CN110443160B - Iris collection method and device - Google Patents
Iris collection method and device Download PDFInfo
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- CN110443160B CN110443160B CN201910649295.8A CN201910649295A CN110443160B CN 110443160 B CN110443160 B CN 110443160B CN 201910649295 A CN201910649295 A CN 201910649295A CN 110443160 B CN110443160 B CN 110443160B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
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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 provides an iris acquisition method and device, wherein the iris acquisition device comprises a first light source and a second light source; the divergence angles of the first light source and the second light source are different; detecting distance information of a user object when the user object exists in a detection area of the iris acquisition device; in a preset identifiable area of the iris acquisition device, adjusting light intensity control parameters of the first light source and the second light source according to the distance information so as to obtain preset light intensity by superposing light of the first light source and the second light source at the imaging distance of the user object; an iris image of a user subject is acquired at a predetermined illumination intensity. According to the present invention, it is possible to automatically recognize distance information within a large recognition distance, adjust the illumination intensity according to the distance information, and obtain a predetermined illumination intensity at the distance. The first light source and the second light source with different divergence angles are adopted, so that a user object can obtain infrared illumination with uniform brightness at different distances, and an iris image is acquired.
Description
Technical Field
The invention relates to an iris imaging technology, in particular to an iris acquisition method and device.
Background
With the development of iris imaging technology, the imaging distance of an iris camera has been developed from an initial single distance to have a depth of field range of 10cm, 15cm or even wider, and a foundation is laid for extending the identification distance. However, the intensity of a single illumination light source is difficult to collect the irises at various distances such as near distance, middle distance and far distance, and the phenomena of overhigh brightness of images with near-distance illumination intensity, uneven long-distance illumination, weak illumination, fuzzy iris textures and the like are caused.
In order to be suitable for various distances, the iris acquisition device in the prior art also has the illumination light sources with various types and different divergence angles, and the illumination mode has the advantages of large number of lamps, poor heat dissipation effect, large PCB (printed circuit board) layout area, increased circuit design complexity and high cost.
Therefore, it is desirable to invent an iris collecting apparatus or method to solve or alleviate the problems of uneven illumination or excessive illumination sources in the prior art.
Disclosure of Invention
In view of this, the present invention provides an iris collecting method and device, so as to solve or alleviate the problem that the iris collecting device in the prior art is not uniform in illumination at different distances or adopts too many illumination light sources.
In order to achieve the purpose, the invention adopts the following scheme:
according to an aspect of the present invention, there is provided an iris collecting method of an iris collecting apparatus including a first light source and a second light source, the first light source and the second light source being assembled as an integrated infrared lamp, a divergence angle of the first light source being greater than a divergence angle of the second light source; when a user object exists in the detection area of the iris acquisition device, detecting distance information between the user object and the iris acquisition device; in a preset identifiable area of the iris acquisition device, adjusting light intensity control parameters of the first light source and the second light source according to the distance information so as to obtain preset light intensity by superposition of light of the first light source and the second light source at an imaging distance of a user object; and acquiring an iris image of the user object under the preset illumination intensity.
In some embodiments, the first light source is at least one infrared light source and the second light source is at least one infrared light source.
In some embodiments, the first light source and the second light source are arranged side to side or top to bottom; or the first light source and the second light source are arranged symmetrically.
In some embodiments, the first light source has a divergence angle greater than a divergence angle of the second light source, and the second light source is a plurality of light sources uniformly arranged around the first light source.
In some embodiments, the method further comprises: determining whether the user object is in the recognizable area according to the distance information; and when the user object is not located in the recognizable area, sending out prompt information to remind the user object to move to the recognizable area.
In some embodiments, the light intensity control parameter is current intensity, and the iris acquisition device stores a correspondence table between distance information and the current intensities of the first light source and the second light source; the step of adjusting the light intensity control parameters of the first light source and the second light source according to the distance information comprises: determining and adjusting the current value of the first light source and the current value of the second light source corresponding to the detected distance information according to the corresponding relation table; the current intensity of the first light source is negatively correlated with the distance information, and the current intensity of the second light source is positively correlated with the distance information.
