KR101635602B1 - Method and apparatus for iris scanning - Google Patents
Method and apparatus for iris scanning Download PDFInfo
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- KR101635602B1 KR101635602B1 KR1020150130404A KR20150130404A KR101635602B1 KR 101635602 B1 KR101635602 B1 KR 101635602B1 KR 1020150130404 A KR1020150130404 A KR 1020150130404A KR 20150130404 A KR20150130404 A KR 20150130404A KR 101635602 B1 KR101635602 B1 KR 101635602B1
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- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
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- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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Abstract
Description
The present invention relates to a user authentication method and apparatus, and more particularly, to a iris recognition method and apparatus.
With the rise of information security and importance of security, people 's interest in biometrics has increased, and research on biometrics using human' s unique physiological characteristics is actively under way. These physiological characteristics include human fingerprints, retinas, veins, and facial irises, and due to the reliability derived from the uniqueness, they are expanding to access control systems, cash dispensers, and electronic commerce. In the case of iris recognition, the diversity of iris pattern is more interesting than any body part. The iris pattern is formed before the age of 3 years old, and iris generated once is almost unchanged for a lifetime.
In spite of its high accuracy and reliability, it has not been widely used due to user 's rejection and lack of hardware skills. However, due to the spread of iris recognition technology and the development of hardware performance due to the introduction of ePassport, The non-contact iris recognition system has been developed to solve the existing disadvantages.
However, in the case of a single iris recognition system, the feature values occupied in iris regions of the input image are different from each other, and there is a difference in the recognition performance due to the influence of noise such as eyebrow invasion or light reflections (glint) The problem should be complemented.
One aspect of the present invention provides a method for recognizing an iris.
Another aspect of the present invention provides an iris recognition apparatus.
According to an aspect of the present invention, there is provided a method for recognizing iris, comprising the steps of: changing a focal length within a predetermined range and subjecting a zoom magnification dependent on the focal length to image a plurality of images for iris recognition; The apparatus may include determining at least one image among the plurality of images as an optimal authentication image for the iris recognition, and the iris recognition apparatus performing an authentication procedure for the user based on the optimal authentication image have.
On the other hand, the zoom magnification is determined on the basis of the following equation according to the focal distance
Further, the predetermined range is determined by the distance detection sensor, and the zoom magnification is determined based on the following equation according to the focal distance
Where Z is the zoom magnification, F is the focal length, C n is the n-th order proportion constant, Zo is the Zoom initial offset, n is the order of the function, D sensor is the distance value sensed by the distance detection sensor , D scan1 may be an imaging distance that varies in the negative range, and D scan2 may be an imaging distance that varies in a positive range.
Also, the plurality of images may be captured based on infrared rays generated based on a plurality of infrared lights, and at least one of the plurality of infrared lights may operate according to the focal distance.
The iris recognition method may further include the step of providing the reflection image of the iris recognition device by an infrared ray filter of visible light generated based on visible light illumination for recognition of illumination reflection.
In addition, the iris recognition method may further include a step of detecting whether the iris recognition apparatus is approaching the user based on the object detection sensor, changing the focal distance by switching from the power save mode to the active mode.
According to another aspect of the present invention, there is provided an iris recognition apparatus comprising a processor, wherein the processor captures a plurality of images for iris recognition by varying a focal distance within a predetermined range and varying a zoom magnification depending on the focal distance, Determining at least one image among the plurality of images as an optimal authentication image for the iris recognition, and performing an authentication procedure for the user based on the optimal authentication image.
On the other hand, the zoom magnification is determined on the basis of the following equation according to the focal distance
Where Z is the zoom magnification, F is the focal length, C n is the n-th order proportion constant, Zo is the Zoom initial offset, and n is the order of the function.
Further, the predetermined range is determined by the distance detection sensor, and the zoom magnification is determined based on the following equation according to the focal distance
Where Z is the zoom magnification, F is the focal length, C n is the n-th order proportion constant, Zo is the Zoom initial offset, n is the order of the function, D sensor is the distance value sensed by the distance detection sensor , D scan1 may be an imaging distance that varies in the negative range, and D scan2 may be an imaging distance that varies in a positive range.
Also, the plurality of images may be captured based on infrared rays generated based on a plurality of infrared lights, and at least one of the plurality of infrared lights may operate according to the focal distance.
The processor may also be implemented to provide a reflected image by an infrared filter of visible light generated based on visible light illumination for recognition of illumination reflections.
