CN112651382A - Focusing data calibration system and iris image acquisition system - Google Patents
Focusing data calibration system and iris image acquisition system Download PDFInfo
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- G—PHYSICS
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- 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
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/18—Focusing aids
- G03B13/20—Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
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Abstract
The invention provides a focusing data calibration system and an iris image acquisition system, wherein the focusing data calibration system comprises: the object distance measuring device is used for measuring the distance between a lens of the camera and the acquisition object marker to obtain the object distance of the camera; the constant current source circuit module is used for receiving the controllable constant voltage and outputting a constant current to control the action of the voice coil motor; and the processing module is used for obtaining focusing data of the camera focused by the voice coil motor according to focusing data points corresponding to the plurality of object distances. By the scheme, the image acquisition equipment can be miniaturized, and meanwhile, a larger image acquisition range is ensured.
Description
Technical Field
The invention relates to the technical field of iris imaging, in particular to a focusing data calibration system and an iris image acquisition system.
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 acquisition distance range. However, the optical imaging system of the conventional remote iris acquisition device generally adopts a zoom system, and a motor drives a lens to move so as to change the imaging distance, so that the size is large and the manufacturing cost is high.
In order to use the iris acquisition equipment which is convenient and miniaturized, the focus fixing system is intelligently applied, and the volume of the equipment can be reduced by driving the lens by using a voice coil motor (VCM for short) with small volume. However, the VCM driving current has an upper limit, and the lens adjustable range is small, so that the iris acquisition range is limited.
Disclosure of Invention
In view of this, embodiments of the present invention provide a focus data calibration system and an iris image capturing system for a voice coil motor focus camera, so as to ensure a larger image capturing range while miniaturizing an image capturing device.
In order to achieve the purpose, the invention is realized by adopting the following scheme:
according to an aspect of the embodiments of the present invention, there is provided a focus data calibration system for a voice coil motor focus camera, including:
the object distance measuring device is used for measuring the distance between a lens of the camera and the acquisition object marker to obtain the object distance of the camera;
the constant current source circuit module is used for receiving a controllable constant voltage, amplifying a signal of the controllable constant voltage and outputting a constant current to control a voice coil motor to act so that the voice coil motor drives a lens of the camera to move a corresponding distance between the acquisition object marker and an image sensor of the camera;
the processing module is used for acquiring the image of the acquisition object marker after the camera moves for a corresponding distance through the image sensor and determining whether the image of the acquisition object marker is clear or not; under the condition that the imaging of the acquisition object marker is unclear, re-acquiring the re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to a lens of the camera or adjusting the controllable constant voltage by the image sensor; and under the condition that the current imaging of the collected object marker is clear, corresponding the current object distance of the camera with the current constant current to obtain a focusing data point, and obtaining the focusing data of the camera focused by using the voice coil motor according to the focusing data points corresponding to a plurality of object distances.
In some embodiments, the system for calibrating focusing data of a voice coil motor focusing camera further comprises: a position adjustment device;
and the position adjusting device is used for bearing the acquisition object marker and enabling the acquisition object marker to move on the optical axis of the camera.
The position adjusting device is a slide rail; and/or the acquisition object marker is a backlight plate or a mark card; and/or the object distance measuring device is a scale.
In some embodiments, the system for calibrating focusing data of a voice coil motor focusing camera further comprises:
the constant voltage source module is used for outputting the controllable constant voltage to the constant current source circuit module; the constant voltage source module is an analog-to-digital conversion chip.
In some embodiments, the controllable constant voltage is an analog voltage, and the constant current source circuit module includes an analog power amplifying circuit.
In some embodiments, the constant current source circuit module is a two-stage analog power amplifying circuit;
the two-stage analog power amplifying circuit includes: the circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, a PNP triode, a pull-up resistor, an NPN triode and a power resistor; the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the controllable constant voltage receiving end and the ground; the base electrode of the PNP triode is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the emitter electrode of the PNP triode is connected with the base electrode of the NPN triode, and the collector electrode of the PNP triode is grounded; one end of the pull-up resistor is connected with a working voltage input end, and the other end of the pull-up resistor is connected between the emitter of the PNP triode and the base of the NPN triode; the voice coil motor is used as a load resistor and is connected between the collector of the NPN triode and the working voltage access end; one end of the power resistor is connected with the emitter of the NPN triode, and the other end of the power resistor is grounded.
In some embodiments, the first and second divider resistors each have a resistance of less than one kiloohm; the resistance value of the pull-up resistor can enable the emitter of the PNP triode to be biased downwards; the NPN triode is a power triode.