In some embodiments, the light intensity control parameter is current intensity; the step of adjusting the light intensity control parameters of the first light source and the second light source according to the distance information comprises: and calculating the current intensity of the first light source and the current intensity of the second light source according to the distance information. The current intensity of the first light source is negatively correlated with the distance information, and the current intensity of the second light source is positively correlated with the distance information.
In some embodiments, when the distance information is a minimum value of the recognizable area, the current intensity of the first light source is adjusted to be maximum, and the current intensity of the second light source is adjusted to be minimum. When the distance information is the maximum value of the identifiable region, the current intensity of the first light source is adjusted to be minimum, and the current intensity of the second light source is adjusted to be maximum.
In some embodiments, the recognizable area of the iris acquisition device is in the range of 30 to 80cm in front thereof.
In some embodiments, the distance information is obtained from the result of human eye positioning by the iris acquisition device.
In some embodiments, the first light source and the second light source are arranged side to side or top to bottom.
According to another aspect of the present invention, there is also provided an iris collecting apparatus including a light source module, a distance detecting module, a control module, and an image collecting module. The light source module comprises a first light source and a second light source, and the divergence angle of the first light source is larger than that of the second light source; the distance detection module is used for detecting the distance information between the user object and the iris acquisition device; the control module adjusts light intensity control parameters of the first light source and the second light source according to the distance information so that the preset illumination intensity is obtained by overlapping illumination of the first light source and the second light source at the imaging distance of the user object; the image acquisition module acquires an iris image under the preset illumination intensity.
In some embodiments, the first and second light sources are assembled as a unitary infrared lamp.
In some embodiments, when the user object is located in the recognizable area of the iris collecting device and the distance between the user object and the iris collecting device is changed from near to far, the light intensity of the first light source is gradually reduced, and the light intensity of the second light source is gradually increased.
According to the iris acquisition method and device, the distance information of the user object can be automatically identified within a larger identification distance, and the illumination intensity of the illumination light source is adaptively adjusted according to the distance information, so that the preset illumination intensity is obtained at the distance space of the user object. In addition, the illumination light source adopts the first light source and the second light source with different divergence angles, and can obtain stable preset illumination intensity at different distance spaces in the identifiable area by overlapping the illumination intensity of the first light source and the illumination intensity of the second light source. The iris of the user object can obtain infrared illumination with uniform brightness at different distances without exceeding the use range of the iris acquisition device, and the iris image with uniform brightness is acquired.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic illustration of an iris acquisition method according to some embodiments of the present invention;
FIG. 2 is a schematic view of a portion of a flow chart of an iris acquisition method according to an embodiment of the present invention;
FIG. 3 is a graph of distance information versus illumination intensity for some embodiments of the present invention;
FIG. 4 is a schematic illustration of the principle of illumination of two divergent angle sources according to some embodiments of the present invention;
FIG. 5 is a schematic illustration of the left and right distribution of light sources at various divergence angles in accordance with some embodiments of the present invention;
FIG. 6 is a schematic illustration of user objects of some embodiments of the present invention located at two extremes of a recognizable area;
FIG. 7 is a schematic illustration of a user object of some embodiments of the inventions located in an intermediate position in a recognizable area;
fig. 8 is a schematic structural diagram of an iris acquisition device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
In view of the problems that the iris acquisition device or method in the prior art often has uneven illumination or adopts too many illumination light sources when the iris acquisition device or method is in a large identification distance, the inventor of the present invention provides an iris acquisition method and device, which can overcome or make up for the defects that the iris acquisition method in the prior art has uneven illumination or adopts too many illumination light sources.
Fig. 1 is a schematic illustration of an iris acquisition method according to some embodiments of the present invention. As shown in FIG. 1, in some embodiments, the iris acquisition method implemented by the iris acquisition device of the present invention uses two divergent angle light sources for illumination. The light source of the iris acquisition device comprises a first light source and a second light source, wherein the divergence angles of the first light source and the second light source are different and correspond to different optimal iris imaging infrared lighting distances. As an example, the divergence angle of the first light source is larger than the divergence angle of the second light source. The method as shown in fig. 1 comprises the following steps:
step S110: when a user object exists in a detection area of the iris acquisition device, distance information between the user object and the iris acquisition device is detected. The distance information may be obtained by the iris acquisition device through a human eye detection algorithm or measured by a distance sensor, which may be, for example, an infrared distance sensor, an ultrasonic distance sensor, or the like, but the present invention is not limited thereto.