In addition, the processor may be configured to detect whether the user is approaching based on the object detection sensor, change the focal distance by switching from a power save mode to an active mode.
The iris recognition method and apparatus according to the embodiment of the present invention can accurately and quickly recognize iris existing in various positions without expensive AF module and display.
1 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
2 is a block diagram illustrating an iris recognition apparatus according to an embodiment of the present invention.
3 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
4 is a block diagram illustrating an iris recognition apparatus according to an embodiment of the present invention.
5 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
6 is a conceptual diagram illustrating an operation of the iris recognition apparatus according to the embodiment of the present invention.
The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.
Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.
The conventional expensive iris authentication apparatus can operate based on a zoom function, an auto focus function, an automatic object recognition technology, and a liquid crystal display (LCD). The expensive iris authentication device can extract the iris image of high quality by performing the zoom function and the auto focus function according to the distance of the iris located at a distance or a near distance based on the above functions.
In addition, by displaying the iris image photographed through the LCD in real time to the user, it is possible to inform the user whether or not the iris occlusion phenomenon due to the reflection appears. The user can view and adjust the iris image so that the iris authentication failure can be prevented from occurring due to the illumination reflection.
The iris recognition module having such a function is generally used at a high price and may be difficult to be applied to various applications.
Hereinafter, an embodiment of the present invention will be described with reference to an iris recognition apparatus which can be implemented at a low cost. In order to implement the iris recognition apparatus at a low cost, it is necessary to recognize the iris of the user without expensive zoom function, automatic recognition of the subject and liquid crystal display (LCD).
Due to these constraints, the conventional low-cost iris recognition module should position the subject within a distance of 10 cm from the subject (or iris) distance and within +/- 7 mm of the subject distance. That is, the user must position the iris within 10 cm of the iris recognition module, and move the iris in the +/- 7 mm range to be precisely focused. Further, since there is no LCD for outputting the image of the iris, it is impossible to confirm whether or not the light is reflected.
In order to solve the problem of the low-cost iris recognition apparatus, the iris recognition apparatus according to the embodiment of the present invention enables the iris of the user located at a certain distance within a distance of 5 cm to 40 cm to be recognized. Such iris recognition can be achieved by the focus and digital zoom interlocking control without the automatic recognition function of the subject.
In addition to this, the user can recognize the reflection of the illumination at the time of the user's iris image capturing, perform the adjustment procedure, and perform normal iris authentication. Based on these functions, the iris recognition apparatus of the present invention can be implemented at low cost without expensive module / hardware and complicated processing procedures that can perform various functions, and the iris of the user can be accurately recognized under a wide recognition range. Specifically, the iris recognition apparatus according to the embodiment of the present invention can perform the iris recognition procedure without the auto focusing function implemented in the conventional iris recognition apparatus.
Hereinafter, the iris recognition device is expressed by the term iris recognition device, but the iris recognition device may be interpreted as an iris recognition camera module.
1 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
1, a method for recognizing a user's iris of an iris recognition apparatus is disclosed.
1, the user places an iris within a predetermined range (for example, 5 to 40 cm) based on the position of the iris recognition device (or the iris recognition camera module implemented in the iris recognition device) .
When the user places the iris at a specific position, the
The infrared
An image may be formed on the
The
A processor (not shown) can adjust the focal length of the
&Quot; (1) "
In the equation (1), Z may be a zoom magnification, F may be a focal length, Cn may be an n-th order proportional constant, Zo may be a Zoom initial offset, and n may be a degree of function (for example, n = 1). If the degree of the function is 1, Z and F can have a linear proportional relationship. The proportional constant is determined according to the configuration of the camera and the lens, and a proportional constant can be selected so that the image corresponding to the iris at each focal length has preferably about 250 pixels.
The focal length of the
The focal distance of the
That is, the iris recognition apparatus can continuously capture the fisheye distance of the
Specifically, the focal length of the
The iris of the user may be positioned in a range of 5 cm to 40 cm based on the iris recognition device (or the iris recognition camera module implemented in the iris recognition device), and the zoom magnification may be determined based on the above- .
