CN109684966A - A kind of iris capturing apparatus and method for of extended field of view range - Google Patents
A kind of iris capturing apparatus and method for of extended field of view range Download PDFInfo
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- CN109684966A CN109684966A CN201811540107.XA CN201811540107A CN109684966A CN 109684966 A CN109684966 A CN 109684966A CN 201811540107 A CN201811540107 A CN 201811540107A CN 109684966 A CN109684966 A CN 109684966A
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- Prior art keywords
- iris
- camera
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- image
- acquisition
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/19—Sensors therefor
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformation in the plane of the image
- G06T3/40—Scaling the whole image or part thereof
- G06T3/4038—Scaling the whole image or part thereof for image mosaicing, i.e. plane images composed of plane sub-images
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
Abstract
The invention discloses a kind of iris capturing equipment of extended field of view range, including camera array, infrared illumination unit, control module, using the camera array of identical object space focal length, pass through multi-data synchronous control algolithm, the technical effect for realizing extension acquisition plane, increasing field range, user's achievable Image Acquisition in more wide in range region, it is not necessary to be limited to individually image the field range of stenocephaly；The present invention uses multichannel data synchronization transfer method simultaneously, guarantees synchronously control and image mosaic that multichannel data is realized under conditions of certain image transmitting frame per second.
Description
Technical field
The present invention relates to iris capturing field, it is specifically related to iris capturing equipment and the side of a kind of extended field of view range
Method.
Background technique
Presented iris identification equipment often configures single iris camera, by the lesser limitation of camera field angle, uses
Person slightly shift position, eyes are possible to have exceeded the range of camera field angle, lead to not acquire complete eyes figure
Picture.Traditional solution includes screen self feed back, mirror feedback, aperture source alignment etc., and user is prompted voluntarily to adjust, actively
Cooperation, which adjusts eyes position to equipment, to complete binocular images acquisition in acquisition range.This method obviously reduces use
Family experience, causes certain difficulty to the user for being unfamiliar with equipment working principle.
Summary of the invention
In view of the above-mentioned problems, the present invention provides the iris capturing equipment with camera array, and can be realized more
Circuit-switched data synchronous transfer.
Technical solution of the present invention: iris capturing equipment of the present invention includes camera array, infrared illumination unit, control mould
Block, wherein camera array include at least two iris cameras, iris camera configure identical image space focal length camera lens and
There is part between the field range of iris camera to reach identical object space focal length in the imaging sensor of equal resolution
Overlapping；The left and right sides or surrounding of the infrared illumination cell distribution in camera array；Control module is by control system group
At by the image synthesis big figure of one width of all iris cameras acquisition, output to computer or display equipment realize expansion with this
Open up the technical effect of field range.
Iris camera is connect with FPGA respectively by DVP (MIPI) access, and the sensor resolution of iris camera is not
Lower than 2Mega Pixel, FPGA connection RAM storage chip and USB PHY chip, RAM storage chip may be configured as DDR2SDRAM
Or DDR3SDRAM, it is preferred to use DDR3SDRAM, USB PHY chip are connected with ROM storage chip and computer.Its workflow
Journey is that six iris cameras start simultaneously at acquisition image, and control system receives all according to camera synchronization control algorithm
The image data of iris camera acquisition, is cached, and splicing becomes the big figure of a width, and these data are converted to USB3.0 number
USB PHY chip is sent to according to frame, and then computer is at USB PHY chip reading image data, the algorithm of computer-internal
Modules A PI interface is managed since data volume is larger, it is recommended to use the USB PHY chip of USB3.0 interface.
The iris camera of camera array is square arrangement, and arrangement mode is 2*2 or 2*3 etc., between camera
There is part overlapping there are certain angle, between field range in primary optical axis, thus deposit between the image of each camera acquisition
It is centainly being overlapped, to avoid the phenomenon that there are vacancies in the field range that camera array is formed.
Multi-data synchronous control algolithm is, since the 1st iris camera, fpga chip successively takes the photograph each iris
As the data that head acquires are cached, every iris camera caching is waited for after completing, until all irises are taken the photograph
The data buffer storage acquired as head is completed, and multichannel data is synthesized the big figure of a width；Later again since the 1st iris camera,
The data of each iris camera acquisition are cached successively, and so on.
Camera array synchronisation control means of the invention, the waiting time of every iris camera acquisition data is not
The cache-time of data is acquired to it more than fpga chip.In 4 iris cameras of device configuration, can guarantee to take the photograph with iris
As the big figure of frame per second output of original frame per second half.
Beneficial effects of the present invention: 1. iris capturing equipment of the invention, identical object space focal length can be reached by having
Camera array, every iris camera have independent field range, and the image that equipment acquires more iris cameras is spelled
It is connected into the big figure of a width, computer is transferred to and is handled, the technical effect for realizing extension acquisition plane, increasing field range,
User's achievable Image Acquisition in more wide in range region, it is not necessary to be limited to individually image the field range of stenocephaly；
2. the present invention solves the problems, such as multiple cameras because of asynchronous, realization multichannel caused by obtaining image there are the time difference
Data synchronous transfer guarantees that the synchronously control that multichannel data is realized under conditions of certain image transmitting frame per second and image are spelled
It connects.
