CN106559424B - A kind of iris image encryption method, equipment and system - Google Patents
A kind of iris image encryption method, equipment and system Download PDFInfo
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- CN106559424B CN106559424B CN201611009770.8A CN201611009770A CN106559424B CN 106559424 B CN106559424 B CN 106559424B CN 201611009770 A CN201611009770 A CN 201611009770A CN 106559424 B CN106559424 B CN 106559424B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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Abstract
The invention discloses a kind of iris image encryption method, equipment and systems.In iris image encryption system of the invention, including iris video stream picture acquisition device and the calculating equipment for being populated with iris identification device.By the cooperation of iris video stream picture acquisition device and iris identification device, selectively the image for meeting image quality requirements can be encrypted in iris video stream picture, significantly reduce the requirement of the throughput performance to image encryption chip.The present invention also achieves the protection to iris image content while the real-time that ensure that iris recognition, ensure that safety of the iris image in data transmission procedure.
Description
Technical field
The present invention relates to data encryption technology field more particularly to a kind of iris image encryption method, equipment and it is
System.
Background technique
In personal identification field using increasingly extensive, the safety problem of iris image content also becomes iris recognition
It is more and more important.In being currently being widely used portable iris identifying system, the acquisition of human eye iris image acquired equipment with
Afterwards, it is transferred in computer or other calculating equipment by acquiring the usb data output interface of equipment, is further schemed
It as processing, analysis and compares, finally obtains recognition result.It is collected on the path of entire iris image acquiring and transmission
Iris image is all place and not encrypted state (plaintext state), there is the risk for being stolen and distorting.
In view of the above problems, existing technical solution is, before video streaming image data enter data transmission channel, use
Encryption chip encrypts data, and encrypted data are then carried out package, is sent into data transmission channel.Though above method
It simply and is easily achieved, but is not able to satisfy the requirement in iris recognition to data throughout and processing time.Under normal conditions,
Video flowing/image data volume of iris recognition camera head acquisition is quite big.By 30 frame image per second, each image 2MB is calculated,
It is even higher that data throughout can achieve 480M bps.In addition, an iris recognition generally requires to complete in 1-2 seconds.By
A large amount of calculating is needed in data ciphering and deciphering, the performance of existing conventional data encryption chip is difficult to meet the above handling capacity
With the temporal requirement of processing, the performance of iris authentication system is limited.
Summary of the invention
For this purpose, the present invention provides a kind of iris image encryption method, equipment and system, to try hard to solve or at least
Alleviate above there are the problem of.
According to an aspect of the present invention, a kind of iris image encryption method is provided, is adopted in iris video stream picture
It is executed in acquisition means, this method comprises: obtaining the first image, the first image is the iris image of present frame in video flowing；
The first image is saved to core buffer；Down-sampled processing is carried out to the first image, obtains the second image；By institute
It states the second image and is sent to iris identification device in plain text；The iris identification device is received for the quality of second image
Judging result；If the judging result indicates that the quality of second image is unsatisfactory for requiring, by the second image of next frame
It is sent to the iris identification device in plain text, receives the iris identification device for the quality of the second image of the next frame
Judging result；If the judging result indicates that the quality of second image is met the requirements, taken out from core buffer
First image corresponding to second image, encrypts the first image, and encrypted image data is sent
To the iris identification device.
Optionally, in iris image encryption method according to the present invention, core buffer is round-robin queue.
Optionally, in iris image encryption method according to the present invention, the capacity of core buffer is according to following
Formula determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every frame the in video flowing
The interval time of one image, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,It indicates
It is rounded downwards.
Optionally, in iris image encryption method according to the present invention, the first image is carried out down-sampled
The step of processing includes: the down-sampled coefficient k of setting；The lateral dimension of the first image and longitudinal size are reduced into former ruler
Very little 1/k.
Optionally, in iris image encryption method according to the present invention, the first image is carried out down-sampled
The step of processing includes: setting laterally down-sampled coefficient k1With longitudinal down-sampled coefficient k2；By the lateral dimension of the first image
It is reduced into the 1/k of full size1, longitudinal size is reduced into the 1/k of full size2。
According to an aspect of the present invention, a kind of iris video stream picture acquisition device is provided, comprising: imaging sensor,
Suitable for acquiring the first image, the first image is iris image；Core buffer is suitable for the first image of caching；Image procossing
Device is suitable for carrying out down-sampled processing to the first image, obtains the second image；Encryption chip, suitable for being encrypted to the first image；
And first communication module, the first communication module include USB interface, suitable for the calculating equipment including iris identification device
It is communicated.
Optionally, in iris video stream picture acquisition device according to the present invention, core buffer is round-robin queue.
Optionally, in iris video stream picture acquisition device according to the present invention, the capacity of core buffer according to
Lower formula determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every frame the in video flowing
The interval time of one image, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,It indicates
It is rounded downwards.
Optionally, in iris video stream picture acquisition device according to the present invention, image processor is further adapted for: being set
Set down-sampled coefficient k；The lateral dimension of first image and longitudinal size are reduced into the 1/k of full size.
