CN115131870A - Iris image acquisition method - Google Patents
Iris image acquisition method Download PDFInfo
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- CN115131870A CN115131870A CN202110322411.2A CN202110322411A CN115131870A CN 115131870 A CN115131870 A CN 115131870A CN 202110322411 A CN202110322411 A CN 202110322411A CN 115131870 A CN115131870 A CN 115131870A
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Abstract
The invention provides an iris image acquisition method, which is used for acquiring iris images with uniform image quality, and the specific working flow comprises the following steps: providing a light source to regulate the size of the pupil; acquiring an iris image, and calculating a diameter ratio according to the iris image; judging the quality of the iris image according to the diameter ratio: when the diameter ratio is less than or equal to a fixed threshold value, acquiring an iris image; when the diameter ratio is larger than a fixed threshold value, sending an instruction for enhancing the illuminance of the visible light source to the iris acquisition unit; the iris acquisition unit acquires a real-time iris image and calculates a diameter ratio according to the real-time iris image; and when the real-time diameter ratio is smaller than a fixed threshold value, stopping enhancing the illuminance of the visible light source and collecting the iris image. The iris image quality is judged through the threshold value, the illuminance in the dark box is regulated and controlled according to the judgment result, the recorded iris image quality is improved, and the uniformity of the recorded iris image quality is ensured.
Description
Technical Field
The invention relates to the technical field of iris recognition, in particular to an iris image acquisition method.
Background
Iris recognition is an identification technique based on the iris in the eye. The iris is an annular segment between the black pupil and the white sclera, which contains many interlaced details of spots, filaments, crowns, stripes, crypts, etc., and the normal human pupil can reflectively adjust its own size. When the light is enhanced, the pupil is contracted; when the light is attenuated, the pupil is dilated. The contraction of the pupil can cause the expansion and stretching of the iris feature points, and from the view point of the image, the iris image acquired by the contraction of the pupil shows more iris texture detail features compared with the iris image in the normal or enlarged state of the pupil, so that the template feature sequence data generated by the iris image comprises more iris details, the identification accuracy is improved, and the false acceptance rate and the false rejection rate are reduced.
In the existing technical scheme, visible light is adopted to stimulate the pupil contraction of a user so as to enable the obtained iris image to contain more iris details, but different people have different pupil contraction states due to psychology, age, race, refraction state, light intensity, target distance and emotion change. In the existing iris input mode, different users have different pupil contraction states when acquiring irises, the obtained iris images have different texture information amounts and large differences, and the quality of the iris images cannot be guaranteed. When iris images are subsequently used for iris recognition, there are cases where the amount of detail information contained in a large number of iris images is small, and the iris recognition accuracy is reduced.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention provides an iris image acquisition method for effectively ensuring the uniformity of the quality of the input iris image.
Specifically, the iris image acquisition method is used for acquiring iris images with uniform image quality, and the specific working flow is as follows:
providing a light source to regulate the size of the pupil;
acquiring the iris image, and calculating a diameter ratio according to the iris image;
judging the quality of the iris image according to the diameter ratio: and when the diameter ratio is less than or equal to a fixed threshold value, acquiring the iris image.
Further, the step of providing a light source to regulate the pupil size refers to regulating the pupil size by adopting a visible light source; the step of judging the quality of the iris image according to the diameter ratio further comprises the following steps:
when the diameter ratio is larger than the fixed threshold value, sending an instruction for enhancing the illuminance of the first light source to the iris acquisition unit;
the iris acquisition unit acquires a real-time iris image and calculates a real-time diameter ratio according to the real-time iris image;
when the real-time diameter ratio is larger than the fixed threshold value, repeating the steps;
and when the real-time diameter ratio is less than or equal to the fixed threshold, stopping enhancing the illuminance of the visible light source, and collecting the iris image.
The "calculating a diameter ratio from the iris image" includes:
fitting an iris fitting circle and a pupil fitting circle in the iris image through a fitting algorithm;
calculating the number of diameter pixels of the iris fitting circle and the number of diameter pixels of the pupil fitting circle;
and dividing the number of diameter pixels of the pupil fitting circle by the number of diameter pixels of the iris fitting circle to obtain the diameter ratio.
The invention also provides an iris image acquisition system using the iris image acquisition method, which comprises the following steps:
an illumination module: a light source for providing light to stimulate pupil constriction;
an image acquisition module: the system is used for acquiring an iris image of a user;
a calculation module: the diameter ratio of the iris fitting circle and the pupil fitting circle in the iris image of the user collected by the image acquisition module is calculated;
an evaluation module: the diameter ratio is used for comparing the calculated diameter ratio with a fixed threshold value, and judging whether the size of the iris image meets the input requirement;
a storage module: the iris sample storage device is used for storing the iris sample meeting the recording requirement.