It should be appreciated that aforementioned description substantially and subsequent detailed description are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Detailed description of the invention
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, in which:
Fig. 1 schematically shows the hardware theory of constitution schematic diagram of iris capturing equipment of the invention；
Fig. 2 schematically shows camera array distribution schematic diagram of the invention；
Fig. 3 schematically shows the synchronisation control means of camera array of the invention；
Fig. 4 schematically shows the equipment acquisition image schematic diagram with 2*2 camera array of the invention.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in those skilled in the relevant arts' Integrated Understanding detail of the invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical appended drawing reference represents identical
Or similar component or same or like step.
The iris capturing equipment with camera array that the present invention provides a kind of, and it is synchronous to can be realized multichannel data
Transmission, specifically includes the acquisition device hardware composing method being made of camera array and control chip and multichannel data is same
Walk control method.
The working principle of iris capturing equipment of the present invention are as follows: user walks close to iris capturing equipment, the iris of camera array
Camera starts acquisition image simultaneously, and multiway images data are realized through control system and synchronized, and are spliced into big figure and are transferred to
Computer and display equipment, display equipment shows the big figure that is combined into of image acquired by each iris camera, in computer
Algorithm processing module detected whether in big figure there are human eye, and if so, carrying out iris registration or iris recognition.?
Distance detection unit can be added, is started for triggering camera array after detecting that user enters effective acquisition range
Image is acquired, when not having user in front of equipment, iris camera is in a dormant state.
The hardware of iris capturing equipment forms
Iris capturing equipment of the present invention includes camera array, infrared illumination unit, control module, wherein the camera
Array includes at least two iris cameras, and the iris camera configures the camera lens and equal resolution of identical image space focal length
Imaging sensor, there is part overlapping to reach identical object space focal length, between the field range of iris camera；
The left and right sides or surrounding of the infrared illumination cell distribution in camera array；
The control module is made of control system, and it is big that the image of all iris cameras acquisition is synthesized a width
Figure, output to computer or display equipment, the technical effect of extended field of view range is realized with this.
Fig. 1 show the connection type of camera array and control system of the invention, camera battle array in this implementation
Column include six iris cameras, and six iris cameras are connect with control system respectively by the access of DVP interface.
The resolution ratio of described image sensor is not less than 2Mega Pixel；
The control system connection RAM storage chip and USB PHY chip, RAM storage chip may be configured as
DDR2SDRAM or DDR3SDRAM, the present embodiment use DDR3SDRAM, USB PHY chip and ROM storage chip and computer
It is connected.
The specific workflow of the present embodiment are as follows: six iris cameras start simultaneously at acquisition image, and FPGA control is single
Member receives the image data of iris camera 1-6 acquisition according to camera synchronization control algorithm, is cached, and splicing becomes a width
Big figure, and these data are converted to USB3.0 data frame and send USB PHY chip to, then computer is from USB PHY chip
Image data is read, the algorithm processing module api interface of computer-internal is larger due to data volume, it is recommended to use USB3.0 interface
USB PHY chip.
Fig. 2 show camera array distribution map of the invention, and the iris camera of the camera array is square row
Column, arrangement mode are 2*2 or 2*3 etc., and the primary optical axis between camera exists between field range there are certain angle
Part is overlapped, and thus there is certain overlapping between the image of each camera acquisition, to avoid in camera array formation
The phenomenon that there are vacancies in field range.
Multichannel data synchronization control algorithm
Fig. 3 is the synchronisation control means of 4 iris cameras of the invention, and wherein the first row to fourth line indicates that iris is taken the photograph
As head 1-4 output data timing, fifth line to the 8th row indicates the data buffer storage timing of iris camera 1-4,
As shown in figure 3,Moment fpga chip starts to cache the data that iris camera 1 obtains, and arrivesWhen
Quarter terminates, and completes the caching of a frame data, waits later, the data that pause caching iris camera 1 obtains；?Moment starts
The data obtained to iris camera 2 cache, and arriveMoment terminates, and completes the caching of a frame data, waits later, suspends
Cache the data that iris camera 2 obtains；?Moment starts to cache the data that iris camera 3 obtains, and arrivesWhen
Quarter terminates, and completes the caching of a frame data, waits later, the data that pause caching iris camera 3 obtains；?Moment starts
The data obtained to iris camera 4 cache, and arriveMoment terminates, and completes the caching of a frame data, waits later, suspends
Cache the data that iris camera 4 obtains；It arrivesThe frame data obtained to all iris camera 1-4 are completed in moment position
Caching.Four tunnel image datas are synthesized the big figure of a width by fpga chip, are transferred to image processing module by USB chip and are carried out
Algorithm analysis, or be transferred to display screen and show.Exist laterMoment continues to start to carry out the data that iris camera 1 obtains
Caching, and so on, to the caching of all iris camera 1-4 frame data obtained, four tunnel image datas are synthesized one
The big figure of width, is transferred to image processing module or display screen.