Optionally, in iris video stream picture acquisition device according to the present invention, image processor is further adapted for: being set
Set laterally down-sampled coefficient k1With longitudinal down-sampled coefficient k2；The lateral dimension of first image is reduced into the 1/k of full size1, indulge
It is the 1/k of full size to size reduction2。
Optionally, in iris video stream picture acquisition device according to the present invention, first communication module passes through extension
UVC agreement is communicated with the calculating equipment including iris identification device.
Optionally, in iris video stream picture acquisition device according to the present invention, first communication module is further adapted for:
The second image is sent in plain text to iris identification device；The quality that the iris identification device is received for second image is sentenced
Disconnected result；It is bright to iris identification device and when the judging result indicates that the quality of second image is unsatisfactory for requiring
Text sends the second image of next frame；When the judging result indicates that the quality of second image is met the requirements, Xiang Suoshu
Iris identification device, which is sent, carries out encrypted image data for corresponding first image of second image.
According to an aspect of the present invention, a kind of iris image encryption method is provided, is held in iris identification device
Row, this method comprises: receiving the second image that iris video stream picture acquisition device is sent in plain text, second image is to the
One image carries out the down-sampled obtained image of processing, wherein the first image is the iris image of present frame in video flowing；
The quality information for extracting the second image judges according to quality of the quality information to second image, obtains judgement
As a result；The judging result is sent to the iris video stream picture acquisition device；If judging result instruction described the
The quality of two images is unsatisfactory for requiring, then receives the second figure of the next frame that iris video stream picture acquisition device is sent in plain text
Picture, extracts the quality information of the second image of next frame, and according to the quality information to the second image of the next frame
Quality is judged, obtains judging result；If the judging result indicates that the quality of second image is met the requirements, receive
The encrypted image data that the iris video stream picture acquisition device is sent, the encrypted image data are to second image
Corresponding first image carries out encrypting obtained image data.
Optionally, in iris image encryption method according to the present invention, the quality information of the second image include with
One of lower project is a variety of: the clarity of the second image, contrast, signal-to-noise ratio；The radius of iris, eyes in second image
The distance of interocular distance, human eye to the iris video stream picture acquisition device.
Optionally, in iris image encryption method according to the present invention, according to the quality information to described
The step of quality of two images is judged, obtains judging result further comprises: obtaining the normal of each quality information project
It is worth range；Judge whether that the value of the quality information project of each second image is in the normal of the quality information project
It is worth in range, if so, output indicates the judging result that the quality of second image is met the requirements, if it is not, then exporting instruction
The quality of second image is unsatisfactory for desired judging result.
Optionally, in iris image encryption method according to the present invention, the iris video stream picture is being received
After the step of encrypted image data that acquisition device is sent, further includes: be decrypted to the encrypted image data, recover institute
State the first image；Iris recognition is carried out to the first image.
According to an aspect of the present invention, a kind of iris identification device is provided, resides at and calculates in equipment, the device packet
It includes: second communication module, the second image sent in plain text suitable for receiving iris video stream picture acquisition device, second image
To carry out the down-sampled obtained image of processing to the first image, wherein the first image is the rainbow of present frame in video flowing
Film image；Picture quality judgment module, suitable for extracting the quality information of the second image, according to the quality information to described second
The quality of image is judged, obtains judging result；Wherein, the second communication module is further adapted for: the judging result is sent out
It send to the iris video stream picture acquisition device；If the judging result indicates that the quality of second image is unsatisfactory for wanting
It asks, then receives the second image of the next frame that iris video stream picture acquisition device is sent in plain text, and further transfer to image matter
The quality information that judgment module extracts the second image of next frame is measured, and according to the quality information to the second of the next frame
The quality of image is judged, obtains judging result；If the judging result indicates that the quality of second image is met the requirements,
Then receive the encrypted image data that the iris video stream picture acquisition device is sent, the encrypted image data is to described the
Corresponding first image of two images carries out encrypting obtained image data.
Optionally, in iris identification device according to the present invention, the quality information of the second image includes in following items
It is one or more: the clarity of the second image, contrast, signal-to-noise ratio；In second image between the radius of iris, pupil of both eyes
Distance away from, human eye to the iris video stream picture acquisition device.
Optionally, in iris identification device according to the present invention, picture quality judgment module is further adapted for: being obtained every
The range of normal value of a quality information project；Judge whether that the value of the quality information project of each second image is in
In the range of normal value of the quality information project, if so, output indicates the judgement that the quality of second image is met the requirements
As a result, indicating that the quality of second image is unsatisfactory for desired judging result if it is not, then exporting.
Optionally, in iris identification device according to the present invention, further includes: image decryption module is suitable for adding to described
Close image data is decrypted, and recovers the first image；And iris recognition module, it is suitable for carrying out the first image
Iris recognition.
According to an aspect of the present invention, a kind of calculating equipment is provided, comprising: USB interface and iris as described above
Identification device.
According to an aspect of the present invention, a kind of iris image encryption system is provided, comprising: iris as described above
Video streaming image acquisition device and equipment is calculated as described above.
