JP2004005167A - Eye position specification method and device - Google Patents

Eye position specification method and device Download PDF

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Publication number
JP2004005167A
JP2004005167A JP2002159546A JP2002159546A JP2004005167A JP 2004005167 A JP2004005167 A JP 2004005167A JP 2002159546 A JP2002159546 A JP 2002159546A JP 2002159546 A JP2002159546 A JP 2002159546A JP 2004005167 A JP2004005167 A JP 2004005167A
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JP
Japan
Prior art keywords
eye position
eye
iris
image
pupil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002159546A
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Japanese (ja)
Inventor
Takeshi Ishihara
石原 健
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Publication date
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Priority to JP2002159546A priority Critical patent/JP2004005167A/en
Publication of JP2004005167A publication Critical patent/JP2004005167A/en
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Abstract

An eye position is specified with high accuracy in acquiring an eye image at the time of authentication.
In an eye position specifying method for specifying an eye position image to be authenticated with respect to an eye image acquired for authentication, a center and a diameter of each of a pupil and an iris are detected from the eye image (S11). , S12), the condition that the center of the pupil is included in the diameter of the iris (S13) and the center of the iris is included in the diameter of the pupil (S14) is set as the condition for specifying the eye position. With this configuration, an erroneous image other than the eye is not subjected to the authentication processing, and the eye position can be specified with high accuracy.
[Selection diagram] Fig. 4

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an eye position specifying method and apparatus for acquiring an eye image required in an authentication device using an iris, an authentication device using a retina, and the like (hereinafter, referred to as an iris authentication device).
[0002]
[Prior art]
Conventionally, this type of iris authentication device continuously captures images by adjusting the eye position according to the user's intention or the automatic focus function, and determines an image when a value equal to or greater than a predetermined focus determination value is detected as fixed data. As an authentication function.
[0003]
[Problems to be solved by the invention]
However, such a conventional iris authentication device often focuses not only on the eyes but also on the glasses, eyebrows, nose, etc., and the focus on the positions of the eyes is insufficient, so that an image different from the eyes is obtained. There was a problem that often. Furthermore, when specifying the position of the eye by image processing with respect to the entire captured eye image, there is a problem that it is difficult to accurately detect and specify the position of the eye due to the influence of eyelashes and the like. In addition, there is a problem that the time required for specifying the eye position is long due to the execution of the complicated calculation processing for specifying the eye position, and that the entire time including the authentication processing performed after specifying the eye position is long. Was.
[0004]
An eye position specifying method and apparatus according to the present invention has been made to solve the above-described problems related to eye position specification, and has an object to specify an eye position with high accuracy in acquiring an eye image at the time of authentication. It is. It is another object of the present invention to reduce the time for specifying the eye position and the time for the entire process.
[0005]
[Means for Solving the Problems]
An eye position specifying method according to the present invention is an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, wherein the center and the diameter of each of a pupil and an iris are obtained from the eye image. Is detected, and that the center of the pupil is included in the diameter of the iris and the center of the iris is included in the diameter of the pupil is set as a condition for specifying an eye position.
[0006]
With the above configuration, in addition to the presence or absence of the pupil and the iris, the positional relationship of the pupil existing in the iris region is determined, so that an erroneous image other than the eye is not subjected to the authentication processing, and the eye position can be accurately determined. Can be specified.
[0007]
The eye position identification method according to the present invention is the eye position identification method according to claim 1, wherein the center of the pupil is included in the diameter of the iris, and an arbitrary point on the circumference of the pupil is inside the diameter of the iris. Is included as a condition for specifying the eye position.
[0008]
According to the above configuration, in addition to the presence or absence of the pupil and the iris, in addition to the determination of the positional relationship of the pupil present in the iris region, by determining whether an arbitrary point on the pupil circumference exists in the iris circle, with even higher accuracy. The eye position can be specified.
[0009]
An eye position identification method according to the present invention is an eye position identification method for identifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, the method comprising the steps of: A condition for specifying an eye position is set based on a predetermined luminance difference from a luminance value of a point and a predetermined luminance difference between a luminance value of an arbitrary point in the iris region and a luminance value of an arbitrary point in the scleral region. .
[0010]
With the above configuration, the luminance difference between the luminance value of an arbitrary point in the pupil region and the luminance value in the iris region and the luminance difference between the luminance value of the arbitrary point in the iris region and the luminance value of the sclera (white-eye) region By determining the presence or absence of the pupil and the iris as the living eye based on the luminance difference, an erroneous image other than the eye is not recognized as a target of the authentication processing, and the eye position can be specified with high accuracy.
