light is filtered out. Therefore, the 'over-bright' visible light can be filtered out and does not enter the image acquisition equipment, and the image is prevented from being interfered by the visible light image of the light source. This is one of the inventions of the present invention.
In another embodiment, a head-holding part 6, i.e. a face support, may be provided for positioning the human face at the time of acquisition, thereby achieving alignment of the image acquisition device with the human face. The support can be U type, and the chin is placed to U type lower part, and face rotation and translation are placed to both sides. The U-shaped lower part is provided with a vertical column, and the U-shaped fixing part is rotatably connected to the vertical column, so that the position of the U-shaped fixing part can be adjusted in a left-right rotating mode. The U-shaped fixing part can move up and down on the upright post, so that the height of the fixing part can be adjusted in the vertical direction. Thus, the alignment of the U-shaped fixing part and the image acquisition device 1 can be adjusted before use. Of course, the fixing portion may also have other suitable shapes besides the U-shape, please refer to fig. 3, for example, a forehead fixing member is added on the upper end of the U-shaped fixing portion, so that the front and back positions of the head of the person at the U-shaped fixing portion are relatively fixed, which is convenient and accurate for measurement. This is also the new structure that the utility model adopts for accurate measurement.
Acquisition position optimization of image acquisition device
According to a number of experiments, the separation distance of the acquisitions preferably satisfies the following empirical formula:
when 3D acquisition is carried out, the positions of two adjacent image acquisition devices or the positions of two adjacent image acquisition devices meet the following conditions:
wherein L is the linear distance between the optical centers of the two image acquisition devices; f is the focal length of the image acquisition device; d is the rectangular length of a photosensitive element (CCD) of the image acquisition device; t is the distance from the photosensitive element of the image acquisition device to the surface of the target along the optical axis; to adjust the coefficient, < 0.601.
When the image acquisition device is at any one of the two positions, the distance from the photosensitive element to the surface of the target object along the optical axis is taken as T. In addition to this method, in another case, L is An、An+1Linear distance between optical centers of two image capturing devices, and An、An+1Two image acquisition devices adjacent to each othern-1、An+2Two image acquisition devices and An、An+1The distances from the respective photosensitive elements of the two image acquisition devices to the surface of the target object along the optical axis are respectively Tn-1、Tn、Tn+1、Tn+2，T＝(Tn-1+Tn+Tn+1+Tn+2)/4. Of course, the average value may be calculated by using more positions than the adjacent 4 positions.
L should be the linear distance between the optical centers of the two image capturing devices, but since the position of the optical center of the image capturing device is not easily determined in some cases, the center of the photosensitive element of the image capturing device, the geometric center of the image capturing device, the center of the shaft connecting the image capturing device and the pan/tilt head (or platform, support), and the center of the proximal or distal surface of the lens can be used instead in some cases, and the error caused by the displacement is found to be within an acceptable range through experiments.
In general, parameters such as object size and angle of view are used as means for estimating the position of a camera in the prior art, and the positional relationship between two cameras is also expressed in terms of angle. Because the angle is not well measured in the actual use process, it is inconvenient in the actual use. Also, the size of the object may vary with the variation of the measurement object. For example, when the head of a child is collected after 3D information on the head of an adult is collected, the head size needs to be measured again and calculated again. The inconvenient measurement and the repeated measurement bring errors in measurement, thereby causing errors in camera position estimation. According to the scheme, the experience conditions required to be met by the position of the camera are given according to a large amount of experimental data, so that the problem that the measurement is difficult to accurately measure the angle is solved, and the size of an object does not need to be directly measured. In the empirical condition, d and f are both fixed parameters of the camera, and corresponding parameters can be given by a manufacturer when the camera and the lens are purchased without measurement. And T is only a straight line distance, and can be conveniently measured by using a traditional measuring method, such as a ruler and a laser range finder. Therefore, the utility model discloses an empirical formula makes the preparation process become convenient and fast, has also improved the degree of accuracy of arranging of camera position simultaneously for the camera can set up in the position of optimizing, thereby has compromise 3D synthetic precision and speed simultaneously, and concrete experimental data is seen below.