The technical solution provided according to the present invention passes through matching for iris video stream picture acquisition device and iris identification device
It closes, selectively the image for meeting image quality requirements can be encrypted in iris video stream picture, be effectively reduced
Requirement to the throughput performance of image encryption chip.The present invention is also real while the real-time that ensure that iris recognition
Show the protection to iris image content, ensure that safety of the iris image in data transmission procedure.
Detailed description of the invention
To the accomplishment of the foregoing and related purposes, certain illustrative sides are described herein in conjunction with following description and drawings
Face, these aspects indicate the various modes that can practice principles disclosed herein, and all aspects and its equivalent aspect
It is intended to fall in the range of theme claimed.Read following detailed description in conjunction with the accompanying drawings, the disclosure it is above-mentioned
And other purposes, feature and advantage will be apparent.Throughout the disclosure, identical appended drawing reference generally refers to identical
Component or element.
Fig. 1 shows the schematic diagram of the iris image encryption system 100 of one embodiment of the invention；
Fig. 2 shows the structure charts of the iris video stream picture acquisition device 200 of one embodiment of the invention；
Fig. 3 shows the structure chart of the iris identification device 300 of one embodiment of the invention；
Fig. 4 shows the iris image number of one embodiment of the invention executed in iris video stream picture acquisition device
According to the flow chart of encryption method 400；
Fig. 5 shows the iris image encryption method of one embodiment of the invention executed in iris identification device
500 flow chart.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
Fig. 1 shows the schematic diagram of the iris image encryption system 100 of one embodiment of the invention.As shown in Figure 1,
Iris image encryption system 100 includes iris video stream picture acquisition device 200 and is populated with iris identification device 300
Calculate equipment 400.Iris video stream picture acquisition device 200 can be to any video flowing including USB interface on the market
Device obtained from image capture device improves.Iris video stream picture acquisition device 200 is relative to existing on the market
Video streaming image acquires for equipment, increases core buffer and encryption chip, meanwhile, in order to adapt to newly-increased memory buffer
The function in area and encryption chip correspondingly has modified the driver of video flowing acquisition equipment.Iris video stream picture acquisition dress
The specific structure and function for setting 200 will hereinafter be described.
Calculating equipment 400 can be desktop computer, laptop, server or work station.Equipment 400 is calculated may be used also
To be embodied as portable (or mobile) electronic equipment of small size, such as mobile phone, tablet computer, personal media player device, nothing
Line network browsing device, wearable device, or the mixing apparatus including any of the above function.In order to realize figure of the invention
As data encryption feature, calculates in equipment 400 and be populated with iris identification device 300.Iris identification device 300 can be used as one
Independent application program, which is installed on, to be calculated in equipment 400, be can also be used as a plug-in unit and is installed on the browser for calculating equipment 400
In, calculating the existence form in equipment 400, there is no restriction to iris identification device 300 by the present invention.
Iris video stream picture acquisition device 200 and calculating equipment 400 include USB interface, and the two can pass through extension
UVC (USB Video Class) agreement communicated.In a further embodiment, iris video stream picture acquisition device
200 and/or to calculate equipment 400 do not include USB interface, but it can be made it have by way of installation data patchcord
USB interface.In the present invention, the equipment that do not had into USB interface but USB interface can be made it have by data switch line itself
Also it is considered as with USB interface.That is, the USB interface in the present invention includes the USB interface that equipment itself has and is turned by data
Two kinds of situations of USB interface that wiring obtains hereafter no longer distinguish the two to describe conveniently, and are referred to as that " USB connects
Mouthful ".
Image data is sent to calculating equipment by the UVC agreement extended by iris video stream picture acquisition device 200
400, the image data can be obtained from the memory for calculating equipment 400 by calculating the iris identification device 300 in equipment 400,
And image data is analyzed and processed, processing result is fed back into iris by the UVC agreement extended via calculating equipment 400
Video streaming image acquisition device 200.Iris video stream picture acquisition device 200 and iris identification device 300 are passes of the invention
Key, the two, which cooperates, realizes the selectively encryption of the iris video stream picture arrived to continuous acquisition, calculates equipment 400
The communication media that an auxiliary iris video stream picture acquisition device 200 and iris identification device 300 are communicated is just corresponded to,
Key effect is not undertaken in the present invention.In order to describe conveniently, hereinafter, by iris video stream picture acquisition device
200 are described as iris video stream picture acquisition dress via the process that equipment 400 is communicated with iris identification device 300 is calculated
Set the direct communication of 200 Yu iris identification device 300.
Fig. 2 shows the structure charts of the iris video stream picture acquisition device 200 of one embodiment of the invention.Such as Fig. 2 institute
Show, iris video stream picture acquisition device 200 includes imaging sensor 210, core buffer 220, image processor 230, adds
Close chip 240 and first communication module 250.
Fig. 3 shows the structure chart of the iris identification device 300 of one embodiment of the invention.As shown in figure 3, iris recognition
Device 300 includes second communication module 310, picture quality judgment module 320, image decryption module 330 and iris recognition module
340。
Imaging sensor 210 is suitable for acquisition iris image, for the ease of narration, the original rainbow that imaging sensor is acquired
Film image is denoted as the first image.
