CN110826451A - Iris image acquisition device and acquisition method - Google Patents
Iris image acquisition device and acquisition method Download PDFInfo
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- CN110826451A CN110826451A CN201911045123.6A CN201911045123A CN110826451A CN 110826451 A CN110826451 A CN 110826451A CN 201911045123 A CN201911045123 A CN 201911045123A CN 110826451 A CN110826451 A CN 110826451A
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- iris
- iris image
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- light source
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
- G06V40/19—Sensors therefor
Abstract
The invention discloses an iris image acquisition device, which comprises a control component, a light source, an image acquisition component and a data processing component, wherein the control component is connected with the light source; the control assembly is configured to control the light source to emit light to the eyes of the user; the image acquisition assembly comprises a rotating piece, a first linear polaroid and an imaging module; the rotating piece is configured to drive the first linear polaroid to rotate; the imaging module is configured to image light reflected by the eyes and/or glasses of the user passing through the first linear polarizer to generate an iris image; the control component is configured to control the rotating part to drive the first linear polaroid to rotate and control the imaging module to collect a plurality of iris images in the rotating process; the data processing component is configured to select an iris image to be recognized from the acquired plurality of iris images. The iris image acquisition device can acquire a plurality of iris images, and selects the iris images with weakened glasses reflected light, so that the iris identification success rate is improved.
Description
Technical Field
The invention relates to the technical field of biological feature recognition. And more particularly, to an iris image acquisition apparatus and an iris image acquisition method.
Background
The iris is located in the middle layer of the eyeball and between the sclera and the pupil, and is of an annular three-dimensional structure. When the intensity of the external light changes, the iris can automatically stretch and contract, so that the diameter of the pupil changes to adapt to the external light intensity. The iris is generally characterized by texture, pot holes, spots and the like, and the iris identification technology is used for determining the identity of a person by comparing the similarity between features of iris images. Therefore, how to acquire clear and interference-free iris images is a key step in the center of the iris identification technology.
The main principle of the existing iris image acquisition device is that a light source with specific wavelength is used for illuminating the human eye area, and then an imaging sensor is used for acquiring an iris image. The iris image acquisition device has poor imaging effect on people wearing glasses, and the main reason is that the surfaces of the glasses lenses are extremely smooth, the reflection effect on light is specular reflection, and iris textures shot by an imaging sensor are diffuse reflection imaging. Therefore, the light emitted by the light source in the iris image acquisition device is far stronger than the diffuse reflection of the iris texture after being reflected by the glasses lens, and the acquired image has strong glasses reflection interference, so that the iris identification success rate can be greatly reduced. In addition, because the position of the person to be collected cannot be completely fixed when the image collecting device is actually used, and the position and the angle of the glasses lens are not fixed, the polarization direction of the reflected light of the glasses lens is difficult to accurately calculate, and the interference of the reflected light of the glasses cannot be accurately weakened.
Therefore, in order to overcome the technical defects in the prior art, a novel iris image acquisition device and an acquisition method thereof need to be provided.
SUMMARY OF THE PATENT FOR INVENTION
One of the objectives of the present invention is to provide an iris image collecting device, which can collect a plurality of iris images at a time, and select an iris image from the iris images with the reflected light of the glasses attenuated, thereby facilitating the improvement of the success rate of iris recognition.
In order to achieve one of the above objects, the present invention provides an iris image capturing apparatus, comprising: the device comprises a control component, a light source, an image acquisition component and a data processing component; the control assembly is configured to control the light source to emit light to the eyes of a user; the image acquisition assembly comprises a rotating piece, a first linear polaroid and an imaging module, wherein the first linear polaroid is positioned on the rotating piece; the rotating piece is configured to drive the first linear polaroid to rotate; the imaging module is configured to image light reflected by the eyes and/or glasses of the user passing through the first linear polarizer to generate an iris image; the control component is configured to control the rotating part to drive the first linear polarizer to rotate, and control the imaging module to acquire a plurality of iris images in the rotating process; the data processing component is configured to select an iris image to be recognized from the acquired plurality of iris images.
Preferably, the rotating member is configured to rotate the first linear polarizer 360 degrees.
Preferably, the light source is an infrared light source.
Preferably, the infrared light source comprises a plurality of infrared LEDs with the emission center wavelength of 850-.
Preferably, the image capturing assembly further includes a filter disposed in front of the imaging module, and a minimum light transmission wavelength value of the filter is 760-800 nm.