[0011]
An eye position identification method according to the present invention is an eye position identification method for identifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, the method comprising the steps of: A condition for specifying an eye position on the condition of a predetermined luminance change rate with respect to a point luminance value and a predetermined luminance change rate between a luminance value of an arbitrary point in the iris region and a luminance value of an arbitrary point in the scleral region. To
[0012]
With the above configuration, the luminance change rate between the luminance value of an arbitrary point in the pupil region and the luminance value in the iris region and the luminance change rate of the arbitrary point in the iris region and the luminance value of the sclera (white eye) region Since the presence or absence of a pupil and an iris as a living eye is determined based on the luminance change rate of, an erroneous image other than the eye is not subjected to the authentication processing, and the eye position can be specified with high accuracy.
[0013]
An eye position identification method according to the present invention is an eye position identification method for identifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, wherein the center of the pupil is included from the right radius to the left radius of the iris. The center of the iris is included from the right radius of the pupil to the left radius, the right radius of the pupil is smaller than the right radius of the iris, the left radius of the pupil is smaller than the left radius of the iris, and the upper radius of the pupil is the upper radius of the iris. At least one that is smaller and the lower radius of the pupil is smaller than the lower radius of the iris is a condition for specifying the eye position.
[0014]
With the above configuration, in addition to the presence or absence of the pupil and the iris, it is determined whether or not the positional relationship of the pupil existing in the iris region is appropriate. The eye position can be specified with high accuracy.
[0015]
An eye position specifying method according to the present invention is the eye position specifying method according to any one of claims 1 to 6, wherein the eye position image to be authenticated is specified with respect to the eye image acquired for authentication. In the position specifying method, the eye image is decomposed into a plurality of strips, and the true image center is extracted based on the image center coordinates extracted for each strip to specify the eye position.
[0016]
According to the above configuration, the eye position can be specified with high accuracy in the subsequent eye position specifying process in order to accurately extract the center of the image.
[0017]
According to the eye position specifying method of the present invention, in the eye position specifying method of the present invention, detecting the scleral region is a condition for specifying the eye position as a living eye.
[0018]
With the above configuration, in addition to determining the presence or absence of the pupil and the iris and the positional relationship between the pupils existing in the iris region, the function of determining the presence or absence of the sclera (white eye) region is provided. can do.
[0019]
An eye position specifying method according to the present invention is an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image obtained for authentication, wherein the eye position image is obtained in a range of the obtained eye image. Are specified by a plurality of processes performed by changing
[0020]
According to the above configuration, since the eye position is specified a plurality of times while changing the range, the eye position can be specified with higher accuracy.
[0021]
An eye position specifying method according to the present invention is the eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, wherein the first boundary of the missing area of the image of the eye position is provided. Detecting a line, virtually generating a second boundary line of an area where the first boundary line overlaps the iris region or the pupil region, and defining an effective region defined by the second boundary line and the boundary line of the iris region. Is determined to be an area that can be authenticated.
[0022]
According to the above configuration, when part of an eye image is missing due to reflected light, noise, or the like, and authentication processing is difficult, before identifying an eye image to be subjected to authentication processing, it is determined in advance whether authentication is possible and necessary. Then, by prompting the eye image acquisition process again, the authentication is not performed based on the unauthenticated eye image, and the authentication time can be reduced.
[0023]
An eye position specifying method according to the present invention is an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, the focus determination being limited to an area centered on a pupil and an iris. After that, the eye image is obtained.
[0024]
With the above configuration, by limiting the focus determination target to an area centered on the pupil and the iris, it is not necessary to obtain an image of an area other than the eyes unnecessary for the authentication process, and the center of the pupil and the iris is also reduced. Since the focus determination can be performed, the eye position can be specified with high accuracy.
[0025]
An eye position specifying method according to the present invention is an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication, wherein the eye image has a luminance value of an adjacent pixel. The presence or absence of a pupil and an iris are detected based on the boundary detected using the change rate.
[0026]
According to the above configuration, by detecting the boundary between the pupil and the iris or the boundary between the iris and the sclera (white eye) using the change rate of the luminance value of the adjacent pixels, the presence or absence of the pupil and the iris without performing coordinate calculation. Can be determined, so that the time for specifying the eye position can be reduced.
[0027]
An eye position specifying method according to the present invention is an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication. The specific template prepared in this manner is arranged around the eye position, and the area outside the template area is masked.
[0028]
With the above configuration, by masking the outside of the template region from an image acquired using a template adapted to the shape of the eye, eyelashes and the like that cause noise components located around the eye are removed, and the pupil and the iris are removed. The accuracy of position detection can be improved, and the eye position can be specified with high accuracy.