Core buffer 220 is suitable for the first image of caching.After imaging sensor 210 collects the first image, by this
One image is stored in core buffer.Core buffer uses the design (i.e. queue) of first in, first out, is suitable for interim storage a part
First image deletes the first image (the be stored at first of core buffer head storage when core buffer has been expired
One image), by the tail portion of new first image deposit core buffer.According to a kind of embodiment, core buffer is circulation
Queue, the memory headroom for fixed size that it can be used repeatedly do not need to carry out dynamic memory release and distribution.
Image processor 230 is suitable for carrying out down-sampled processing to the first image, obtains the second image.Specifically, first
Down-sampled coefficient is set, then the first image is carried out according to down-sampled coefficient down-sampled.Down-sampled coefficient can be directed to whole
The first image can also be directed to the lateral dimension and longitudinal size of the first image respectively.For example, it is directed to the first image of whole picture,
Down-sampled coefficient k is set, if the Pixel Dimensions of the first image are that (N indicates the number of horizontal pixel to N*M, and M indicates longitudinal pixel
Number), then the size of the second image is (N/k) * (M/k).According to another embodiment, lateral dimension for the first image and
Laterally down-sampled coefficient k is respectively set in longitudinal size1With longitudinal down-sampled coefficient k2If the size of the first image is N*M, the
The size of two images is (N/k1)*(M/k2)。
Iris video stream picture acquisition device 200 and calculating equipment 400 all have USB interface.When image processor 230 obtains
Out after the second image, the second image is sent to iris identification device by the UVC agreement of extension by first communication module 250 in plain text
300.The reason of second image is carried out plaintext transmission mainly has following two points: 1) retaining the part of the first image in the second image
Image quality information selects suitable first image to carry out so that iris identification device 300 carries out Quality estimation to the second image
Encryption.2) the first image by it is appropriate it is down-sampled after, the grain details of iris have considerable degree of loss.Even if in plain text
In transmission process, the second image is intercepted and captured by attacker, and attacker, which can not also recover, has the of complete iris feature information
Second image progress plaintext transmission is saved calculation resources (because without encryption), is also effectively guaranteed iris by one image
The safety of data.
The UVC agreement of described extension, which refers to be extended on the basis of standard UV C agreement, in the present invention obtains
Image data transport protocol.The UVC agreement of extension supports the institute of standard UV C agreement functional, and it is slow to be added to reading memory
Rush data, the transmission functions such as data encryption image and command signal in area.The UVC agreement of standard can support a variety of data formats
With the transmission of the image data of sizes.For example, the data format that the UVC agreement of standard is supported includes YUV, MJPEG etc., branch
The picture size held includes 320x240,640x480,1280x1024,1920x1080 etc..It is 1920x1080 for original size
The first image, (can be obtained after down-sampled according to the picture size that the UVC agreement of standard is supported down-sampled coefficient is arranged
The size of the second image should be the size that standard UV C agreement is supported).For example, setting 6 for laterally down-sampled coefficient, indulge
Be set as 4.5 to down-sampled coefficient, then to the first image carry out it is down-sampled after the obtained size of the second image be 320x240.
According to the UVC agreement of standard, down-sampled coefficient can be there are many selection, and still, down-sampled coefficient is bigger, and the first image switchs to the
The quality information of two image impairments is more, is more unfavorable for subsequent iris identification device 300 and carries out Quality estimation to the second image；Drop
Downsampling factor is smaller, and the iris texture characteristic of the first image retained in the second image is more, when attacker intercepts and captures the second image
When, that is, it is possible to complete first image at recovery, to jeopardize the safety of iris data.Those skilled in the art are being arranged
When down-sampled coefficient, information above should be comprehensively considered, realize the iris texture characteristic of fuzzy first image and retained enough
Balance between iris image quality information.
Second image is sent to iris identification device 300 by the UVC agreement of extension by first communication module 250 in plain text
Afterwards, the second communication module 310 of iris identification device 300 receives second image, and passes it to picture quality and judge mould
Block 320.Picture quality judgment module 320 is suitable for extracting the quality information of the second image, and according to the quality information to described
The quality of second image is judged, obtains judging result.The quality information of second image includes but is not limited to following items: the
The clarity of two images, contrast, signal-to-noise ratio；The radius of iris, pupil of both eyes spacing, the human eye being calculated in second image
To the distance of iris video stream picture acquisition device.Picture quality judgment module 320 obtains every first when carrying out Quality estimation
The range of normal value of a quality information project.For example, for quality such as clarity, contrast, signal-to-noise ratio, iris radius, interpupillary distances
Information project has corresponding range of normal value [a respectivelyi,bi] (i=1,2 ..., 5), human eye is adopted to iris video stream picture
The distance of acquisition means, range of normal value are the field depth of the camera of iris video stream picture acquisition device.If the second figure
The value of each quality information project of picture is in the range of normal value of the quality information project, then picture quality judges mould
The output of block 320 indicates the judging result that the quality of second image is met the requirements；Otherwise, then instruction second image is exported
Quality be unsatisfactory for require judging result.