In some embodiments, the processing module is further configured to receive an application scene temperature, and output a temperature compensation instruction to the constant current source circuit module according to a difference between the application scene temperature and a set standard temperature; and/or the presence of a gas in the gas,
the constant current source circuit module is further configured to read a sampling voltage from one end of the power resistor close to the emitter of the NPN triode, and perform closed-loop control on the collector current of the NPN triode according to the read sampling voltage.
In some embodiments, the processing module is further configured to find a constant current section corresponding to each object distance, where the constant current section enables the collected object marker to be clear, and obtain a middle value of the constant current section, where the middle value corresponds to the corresponding object distance, to obtain a focus data point; or finding an object distance section which is corresponding to the constant current value and can enable the collected object marker to be clear, taking the middle value of the object distance section, and corresponding to the corresponding constant current value to obtain a focusing data point.
According to another aspect of an embodiment of the present invention, there is provided an iris image acquisition system including:
the focusing data calibration system of the focusing camera is used for acquiring the focusing data of the voice coil motor focusing camera; the focusing data comprises a corresponding relation between the object distance of the voice coil motor focusing camera and the constant current required by the voice coil motor;
the user ranging module is used for acquiring the distance between a user and the lens of the iris image acquisition module to obtain an object distance;
the processing module is used for searching the corresponding relation between the object distance of the voice coil motor focusing camera and the constant current required by the voice coil motor according to the obtained object distance to obtain the constant current required by the voice coil motor;
the iris image acquisition module comprises a voice coil motor focusing camera and is used for driving a voice coil motor in the voice coil motor focusing camera to drive the voice coil motor to move a corresponding distance according to the obtained constant current required by the voice coil motor, and then the voice coil motor focusing camera is used for acquiring iris images of users.
The focusing data calibration system of the voice coil motor focusing camera and the iris image acquisition system can ensure a larger image acquisition range while miniaturizing image acquisition equipment, the iris image acquisition system simultaneously adopts focusing data obtained by the focusing data calibration system of the voice coil motor focusing camera, the object distance-VCM driving constant current corresponding relation is obtained by searching for focusing, the focusing driving constant current can be judged by only utilizing the distance, a clear image is directly acquired after focusing is finished, focusing is not required to be adjusted for multiple times for judgment, and the processing mode is simpler compared with multiple times of focusing.
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 structural diagram of a focus data calibration system of a voice coil motor focus camera according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a focusing principle of the focusing data calibration system of the voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the characteristic of a power amplifying transistor of a constant current source circuit module in a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a first-stage analog power amplifying circuit of a constant current source circuit module in a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a two-stage analog power amplifying circuit of a constant current source circuit module in a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 6 is a block diagram of a focus data calibration system of a voice coil motor focus camera in accordance with one embodiment of the present invention;
FIG. 7 is a flowchart illustrating the calibration of the focusing data of the focusing camera of the voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating the calibration of focus data for a focus camera of a voice coil motor focus camera according to another embodiment of the present invention;
FIG. 9 is a graph illustrating a focus data curve of a voice coil motor focus camera according to an embodiment of the present invention;
fig. 10 is a block diagram of an iris image acquisition system according to another 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.
It should be noted in advance that the features described in the following embodiments or examples or mentioned therein can be combined with or replace the features in other embodiments or examples in the same or similar manner to form a possible implementation. In addition, the term "comprises/comprising" as used herein refers to the presence of a feature, element, step or component, but does not preclude the presence or addition of one or more other features, elements, steps or components.
For iris acquisition equipment to use convenient and miniaturized, the inventor considers using Voice Coil Motor (VCM) with small volume to drive the lens to reduce the volume of the equipment, however, the volume of a driving IC of the traditional VCM is too small and the structure is complex, the cost of the driving circuit is higher, the function is single, most ICs can only realize fixed current control, and the limit problem of the upper limit of the driving current exists. Under the current upper limit problem, the focusing data of the voice coil motor focusing camera has a limited range, and is still limited by the depth of field, and the acquisition range is smaller. Meanwhile, the existing focusing mode has certain limitation on the focusing problem during iris acquisition. If a constant voltage source with higher power is used, the current sensitive device fails and malfunctions due to long-term use although the constant voltage source has lower cost compared with the constant current source.
In contrast, the invention provides a focusing data calibration system of a voice coil motor focusing camera, a VCM is adopted to drive a camera lens to reduce the volume of equipment, a VCM driving circuit is improved to increase the upper limit of current, and a constant current source design is adopted to prevent the current sensitive device from failing and failing.
Fig. 1 is a schematic structural diagram of a focus data calibration system of a voice coil motor focus camera according to an embodiment of the present invention, and referring to fig. 1, the focus data calibration system of a voice coil motor focus camera according to an embodiment of the present invention may include: an object distance measuring device 110, a constant current source circuit module 120 and a processing module 130.