Step S120: and in a preset identifiable region of the iris acquisition device, adjusting light intensity control parameters of the first light source and the second light source according to the distance information, so that at the imaging distance of the user object, the preset illumination intensity is obtained by overlapping illumination of the first light source and the second light source. The light intensity control parameter may be a current intensity, a voltage, or the like. It will be appreciated that the predetermined illumination intensity described herein is generally an illumination intensity at which the iris imaging meets the image specification criteria.
This step may be performed if the user object is located within the detection zone and within the identifiable zone. If the user object is located in the detection area but not located in the recognizable area, prompt information can be sent to prompt the user object to move into the recognizable area, so that the iris acquisition can be carried out smoothly.
According to this step, the light emission intensities of the two light sources with different divergence angles can be adjusted according to the distance between the user object and the light source, for example, the closer the user object is to the light source, the greater the contribution of the light source with the large divergence angle to the illumination intensity, and the smaller the contribution of the light source with the small divergence angle to the illumination intensity, whereas, the farther the user object is from the light source, the greater the contribution of the light source with the small divergence angle to the illumination intensity, and the smaller the contribution of the light source with the large divergence angle to the illumination intensity, so that the illumination intensities obtained at the imaging distance where the user object is located by superimposing the illumination of the first light source and the illumination of the second light source are substantially constant.
Step S130: an iris image of a user subject is acquired at a predetermined illumination intensity.
According to the iris acquisition method, the distance information of the user object can be automatically detected within a larger identification distance, and the illumination intensity of the illumination light source is adaptively adjusted according to the distance information, so that the preset illumination intensity is obtained at the distance space where the user object is located. In addition, the illumination light source adopts the first light source and the second light source with different divergence angles, and can obtain stable preset illumination intensity at different distance spaces in the identifiable area by overlapping the illumination intensity of the first light source and the illumination intensity of the second light source. The iris of the user object can obtain infrared illumination with uniform brightness at different distances without exceeding the use range of the iris acquisition device, and the iris image with uniform brightness is acquired.
In some embodiments of the present invention, the iris acquisition method may further include a reminding step between steps S110 and S120:
and judging whether the user object is in the recognizable area of the iris acquisition device or not according to the distance information. For example, if the distance between the user object and the iris acquisition device is in the range of 30 to 80cm, it may be determined that the user object is within the recognizable region of the iris acquisition device.
And when the user object is not located in the identification area of the iris acquisition device, sending prompt information to remind the user object to move to the identification area.
For example, when the distance information of the user object from the iris acquisition device is measured not to be within the range of the recognizable area, the user object is far away or near from the iris acquisition device, and the iris acquisition device reminds the user object to move to the recognizable area by sending out prompt information. The prompt message includes but is not limited to voice broadcast, text prompt, video image, indicator light color, and other one or more combinations.
In the iris collecting method of the present invention, in step S120, the light intensity control parameters of the first light source and the second light source are adjusted according to the distance information, where the manner of adjusting the light intensity control parameters may be to look up the corresponding light intensity control parameters based on the corresponding relationship table of the distance information and the light intensity control parameters of each light source pre-stored by the iris collecting device, or to calculate the light intensity control parameters of the first light source and the second light source by using an algorithm according to the detected distance information. Under the condition that the light intensity control parameter is the current intensity, the iris acquisition device can store a corresponding relation table of the distance information and the current intensities of the first light source and the second light source. And finding out the corresponding current value of the first light source and the current value of the second light source from the corresponding relation table according to the detected distance information. The current of the first light source and the second light source can then be adjusted using the light source driving module to obtain a predetermined illumination intensity at the distance position. Alternatively, the current intensity for controlling the current intensity of the first light source and the current intensity for controlling the illumination intensity of the second light source may be calculated using a predetermined algorithm according to the detected distance information. The current intensity of the first light source is in negative correlation with the distance information (the divergence angle of the first light source is larger than that of the second light source), the current intensity of the second light source is in positive correlation with the distance information, and a mathematical model of the current intensity and the distance can be determined according to the corresponding mode, so that the current is calculated. For example, according to the distance-illuminance correspondence shown in fig. 3, it can be found that the illuminance of the light source or the illuminance and the distance at the predetermined position are approximately in a linear variation relationship, where the illuminance of the first light source (large angle light source) is in a positive correlation and the illuminance of the second light source (small angle light source) is in a negative correlation, and according to the distance-illuminance linear variation correspondence, the illuminance at a certain distance position can be calculated, so as to determine the current intensity values of the first light source and the second light source.