Preferably, the iris image collecting device further comprises a second linear polarizer configured to change light emitted from the light source into linearly polarized light.
Preferably, the polarization direction of the second linearly polarizing plate is a horizontal direction or a vertical direction.
Preferably, the control component is one or a combination of more of an embedded system, a Windows system and an Android system.
Preferably, the imaging module comprises an optical lens and an optical camera; the optical lens is configured to image the captured iris region on a photosensitive chip of the optical camera; the optical camera is configured to image the iris region.
According to another object of the present invention, there is provided an iris image capturing method of the iris image capturing apparatus as described above, comprising the steps of:
s1, controlling the light source to emit light to the eyes of the user;
s2, controlling the rotating piece to drive the first linear polaroid to rotate, and controlling the imaging module to collect a plurality of iris images in the rotating process;
and S3, selecting the iris image to be recognized from the iris images.
The beneficial effects of the invention are as follows:
the iris image acquisition device provided by the invention can acquire a plurality of iris images in the rotation process of the first linear polaroid by arranging the first linear polaroid and the imaging module, and selects the iris image with weakened glasses reflected light from the iris images, so that the condition that the polarization direction of the glasses reflected light cannot be determined due to unfixed position and unfixed angle of a user can be avoided, the glasses reflected light is accurately weakened, the interference of the glasses reflected light is effectively reduced, and the success rate of iris identification is favorably improved; in addition, the iris image acquisition device provided by the invention further improves the polarization characteristic of part of polarized light reflected by the mirror surface through the synergistic action of the optical filter, the infrared light source and the second linear polarizer, is favorable for eliminating the interference of reflected light of glasses, can effectively eliminate the influence of visible light, and further improves the success rate of iris recognition.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic working flow diagram of an iris image acquisition device provided by the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is intended to be illustrative and not restrictive, and should not be taken to limit the scope of the invention.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
The iris image acquisition device among the prior art is relatively poor to the people who wears glasses formation of image effect, and the leading cause is that glasses lens surface is extremely smooth, is specular reflection to the reflection effect of light, and the iris texture that imaging sensor shot is the diffuse reflection formation of image. Therefore, the light emitted by the light source in the existing iris image acquisition device is far stronger than the diffuse reflection of iris textures after being reflected by the glasses lens, so that the acquired image has strong glasses reflection interference, and the iris identification success rate can be greatly reduced; in addition, because the position of the collected person cannot be completely fixed when the image collecting device is actually used, and the position and the angle of the spectacle lens are also not fixed, the polarization direction of the reflected light of the spectacle lens is difficult to accurately calculate through the brewster's law, and the interference of the reflected light of the spectacle cannot be accurately weakened.
In order to overcome the technical defects, the invention provides an iris acquisition device, as shown in fig. 1, the device comprises a control component 10, a light source 20, an image acquisition component 30 and a data processing component; the control assembly 10 is configured for controlling the light source 20 to emit light towards the eyes of a user; the image acquisition assembly 30 comprises a rotating member 31, a first linear polarizer 32 positioned on the rotating member 31, and an imaging module 33; the rotating member 31 is configured to rotate the first linear polarizer 32; preferably, the rotating member 31 is configured to rotate the first linear polarizer 32 360 degrees in the horizontal plane of the first linear polarizer 32. The first linear polarizer 32 is used to block light with a polarization direction perpendicular to the polarization direction of the first linear polarizer 32 from entering the imaging module 33, so as to weaken the reflected light of the glasses mirror. The rotating member may preferably be a rotating device driven by a motor, and the rotating device includes a groove capable of accommodating and fixing the first linear polarizer, and the rotating device is driven by the motor to rotate, so as to drive the first linear polarizer to rotate. The imaging module 33 is configured to image light reflected by the user's eyes and/or glasses through the first linear polarizer 32 to generate an iris image; preferably, the imaging module comprises an optical lens and an optical camera; the optical lens is configured to image the captured iris region on a photosensitive chip of the optical camera; the optical camera is configured to image the iris region. The photosensitive chip of the optical camera may preferably be a CCD or CMOS image sensor, and the number of pixels is not less than 640 × 480. The control assembly 10 is configured to control the rotating member 31 to rotate the first linear polarizer 32, and control the imaging module 33 to capture a plurality of iris images during the rotation. Preferably, the control component is one or a combination of more of an embedded system, a Windows system and an Android system. The rotating member 31 is connected with the control assembly 10 through a signal line. The imaging module 33 is connected with the control component 10 through a signal line. The data processing component is configured to select an iris image to be recognized from the acquired plurality of iris images, for example, by selecting an iris image with the minimum light intensity as the iris image to be recognized.