And the object distance measuring device 110 is used for measuring the distance between the lens of the camera and the acquisition object marker to obtain the object distance of the camera. The camera lens can be a commonly-used M12 lens, the FNo is 2.4 lens, the depth of field of the lens can reach 5-10 cm, fault-tolerant focusing errors can be achieved well, and certain anti-interference capacity is achieved on focusing curve errors. The collection object marker may be a backlight panel or a badge. The object distance measuring device may be a scale.
For example, the distance between the lens of the measurement camera and the object marker may specifically be a distance between the backlight plate or the target and a plane (perpendicular to the optical axis) where the optical center of the lens of the iris image capturing module is located, as shown in fig. 2, the distance may be an object distance fArticle (A)。
And the constant current source circuit module 120 is configured to receive a controllable constant voltage, amplify a signal of the controllable constant voltage, and output a constant current to control the voice coil motor to move, so that the voice coil motor drives the lens of the camera to move a corresponding distance between the acquisition object marker and the image sensor of the camera.
The controllable constant voltage may be obtained from an external constant voltage source module. In other embodiments, the focus data calibration system shown in fig. 1 may further include a constant voltage source module, wherein the constant voltage source module may be configured to output the controllable constant voltage to the constant current source circuit module 120. The constant voltage source module may be an analog-to-digital conversion chip, or may be other interfaces capable of outputting a controllable constant voltage, for example, a DAC (digital-to-analog conversion) output interface of a CPU.
The controllable constant voltage may be an analog voltage. The constant current source circuit module 120 may perform signal amplification on the controllable constant voltage through power amplification. Specifically, the constant current source circuit block may include a power amplification circuit, for example, the constant current source circuit block may include a two-stage analog power amplification circuit.
The power amplifying circuit can be realized based on the output characteristic of the triode, as shown in fig. 3, as can be seen from the output curve of the triode, when the triode works in the amplifying region, the change of the Ic current is controlled by the change of the Ib current, i.e. Δ Ic and Δ Ib are in direct proportion, and a certain linear relationship exists between the Δ Ic and Δ Ib. Then only Ib needs to be controlled to generate a constant current, Ic (or Ie, since Ie + Ic) is constant, and since the change of Uce voltage does not affect the change of Ic, the voltage of the driven device can be flexibly adjusted.
Illustratively, the signal amplification may be performed by a one-stage analog power amplification circuit. As shown in fig. 4, the one-stage analog power amplifier circuit obtains a triode conditioning circuit and an equation from the amplification characteristics of the triode, where Vdac is the DAC circuit output value, Vb is the triode base voltage, Ve is the triode emitter voltage, Ib is the triode base current, R1, R2, R3 are divider resistors, Vcc is the system supply voltage, Ie is the emitter electrode, Veb is the triode inter-emitter voltage, and β is the triode amplification factor.
Further, to ensure that a sufficiently large power load can be driven, a two-stage analog power amplifier circuit may be employed. As shown in fig. 5, parameter Ib 'is the base current of NPN transistor, Ic' is the collector current of the transistor, Ie 'is the emitter current of the transistor, β' is the amplification factor of the transistor, Vb 'e' is the base emitter voltage of the transistor, R4 is the power sampling resistor, and Rload is the voice coil motor. The two-stage analog power amplifying circuit may include: the circuit comprises a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a PNP triode, a pull-up resistor R3, an NPN triode and a power resistor R4; wherein the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series between the controllable constant voltage receiving end and the ground; the base electrode of the PNP triode is connected between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the emitter electrode of the PNP triode is connected with the base electrode of the NPN triode, and the collector electrode of the PNP triode is grounded; one end of the pull-up resistor R3 is connected with a working voltage input end, and the other end of the pull-up resistor R3 is connected between the emitter of the PNP triode and the base of the NPN triode; the voice coil motor is used as a load resistor Rload and is connected between the collector of the NPN triode and the working voltage access end; one end of the power resistor R4 is connected with the emitter of the NPN triode, and the other end is grounded.
In the case of using the two-stage analog power amplifying circuit, the constant current of the constant current source is Ic', and the obtained circuit element relationship equation and the constant current source equation may be:
in an embodiment, the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor may be less than one kilo-ohm. The emitter of the PNP triode can be downwards biased by the resistance value of the pull-up resistor. The PNP triode in the two-stage power analog amplification circuit can be various triodes capable of realizing control signal conditioning, such as a conventional silicon tube; the NPN triode in the two-stage power analog amplification circuit can select a power triode, so that the high collector current passing property and high voltage resistance can be ensured.