Accordingly, when the subject is positioned at a specific position between 5 cm and 40 cm, the zoom magnification is adjusted according to the focal distance corresponding to the specific position, and the iris size can be adjusted to the designated size. As a specific example, when the iris is located at a distance of 30 cm, an image focused on the iris is captured when the focal distance of the lens passes 30 cm. At this time, the zoom magnification is controlled by automatically interlocking with the focal distance, The iris can have about 250 pixels. That is, at least one of a plurality of images successively imaged so that the focal distance changes to a constant unit (or an adaptive unit) may be an image focused on the iris and matching the iris authentication condition. An image that is focused on the iris and meets the iris authentication condition can be expressed in terms of the optimal authentication image. The iris recognition apparatus may determine an optimal authentication image among the plurality of images and may proceed with the authentication process of the user based on the optimal authentication image.
When the iris recognition method according to an embodiment of the present invention is used, authentication of a user's iris can be performed at various distances without recognizing and zooming iris objects performed through complicated and expensive processors and modules, Can be implemented at a low cost.
The above operation is performed only when the user is located within a certain range, so that the power of the iris recognition apparatus can be managed. For example, in addition to the iris recognition device, an object detection sensor may be implemented. When a user within a certain range is not detected by the object detection sensor, the iris recognition apparatus operates in a power saving mode to save power. On the other hand, if a user within a certain range is detected by the object detection sensor, the iris recognition apparatus can be switched to the active mode to perform the iris recognition operation.
2 is a block diagram illustrating an iris recognition apparatus according to an embodiment of the present invention.
2, the iris recognition apparatus includes an infrared illumination unit 200, a visible light illumination unit 210, an infrared
The infrared illumination unit 200 may be implemented to supply infrared light to a user's iris (or subject) during a user authentication procedure. The infrared ray generated by the infrared ray illumination unit 200 may be reflected by the iris and then transmitted through the infrared
The visible light illumination unit 210 may be implemented to supply visible light illumination to the iris in a user authentication procedure. The visible light illuminating unit 210 can illuminate the iris based on a visible light of 450 to 600 nm, for example, a band that the iris can perceive with the naked eye. The visible light reflected by the iris can be reflected by the infrared
The infrared
The imaging device 220 may have more pixels than the pixels of the imaging device 220 used in a typical iris camera module. In general, 300,000 pixels or less are used as the image pickup device of the iris camera module. However, the pixels used in the image pickup device 220 according to the embodiment of the present invention may be at least 1 million pixels, preferably 3 million pixels or more. A zoom without interpolation can be used through the use of such a high-resolution imaging device. As described above, the image pickup device 220 can operate at a zoom magnification determined depending on the focal distance set by the lens module 230. [
The lens module 230 includes, for example, a voice coil module (VCM), a lens module capable of adjusting the focus by moving the lens back and forth, and a liquid or silicon type lens, Or a lens module for controlling the focus using a motor and one or more movable lenses may be used. The lens module 230 can capture an image while changing the focal distance in a predetermined unit within a predetermined distance range.
The power supply unit 240 is connected to the respective components of the iris recognition apparatus (e.g., the infrared illumination unit 200, the visible light illumination unit 210, the imaging device 220, the lens module 230, the power supply unit 240, Or the like).
The processor 250 is connected to the infrared illumination unit 200, the visible light illumination unit 210, the imaging device 220, the lens module 230, the power supply unit 240, the processor 250, Or the like).
Although not shown in FIG. 2, the iris recognition apparatus may further include an optimum authentication image determination unit and an authentication unit.
The optimum authentication image determination section is implemented to determine an optimal authenticated image among a plurality of authenticated images captured based on a change in the lens module focal length and a change in the zoom magnification of the imaging device that varies depending on the variation of the lens module focal length . The iris recognition apparatus can capture a plurality of images by varying the focal length of the lens module in a predetermined unit (or an adaptive unit) and accordingly varying the zoom magnification. At least one of the captured images may be an image that allows the user's iris to be accurately recognized and the image may be an optimal authentication image. Specifically, the optimum authentication image may be an iris image corresponding to a certain range (for example, 250 pixels +/- 10%) of pixels corresponding to the imaged iris image.
The authentication unit may compare the iris characteristic determined based on the iris image included in the optimal authentication image with the registered iris characteristic stored in the database to proceed with the authentication process of the user.
Hereinafter, an iris recognition apparatus according to an embodiment of the present invention performs an iris recognition procedure by additionally performing distance detection based on a distance detection sensor.