[0029]
An authentication device of the present invention authenticates an image of an eye position specified by using the eye position specifying method according to any one of claims 1 to 14. With this configuration, the authentication process is performed on the eye position specified with high accuracy, thereby improving the authentication accuracy. Further, since the time for specifying the eye position is reduced, the time for the entire processing including the authentication processing can be reduced.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an image of an eye image in the eye position specifying method according to the first embodiment of the present invention, and FIG. 2 is a diagram showing coordinates of the eye image. As shown in FIGS. 1 and 2, eye image acquisition is based on pupil center coordinates (x_p0, y_p0) 1, iris center coordinates (x_i0, y_i0) 2, and an arbitrary point on the pupil circumference. This is performed based on the coordinates (x_p, y_p) 3 and the coordinates (x_i, y_i) 4 of an arbitrary point on the iris circumference. FIG. 3 is a diagram illustrating a configuration of an iris authentication device for performing the eye position specifying method according to the first embodiment, and FIG. 4 is a diagram illustrating a processing flow of the eye position specifying method.
[0031]
As shown in FIG. 3, the image data captured by the lens 11 and the image sensor 12 is subjected to an eye image determination process to be subjected to an authentication process in an image processing unit 13, and thereafter, an iris analysis or Authentication processing based on pupil analysis is performed. The image processing unit 13 includes a focus determination unit 14, an image acquisition unit 15, an eye position identification unit 16 having a function of detecting a center position and a diameter of each of a pupil and an iris, and an authentication process for determining an image to be subjected to an authentication process. An image determination unit 17 is provided. The eye position specifying unit 16 has a function described in the following embodiments in addition to the above function. In the first embodiment, the eye position specifying unit 16 has a function of comparing the respective center positions and diameters of the pupil and the iris.
[0032]
As shown in FIG. 4, the processing of the eye position specifying unit 16 includes detection of pupil center coordinates (x_p, y_p) and diameter (rp) (S11) and detection of iris center coordinates (x_i, y_i) and diameter (ri). (S12) is performed, and then it is determined whether the pupil center is included in the iris diameter (x_i0-ri <x_p0 <x_i0 + ri, y_i0-ri <y_p0 <y_i0 + ri) (S13), and the iris center is included in the pupil diameter. (X_p0−rp <x_i0 <x_p0 + rp, y_p0−rp <y_i0 <y_p0 + rp) (S14). The condition for specifying the eye position is that the center of the pupil is included in the diameter of the iris and that the center of the iris is included in the diameter of the pupil.
[0033]
As shown in FIG. 1, the pupil needs to be located in the iris region in order to recognize the image as a human eye image, but according to the first embodiment, the eye position specifying unit 16 Has a function of determining the positional relationship between the pupil present in the iris region in addition to the presence / absence of the pupil and the iris, so that an erroneous image other than the eye is not subjected to the authentication processing.
[0034]
FIG. 5 is a diagram showing a processing flow of an eye position specifying method according to the second embodiment of the present invention. In the second embodiment, in addition to the processing of the first embodiment, it is determined whether an arbitrary point on the pupil circumference exists in the iris circle (S15). In this determination, the distance a between the center of the pupil and an arbitrary point on the pupil circumference is compared with the distance b between the center of the iris and an arbitrary point on the circumference of the iris, and under the condition that a <b. Do. Here, a = √ ((x_p−x_p0) 2 + (Y_py-y_p0) 2 ), B = √ ((x_ix−i_0)) 2 + (Y_i-y_i0) 2 ).
[0035]
As shown in FIG. 1, the pupil needs to be located in the iris region in order to recognize the image as a human eye image. In addition to determining the presence or absence of the pupil and the iris and the positional relationship of the pupil existing in the iris area, the function of determining whether an arbitrary point on the pupil circumference is present in the iris circle is provided. Images can be recognized.
[0036]
FIG. 6 is a diagram showing a processing flow of an eye position specifying method according to the third embodiment of the present invention. In the third embodiment, pupil center coordinates (x_p, y_p) and diameter (rp) are detected to extract a pupil region (S16), and iris center coordinates (x_i, y_i) and diameter (ri) are detected. A region is extracted (S17). Thereafter, the luminance value of an arbitrary point in the pupil region is compared with the luminance value in the iris region to determine whether the luminance difference is within a predetermined range (S18). The luminance value of the film (white-eye) region is compared to determine whether the luminance difference is within a predetermined range (S19).
[0037]
As shown in FIG. 1, in order to recognize a human eye image, there is a luminance difference between the sclera (white eye) region and the iris and a luminance difference between the iris and the pupil. However, according to the third embodiment, in the eye position specifying unit 16, the luminance difference between the luminance value of an arbitrary point in the pupil region and the luminance value in the iris region and the luminance difference of the arbitrary point in the iris region are determined. Since there is a function to determine the presence or absence of a pupil and an iris as a living eye based on a luminance difference between a luminance value and a luminance value of a sclera (white eye) region, an erroneous image other than the eye is subjected to authentication processing. Is gone.
[0038]
FIG. 7 is a diagram showing a processing flow of an eye position specifying method according to the fourth embodiment of the present invention. In the fourth embodiment, pupil center coordinates (x_p, y_p) and diameter (rp) are detected to extract a pupil region (S16), and iris center coordinates (x_i0, y_i0) and diameter (ri) are detected. A region is extracted (S17). Thereafter, the luminance value of an arbitrary point in the pupil region is compared with the luminance value in the iris region to determine whether the luminance change rate is within a predetermined range (S18). The luminance value of the sclera (white eye) region is compared with the luminance value to determine whether the luminance change rate is within a predetermined range (S19).