After picture quality judgment module 320 obtains the judging result to the second picture quality, second communication module 310 should
Judging result is sent to iris video stream picture acquisition device 200, by the first communication of iris video stream picture acquisition device 200
Module 250 receives the judging result.
If judging result indicates that the quality of the second image is unsatisfactory for requiring, image processor 230 is from core buffer 220
Middle the first image for taking out next frame carries out down-sampled processing to the first image of next frame, obtains the second image of next frame.
Then, the second image of next frame is sent to iris identification device 300 again by first communication module 250, by iris identification device
The quality of second image of 300 pairs of next frames judges, and judging result is sent to iris video stream picture acquisition dress
Set 200.
If judging result indicates that the quality of the second image is met the requirements, second figure is taken out from core buffer 220
As corresponding first image, first image is encrypted by encryption chip 240, Encryption Algorithm can be any image encryption and calculate
Method, such as pixel evolution Encryption Algorithm, compressed encoding Encryption Algorithm, two dimensional image first switched into one-dimensional data again to one-dimensional
Data carry out the algorithm, etc. of conventional encryption, and the resume image that the present invention uses encryption chip 240 is with no restrictions.
Under normal circumstances, picture quality judgment module 320 completes time meeting used in the Quality estimation to the second image
Greater than the interval time that iris video stream picture acquisition device 200 acquires every frame image.It is carried out in picture quality judgment module 320
During the Quality estimation of second image, meeting the first image of continuous collecting of iris video stream picture acquisition device 200, and be stored in
Core buffer 220.In order to guarantee that memory is slow after picture quality judgment module 320 completes the Quality estimation to the second image
It rushes in area 220 and still has corresponding first image of second image, the capacity to core buffer 220 is needed to be designed.Tool
For body, the capacity of core buffer 220 depends on the completion of picture quality judgment module 320 to the Quality estimation institute of the second image
Time, iris video stream picture acquisition device 200 acquire the data of the first image of interval time and every frame of every frame image
Amount.The capacity of core buffer 220 can be calculated according to following formula:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every frame the in video flowing
The interval time of one image, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,It indicates
It is rounded downwards.For example, the data volume of the first image is 2MB, i.e. d=2MB, the energy per second of iris video stream picture acquisition device 200
30 the first images of frame are acquired, i.e., the interval time of every the first image of frame is 33ms, i.e. t in video flowing1=33ms, iris recognition dress
Setting the time used in the Quality estimation completed to the second image is 100ms, i.e. t2=100ms.Then by formula (1), C=is calculated
8MB, i.e., in the above conditions, core buffer 220 can should at least cache 4 the first images of frame.
After encryption chip 240 is completed to the encryption of the first image, encrypted image data is sent to iris recognition dress
300 are set, the second communication module 310 of iris identification device 300 receives the image data of the encryption, and transfers to image decryption module
330 are decrypted encrypted image data, recover the first image, then carried out to first image by iris recognition module 340
Subsequent iris recognition work.
The present invention carries out Quality estimation to the second image by picture quality judgment module 320, to filter out comprising closing
Then first image of key iris feature information encrypts these first images for including crucial iris feature information, from
And avoid and data all in video flowing are encrypted, it reduces to effect and the throughput performance of image encryption chip is wanted
It asks.This method is also to be of practical significance very much, because in practical applications, due to various reasons, iris video stream picture is adopted
It is the requirement for not meeting Algorithm of Iris Recognition to picture quality that the collected iris image of acquisition means, which has quite a few, such as
The slight movement of user's head causes image fuzzy, and blink process causes eyes closed in image that can not detect iris, etc..
In this case, selective encryption scheme of the invention can significantly reduce the requirement to the handling capacity of encryption chip.By per second
30 frame images, each image 2MB is calculated, if encrypted to all images, the data throughout of encryption chip can be with
It is even higher to reach 480M bps.And technical solution according to the invention, if can collect a width in 500 milliseconds and meet figure
As the first image of quality requirement, then the requirement of encryption chip handling capacity is in 32Mbps or so, even if increasing more than 1 times of safety
Amount, the requirement of handling capacity i.e. 64Mbps are still much smaller than in conventional method to the 480M bps handling capacity of encryption chip
It is required that.
Fig. 4 shows the iris image number of one embodiment of the invention executed in iris video stream picture acquisition device
According to the flow chart of encryption method 400.As shown in figure 4, this method is suitable for step S410.
In step S410, the first image is obtained.Wherein, the first image is the iris image of present frame in video flowing.
Then, in the step s 420, the first image is saved to core buffer.According to a kind of embodiment, memory buffer
Round-robin queue, area, capacity can be determined according to aforementioned formula (1).
Then, in step S430, down-sampled processing is carried out to the first image, obtains the second image.It is specific down-sampled
Process can refer to the aforementioned description to image processor 230, and details are not described herein again.
Then, in step S440, the second image is sent to iris identification device in plain text.
Then, in step S450, iris identification device is received for the judging result of the quality of the second image.