In some embodiments of the invention, the identifiable region of the iris acquisition device is in the range of 30cm to 80cm in front of the iris acquisition device. It is understood that the front of the iris collecting device can be identified by the iris collecting device, and the front of the iris collecting device can also be identified by the position of the illumination light source, and the area is along the illumination direction of the illumination light source. In addition, if the user object is generally in a standing or sitting posture, the iris-off-ground height should also be considered so that the illumination light source of the iris collecting apparatus and the image collecting apparatus correspond thereto.
In order to understand the iris acquisition method of the present invention, the following explains some specific values or steps that the method of the present invention may include in conjunction with specific embodiments, and the sequence of steps involved in each embodiment is used to schematically illustrate the implementation of the present invention, wherein the sequence of steps is not limited, and can be adjusted as needed. The specific steps and exemplary values are not intended to limit the scope of the present invention.
Fig. 2 illustrates an exemplary process flow of a method for adjusting the illumination intensity of a light source based on a distance-current intensity correspondence table according to some embodiments of the present invention, an iris collecting apparatus (or simply, a device) may include a first light source and a second light source, wherein the first light source may be a large-angle light source, and the second light source may be a small-angle light source. As an example, the first light source may be one or more infrared light sources, the second light source may be one or more infrared light sources, and the first light source and the second light source may be assembled into an integrated infrared lamp. The relative arrangement mode of the first light source and the second light source is flexible, for example, the first light source and the second light source can be arranged in the infrared lamp in a left-right arrangement mode or an up-down arrangement mode, or the first light source and the second light source can be arranged symmetrically or in a staggered arrangement mode; alternatively, the number of first light sources with large angles may be plural, the number of second light sources with small angles may be one, and the second light sources may be evenly arranged around the first light sources, or vice versa. The present invention is not limited to these arrangements.
The specific method can comprise the following steps:
the first step is as follows: the iris acquisition device can detect whether a person stands in front of the iris acquisition device through a distance sensor or a human eye detection algorithm module. For example, the human eye detection algorithm module can determine whether a person stands in front of the device by detecting whether a human face image exists; a distance sensor, such as an ultrasonic ranging sensor, a laser ranging sensor, or an infrared ranging sensor, may also be used to determine whether a person is present.
The second step is that: if the person is present, the distance sensor detects the distance between the user and the equipment; or the human eye detection algorithm module is used for carrying out human eye detection on the acquired image, and the distance between the user and the iris acquisition device is calculated according to the human eye detection result.
The third step: and judging whether the user is in the recognizable area (30-80 cm) or not according to the distance information.
The fourth step: and if the distance is not within the recognizable area, reminding the user to adjust the distance to the recognizable area through the prompting information of the iris acquisition device, and returning to the third step.
The fifth step: illuminating both the large angle light source and the small angle light source simultaneously.
And a sixth step: and configuring different driving currents for the large-angle light source and the small-angle light source according to the distance information so as to adjust the illumination intensity.
The seventh step: and acquiring an iris image under the adjusted illumination intensity.
In the above implementation steps, the fifth step and the sixth step may be combined into the same step, for example, when the large-angle light source and the small-angle light source are lighted, the driving current required by the direct source may be configured to obtain the predetermined illumination intensity. It can be understood that the rated current intensity of the large-angle light source and the small-angle light source can be given firstly, and then the required driving current is given, so that the light source is prevented from being damaged due to the fact that the starting current intensity of a certain power supply is too large.
The step of configuring different driving currents for the large-angle light source and the small-angle light source according to the distance information may specifically include:
step 1: and pushing the distance information to a light intensity adjusting algorithm.