[0039]
As shown in FIG. 1, in order to recognize the image as a human eye image, there are a luminance difference between the sclera (white-eye) region and the iris and a luminance difference between the iris and the pupil. Although the luminance difference needs to have a predetermined rate of change, according to the fourth embodiment, the eye position specifying unit 16 determines the difference between the luminance value of an arbitrary point in the pupil region and the luminance value in the iris region. The eye has a function of determining the presence or absence of a pupil and an iris as a living eye based on a luminance change rate and a luminance change rate between a luminance value of an arbitrary point in the iris region and a luminance value of a sclera (white eye) region. Erroneous images other than the above are not targeted for authentication processing.
[0040]
FIG. 8 is a diagram showing the coordinates of an eye image in the eye position specifying method according to the fifth embodiment of the present invention. As shown in FIG. 8, eye image acquisition is performed in addition to pupil center coordinates (x_p0, y_p0) 1 and iris center coordinates (x_i0, y_i0) 2 specified for the human eye, and a pupil horizontal right radius (rp_r) 19. Pupil horizontal left radius (rp_l) 20, iris horizontal right radius (ri_r) 21, iris horizontal left radius (ri_l) 22, pupil vertical upper radius (rp_u) 23, pupil vertical lower radius (rp_d) 24, iris vertical upper radius (Ri_u) 25 and the iris vertical lower radius (ri_d) 26. FIG. 9 is a diagram illustrating a flow of processing of an eye position specifying method according to the fifth embodiment. Here, pupil radius rp = rp_r + rp_l (rp_u + rp_d), and iris radius ri = ri_r + ri_l (ri_u + ri_d).
[0041]
As shown in FIG. 9, in the fifth embodiment, pupil center coordinates (x_p, y_p), pupil horizontal right radius (rp_r), pupil horizontal left radius (rp_l), pupil vertical upper radius (rp_u), pupil vertical lower radius Detection of radius (rp_d) (S22) and iris center coordinates (x_i, y_i) and iris horizontal right radius (ri_r), iris horizontal left radius (ri_l), iris vertical upper radius (ri_u), iris vertical lower radius (ri_d) Is detected (S23), and then it is determined whether the pupil center is included in the iris horizontal right radius to the left radius (x_i0-ri <x_p0 <x_i0 + ri, y_i0-ri <y_p0 <y_i0 + ri) (S24), and the iris center Is determined to be included in the pupil horizontal right radius to the left radius (x_p0−rp <x_i0 <x_p0 + rp, y_p0−rp <y_i0 <y_ 0 + rp) (S25), the pupil horizontal right radius is smaller than the iris horizontal right radius (rp_r <ri_r), the pupil horizontal left radius is smaller than the iris horizontal left radius (rp_l <ri_l), and the pupil vertical upper radius is the iris vertical upper radius. It is determined whether it is smaller (rp_u <ri_u) and the pupil vertical lower radius is smaller than the iris vertical lower radius (rp_d <ri_d) (S26). The pupil center is included in the iris horizontal right radius to the left radius, the iris center is included in the pupil horizontal right radius to the left radius, and the pupil horizontal right radius is smaller than the iris horizontal right radius, and the pupil horizontal left radius is the iris horizontal left radius. Smaller, the pupil vertical upper radius is smaller than the iris vertical upper radius, and the pupil is determined to be present in the iris region on the condition that the pupil vertical lower radius is smaller than the iris vertical lower radius. set to target.
[0042]
As shown in FIG. 1, the pupil needs to be located in the iris region in order to recognize the image as a human eye image. However, according to the fifth embodiment, the eye position specifying unit 16 In addition, since a function of determining whether the pupil present in the iris region is appropriate in addition to the presence or absence of the pupil and the iris is provided, an erroneous image other than the eye is not subjected to the authentication processing.
[0043]
FIG. 10 is a diagram showing an image of an eye image in the eye position specifying method according to the sixth embodiment of the present invention. As shown in FIG. 10, eye image acquisition is performed by pupil center coordinates (x_p0, y_p0), iris center coordinates (x_i0, y_i0), arbitrary point coordinates on the pupil circumference, and iris circumference specified for the human eye. In addition to the above arbitrary point coordinates, the detection is performed based on the detection range 27 divided into a plurality of strips in order to remove noise components. FIG. 11 is a diagram illustrating a flow of processing of the eye position specifying method according to the sixth embodiment.