The illumination module comprises a first light source, and the first light source is used for regulating and controlling the size of the pupil.
The iris image acquisition system further comprises: an adjusting module: the system is used for adjusting the illuminance of the first light source, and when the calculated diameter ratio is larger than a fixed threshold value, the illuminance of the first light source is enhanced; and after the iris image input is finished, adjusting the first light source to the initial brightness for working.
An iris image acquisition device comprises iris acquisition equipment and computer equipment;
the iris acquisition apparatus includes: the light source assembly comprises a first light source and a second light source, the first light source is arranged in the corner area of the cassette, and the second light source is arranged around the infrared camera;
the iris acquisition equipment is connected with the computer equipment and is used for regulating and controlling the circuit of the iris acquisition equipment.
The frosted transparent structural part is arranged on the surface of the first light source, so that the illuminance in the collecting dark box is more uniformly distributed, and the discomfort caused by the direct irradiation of white light on the eyes of a user is reduced. Preferably, the frosted transparent structural member is in the shape of an annular bowl. The surface of the second light source covers the annular light filter, and an imaging point of the infrared light source on the eye is within the pupil when the iris image is seen, so that the iris feature point is prevented from being recognized by mistake.
In summary, the iris image acquisition method, system and device of the present invention compare the diameter ratio of the iris fitting circle and the pupil fitting circle calculated according to the iris image with a fixed threshold, determine whether the iris image meets the input requirement, and ensure the uniformity of the quality of the input iris image. Furthermore, the intensity of the illuminance in the cassette can be controlled according to the judgment result, more iris texture characteristics can be obtained, and the quality of the input iris image is improved. In addition, the iris acquisition device provided by the invention is provided with the light homogenizing piece on the surface of the white light source, so that the discomfort caused by the irradiation of the white light on the eyes of the user can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of an iris image acquisition method of the present invention;
FIG. 2 is a schematic diagram of an iris fitting circle and a pupil fitting circle in an iris image;
FIG. 3 is a schematic structural diagram of an iris image acquisition system using the iris image acquisition method of the present invention;
fig. 4 is a schematic view of the entire structure of an iris image acquisition apparatus of embodiment 3;
fig. 5 is a schematic view of a partial configuration of an iris image capturing apparatus according to embodiment 3.
Reference numerals:
1-an infrared camera; 21-a white light source; 22-a near infrared light source; 31-an annular infrared filter; 32-frosted transparent structural member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an iris image acquisition method, which is characterized in that a light source is arranged in a cassette for illumination to acquire more iris details, the ratio of a pupil to an iris is compared with a preset threshold value to judge whether the iris image meets a preset standard, and the iris image is recorded after the size of the iris of a user is regulated and controlled by the illuminance in the cassette through an iris algorithm until the iris image meets the preset standard, so that the quality uniformity of the recorded iris image is ensured.
Example 1
Referring to the attached figure 1 of the specification, the specific working flow of the iris image acquisition method is as follows:
and opening the iris recording software, and automatically lighting the first light source and the second light source in the dark box of the iris acquisition device and working under the preset initial brightness. The first light source is used for regulating and controlling the size of the pupil of the user, and the second light source is used for supplementing light of the iris image. Specifically, the iris image acquired under ambient light is compared with a preset standard of the iris image, the iris image acquisition conditions of more than a certain number of people are counted, the optimal brightness of the acquired iris image is obtained through analysis, and the optimal brightness is determined as the initial brightness.
The iris acquisition unit acquires an iris image, analyzes the iris image in real time and calculates a diameter ratio according to the iris image. Specifically, referring to the attached figure 2 of the specification, a fitting circle of the iris and a fitting circle of the pupil in the current iris image are fitted through a fitting algorithm, the number r1 of diameter pixels of the iris fitting circle and the number r2 of diameter pixels of the pupil fitting circle can be calculated, and the diameter ratio I is obtained by dividing r2 by r 1.
And judging the quality of the iris image according to the diameter ratio I. Specifically, judging whether the diameter ratio I is less than or equal to a fixed threshold I', if so, recording the current iris image and realizing iris sample storage by combining with other iris input requirements; if not, sending an instruction for enhancing the illuminance of the first light source to the iris acquisition unit, so that the illuminance in the dark box can rise, acquiring a real-time iris image by the iris acquisition unit, calculating a real-time diameter ratio according to the real-time iris image until the real-time diameter ratio I is less than or equal to a fixed threshold value I', stopping enhancing the illuminance of the first light source, recording the iris image, and combining with other iris input requirements to realize iris sample storage.
After the recording is finished, an instruction is sent to the iris acquisition unit to reduce the first light source to the initial brightness for working.