3 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
3 illustrates a method of recognizing a user's iris in an iris recognition apparatus. In particular, a method for performing an iris recognition procedure based on a distance of an iris sensed primarily by a distance detection sensor for estimating the position of a subject (iris) is disclosed.
Referring to FIG. 3, the user may position the iris within a predetermined range (for example, 5 to 40 cm) based on the position of the iris recognition device (or the iris recognition camera module implemented in the iris recognition device) .
When the user places the iris, the
An image may be formed on the
The
The
The
For example, it can be assumed that the iris is located 25 cm from the iris recognition camera module. In this case, the
The processor (not shown) can control the
As described above, when the focal length of the
&Quot; (2) "
In the equation (2), Z may be a zoom magnification, F may be a focal length, Cn may be an n-th proportion constant, Zo may be a Zoom initial offset, and n may be a degree of function (for example, n = 1). If the degree of the function is 1, Z and F can have a linear proportional relationship. D sensor is a distance value sensed by the distance sensor, D scan1, D scan2 is a value for determining the set imaging range D scan1 an imaging distance that varies in a range of sound, D scan2 is a positive image capture distance one varying in the range of . The focal distance can be determined based on the D sensor and D scan1 and D scan2 .
The zoom magnification of the
&Quot; (3) "
Referring to Equation (3), Czoom may be a zoom array determination constant, and F lens may be a focal length. That is, the zoom magnification can be determined based on the focal length and zoom arrangement determination constant and the zoom offset value. The zoom magnification determination constant is determined according to the configuration of the camera and the lens, and the iris region may be selected to have a predetermined number of pixels (for example, 250 pixels +/- 10%) at each focus distance.
When the focal length of the
That is, the
The iris recognition apparatus determines an optimal authentication image among the images captured within the set imaging range, and proceeds with the authentication process of the user based on the optimal authentication image.
When the iris recognition method according to an embodiment of the present invention is used, authentication of a user's iris can be performed at various distances without recognizing and zooming iris objects performed through complicated and expensive processors and modules, Can be implemented at a low cost.
4 is a block diagram illustrating an iris recognition apparatus according to an embodiment of the present invention.
4, the iris recognition apparatus includes an infrared illumination unit 400, a visible light illumination unit 410, an infrared ray transmission filter 470, an imaging device 420, a lens module 430, a power source unit 440, 450 and a processor 460. As one embodiment, the infrared ray illumination unit 400, the visible light illumination unit 410, the infrared ray transmission filter 470, the imaging device 420, the lens module 430, the power source unit 440, the distance detection sensor 450, 460 may be included in the iris camera module of the iris recognition apparatus, but the present invention is not limited thereto. In one embodiment, the imaging device 420, the power supply unit 440, the distance detection sensor 450, and the processor 460 may be implemented as a single control circuit board, but the present invention is not limited thereto. Further, it is assumed that a plurality of components are controlled based on one processor, but an iris recognition apparatus may be operated based on an individual processor for a separate component rather than one processor. Further, it is assumed that a plurality of components are controlled based on one processor, but an iris recognition apparatus may be operated based on an individual processor for a separate component rather than one processor.
Each component can perform, for example, the following operations.
The infrared illumination unit 400 may be implemented to supply infrared light to a user's iris (or subject) during a user authentication procedure. The infrared rays generated by the infrared illumination unit 400 may be reflected by the iris and then transmitted through the infrared ray transmission filter 470 to generate image information of the iris based on the lens module 430 and the imaging device 420. The processor 460 may process the generated image information to perform an authentication procedure for the user. The infrared illumination unit 400 may be mounted at one or more positions from the lens module and may select an illumination position to be used in conjunction with the focal length of the lens module 430. [ Whereby the illumination angle according to the focal distance can be controlled.
The visible light illumination unit 410 may be implemented to supply visible light illumination to the iris in a user authentication procedure. The visible light illuminating unit 410 can illuminate the iris based on a band that can be detected by the iris, for example, visible light having a wavelength of 450 to 600 nm. The visible light reflected by the iris can be reflected by the infrared ray transmission filter 470 and can be directed to the iris. Thus, the infrared transmission filter 470 acts as a mirror and the user can visually confirm his / her iris image.
The infrared ray transmission filter 470 can be implemented to transmit light in the infrared wavelength band and reflect light in other wavelengths including the wavelength of the visible light band. Specifically, the infrared ray transmission filter 470 can transmit light in an infrared wavelength band, for example, 740 nm wavelength generated by the infrared ray illumination unit 400, and reflect the remaining light.