[0044]
As shown in FIG. 11, in the sixth embodiment, detection of pupil center coordinates ((x_p, y_p)) and diameter (rp) (S11) and detection of iris center coordinates (x_i, y_i) and diameter (ri) are performed. Before performing (S12), the image is decomposed into strips (S27). Thereafter, the true image center is extracted based on the image center coordinates extracted for each strip (S28), and the eye position is specified (S29). For example, the image center determined by majority from a plurality of image centers extracted for each strip is set as a true image center.
[0045]
According to the sixth embodiment, since the eye position specifying unit 16 has a function of extracting an accurate image center, highly accurate detection can be performed in the subsequent eye position specifying processing.
[0046]
FIG. 12 is a diagram showing a processing flow of an eye position specifying method according to the seventh embodiment of the present invention. In the seventh embodiment, in addition to the first embodiment, the presence or absence of a sclera (white-eye) region is determined (S30).
[0047]
According to the seventh embodiment, in addition to the determination of the presence or absence of the pupil and the iris and the positional relationship between the pupils existing in the iris region, the function of determining the presence or absence of the sclera (white-eye) region in the eye position specifying unit 16. , The eye image can be recognized with higher accuracy.
[0048]
FIG. 13 is a diagram showing a processing flow of an eye position specifying method according to the eighth embodiment of the present invention. In the eighth embodiment, the eye position specifying unit 16 performs the eye position specifying processing a plurality of times by changing the range of the obtained eye image based on the detection result of the center and the position of the pupil or the iris (S31, S32, S33). In this case, when an image such as an eyebrow or a mole that is clearly different from the eye image is included, the authentication processing image is determined without using these images.
[0049]
According to the eighth embodiment, since the eye position specifying unit 16 has a function of specifying the eye position a plurality of times by changing the range, the eye image can be recognized with higher accuracy.
[0050]
FIG. 14 is a diagram showing an image of an eye image in the eye position specifying method according to the ninth embodiment of the present invention, FIG. 15 is a diagram showing coordinates of the eye image, and FIG. 16 is a diagram showing a flow of processing of the eye position specifying method. It is. As shown in FIGS. 14 and 15, in the ninth embodiment, the eye position is specified when a part of the eye image is missing due to reflected light or noise at the iris or pupil. In FIG. 14, the missing region of the eye image exists in a part of the pupil region and the iris region in the eye image, and in the coordinates of FIG. 15, the boundary line Ia of the missing region, the missing region and the iris region or the pupil region. This is indicated by a boundary line Ib of the overlapping region and a boundary line Ic of the iris region.
[0051]
As shown in FIG. 16, a boundary line Ia of a region missing due to reflected light or the like is detected from the eye image in which the eye position is specified (S34), and a boundary line Ia of the region where the boundary line Ia overlaps with the iris region or the pupil region is detected. The line Ib is virtually generated (S35). It is determined whether the effective region defined by the boundary line Ib and the boundary line Ic of the iris region is an area that can be authenticated (S36). If it is determined that the area can be authenticated, the eye image at this time is subjected to the authentication processing. The area that can be authenticated changes according to the required authentication accuracy. In the case of low authentication accuracy, the iris region does not need to be completely specified, and thus the area that can be authenticated is small. On the other hand, in the case of high authentication accuracy, it is necessary to specify the iris region almost completely, so that the area that can be authenticated is large. Further, the area that can be authenticated may be set in a range where erroneous recognition is allowable.
[0052]
According to the ninth embodiment, when part of an eye image is missing due to reflected light, noise, or the like, and authentication processing is difficult, the eye position specifying unit 16 specifies an eye image to be subjected to authentication processing. It is determined in advance whether authentication is possible, and if necessary, a function to prompt the eye image acquisition process again is provided, so that unnecessary authentication is not performed.
[0053]
FIG. 17 is a diagram showing an image of an eye image in the eye position specifying method according to the tenth embodiment of the present invention. In the tenth embodiment, the focus determination unit 14 performs focus calculation limited to an area centered on the pupil and the iris (focus determination area 29), and performs focus determination.
[0054]
According to the tenth embodiment, the focus determination unit 14 limits the focus determination target to an area centered on the pupil and the iris, and does not acquire an image of an area other than the eyes unnecessary for the authentication processing. In addition, it is possible to perform focus determination centering on the pupil and the iris.
[0055]
FIG. 18 is a diagram illustrating the coordinates of an eye image in the eye position specifying method according to the eleventh embodiment, and FIG. 19 is a diagram illustrating the flow of processing in the eye position specifying method. In the eleventh embodiment, a boundary between a pupil and an iris or a boundary between an iris and a sclera (white eye) is detected from an image acquired using a change rate of a luminance value of an adjacent pixel.
[0056]
As shown in FIG. 19, the processing of the eye position specifying unit 16 first detects a boundary line from the acquired image using the change rate of the luminance value of the adjacent pixel (S37), and detects the detected boundary line. If is an arc, it is determined that it is a boundary between the pupil and the iris (S38). Next, a boundary line is detected from the acquired image using the change rate of the luminance value of the adjacent pixel (S39). If the detected boundary line is arc-shaped, the boundary between the iris and the sclera (white eye) is detected. A line is determined (S40). The change rate of the brightness value is set in advance to detect the respective boundaries of the pupil and the iris, and the iris and the sclera (white eye).