Then, in step S460, judge whether the judging result indicates that the quality of the second image is met the requirements.If it is not,
S470 is thened follow the steps, the second image of next frame is sent to iris identification device in plain text, iris identification device is received and is directed to
The judging result of the quality of second image of next frame.If so, thening follow the steps S480, the second figure is taken out from core buffer
As the first corresponding image, which is encrypted, and encrypted image data is sent to iris recognition dress
It sets.
Fig. 5 shows the iris image encryption method of one embodiment of the invention executed in iris identification device
500 flow chart.As shown in figure 5, this method starts from step S510.
In step S510, the second image that iris video stream picture acquisition device is sent in plain text is received.Wherein, the second figure
As to carry out the down-sampled obtained image of processing to the first image, the first image is the iris image of present frame in video flowing.
Then, in step S520, the quality information of the second image is extracted, according to quality information to the quality of the second image
Judged, obtains judging result.The project of quality information and the process of specific Quality estimation can refer to aforementioned to image
The description of Quality estimation module 320, details are not described herein again.
Then, in step S530, judging result is sent to iris video stream picture acquisition device.
Then, in step S540, judge whether the judging result indicates that the quality of the second image is met the requirements.If it is not,
S550 is thened follow the steps, the second image of the next frame that iris video stream picture acquisition device is sent in plain text is received, is extracted next
The quality information of second image of frame, and judged according to quality of the quality information to the second image of next frame, it obtains and sentences
Disconnected result.If so, thening follow the steps S560, the encrypted image data that iris video stream picture acquisition device is sent is received.
It further include step S570 and S580 (being not shown in Fig. 5) after step S560 according to a kind of embodiment.In step
In S570, the encrypted image data received is decrypted, recovers the first image.In step S580, to step S570
In the first image for recovering carry out iris recognition.
The technical solution provided according to the present invention passes through matching for iris video stream picture acquisition device and iris identification device
It closes, selectively the image for meeting image quality requirements can be encrypted in iris video stream picture, be effectively reduced
Requirement to the throughput performance of image encryption chip.The present invention is also real while the real-time that ensure that iris recognition
Show the protection to iris image content, ensure that safety of the iris image in data transmission procedure.
Iris image encryption method described in A3:A1, wherein the capacity of the core buffer is according to following formula
It determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every frame the in video flowing
The interval time of one image, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,It indicates
It is rounded downwards.
Iris image encryption method described in A4:A1, wherein the step of down-sampled processing is carried out to the first image
It suddenly include: the down-sampled coefficient k of setting；The lateral dimension of the first image and longitudinal size are reduced into the 1/k of full size.
Iris image encryption method described in A5:A1, wherein the step of down-sampled processing is carried out to the first image
It suddenly include: setting laterally down-sampled coefficient k1With longitudinal down-sampled coefficient k2；The lateral dimension of the first image is reduced into original
The 1/k of size1, longitudinal size is reduced into the 1/k of full size2。
Iris video stream picture acquisition device described in B8:B6, wherein the capacity of the core buffer is according to following public affairs
Formula determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every frame the in video flowing
The interval time of one image, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,It indicates
It is rounded downwards.
Iris video stream picture acquisition device described in B9:B6, wherein described image processor is further adapted for: setting
Down-sampled coefficient k；The lateral dimension of first image and longitudinal size are reduced into the 1/k of full size.
Iris video stream picture acquisition device described in B10:B6, wherein described image processor is further adapted for: setting
Laterally down-sampled coefficient k1With longitudinal down-sampled coefficient k2；The lateral dimension of first image is reduced into the 1/k of full size1, longitudinal
Size reduction is the 1/k of full size2。
Iris video stream picture acquisition device described in B11:B5, wherein the UVC that the first communication module passes through extension
Agreement is communicated with the calculating equipment including iris identification device.
Iris video stream picture acquisition device described in B12:B11, wherein the first communication module is further adapted for:
The second image is sent in plain text to iris identification device；The quality that the iris identification device is received for second image is sentenced
Disconnected result；It is bright to iris identification device and when the judging result indicates that the quality of second image is unsatisfactory for requiring
Text sends the second image of next frame；When the judging result indicates that the quality of second image is met the requirements, Xiang Suoshu
Iris identification device, which is sent, carries out encrypted image data for corresponding first image of second image.
Iris image encryption method described in C15:C14, wherein according to the quality information to second image
Quality the step of being judged, obtaining judging result further comprise: obtain the range of normal value of each quality information project；
Judge whether that the value of the quality information project of each second image is in the range of normal value of the quality information project
It is interior, if so, output indicates the judging result that the quality of second image is met the requirements, if it is not, then exporting instruction described the
The quality of two images is unsatisfactory for desired judging result.
Iris image encryption method described in C16:C13, wherein receiving the iris video stream picture acquisition dress
After the step of setting the encrypted image data of transmission, further includes: be decrypted to the encrypted image data, recover described first
Image；Iris recognition is carried out to the first image.
Iris identification device described in D19:D18, wherein described image Quality estimation module is further adapted for: it obtains every
The range of normal value of a quality information project；Judge whether that the value of the quality information project of each second image is in
In the range of normal value of the quality information project, if so, output indicates the judgement that the quality of second image is met the requirements
As a result, indicating that the quality of second image is unsatisfactory for desired judging result if it is not, then exporting.