Step 2: the algorithm module finds out the infrared lamp current values of two angles required under the current distance according to the distance between the user and the iris acquisition device; and sending the current value information to an infrared lamp driving board.
And step 3: and the infrared lamp driving board receives the algorithm instruction and adjusts the infrared lamp driving current.
The illumination intensities of the light sources at the two angles are overlapped to meet the set requirement, so that the illumination intensities at all distances within 30-80 cm are close to the same range value, namely the preset illumination intensity, and the iris acquisition image with uniform brightness is favorably acquired.
The relationship between the current of the large-angle light source and the current (or illumination) of the small-angle light source and the distance is shown in fig. 3, it can be understood that the illumination of the light source corresponds to the current value, and the correspondence in fig. 3 can also be called illumination-distance correspondence, which can be obtained by experiment, and the predetermined illumination intensity can be 500uW/cm2. When the fact that the distance between the users is short is detected, the infrared lamp driving board enhances the current value of the large-angle light source and weakens the current value of the small-angle light source; and when the user is detected to be far away, enhancing the current value of the small-angle light source and weakening the current value of the small-angle light source.
In some embodiments of the invention, the current intensities of the first and second light sources are calculated from the distance information. The corresponding current value can be calculated from the distance information by means of the linear relationship between the current intensity and the distance in fig. 3. For example, when the distance information is gradually increased within the identifiable region, the current intensity of the first light source is gradually decreased, and the current intensity of the second light source is gradually increased.
In some embodiments of the invention, to obtain the predetermined illumination intensity, the lighting capability of the first light source satisfies the closest position of the corresponding identifiable region and the lighting capability of the second light source satisfies the farthest position of the corresponding identifiable region. In other embodiments, first and second light sources that exceed the striking power may also be employed.
For example, when the distance information is the minimum value of 30cm of the recognizable area, the current intensity of the first light source is the maximum value, and the current intensity of the second light source is the minimum value; when the distance information is 80cm, the current intensity of the first light source is the minimum value, and the current intensity of the second light source is the maximum value. The light source is adjusted from the minimum value and the maximum value of the current intensity of the first light source and the second light source, the lighting capability and the adjustable brightness range of each power supply can be fully utilized, and the power supply capability is utilized to the maximum.
In some embodiments of the present invention, fig. 6 shows two states of the user object at the nearest and farthest distances given by the recognizable range, as shown in fig. 6, when the user stands in front of the device, the algorithm module in the device automatically performs human eye positioning, and calculates the distance between the user and the device according to the human eye positioning result. The algorithm module adjusts the current intensity of two light sources in the infrared lamp according to different distances. When the distance is the shortest, the current intensity of the large-angle power supply reaches the maximum value, and the current intensity of the small-angle power supply approaches to 0; when the distance is farthest, the current intensity of the small-angle power supply reaches the maximum value, and the current intensity of the large-angle power supply approaches to 0. As shown in fig. 7, the user object is located at the middle distance, and the current intensities of the large-angle power supply and the small-angle power supply are adjusted according to the distance, so that the iris area is uniformly lighted at a specific distance.
The iris acquisition method can acquire uniformly polished images within the identification distance range of 30-80 cm, and enhances the usability of equipment.
In some embodiments of the present invention, as shown in fig. 4, which illustrates the lighting principle of the infrared lamp, and fig. 5, which illustrates the light source arrangement in a single infrared lamp according to an embodiment of the present invention, the illumination light source of the present invention may have one or more infrared lamps, and the light sources at these two angles should be controlled separately, and the current values thereof may be changed separately or in conjunction. The illuminating light source of the invention preferentially adopts one infrared lamp to carry out multi-angle and multi-distance illumination, and compared with the traditional infrared lamp adopting various types and different divergence angles, the illuminating light source of the invention has the advantages of less lamps, good heat dissipation effect, reduced PCB (printed circuit board) layout area and greatly simplified circuit complexity.
In fig. 5, the first light source and the second light source are arranged in the left-right direction. The right light source can be a large-angle light source, and the left light source can be a small-angle light source, and can also be arranged in an opposite way or arranged up and down. The first light source and the second light source are assembled into an integrated infrared lamp, namely, two light sources with different divergence angles are arranged in a square shape in one infrared lamp and controlled by an infrared lamp driving board. The divergence angles of the first light source and the second light source may correspond to different optimal iris imaging distances, respectively.