The imaging device 420 may have more pixels than the pixels of the imaging device 420 used in a typical iris camera module. Generally, 300,000 pixels or less are used as the image pickup device of the iris camera module. However, the pixels used in the image pickup device 420 according to the embodiment of the present invention may be at least 1 million pixels, preferably 3 million pixels or more. A zoom without interpolation can be used through the use of such a high-resolution imaging device. As described above, the image sensing device 420 can operate at a zoom magnification determined depending on the focal distance set by the lens module 430. [
The lens module 430 includes, for example, a voice coil module (VCM), a lens module capable of adjusting the focus by moving the lens back and forth, and a liquid or silicon type lens, Or a lens module for controlling the focus using a motor and one or more movable lenses may be used. The lens module can capture an image while changing the focal distance in a predetermined unit within a predetermined distance range. As described above, the processor 460 can receive information on the iris prediction position determined by the distance detection sensor 450 and information on the set imaging range, and can capture iris located within a certain distance range.
The power supply unit 440 is connected to each component of the iris recognition device (for example, the infrared illumination unit 400, the visible light illumination unit 410, the imaging device 420, the lens module 430, the power supply unit 440, 450 and processor 460, and the like).
The distance detection sensor 450 may be implemented to detect the distance between the iris and the iris recognition device (or the iris recognition camera module implemented in the iris recognition device). Information about the distance detected by the distance detection sensor 450 may be transmitted to the processor (or lens module 430) 460. The distance detection sensor 450 may directly measure the distance between the iris and the iris recognition device, but may measure the distance between the iris recognition device and a larger range of subjects such as the eye or the user.
The processor 460 is connected to each component of the iris recognition apparatus (for example, the infrared illumination unit 400, the visible light illumination unit 410, the imaging device 420, the lens module 430, the power supply unit 440, 450 and processor 460, and the like).
Similarly, although not shown in FIG. 4, the iris recognition apparatus may further include an optimum authentication image determination unit and an authentication unit.
The optimum authentication image determination section is implemented to determine an optimal authenticated image among a plurality of authenticated images captured based on a change in the lens module focal length and a change in the zoom magnification of the imaging device that varies depending on the variation of the lens module focal length . The iris recognition device can generate a plurality of images by picking up the focal position of the lens module by picking up an iris positioned within a predetermined imaging range around the iris prediction position determined by the distance detection sensor. At least one of the captured images may be an image that allows the user's iris to be accurately recognized and the image may be an optimal authentication image. Specifically, the optimum authentication image may be an iris image corresponding to a certain range (for example, 250 pixels +/- 10%) of pixels corresponding to the imaged iris image.
The authentication unit may compare the iris characteristic determined based on the iris image included in the optimal authentication image with the registered iris characteristic stored in the database to proceed with the authentication process of the user.
5 is a conceptual diagram illustrating an iris recognition method according to an embodiment of the present invention.
5, a method for authenticating a user by an iris recognition apparatus is disclosed.
Referring to FIG. 5, the iris recognition apparatus can divide the imaging focal length into a predetermined range and capture an image according to the priority.
The iris recognition device may have an imaging focal length for capturing an image within a range of 0 to 40 cm based on the position of the iris recognition device (or the iris recognition camera module implemented in the iris recognition device). The unit of cm, which will be described below, may refer to a distance based on the position of the iris recognition device (or the iris recognition camera module implemented in the iris recognition device).
In this case, the imaging focal length in the range of 40 cm is divided into a plurality of imaging units, priority for each of the plurality of imaging units can be set, and imaging for each of the plurality of imaging units can be sequentially performed. For example, in the imaging focal length range of 40 cm, the first preferred imaging unit 510 is 10 to 20 cm, the second preferred imaging unit 520 is 0 to 10 cm, the third preferred imaging unit 530 is 20 to 30 cm, The fourth preferred imaging unit 540 may be 30 cm to 40 cm.
In such a case, the iris recognition device may recognize the iris of the user by setting an imaging range of 10 to 20 cm corresponding to the first preferential imaging unit 510 to an imaging procedure. That is, the iris recognition apparatus preferentially performs imaging at a focal length corresponding to the first preferred imaging unit 510, and processes a plurality of images captured at a focal length corresponding to the first preferred imaging unit 510 It can be determined whether or not an authentication image exists.