Iris identification device described in D20:D17, wherein further include: image decryption module is suitable for the encrypted image
Data are decrypted, and recover the first image；And iris recognition module, it is suitable for carrying out iris knowledge to the first image
Not.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be practiced without these specific details.In some instances, well known method, knot is not been shown in detail
Structure and technology, so as not to obscure the understanding of this specification.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of the various inventive aspects, In
Above in the description of exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention: i.e. required to protect
Shield the present invention claims than feature more features expressly recited in each claim.More precisely, as following
As claims reflect, inventive aspect is all features less than single embodiment disclosed above.Therefore, it abides by
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
As a separate embodiment of the present invention.
Those skilled in the art should understand that the module of the equipment in example disclosed herein or unit or groups
Part can be arranged in equipment as depicted in this embodiment, or alternatively can be positioned at and the equipment in the example
In different one or more equipment.Module in aforementioned exemplary can be combined into a module or furthermore be segmented into multiple
Submodule.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment claimed is appointed
Meaning one of can in any combination mode come using.
In addition, be described as herein can be by the processor of computer system or by executing by some in the embodiment
The combination of method or method element that other devices of the function are implemented.Therefore, have for implementing the method or method
The processor of the necessary instruction of element forms the device for implementing this method or method element.In addition, Installation practice
Element described in this is the example of following device: the device be used for implement as in order to implement the purpose of the invention element performed by
Function.
As used in this, unless specifically stated, come using ordinal number " first ", " second ", " third " etc.
Description plain objects, which are merely representative of, is related to the different instances of similar object, and is not intended to imply that the object being described in this way must
Must have the time it is upper, spatially, sequence aspect or given sequence in any other manner.
Although the embodiment according to limited quantity describes the present invention, above description, the art are benefited from
It is interior it is clear for the skilled person that in the scope of the present invention thus described, it can be envisaged that other embodiments.Additionally, it should be noted that
Language used in this specification primarily to readable and introduction purpose and select, rather than in order to explain or limit
Determine subject of the present invention and selects.Therefore, without departing from the scope and spirit of the appended claims, for this
Many modifications and changes are obvious for the those of ordinary skill of technical field.For the scope of the present invention, to this
Invent done disclosure be it is illustrative and not restrictive, it is intended that the scope of the present invention be defined by the claims appended hereto.
Claims (21)
1. a kind of iris image encryption method executes in iris video stream picture acquisition device, this method comprises:
The first image is obtained, the first image is the iris image of present frame in video flowing；
The first image is saved to core buffer；
Down-sampled processing is carried out to the first image, obtains the second image；
Second image is sent to iris identification device in plain text；
The iris identification device is received for the judging result of the quality of second image；
If the judging result indicates that the quality of second image is unsatisfactory for requiring, the second image of next frame is sent out in plain text
It send to the iris identification device, receives the iris identification device for the judgement of the quality of the second image of the next frame
As a result；
If the judging result indicates that the quality of second image is met the requirements, described second is taken out from core buffer
The first image, encrypts the first image corresponding to image, and encrypted image data is sent to the rainbow
Film identification device.
2. iris image encryption method as described in claim 1, wherein the core buffer is round-robin queue.
3. iris image encryption method as described in claim 1, wherein the capacity of the core buffer is according to following
Formula determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every the first figure of frame in video flowing
The interval time of picture, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,Indicate downward
It is rounded.
4. iris image encryption method as described in claim 1, wherein carry out down-sampled processing to the first image
The step of include:
Down-sampled coefficient k is set；
The lateral dimension of the first image and longitudinal size are reduced into the 1/k of full size.
5. iris image encryption method as described in claim 1, wherein carry out down-sampled processing to the first image
The step of include:
The lateral down-sampled coefficient k of setting1With longitudinal down-sampled coefficient k2；
The lateral dimension of the first image is reduced into the 1/k of full size1, longitudinal size is reduced into the 1/k of full size2。
6. a kind of iris video stream picture acquisition device, comprising:
Imaging sensor is suitable for the first image of acquisition, and the first image is iris image；
Core buffer is suitable for the first image of caching；
Image processor is suitable for carrying out down-sampled processing to the first image, obtains the second image；
Encryption chip, suitable for being encrypted to the first image；And
First communication module, the first communication module include USB interface, suitable for the calculating equipment including iris identification device
It is communicated, and is further adapted for:
The second image is sent in plain text to iris identification device；
The iris identification device is received for the judging result of the quality of second image；And
When the judging result indicates that the quality of second image is unsatisfactory for requiring, under being sent in plain text to iris identification device
Second image of one frame；When the judging result indicates that the quality of second image is met the requirements, Xiang Suoshu iris recognition
Device, which is sent, carries out encrypted image data for corresponding first image of second image.
7. iris video stream picture acquisition device as claimed in claim 6, wherein the core buffer is round-robin queue.