The working principle of the iris image collecting device provided by the present invention is explained with reference to fig. 1, and it can be known from brewster's law that the light reflected by the mirror surface of the glasses is partially polarized light, the polarization direction of which is determined by the incident angle and the reflection angle, and the light diffusely reflected by the iris region is unpolarized light. Partially polarized light refers to light rays that contain light vectors in various vibration directions in a plane perpendicular to the direction of light propagation, but where light vibration is more pronounced in a certain direction. The linear polarizer has the functions of shielding and transmitting incident light, so that the light becomes linearly polarized light after passing through the linear polarizer. It can also be understood that when polarized light passes through the linear polarizer, if the polarization direction of the polarized light is parallel to and coincident with the polarization direction of the linear polarizer, the polarized light is hardly blocked and can pass directly, and the linear polarizer plays a role of transmission. However, if the polarization direction of the polarized light is perpendicular to the polarization direction of the linear polarizer, the polarized light hardly passes through the linear polarizer, and the linear polarizer plays a role of shielding. Therefore, the iris image collecting device provided by the invention is provided with the first linear polarizer 32, the rotating member 31 and the imaging module 33, when the iris collecting device works, light rays are emitted to the eyes of a user by the light source 20, if the user wears glasses, part of the light rays can irradiate the glasses mirror surface of the user, become partial polarized light through mirror surface reflection and reach the first linear polarizer 32, the other part of the light rays can irradiate the iris of the user, still become non-polarized light through diffuse reflection and reach the first linear polarizer 32, meanwhile, the control module 10 controls the rotating member 31 to drive the first linear polarizer 32 to rotate, and the imaging module 33 images the light rays which pass through the first linear polarizer 32 and are reflected by the eyes and/or the glasses of the user in the rotating process so as to generate a plurality of iris images. When the first linear polaroid rotating to a certain angle is perpendicular to the polarization direction of the partial polarized light reflected by the mirror surface of the glasses, the first linear polaroid can effectively weaken the partial polarized light reflected by the mirror surface of the glasses, so that the imaging module can acquire an iris image after the reflected light of the glasses is weakened. And finally, selecting the iris image with the weakened reflection light of the glasses as the iris image to be identified by the data processing assembly through screening. The iris image acquisition device provided by the invention can acquire a plurality of iris images in the rotation process of the first linear polaroid, and select the iris image with weakened glasses reflected light from the iris images, and can avoid the condition that the polarization direction of the glasses reflected light cannot be determined due to unfixed position and unfixed angle of a user, accurately weaken the glasses reflected light, effectively reduce the interference of the glasses reflected light and be beneficial to improving the success rate of iris recognition.
Further preferably, the light source 20 is an infrared light source. Further preferably, the infrared light source comprises a plurality of infrared LEDs with the light-emitting center wavelength of 850-. In addition, the iris image acquisition device further comprises a second linear polarizer 40, wherein the second linear polarizer 40 is arranged in front of the light emitting direction of the light source 20, and the second linear polarizer 40 is configured to convert the light emitted by the light source 20 into linearly polarized light, so that the light emitted by the light source 20 can be irradiated to the eyes of the user after being converted into the linearly polarized light parallel to the polarization direction of the second linear polarizer 40 by the second linear polarizer 40. At this time, if the user wears glasses, the light irradiated onto the glasses and reaching the first linear polarizer 32 by specular reflection has a stronger polarization effect than the light reflected to the first linear polarizer 32 by specular reflection when only the first linear polarizer 32 is disposed without the second linear polarizer 40, and the polarization characteristics of the partially polarized light reflected by specular reflection are further improved; and another portion of the light will strike the user's iris and become unpolarized by diffuse reflection to reach the first linear polarizer 32. When the polarization direction of the first linear polarizer 32 is rotated to be perpendicular to the polarization direction of the specular reflection of the glasses, the preferred embodiment may attenuate the glasses-reflected light to a greater extent than an embodiment in which only the first linear polarizer 32 is disposed and the second linear polarizer 40 is not disposed. Preferably, the polarization direction of the second linearly polarizing plate 40 may be a horizontal direction or a vertical direction. In order to effectively eliminate the influence of visible light, the image capturing assembly further includes an optical filter 50 disposed in front of the imaging module 33, the optical filter 50 is located in front of the light entering direction of the imaging module 33, the optical filter 50 is preferably made of optical glass through a special coating, and the coating has the following characteristics: only allowing the light with the wavelength larger than a certain critical value to pass through, and blocking the light with the wavelength smaller than the critical value to pass through, wherein the minimum light transmission wavelength value of the optical filter is 760 nm and 800 nm. It can be understood that the filter 50 can be matched with the infrared light source, so that the filter can block visible light from passing through the filter, and light rays with specific wave bands emitted by the infrared light source can pass through the filter. Through the synergistic effect of the optical filter, the infrared light source and the second linear polaroid, the polarization characteristic of partial polarized light reflected by the mirror surface is further improved, the interference of reflected light of the glasses is eliminated, meanwhile, the influence of visible light can be effectively eliminated, and the success rate of iris recognition is further improved.