Utilize the utility model discloses the device is tested, has obtained following experimental result:
from the above experimental results and a lot of experimental experiences, it can be derived that the value should satisfy <0.601, and at this time, a part of the 3D model can be synthesized, and although a part cannot be automatically synthesized, it is acceptable in the case of low requirements, and the part which cannot be synthesized can be compensated manually or by replacing the algorithm. Particularly, when the value satisfies <0.478, the balance between the synthesis effect and the synthesis time can be optimally taken into consideration; to obtain better synthesis effect, the selection of <0.383 can be used, in which case the synthesis time will increase, but the synthesis quality is better. Of course to further enhance the effect of the synthesis, <0.253 may be selected. It should be noted that the above ranges are only preferred embodiments and should not be construed as limiting the scope of protection.
It should be noted that: specific synthesis methods can be found in patent CN2019112760643, or by using other known algorithms.
Moreover, as can be seen from the above experiment, for the determination of the photographing position of the camera, only the camera parameters (focal length f, CCD size) and the distance T between the camera CCD and the object surface need to be obtained according to the above formula, which makes it easy to design and debug the device. Since the camera parameters (focal length f, CCD size) are determined at the time of purchase of the camera and are indicated in the product description, they are readily available. Therefore, the camera position can be easily calculated according to the formula without carrying out complicated view angle measurement and object size measurement. Especially in some occasions, the lens of the camera needs to be replaced, so the method of the utility model can directly replace the conventional parameter f of the lens to calculate and obtain the position of the camera; similarly, when different objects are collected, the measurement of the size of the object is complicated due to the different sizes of the objects. And use the utility model discloses a method need not to carry out object size measurement, can confirm the camera position more conveniently. And use the utility model discloses definite camera position can compromise composition time and synthetic effect. Therefore, the above-mentioned empirical condition is one of the points of the present invention.
The above data are obtained only by experiments for verifying the conditions of the formula, and are not limited to the structure of the utility model. Without these data, the objectivity of the formula is not affected. Those skilled in the art can adjust the equipment parameters and the step details as required to perform experiments, and obtain other data which also meet the formula conditions.
The adjacent collection positions refer to two adjacent positions of collection action on the moving track when the image collection device moves relative to the target object. This is generally easily understood for the image acquisition device movements. However, when the target object moves to cause relative movement between the two, the movement of the target object should be converted into the movement of the target object, which is still, and the image capturing device moves according to the relativity of the movement. And then measuring two adjacent positions of the image acquisition device in the converted movement track.
Applications of
Utilize the utility model discloses above-mentioned device and method can gather user's iris image to finally synthesize iris 3D model, thereby obtain the three-dimensional information of user's iris. Since the three-dimensional information of each individual iris is unique, this data can be stored as standard data, for example in a bank database. When the user needs to perform identity authentication, the acquisition equipment is used for shooting the image of the iris of the user, and 3D iris modeling is performed, so that the three-dimensional information of the iris of the user at the current moment is obtained, and the three-dimensional information is called as real-time data. And comparing the real-time data with the standard data, and if the similarity between the real-time data and the standard data is higher than a certain threshold (for example, 80%), determining that the iris recognition is passed and verifying the identity of the user.
According to the utility model discloses gather the iris three-dimensional model who founds, can carry out the operation simulation and the operation planning at relevant position. The three-dimensional appearance of the relevant part can be displayed on a computer, and the treatment mode of the focus is operated on the data level and finally displayed, thereby evaluating the operation effect.
The rotation movement of the invention is that the front position collection plane and the back position collection plane are crossed but not parallel in the collection process, or the optical axis of the front position image collection device and the optical axis of the back position image collection device are crossed but not parallel. That is, the capture area of the image capture device moves around or partially around the target, both of which can be considered as relative rotation. Although the embodiment of the present invention exemplifies more orbital rotation, it should be understood that the limitation of the present invention can be used as long as the non-parallel motion between the acquisition region of the image acquisition device and the target object is rotation. The scope of the invention is not limited to the embodiment with track rotation.
The adjacent acquisition positions refer to two adjacent positions on a movement track where acquisition actions occur when the image acquisition device moves relative to a target object. This is generally easily understood for the image acquisition device movements. However, when the target object moves to cause relative movement between the two, the movement of the target object should be converted into the movement of the target object, which is still, and the image capturing device moves according to the relativity of the movement. And then measuring two adjacent positions of the image acquisition device in the converted movement track.