If an optimal authentication image does not exist in the first preferred imaging unit 510, a range of 0 to 10 cm corresponding to the second preferred imaging unit 520 is set as a focal length, and then an imaging procedure is performed, Can be recognized. After the imaging of the first preferred imaging unit 510, the iris recognition device performs imaging at the focal length corresponding to the second preferred imaging unit 520, and at the focal distance corresponding to the second preferred imaging unit 520 The captured images may be processed to determine whether an optimal authenticated image is present.
Imaging and optimum authentication image determination procedures can be sequentially performed for the third preferential imaging unit 530 and the fourth preferential imaging unit 540 in the same manner. When the above method is used, a priority imaging procedure for the focal distance at which the users proceed the authentication procedure with a high frequency is performed, and if the optimum authentication image is obtained, the imaging procedure for the remaining imaging unit can be stopped. Accordingly, the iris recognition apparatus can perform the iris authentication procedure for the user more quickly.
The imaging unit to perform the imaging procedure with priority can be determined by various methods. For example, it may be set by an administrator who manages the iris recognition apparatus, or may be performed considering a database for an existing authentication procedure performed in the iris recognition apparatus. The iris recognition apparatus can store statistical information about the focal length in which the optimum authentication image has been obtained. The iris recognition apparatus statistically calculates the range of the focal distance obtained by acquiring the optimum authentication image for many people, divides the imaging focal distance of a certain distance (for example, 40 cm) into a plurality of imaging units, You can set the priority for.
6 is a conceptual diagram illustrating an operation of the iris recognition apparatus according to the embodiment of the present invention.
Figure 6 discloses a method for the lens module to capture a plurality of images for an optimal authentication image within an imaging focal length.
6, the lens module may generate a plurality of images for iris recognition while adjusting the imaging focal length to a certain unit (for example, 5 mm) within an imaging focal length (e.g., 40 cm) A plurality of images for iris recognition may be generated while adjusting the imaging focal length in an adaptive unit rather than a constant unit within the imaging focal length. The unit of imaging focal length adjusted for iris recognition can be expressed by the term focus adjustment unit.
For example, the iris recognition apparatus may further include a focus adjustment unit as the closer to a focal distance at which an optimum authentication image is likely to be obtained based on statistical information on an acquired focal length in an authentication procedure performed in the existing authentication process Can be set small. For example, if the acquisition probability of the optimal authentication image in the imaging focal distance in the range of 10 to 20 cm is higher than the acquisition probability of the optimum authentication image in the imaging focal distance in the range of 20 to 30 cm, The unit can be set to be relatively smaller than the primary adjustment unit of the imaging focal distance in the range of 20 to 30 cm.
For example, the first focus adjustment unit 610 of the imaging focal distance in the range of 10 to 20 cm is set to 3 mm, the second primary adjustment unit 620 of the imaging focal distance in the range of 20 to 30 cm is set to 6 mm, A plurality of images for recognition can be picked up.
Alternatively, if it is determined that the position of the actual iris is closer to the imaging focal distance in consideration of the imaging result, the primary adjustment unit may be reduced. For example, it can be assumed that the position of the iris is 15 cm, and the iris recognition apparatus shifts the imaging focal distance from 20 cm to 10 cm and the first-order adjustment unit is set to 5 mm.
The iris recognition apparatus can determine the predicted iris position by analyzing the captured image and set the focus adjustment unit in a region adjacent to the predicted iris position as a relatively small unit to proceed with the imaging procedure for the iris. The iris recognition device analyzed the image taken at 20 cm, and it can be predicted that the iris is located at 15.5 cm. Specifically, the iris recognition apparatus can determine the position of the predicted iris by judging the out-of-focus information of the iris from the result of imaging at 20 cm.
That is, when the predicted iris position is 15.5 cm, the iris recognition apparatus sets a relatively smaller focus adjustment unit (for example, 2 mm) for 16.5 to 14.5 cm, which is an area of +/- 1 cm based on 15.5 cm An imaging procedure can be performed.
Such an iris recognition method may be implemented in an application or may be implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.
The program instructions recorded on the computer-readable recording medium may be ones that are specially designed and configured for the present invention and are known and available to those skilled in the art of computer software.
Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.
Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.