According to another aspect of the present invention, the present invention also provides an iris image capturing method of the iris image capturing apparatus, including the following steps:
s1, the control component 10 controls the light source 20 to emit light to the eyes of the user;
s2, the control module 10 controls the rotating member 31 to drive the first linear polarizer 32 to rotate, and controls the imaging module 33 to capture a plurality of iris images during the rotation process;
and S3, selecting the iris image to be recognized from the iris images by the data processing component.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. An iris image capturing apparatus, comprising:
the device comprises a control component, a light source, an image acquisition component and a data processing component;
the control assembly is configured to control the light source to emit light to the eyes of a user;
the image acquisition assembly comprises a rotating piece, a first linear polaroid and an imaging module, wherein the first linear polaroid is positioned on the rotating piece;
the rotating piece is configured to drive the first linear polaroid to rotate;
the imaging module is configured to image light reflected by the eyes and/or glasses of the user passing through the first linear polarizer to generate an iris image;
the control component is configured to control the rotating part to drive the first linear polarizer to rotate, and control the imaging module to acquire a plurality of iris images in the rotating process;
the data processing component is configured to select an iris image to be recognized from the acquired plurality of iris images.
2. An iris image collecting device as claimed in claim 1, wherein the rotating member is configured to rotate the first linear polarizer 360 degrees.
3. An iris image collecting device as claimed in claim 1, wherein the light source is an infrared light source.
4. An iris image collecting device as claimed in claim 3, wherein said infrared light source comprises several infrared LEDs with a central wavelength of 850-.
5. The iris image acquisition device as claimed in claim 1, wherein the image acquisition assembly further comprises a filter disposed in front of the imaging module, and the minimum light transmission wavelength value of the filter is 760-800 nm.
6. An iris image pickup device as claimed in claim 1, further comprising a second linear polarizer,
the second linearly polarizing plate is configured to change light emitted from the light source into linearly polarized light.
7. An iris image collecting device of claim 6, wherein the polarization direction of said second linear polarizer is a horizontal direction or a vertical direction.
8. The iris image acquisition device as claimed in claim 1, wherein the control component is one or more of an embedded system, a Windows system and an Android system.
9. An iris image collecting device of claim 1, wherein said imaging module comprises an optical lens and an optical camera;
the optical lens is configured to image the captured iris region on a photosensitive chip of the optical camera;
the optical camera is configured to image the iris region.
10. An iris image capturing method based on the iris image capturing apparatus as claimed in claims 1 to 9, comprising the steps of:
s1, controlling the light source to emit light to the eyes of the user;
s2, controlling the rotating piece to drive the first linear polaroid to rotate, and controlling the imaging module to collect a plurality of iris images in the rotating process;
and S3, selecting the iris image to be recognized from the iris images.
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| CN201911045123.6A CN110826451A (en) | 2019-10-30 | 2019-10-30 | Iris image acquisition device and acquisition method |
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2019
- 2019-10-30 CN CN201911045123.6A patent/CN110826451A/en active Pending
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| CN101008982A (en) * | 2006-01-27 | 2007-08-01 | 侯雨石 | Method and device for capturing iris without interference of spectacles |
| CN104573676A (en) * | 2015-02-02 | 2015-04-29 | 北京天诚盛业科技有限公司 | Iris identification device capable of preventing glasses reflect light interference |
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