In the embodiment, when the fact that the user distance is short is detected, the infrared lamp driving board increases the current value of the large-angle light source and decreases the current value of the small-angle light source. And when the user is detected to be far away, the current value of the small-angle light source is enhanced, and the current value of the large-angle light source is weakened. The iris of the user object can obtain infrared illumination with uniform brightness under different distances without exceeding the use range, and an iris image with uniform brightness is obtained.
According to another aspect of the present invention, there is also provided an iris collecting apparatus, as shown in fig. 8, including a light source module 140, a distance detection module 110, a control module 120, and an image collecting module 130.
In some embodiments, the light source module 140 includes a first light source 141 and a second light source 142, the divergence angles of the first light source 141 and the second light source 142 are different, and the first light source 141 and the second light source 142 may be arranged up and down, left and right, or staggered. Preferably, the first light source 141 and the second light source 142 may be assembled in one infrared lamp.
In some embodiments, the distance detection module 110 is configured to detect the distance information between the user object and the iris collecting apparatus, and the distance detection module 110 may be used in step S110 of the iris collecting method. For example, the distance detection module 110 may be a distance sensor such as an ultrasonic distance measurement sensor, a laser distance measurement sensor, or an infrared distance measurement sensor, or the image acquisition module 130 may obtain a distance value according to the human eye positioning result in combination with some image recognition algorithms.
In some embodiments, the control module 120 may be used in step S120 of the iris acquisition method. The control module 120 obtains the light intensity control parameter according to the measured distance information and adjusts the light intensity control parameters of the first and second light sources 141 and 142 to obtain a predetermined illumination intensity at the user object. In response to the above method, the control module 120 can calculate or find the required light intensity control parameter. For example, the control module 120 may include a processor, memory, and a driver. The memory may store a distance-current correspondence table, and the driver may employ an infrared lamp driving board to control the current magnitude of the first light source 141 and the second light source 142.
The image acquisition module 130 is used to acquire an iris image of a user's subject, particularly at a predetermined illumination intensity. According to the iris acquisition method and device, the beneficial effects at least comprising the following steps are obtained:
1. according to the iris acquisition method and the iris acquisition device, the technical effect that the iris image with uniform light supplement can be obtained at each target distance from far to near in the effective acquisition range is achieved by adjusting the current intensity of the light sources with different divergence angles according to the distance information.
2. The iris acquisition method and the iris acquisition device can adopt one infrared lamp light source to carry out a multi-distance illumination scheme, and compared with the traditional infrared lamp light source adopting various different models and different divergence angles, the iris acquisition method and the iris acquisition device have the advantages of small number of lamps, good heat dissipation effect, reduction of the area of a PCB (printed circuit board) layout, great simplification of circuit complexity and effective reduction of product cost.
In the description herein, reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," "an example," "a particular instance," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the various embodiments is provided to schematically illustrate the practice of the invention, and the sequence of steps is not limited and can be suitably adjusted as desired.
Those skilled in the art will appreciate that the modules or steps of the embodiments of the invention described above may be implemented in a general purpose computing device, that they may be centralized on a single computing device or distributed across a network of computing devices, and that they may alternatively be implemented in program code executable by a computing device, such that the computing device may store the program code in memory and execute the program code in the computing device, and in some cases execute the steps shown or described in a different order than that shown or described herein, or fabricate each of the modules or steps into separate integrated circuit modules, or fabricate each of the modules or steps into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. An iris collecting method of an iris collecting device is characterized by comprising a first light source and a second light source, wherein the first light source and the second light source are assembled into an integrated infrared lamp, and the divergence angle of the first light source is larger than that of the second light source;
when a user object exists in the detection area of the iris acquisition device, detecting distance information between the user object and the iris acquisition device;
in a preset identifiable area of the iris acquisition device, adjusting light intensity control parameters of the first light source and the second light source according to the distance information so as to obtain preset light intensity by superposing light of the first light source and the second light source at an imaging distance of a user object; the light intensity control parameter is current intensity, the light intensity control parameter is obtained by calculation or search according to the distance information, the current intensity of the first light source is in negative correlation with the distance information, and the current intensity of the second light source is in positive correlation with the distance information;
and acquiring an iris image of the user object under the preset illumination intensity.