Claims (14)
Imaging the plurality of images for iris recognition by changing the focal distance within a certain range and varying the zoom magnification depending on the focal distance;
The iris recognition apparatus determining at least one of the plurality of images as an optimal authentication image for iris recognition; And
Wherein the iris recognition device performs an authentication procedure for a user based on the optimal authentication image,
Wherein the focal length is preferentially changed in an image pickup unit having a relatively high priority among the plurality of image pickup units in consideration of the priority for each of the plurality of image pickup units set by dividing the predetermined range,
Wherein the priority of each of the plurality of photographing units is determined based on information on an acquisition distance of a plurality of optimal authentication images of a plurality of users.
The zoom magnification is determined based on the following equation according to the focal distance
≪ Equation &
Wherein Z is a zoom magnification, F is a focal length, C n is an n-th order proportion constant, Zo is a Zoom initial offset, and n is a degree of a function.
The predetermined range is determined by the distance detection sensor,
The zoom magnification is determined based on the following equation according to the focal distance
≪ Equation &
Where Z is the zoom magnification, F is the focal length, C n is the n-th order proportion constant, Zo is the Zoom initial offset, n is the order of the function, D sensor is the distance value sensed by the distance detection sensor , D scan1 is an imaging distance changing in a negative range, and D scan2 is an imaging distance changing in a positive range.
Wherein the plurality of images are captured based on infrared rays generated based on a plurality of infrared lights,
Wherein at least one of the plurality of infrared lights operates according to the focal distance.
Wherein the iris recognition apparatus further comprises a reflection image by an infrared filter of visible light generated based on visible light illumination for recognition of illumination reflection.
A focus adjustment unit that is a degree of change of the focal length for each of the plurality of photographing units is set,
Wherein the focus adjustment unit is set to a small value in a photographing unit in which the priority is relatively higher than a photographing unit in which the priority is relatively low among the plurality of photographing units.
Wherein the focus adjustment unit is determined by further considering information on a predicted iris position determined based on at least one of the plurality of images.
Wherein the iris recognition apparatus includes a processor,
The processor captures a plurality of images for iris recognition by changing the focal distance within a certain range and varying the zoom magnification depending on the focal distance,
Determining at least one of the plurality of images as an optimal authentication image for iris recognition,
And performing an authentication procedure for a user based on the optimal authentication image,
Wherein the focal length is preferentially changed in an image pickup unit having a relatively high priority among the plurality of image pickup units in consideration of the priority for each of the plurality of image pickup units set by dividing the predetermined range,
Wherein the priority of each of the plurality of photographing units is determined based on information on an acquisition distance of a plurality of optimal authentication images of a plurality of users.
The zoom magnification is determined based on the following equation according to the focal distance
≪ Equation &
Wherein Z is a zoom magnification, F is a focal length, C n is an n-th order proportional constant, Z o is a Zoom initial offset, and n is a degree of a function.
The predetermined range is determined by the distance detection sensor,
The zoom magnification is determined based on the following equation according to the focal distance
≪ Equation &
Where Z is the zoom magnification, F is the focal length, C n is the n-th order proportion constant, Z o is the Zoom initial offset, n is the order of the function, Dsensor is the distance value sensed by the distance detection sensor , Dscan1 is an imaging distance changing in a negative range, and Dscan2 is an imaging distance changing in a positive range.
Wherein the plurality of images are captured based on infrared rays generated based on a plurality of infrared lights,
Wherein at least one of the plurality of infrared lights operates according to the focal distance.
Wherein the processor is configured to provide a reflected image by an infrared filter of visible light generated based on visible light illumination for recognition of illumination reflections.
A focus adjustment unit that is a degree of change of the focal length for each of the plurality of photographing units is set,
Wherein the focus adjustment unit is set to a small value in a photographing unit in which the priority is relatively higher than a photographing unit in which the priority is relatively low among the plurality of photographing units.
Wherein the focus adjustment unit is determined by further considering information on a predicted iris position determined based on at least one of the plurality of images.
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| CN111950532A (en) * | 2020-09-15 | 2020-11-17 | 西安艾瑞生物识别科技有限公司 | Multimode zooming type iris recognition instrument based on deep learning |
| CN113536863A (en) * | 2020-04-22 | 2021-10-22 | 上海聚虹光电科技有限公司 | Spectral band selection method for self-adaptive iris gray scale |
| CN114430481A (en) * | 2019-11-21 | 2022-05-03 | 苏州思源科安信息技术有限公司 | Iris zooming focusing optical imaging system for long-distance large-visual-field iris optical imaging device |
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