[0057]
According to the eleventh embodiment, the eye position specifying unit 16 has a function of detecting the boundary between the pupil and the iris or the boundary between the iris and the sclera (white eye) using the change rate of the luminance value of the adjacent pixel. With the provision, the presence or absence of the pupil and the iris can be determined without performing coordinate calculation.
[0058]
FIG. 20 is a diagram showing an image of an eye image in the eye position specifying method according to the twelfth embodiment. In the twelfth embodiment, a specific template 32 prepared in advance according to the shape of the eye is arranged around the eye position with respect to the acquired image, and the outside of the template area is masked.
[0059]
According to the twelfth embodiment, the eye position specifying unit 16 has a function of masking the outside of the template region from an image acquired using a template adapted to the shape of the eye, so that the noise component located around the eye is provided. The eyelashes and the like that cause the eyelash are removed, the accuracy of the position detection of the pupil and the iris is improved, and the eye image can be recognized with high accuracy.
[0060]
FIG. 21 shows the configuration of an iris authentication device for performing the eye position specifying method according to the thirteenth embodiment of the present invention. In the thirteenth embodiment, the eye position information specified by the eye position specifying unit 16 is fed back to the focus determination unit 14.
[0061]
By applying the iris authentication device described in the thirteenth embodiment, the focus determination accuracy of the focus determination unit 14 is improved, and thus the pupil and iris position detection accuracy is improved. Therefore, determination of the presence or absence of a pupil and an iris, determination of a positional relationship, and detection of a living eye can be performed with high accuracy, and an erroneous image other than the eye is not recognized as a target of the authentication processing.
[0062]
【The invention's effect】
As described above, according to the present invention, in addition to the presence / absence of the pupil and the iris, the positional relationship between the pupils present in the iris region is determined, so that an erroneous image other than the eye is not subjected to the authentication processing. The eye position can be specified with high accuracy.
[Brief description of the drawings]
FIG. 1 is an image of an eye image in an eye position specifying method according to a first embodiment of the present invention.
FIG. 2 shows coordinates of an eye image in an eye position specifying method according to the first embodiment of the present invention.
FIG. 3 is an authentication device for performing the eye position specifying method according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing an eye position specifying method according to the first embodiment of the present invention.
FIG. 5 is a flowchart illustrating an eye position specifying method according to a second embodiment of the present invention.
FIG. 6 is a flowchart illustrating an eye position specifying method according to a third embodiment of the present invention.
FIG. 7 is a flowchart illustrating an eye position specifying method according to a fourth embodiment of the present invention.
FIG. 8 is an image of an eye image in an eye position specifying method according to a fifth embodiment of the present invention.
FIG. 9 is a flowchart illustrating an eye position specifying method according to a fifth embodiment of the present invention.
FIG. 10 is an image of an eye image in an eye position specifying method according to a sixth embodiment of the present invention.
FIG. 11 is a flowchart illustrating an eye position specifying method according to a sixth embodiment of the present invention.
FIG. 12 is a flowchart illustrating an eye position specifying method according to a seventh embodiment of the present invention.
FIG. 13 is a flowchart illustrating an eye position specifying method according to an eighth embodiment of the present invention.
FIG. 14 is an image of an eye image in an eye position specifying method according to a ninth embodiment of the present invention.
FIG. 15 shows coordinates of an eye image in an eye position specifying method according to a ninth embodiment of the present invention.
FIG. 16 is a flowchart showing an eye position specifying method according to a ninth embodiment of the present invention.
FIG. 17 is an image of an eye image in an eye position specifying method according to a tenth embodiment of the present invention.
FIG. 18 is an image of an eye image in an eye position specifying method according to an eleventh embodiment of the present invention.
FIG. 19 is a flowchart illustrating an eye position specifying method according to an eleventh embodiment of the present invention.
FIG. 20 is an image of an eye image in an eye position specifying method according to a twelfth embodiment of the present invention.
FIG. 21 shows an authentication device according to a thirteenth embodiment of the present invention.
[Explanation of symbols]
1 pupil center coordinates
2 Iris center coordinates
3. Arbitrary point coordinates on the pupil circumference
4 Arbitrary point coordinates on the iris circumference
5 Sclera (white eye)
8 Eyelashes
9 Upper eyelid
10 Lower eyelid
11 lenses
12 Image sensor
13 Image processing unit
14 Focus judgment unit
15 Image acquisition unit
16 Eye position identification unit
17 Authentication processing image determination unit
18 Authentication processing section
19 pupil horizontal right radius
20 pupil horizontal left radius
21 iris horizontal right radius
22 iris horizontal left radius
23 pupil vertical upper radius
24 pupil vertical lower radius
25 Vertical iris radius
26 Vertical iris lower radius
27 Detection range
28 Missing area of eye image due to reflected light
29 Focus judgment area
31 pixels
32 templates

Claims (29)

  1. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    The center and diameter of each of the pupil and the iris are detected from the eye image, and the eye position is specified such that the center of the pupil is included in the diameter of the iris and the center of the iris is included in the diameter of the pupil. Eye position identification method characterized by the following conditions:
  2. The condition for specifying the eye position is that the center of the pupil is included in the diameter of the iris, and that an arbitrary point on the circumference of the pupil is included inside the diameter of the iris. The eye position specifying method according to claim 1.