2. An iris acquisition method as claimed in claim 1, wherein the first light source is at least one infrared light source, and the second light source is at least one infrared light source.
3. An iris acquisition method according to claim 1, characterized in that:
the first light source and the second light source are arranged in a left-right mode or in an up-down mode; or
The first light source and the second light source are arranged symmetrically.
4. An iris acquisition method according to claim 1, characterized in that:
the second light sources are multiple and are uniformly distributed around the first light source.
5. An iris acquisition method as claimed in claim 1, wherein the method further comprises: judging whether the user object is in the recognizable area of the iris acquisition device according to the distance information; and if the user object is not in the recognizable area, sending prompt information to remind the user object to move to the recognizable area.
6. An iris collecting method according to claim 1, wherein said iris collecting apparatus stores a correspondence table of distance information and current intensities of said first and second light sources;
the step of adjusting the light intensity control parameters of the first light source and the second light source according to the distance information comprises: and determining the current value of the first light source and the current value of the second light source corresponding to the detected distance information according to the corresponding relation table, and adjusting.
7. An iris acquisition method according to claim 1, wherein the step of adjusting the light intensity control parameters of said first light source and said second light source according to said distance information comprises:
and calculating the current intensity of the first light source and the current intensity of the second light source according to the distance information.
8. An iris acquisition method according to claim 6 or 7, wherein when the distance information is a minimum value of the recognizable region, the current intensity of the first light source is adjusted to be maximum, and the current intensity of the second light source is adjusted to be minimum;
when the distance information is the maximum value of the identifiable region, the current intensity of the first light source is adjusted to be minimum, and the current intensity of the second light source is adjusted to be maximum.
9. An iris acquisition method as claimed in claim 1, wherein the recognizable area of the iris acquisition apparatus is in the range of 30 to 80cm in front thereof.
10. An iris acquisition device is characterized by comprising a light source module, a distance detection module, a control module and an image acquisition module;
the light source module comprises a first light source and a second light source, and the divergence angle of the first light source is larger than that of the second light source;
the distance detection module is used for detecting the distance information between the user object and the iris acquisition device;
the control module adjusts light intensity control parameters of the first light source and the second light source according to the distance information so that the preset illumination intensity is obtained by overlapping illumination of the first light source and the second light source at the imaging distance of the user object;
the image acquisition module acquires an iris image under the preset illumination intensity.
11. An iris acquisition device as claimed in claim 10, wherein the first and second light sources are assembled as an integral infrared lamp.
12. An iris acquisition device as claimed in claim 11, wherein when the user's object is located in the recognizable area of the iris acquisition device and the distance from the iris acquisition device is changed from near to far, the light intensity of the first light source is gradually decreased while the light intensity of the second light source is gradually increased.
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| CN111556306B (en) * | 2019-11-21 | 2022-03-01 | 苏州思源科安信息技术有限公司 | Device and method for long-distance large-field iris optical imaging |
| JP7298459B2 (en) * | 2019-12-03 | 2023-06-27 | 富士通株式会社 | Monitoring system and monitoring method |
| CN111191643B (en) * | 2020-04-10 | 2021-09-07 | 支付宝(杭州)信息技术有限公司 | Iris image acquisition system and method |
| CN112200113B (en) * | 2020-10-21 | 2022-08-16 | 天津中科智能识别产业技术研究院有限公司 | Self-adaptive light source device |
| CN112417997A (en) * | 2020-11-03 | 2021-02-26 | 北京中科虹霸科技有限公司 | Iris image acquisition device and method |
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| CN106022275A (en) * | 2016-05-26 | 2016-10-12 | 青岛海信移动通信技术股份有限公司 | Iris recognition method and apparatus, and mobile terminal |
| CN108446648B (en) * | 2018-03-26 | 2020-09-04 | 北京上古视觉科技有限公司 | Iris acquisition system and iris recognition system |
| CN207965914U (en) * | 2018-03-26 | 2018-10-12 | 北京上古视觉科技有限公司 | A kind of iris capturing system and iris authentication system |
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