8. iris video stream picture acquisition device as claimed in claim 6, wherein the capacity of the core buffer according to
Lower formula determines:
Wherein, C indicates that the capacity of core buffer, d indicate the data volume of the first image, t1Indicate every the first figure of frame in video flowing
The interval time of picture, t2Indicate the time used in Quality estimation of the iris identification device completion to the second image,Indicate downward
It is rounded.
9. iris video stream picture acquisition device as claimed in claim 6, wherein described image processor is further adapted for:
Down-sampled coefficient k is set；
The lateral dimension of first image and longitudinal size are reduced into the 1/k of full size.
10. iris video stream picture acquisition device as claimed in claim 6, wherein described image processor is further adapted for:
The lateral down-sampled coefficient k of setting1With longitudinal down-sampled coefficient k2；
The lateral dimension of first image is reduced into the 1/k of full size1, longitudinal size is reduced into the 1/k of full size2。
11. iris video stream picture acquisition device as claimed in claim 6, wherein the first communication module passes through extension
UVC agreement communicated with the calculating equipment including iris identification device.
12. a kind of iris image encryption method, executes in iris identification device, this method comprises:
The second image that iris video stream picture acquisition device is sent in plain text is received, second image is to carry out to the first image
The down-sampled obtained image of processing, wherein the first image is the iris image of present frame in video flowing；
The quality information for extracting the second image judges according to quality of the quality information to second image, obtains
Judging result；
The judging result is sent to the iris video stream picture acquisition device；
If the judging result indicates that the quality of second image is unsatisfactory for requiring, iris video stream picture acquisition dress is received
The second image for setting the next frame sent in plain text extracts the quality information of the second image of next frame, and is believed according to the quality
Breath judges the quality of the second image of the next frame, obtains judging result；
If the judging result indicates that the quality of second image is met the requirements, the iris video stream picture acquisition is received
The encrypted image data that device is sent, the encrypted image data are to encrypt to corresponding first image of second image
Obtained image data.
13. iris image encryption method as claimed in claim 12, wherein the quality information of second image includes
One of following items are a variety of:
The clarity of second image, contrast, signal-to-noise ratio；
The distance of the radius of iris, pupil of both eyes spacing, human eye to the iris video stream picture acquisition device in second image.
14. iris image encryption method as claimed in claim 13, wherein according to the quality information to described second
The step of quality of image is judged, obtains judging result further comprises:
Obtain the range of normal value of each quality information project；
Judge whether that the value of the quality information project of each second image is in the normal value of the quality information project
In range, if so, output indicates the judging result that the quality of second image is met the requirements, if it is not, then exporting instruction institute
The quality for stating the second image is unsatisfactory for desired judging result.
15. iris image encryption method as claimed in claim 12, wherein adopted receiving the iris video stream picture
After the step of encrypted image data that acquisition means are sent, further includes:
The encrypted image data is decrypted, the first image is recovered；
Iris recognition is carried out to the first image.
16. a kind of iris identification device is resided at and calculated in equipment, which includes:
Second communication module, the second image sent in plain text suitable for receiving iris video stream picture acquisition device, second figure
As for the down-sampled obtained image of processing of the first image progress, wherein the first image is present frame in video flowing
Iris image；
Picture quality judgment module, suitable for extracting the quality information of the second image, according to the quality information to second figure
The quality of picture is judged, obtains judging result；
Wherein, the second communication module is further adapted for:
The judging result is sent to the iris video stream picture acquisition device；
If the judging result indicates that the quality of second image is unsatisfactory for requiring, iris video stream picture acquisition dress is received
The second image of the next frame sent in plain text is set, and further transfers to the second image of picture quality judgment module extraction next frame
Quality information, and judged according to quality of the quality information to the second image of the next frame, obtain judgement knot
Fruit；
If the judging result indicates that the quality of second image is met the requirements, the iris video stream picture acquisition is received
The encrypted image data that device is sent, the encrypted image data are to encrypt to corresponding first image of second image
Obtained image data.
17. iris identification device as claimed in claim 16, wherein the quality information of second image includes following items
One of or it is a variety of:
The clarity of second image, contrast, signal-to-noise ratio；
The distance of the radius of iris, pupil of both eyes spacing, human eye to the iris video stream picture acquisition device in second image.
18. iris identification device as claimed in claim 17, wherein described image Quality estimation module is further adapted for:
Obtain the range of normal value of each quality information project；
Judge whether that the value of the quality information project of each second image is in the normal value of the quality information project
In range, if so, output indicates the judging result that the quality of second image is met the requirements, if it is not, then exporting instruction institute
The quality for stating the second image is unsatisfactory for desired judging result.
19. iris identification device as claimed in claim 16, wherein further include:
Image decryption module recovers the first image suitable for the encrypted image data is decrypted；And
Iris recognition module is suitable for carrying out iris recognition to the first image.
20. a kind of calculating equipment, comprising:
USB interface；And
Iris identification device as described in any one of claim 16-19.
21. a kind of iris image encryption system, comprising:
Iris video stream picture acquisition device as described in any one of claim 6-11；And
It is as claimed in claim 20 to calculate equipment.
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| CN110929576B (en) * | 2019-10-23 | 2022-11-11 | 珠海研果科技有限公司 | Face recognition method and device based on UVC protocol |
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