The target object, and the object all represent objects for which three-dimensional information is to be acquired. The object may be a solid object or a plurality of object components. For example, the head, hands, etc. The three-dimensional information of the target object comprises a three-dimensional image, a three-dimensional point cloud, a three-dimensional grid, a local three-dimensional feature, a three-dimensional size and all parameters with the three-dimensional feature of the target object. The utility model discloses the three-dimensional is that to have XYZ three direction information, especially has degree of depth information, and only two-dimensional plane information has essential difference. It is also fundamentally different from some definitions, which are called three-dimensional, panoramic, holographic, three-dimensional, but actually comprise only two-dimensional information, in particular not depth information.
The capture area in the present invention refers to a range in which an image capture device (e.g., a camera) can capture an image.
The 3D information of multiple regions of the target obtained in the above embodiments can be used for comparison, for example, for identification of identity. Firstly, the scheme of the invention is utilized to acquire the 3D information of the face and the iris of the human body, and the information is stored in a server as standard data. When the system is used, for example, when the system needs to perform identity authentication to perform operations such as payment and door opening, the 3D acquisition device can be used for acquiring and acquiring the 3D information of the face and the iris of the human body again, the acquired information is compared with standard data, and if the comparison is successful, the next action is allowed. It can be understood that the comparison can also be used for identifying fixed assets such as antiques and artworks, namely, the 3D information of a plurality of areas of the antiques and the artworks is firstly acquired as standard data, when the identification is needed, the 3D information of the plurality of areas is acquired again and compared with the standard data, and the authenticity is identified.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be appreciated by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in an apparatus in accordance with embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. The utility model provides an iris 3D information acquisition equipment which characterized in that: comprises an image acquisition device and a rotating device;
the rotating device is connected with the image acquisition device and is positioned in the direction which is deviated from the iris behind the image acquisition device;
the center of the rotation circle of the image acquisition device is positioned in the direction towards the iris.
2. The apparatus of claim 1, wherein: the X-track and the Y-track are respectively connected with the image acquisition device in a sliding manner.
3. The apparatus of claim 2, wherein: the X track or the Y track is connected with the image acquisition device through the bearing device.
4. The apparatus of claim 1, wherein: the rotating device comprises a rotating shaft and a rotating arm, one end of the rotating arm is fixedly connected with the rotating shaft, and the other end of the rotating arm is rotatably connected with the bearing device.
5. The apparatus of claim 2, wherein: also comprises a head fixing part.
6. The apparatus of claim 5, wherein: the head fixing part is U-shaped, and the upper part comprises a forehead fixing piece.
7. The apparatus of any of claims 1-5, wherein:
when the image acquisition device acquires a target object, the two adjacent acquisition positions meet the following conditions:
wherein L is the linear distance between the optical centers of the two position image acquisition devices; f is the focal length of the image acquisition device; d is the rectangular length of the photosensitive element of the image acquisition device; t is the distance from the photosensitive element of the image acquisition device to the surface of the target along the optical axis; to adjust the coefficient;
and < 0.478.
8. The apparatus of claim 7, wherein: < 0.383.
9. The apparatus of claim 7, wherein: < 0.253.
10. An iris recognition apparatus characterized by: comprising the use of the device according to any of claims 1-9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254680A (en) * | 2020-10-15 | 2021-01-22 | 天目爱视（北京）科技有限公司 | Multi freedom's intelligent vision 3D information acquisition equipment |
| CN112254673A (en) * | 2020-10-15 | 2021-01-22 | 天目爱视（北京）科技有限公司 | Self-rotation type intelligent vision 3D information acquisition equipment |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112254680A (en) * | 2020-10-15 | 2021-01-22 | 天目爱视（北京）科技有限公司 | Multi freedom's intelligent vision 3D information acquisition equipment |
| CN112254673A (en) * | 2020-10-15 | 2021-01-22 | 天目爱视（北京）科技有限公司 | Self-rotation type intelligent vision 3D information acquisition equipment |
| CN112254673B (en) * | 2020-10-15 | 2022-02-15 | 天目爱视（北京）科技有限公司 | Self-rotation type intelligent vision 3D information acquisition equipment |
| CN112254680B (en) * | 2020-10-15 | 2022-08-12 | 天目爱视（北京）科技有限公司 | Multi freedom's intelligent vision 3D information acquisition equipment |
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