  3. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    A predetermined luminance difference between a luminance value of an arbitrary point in the pupil region and a luminance value of an arbitrary point in the iris region and a predetermined luminance difference between the luminance value of an arbitrary point in the iris region and the luminance value of an arbitrary point in the scleral region. An eye position specifying method, wherein the condition is a condition for specifying an eye position.
  4. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    A predetermined luminance change rate between a luminance value at an arbitrary point in the pupil region and a luminance value at an arbitrary point in the iris region, and a predetermined luminance change between a luminance value at an arbitrary point in the iris region and a luminance value at an arbitrary point in the scleral region. An eye position specifying method, wherein a condition for specifying an eye position is set based on a rate.
  5. The eye position specifying method according to claim 3, wherein the eye position is an eye position as a living eye.
  6. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    The center of the pupil is included from the right radius to the left radius of the iris, the center of the iris is included from the right radius of the pupil to the left radius, the right radius of the pupil is smaller than the right radius of the iris, and the left radius of the pupil is the left radius of the iris. An eye position characterized by at least one of a condition that the eye radius is smaller than the radius, the upper radius of the pupil is smaller than the upper radius of the iris, and the lower radius of the pupil is smaller than the lower radius of the iris. Identification method.
  7. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    7. The eye image according to claim 1, wherein the eye image is decomposed into a plurality of strips, a true image center is extracted based on the image center coordinates extracted for each strip, and an eye position is specified. Eye position specification method described in section.
  8. 2. The eye position specifying method according to claim 1, wherein detecting the scleral region is a condition for specifying an eye position as a living eye.
  9. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying method, wherein the eye position image is specified by a plurality of processes performed while changing the range of the obtained eye image.
  10. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    Detecting a first boundary line of a missing region of the image at the eye position, virtually generating a second boundary line of a region where the first boundary line overlaps with an iris region or a pupil region; And determining whether an effective area defined by the iris area and the boundary line of the iris area is an area that can be authenticated.
  11. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying method, wherein the eye image is obtained after performing focus determination limited to an area centered on a pupil and an iris.
  12. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying method, wherein the presence or absence of a pupil and an iris is detected based on a boundary detected using a change rate of a luminance value of an adjacent pixel in the eye image.
  13. 13. The eye position specifying method according to claim 12, wherein the presence or absence of the pupil and the iris is detected when the boundary is arc-shaped.
  14. In an eye position specifying method for specifying an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying method comprising: arranging a specific template prepared in advance in accordance with the shape of the eye with respect to the eye image, centering on the eye position, and masking the outside of the template area.
  15. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    The center and diameter of each of the pupil and the iris are detected from the eye image, and the eye position is determined on the condition that the center of the pupil is included in the diameter of the iris and the center of the iris is included in the diameter of the pupil. An eye position specifying device, comprising: an eye position specifying unit that specifies the eye position.
  16. The eye position specifying means is provided under the condition that the center of the pupil is included in the diameter of the iris and an arbitrary point on the circumference of the pupil is included inside the diameter of the iris. 16. The eye position specifying device according to claim 15.
  17. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    A predetermined luminance difference between a luminance value of an arbitrary point in the pupil region and a luminance value of an arbitrary point in the iris region and a predetermined luminance difference between the luminance value of an arbitrary point in the iris region and the luminance value of an arbitrary point in the scleral region. An eye position specifying device, comprising: an eye position specifying unit that specifies an eye position as a condition.
  18. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    A predetermined luminance change rate between a luminance value at an arbitrary point in the pupil region and a luminance value at an arbitrary point in the iris region, and a predetermined luminance change between a luminance value at an arbitrary point in the iris region and a luminance value at an arbitrary point in the scleral region. An eye position specifying device, comprising: an eye position specifying means for specifying an eye position on condition of a rate.
  19. 19. The eye position specifying device according to claim 17, wherein the eye position is an eye position as a living eye.