Example 2
This embodiment is an iris image capturing system using the iris image capturing method provided in embodiment 1.
Referring to fig. 3 of the specification, the iris image acquisition system comprises:
an illumination module: the device comprises a light source and a supplementary light source, wherein the light source is used for providing a light source for stimulating pupil contraction and a supplementary light source;
an image acquisition module: the system is used for acquiring an iris image of a user;
a calculation module: the system is used for calculating the diameter ratio of a fitting circle of the iris and a fitting circle of the pupil in the iris image of the user, which is acquired by the image acquisition module;
an evaluation module: the diameter ratio is used for comparing the calculated diameter ratio with a fixed threshold value, and judging whether the size of the iris image meets the input requirement;
an adjusting module: the device is used for adjusting the illuminance of the first light source, and when the calculated diameter ratio is larger than a fixed threshold value, the illuminance of the first light source is enhanced; after the iris image is recorded, adjusting the first light source to the initial brightness for working;
a storage module: the iris sample storage device is used for storing the iris sample meeting the recording requirement.
Example 3
The embodiment provides an iris acquisition device using the iris image acquisition method provided in embodiment 1, and the iris acquisition device comprises iris acquisition equipment and a computer connected with the iris acquisition equipment.
Referring to the attached figure 4 of the specification, the iris acquisition equipment is a cassette structure which accords with the ergonomic design, an infrared camera 1 used for acquiring an iris image is arranged in the cassette, the iris image pixels acquired by the infrared camera 1 are not less than 640 multiplied by 480, the bit depth of pixel points is not less than 8 bits, the diameter of the acquired iris is not less than 200 pixels, and the resolution ratio in an effective acquisition area is not less than 4 lp/mm. The light source assembly comprising a white light source 21 and a near-infrared light source 22 is arranged in the cassette structure, wherein the white light source 21 is used for regulating and controlling the size of the pupil of a user, and the near-infrared light source 22 is used for supplementing light of an iris image.
Referring to the attached figure 5 of the specification, the infrared illumination light source is covered by an annular infrared filter 31, the lens of the infrared camera 1 is arranged in the center of the annular infrared filter 31 and is tightly attached to the lens of the infrared camera 1 for a circle, and the imaging point of the infrared light source on the eye is seen from the iris image and is located in the pupil, so that the iris feature point is prevented from being recognized by mistake. The white light source 21 does not directly irradiate the iris and the face of a user and is distributed in the corner area in the cassette, the annular bowl-shaped frosted transparent structural part 32 covers the upper surface of the white light source 21, the frosted plastic structural part enables the illuminance in the collecting cassette to be more uniformly distributed, and the discomfort caused by the fact that the white light directly irradiates the eyes of the user is reduced. In the embodiment, four near-infrared light sources 22 are arranged to be distributed around the lens of the infrared camera 1, and two pairs of white light sources 21 are arranged at the cassette boundaries on the upper and lower sides of the infrared camera 1. Preferably, two groups of infrared cameras 1, a white light source 21, a near infrared light source 22 and an annular infrared filter 31 are arranged, two annular bowl-shaped frosted transparent structural parts 32 are arranged to form two iris collecting channels in a dark box of the iris collecting equipment, the space between the two binocular irises is isolated, and the influence of the infrared light source on the other side on the iris image on the side is prevented. The iris acquisition equipment is connected with a computer device through a circuit interface, and is powered by the computer device, and the circuit of the iris acquisition equipment is regulated and controlled by an iris input system of the computer device.
When the iris acquisition device of the embodiment is used for acquiring the iris image, the iris acquisition equipment is connected with the computer equipment. And (3) turning on the iris recording system, automatically lighting the white light source 21 and the near infrared light source 22 at the moment, working at a preset initial brightness, and tightly attaching the face of the user to the iris collecting equipment conforming to the human engineering to collect the iris. After the infrared camera 1 acquires the iris image, iris input software analyzes the iris image in real time: and fitting a fitting circle of the iris and a fitting circle of the pupil in the current iris image through a fitting algorithm, simultaneously calculating the number r1 of diameter pixels of the iris fitting circle and the number r2 of diameter pixels of the pupil fitting circle, and dividing r2 by r1 to obtain a diameter ratio I. And the iris input software sets a fixed threshold I ', compares the calculated diameter ratio I with the fixed threshold I', and judges whether the currently acquired iris image meets the iris image input requirement. If the diameter ratio I is larger than the fixed threshold I ', the iris input software sends an instruction for enhancing the illuminance of the white light source 21 to the iris acquisition equipment, the infrared camera 1 continues to acquire iris images while the illuminance in the iris acquisition equipment rises, and the iris input software calculates the diameter ratio I and compares the diameter ratio I with the fixed threshold I ' until the diameter ratio I is smaller than or equal to the fixed threshold I ', and then stops. At the moment, iris input software records the currently acquired iris image and realizes iris sample storage by combining with other iris input requirements. After iris entry is complete, the iris algorithm sends an instruction to the iris acquisition device to reduce the white light source 21 to an initial set brightness. If the iris recording software is closed, the white light source 21 and the near infrared light source 22 are turned off.