Thus camera array synchronisation control means of the invention can guarantee in 4 iris cameras of device configuration
With the big figure of frame per second output of the original frame per second half of iris camera.
In addition to this, camera array has 2 iris cameras, 6 iris cameras or other pairs of situations,
This data synchronization control algorithm can be used.
Fig. 4 show the schematic diagram of camera array acquisition image of the invention, and wherein camera array includes 2*2 arrangement
Iris camera, the image of four iris camera independent acquisitions is respectively region E1, E2, E3, E4, four iris cameras
Data collected are cached in FPGA, synchronize control, are merged into the big figure E0 of a width, be transferred to later computer or
Display screen, there are laps between E1, E2, E3, E4 as shown in the figure, are such as labeled as the bar-shaped zone of A, to guarantee to merge
Big figure can completely show real scene, centre is not in vacancy.
Thus the eyes of user are presented on any position (ten word locations in such as figure) of big figure E0, image processing module
It can detect human eye and carry out subsequent video procession, compared with the technical solution of the single camera of tradition, effectively
Extend acquisition plane, reduce using limitation, bring better user experience.
In conjunction with the explanation and practice of the invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (8)
1. a kind of iris capturing equipment of extended field of view range, including camera array, infrared illumination unit, control module,
It is characterized in that:
The camera array includes at least two iris cameras, and the iris camera configures the camera lens of identical image space focal length
And the imaging sensor of equal resolution；
The left and right sides or surrounding of the infrared illumination cell distribution in camera array；
The control module is made of control system, passes through USB PHY chip for composograph and by the image of synthesis
It is transmitted to computer or display equipment；
Its workflow are as follows:
S1: the camera array starts simultaneously at acquisition image；
S2: the control module receives the image data that all iris cameras acquire according to multi-data synchronous control algolithm, into
Row caching；
S3: all automatic Image Stitchings of caching are become piece image by the control module, and image data is converted to number
USB PHY chip is sent to according to frame；
S4: computer reads image data from USB PHY chip, and analyzes image data.
2. iris capturing equipment according to claim 1, which is characterized in that the iris camera passes through MIPI interface
And/or DVP interface and/or CSI interface are connect with control module respectively.
3. iris capturing equipment according to claim 1, which is characterized in that the resolution ratio of described image sensor is not less than
2Mega Pixel。
4. iris capturing equipment according to claim 1, which is characterized in that described control unit and USB PHY chip connect
It connects, the USB PHY chip is connect with RAM storage chip by universal serial bus.
5. iris capturing equipment according to claim 4, which is characterized in that the RAM storage chip is set as DDR2
SDRAM or DDR3 SDRAM.
6. iris capturing equipment according to claim 5, the RAM storage chip is set as DDR3 SDRAM.
7. a kind of method for carrying out iris capturing using iris capturing equipment described in claim 1, which is characterized in that described more
Data synchronization control algorithm is, since the 1st iris camera, what fpga chip successively acquired each iris camera
Data are cached, and every iris camera caching is waited for after completing, until the acquisition of all iris cameras
Data buffer storage is completed, and multichannel data is synthesized the big figure of a width；Later again since the 1st iris camera, successively to each
The data of iris camera acquisition are cached, and so on.
8. the method according to the description of claim 7 is characterized in that the waiting time of every iris camera acquisition data
The cache-time of data is acquired to it no more than fpga chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811540107.XA CN109684966A (en) | 2018-12-17 | 2018-12-17 | A kind of iris capturing apparatus and method for of extended field of view range |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811540107.XA CN109684966A (en) | 2018-12-17 | 2018-12-17 | A kind of iris capturing apparatus and method for of extended field of view range |
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| CN105744137A (en) * | 2016-04-22 | 2016-07-06 | 王俊懿 | System for real-time correction and splicing of image formed by fish-eye lens through using hardware circuit |
| CN107194231A (en) * | 2017-06-27 | 2017-09-22 | 上海与德科技有限公司 | Unlocking method, device and mobile terminal based on iris |
| CN107437064A (en) * | 2017-07-05 | 2017-12-05 | 北京中科虹霸科技有限公司 | Living iris detection method based on spectrum analysis |
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| CN104091165A (en) * | 2014-08-04 | 2014-10-08 | 河南华辰智控技术有限公司 | Adaptive double-iris and facial image register recognizing machine |
| CN105138996A (en) * | 2015-09-01 | 2015-12-09 | 北京上古视觉科技有限公司 | Iris identification system with living body detecting function |
| CN105744137A (en) * | 2016-04-22 | 2016-07-06 | 王俊懿 | System for real-time correction and splicing of image formed by fish-eye lens through using hardware circuit |
| CN107194231A (en) * | 2017-06-27 | 2017-09-22 | 上海与德科技有限公司 | Unlocking method, device and mobile terminal based on iris |
| CN107437064A (en) * | 2017-07-05 | 2017-12-05 | 北京中科虹霸科技有限公司 | Living iris detection method based on spectrum analysis |
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