  20. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    The center of the pupil is included from the right radius to the left radius of the iris, the center of the iris is included from the right radius of the pupil to the left radius, the right radius of the pupil is smaller than the right radius of the iris, and the left radius of the pupil is the left radius of the iris. Eye position specifying means for specifying an eye position for specifying an eye position on the condition that at least one of the following is smaller than the radius, the upper radius of the pupil is smaller than the upper radius of the iris, and the lower radius of the pupil is smaller than the lower radius of the iris. An eye position specifying device, comprising:
  21. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    The eye position specifying means decomposes the eye image into a plurality of strips, extracts a true image center based on image center coordinates extracted for each strip, and specifies an eye position. 21. The eye position specifying device according to any one of 15 to 20.
  22. 14. The eye position specifying device according to claim 13, wherein the eye position specifying means specifies an eye position as a living eye on condition that a scleral region is detected.
  23. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying device, comprising: means for specifying the image of the eye position by performing a plurality of processes while changing the range of the obtained eye image.
  24. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    Detecting a first boundary line of a missing region of the image at the eye position, virtually generating a second boundary line of a region where the first boundary line overlaps with an iris region or a pupil region; An eye image identification apparatus, comprising: means for determining whether an effective area defined by a boundary of an iris area and an iris area is an authenticable area.
  25. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying apparatus comprising: a focus determination unit configured to perform a focus determination limited to an area centered on a pupil and an iris to acquire an eye image.
  26. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying device, comprising: an eye position specifying unit that detects the presence or absence of a pupil and an iris based on a boundary detected using a change rate of a luminance value of an adjacent pixel with respect to the eye image.
  27. 27. The eye position specifying device according to claim 26, wherein the presence or absence of the pupil and the iris is detected when the boundary is arc-shaped.
  28. In an eye position specifying device that specifies an image of an eye position to be authenticated with respect to an eye image acquired for authentication,
    An eye position specifying device for arranging a specific template prepared in advance in accordance with the shape of the eye with respect to the eye image at the center of the eye position and masking the outside of the template area; .
  29. An authentication device that authenticates an image of an eye position specified by using the eye position specifying method according to claim 1.
JP2002159546A 2002-05-31 2002-05-31 Eye position specification method and device Pending JP2004005167A (en)

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US7761453B2 (en) 2005-01-26 2010-07-20 Honeywell International Inc. Method and system for indexing and searching an iris image database
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US8045764B2 (en) 2005-01-26 2011-10-25 Honeywell International Inc. Expedient encoding system
US8050463B2 (en) 2005-01-26 2011-11-01 Honeywell International Inc. Iris recognition system having image quality metrics
US8049812B2 (en) 2006-03-03 2011-11-01 Honeywell International Inc. Camera with auto focus capability
US8064647B2 (en) 2006-03-03 2011-11-22 Honeywell International Inc. System for iris detection tracking and recognition at a distance
US8063889B2 (en) 2007-04-25 2011-11-22 Honeywell International Inc. Biometric data collection system
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US8442276B2 (en) 2006-03-03 2013-05-14 Honeywell International Inc. Invariant radial iris segmentation
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US8630464B2 (en) 2009-06-15 2014-01-14 Honeywell International Inc. Adaptive iris matching using database indexing
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US8098901B2 (en) 2005-01-26 2012-01-17 Honeywell International Inc. Standoff iris recognition system
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US8050463B2 (en) 2005-01-26 2011-11-01 Honeywell International Inc. Iris recognition system having image quality metrics
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US8285005B2 (en) 2005-01-26 2012-10-09 Honeywell International Inc. Distance iris recognition
US7761453B2 (en) 2005-01-26 2010-07-20 Honeywell International Inc. Method and system for indexing and searching an iris image database
US8064647B2 (en) 2006-03-03 2011-11-22 Honeywell International Inc. System for iris detection tracking and recognition at a distance
US8085993B2 (en) 2006-03-03 2011-12-27 Honeywell International Inc. Modular biometrics collection system architecture
US8049812B2 (en) 2006-03-03 2011-11-01 Honeywell International Inc. Camera with auto focus capability
US7933507B2 (en) 2006-03-03 2011-04-26 Honeywell International Inc. Single lens splitter camera
US8442276B2 (en) 2006-03-03 2013-05-14 Honeywell International Inc. Invariant radial iris segmentation
US8761458B2 (en) 2006-03-03 2014-06-24 Honeywell International Inc. System for iris detection, tracking and recognition at a distance
JP2007272435A (en) * 2006-03-30 2007-10-18 Univ Of Electro-Communications Face feature extraction device and face feature extraction method
US8063889B2 (en) 2007-04-25 2011-11-22 Honeywell International Inc. Biometric data collection system
US8436907B2 (en) 2008-05-09 2013-05-07 Honeywell International Inc. Heterogeneous video capturing system
US8213782B2 (en) 2008-08-07 2012-07-03 Honeywell International Inc. Predictive autofocusing system
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US8472681B2 (en) 2009-06-15 2013-06-25 Honeywell International Inc. Iris and ocular recognition system using trace transforms
US8630464B2 (en) 2009-06-15 2014-01-14 Honeywell International Inc. Adaptive iris matching using database indexing
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