In summary, the iris image acquisition method and system provided by the invention compare the diameter ratio of the iris fitting circle and the pupil fitting circle calculated according to the iris image with a fixed threshold value, judge whether the iris image meets the input requirement, and ensure the uniformity of the input iris image quality. Furthermore, the intensity of the illuminance in the cassette can be controlled according to the judgment result, so that more iris texture features can be acquired, and the quality of the input iris image is improved. In addition, the iris acquisition device provided by the invention is provided with the light homogenizing piece on the surface of the white light source, so that the discomfort caused by the irradiation of white light on the eyes of a user can be reduced, meanwhile, the space between the two eye irises can be isolated, the influence of the infrared light source on the other side on the iris image on the side is prevented, and the use feeling and the quality of the acquired iris image are improved.
The above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and various modifications other than the above-mentioned embodiments may be made, and the technical features of the above-mentioned embodiments may be combined with each other, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An iris image collecting method is used for collecting iris images with uniform image quality,
providing a light source to regulate the size of the pupil;
acquiring an iris image, and calculating a diameter ratio according to the iris image;
judging the quality of the iris image according to the diameter ratio: and when the diameter ratio is less than or equal to a fixed threshold value, acquiring the iris image.
2. An iris image collecting method according to claim 1, wherein said "calculating a diameter ratio from said iris image" includes:
fitting an iris fitting circle and a pupil fitting circle in the iris image through a fitting algorithm;
calculating the number of diameter pixels of the iris fitting circle and the number of diameter pixels of the pupil fitting circle;
and dividing the number of diameter pixels of the pupil fitting circle by the number of diameter pixels of the iris fitting circle to obtain the diameter ratio.
3. An iris image collecting method according to claim 1, wherein said "providing a light source to regulate the size of the pupil" is to regulate the size of the pupil by using a visible light source;
the step of judging the quality of the iris image according to the diameter ratio further comprises the following steps:
when the diameter ratio is larger than the fixed threshold value, the illuminance of the visible light source is enhanced
The iris acquisition unit acquires a real-time iris image and calculates a real-time diameter ratio according to the real-time iris image;
when the real-time diameter ratio is larger than the fixed threshold value, repeating the steps;
and when the real-time diameter ratio is less than or equal to the fixed threshold, stopping enhancing the illuminance of the visible light source, and collecting the iris image.
4. An iris image acquisition system for performing the method of any one of claims 1 to 3, comprising:
an illumination module: a light source for providing light to stimulate pupil constriction;
an image acquisition module: the system is used for acquiring an iris image of a user;
a calculation module: the diameter ratio of the iris fitting circle and the pupil fitting circle in the iris image of the user acquired by the image acquisition module is calculated;
an evaluation module: the diameter ratio is used for comparing the calculated diameter ratio with a fixed threshold value, and judging whether the size of the iris image meets the input requirement;
a storage module: the iris sample storage device is used for storing the iris sample meeting the recording requirement.
5. An iris image acquisition system of claim 4, wherein the illumination module comprises a first light source for regulating pupil size.
6. An iris image acquisition system as claimed in claim 5, further comprising:
an adjusting module: the device is used for adjusting the illuminance of the first light source, and when the calculated diameter ratio is larger than a fixed threshold value, the illuminance of the first light source is enhanced; and after the iris image input is finished, adjusting the first light source to the initial brightness.
7. An iris image acquisition device is characterized by comprising iris acquisition equipment and computer equipment;
the iris acquisition apparatus includes: the light source assembly comprises a first light source and a second light source, the first light source is arranged in the corner area of the cassette, and the second light source is arranged around the infrared camera;
the iris acquisition equipment is connected with the computer equipment and is used for regulating and controlling the circuit of the iris acquisition equipment.
8. An iris image capture device of claim 7 wherein the first light source surface is provided with a frosted clear structural member.
9. An iris image capture device of claim 8, wherein the frosted transparent structural member is annular bowl-shaped.
10. An iris image collecting device of claim 7, wherein the second light source surface is covered with an annular filter.
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|---|---|---|---|
| CN202110322411.2A CN115131870A (en) | 2021-03-25 | 2021-03-25 | Iris image acquisition method |
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| CN202110322411.2A CN115131870A (en) | 2021-03-25 | 2021-03-25 | Iris image acquisition method |
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- 2021-03-25 CN CN202110322411.2A patent/CN115131870A/en active Pending
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