Further, the constant current source circuit module 120 may be further configured to read a sampling voltage from one end of the power resistor close to the emitter of the NPN transistor, and perform closed-loop control on the collector current of the NPN transistor according to the read sampling voltage. The specific mode is that a DAC interface using an analog-to-digital conversion chip (DAC) or a CPU is connected from the front end of the power resistor R4, a sampling voltage value is read, the precision of the output current is judged through the difference value between the ratio of the sampling voltage to the power resistor R4 and Ic', and then the difference value is fed back to a control end processing module to judge whether the output controllable constant voltage needs to be adjusted.
The processing module 130 is configured to acquire, by using the image sensor, an image of the acquisition object marker after the camera moves a corresponding distance, and determine whether the image of the acquisition object marker is clear. Specifically, the imaging definition judgment can be determined by a method similar to MTF (Modulation Transfer Function) calculation, or can be manually analyzed by capturing a short-interval (distance interval or current interval) image to eliminate the influence of depth of field, and generally, the intermediate value of a clear image sequence is taken as a focusing definition point; under the condition that the image of the acquisition object marker is unclear, firstly adjusting the position of the acquisition object marker relative to a lens of the camera, then adjusting the controllable constant voltage, then re-imaging the marker by the camera, and finally acquiring a new image by the image sensor until the current image of the acquisition object marker is clear. And on the premise of clear imaging of the collected object marker, corresponding the current object distance of the camera with the current constant current to obtain a focusing data point. And continuously adjusting the object distance within the object distance range of the required focusing data, repeating the focusing data point acquisition process, and obtaining the focusing data by using the focusing camera according to a plurality of focusing data points within the corresponding object distance range.
In the case of adjusting the object distance by the device, the focusing data calibration system according to the embodiment of the present invention may further include a position adjusting device. For example, the position adjustment device is a slide rail. The slide rail is used for bearing the acquisition object marker, and can also ensure that the acquisition object marker can move on the optical axis of the camera. In addition, the camera can also be arranged on the sliding rail, so that the object distance of the acquisition object marker can be freely adjusted within a certain range under the condition that the acquisition object marker does not deviate from the optical axis of the camera.
In one embodiment, referring to FIG. 6, the calibration system includes a backlight or target 140, a slide 150, a scale 160, a camera and VCM drive 170, and a processing module 130. Referring to FIG. 2, in an imaging system of an embodiment, the focal length of the camera lens is f, and the image distance is the corresponding distance f between the focusing camera lens and the processing module image sensorImageAnd the object distance is the distance f between the lens of the measuring camera and the acquisition object markerArticle (A)The three have relational expression
In the case of a constant focal length f, as can be seen from FIG. 2, the image distance fImageGenerally, it is necessary to be greater than the focal length f, the object distance fArticle (A)The size of the iris image cannot be increased infinitely, namely, clear images cannot be acquired within a certain range, and therefore clear images can be acquired only when the object marker is acquired within a certain iris acquisition area.
Wherein, according to the imaging formula
Can be used for different object distances f under the condition that the focal length f is fixedArticle (A)Then, the corresponding image distance f can be calculatedImageThereby continuously changing the object distance fArticle (A)Can obtain a series ofThe lens can have an initial position according to the corresponding relation of the object distance and the image distance, the distance difference of each image distance relative to the image distance of the initial position can be adjusted by driving the lens through the VCM, and the VCM can be moved by the distance difference by setting a current.
In some embodiments, the processing module 130 may be a PC, and is configured to find a constant current section corresponding to each object distance, which enables the collected object identifier to be clear, and obtain a middle value of the constant current section, which corresponds to the corresponding object distance, to obtain a focusing data point, as shown in fig. 7, where a specific focusing process is as follows:
firstly, determining an initial position by a scale, and initializing system driving;
secondly, setting the constant current to be 0, and acquiring the image of the acquisition object marker after the camera moves a corresponding distance through the image sensor;
thirdly, the processing module 130 determines whether the image of the acquisition object marker is clear;
fourthly, if the image is clear, increasing constant current so that the voice coil motor drives the lens of the camera to move a corresponding distance between the acquisition object marker and the image sensor of the camera;
fifthly, adjusting the position of the acquisition object marker, and determining whether the imaging of the acquisition object marker is clear by the processing module 130;
sixthly, if clear, recording the current object distance and the constant current, and if not clear, returning to the fifth step;
seventhly, calibrating the object distance range, and judging whether calibration is finished;
eighthly, finding a constant current section which corresponds to each object distance and can enable the collected object marker to be clear, taking a middle value of the constant current section, corresponding to the corresponding object distance, and obtaining a focusing data point, otherwise, returning to the fourth step;
and ninthly, obtaining focusing data by using the focusing camera according to focusing data points corresponding to a plurality of object distances after the calibration is finished.
In another example, the processing module 130 may be further configured to find an object distance section corresponding to a constant current value and enabling the collected object identifier to be clear, and obtain a middle value of the object distance section and obtain a focusing data point corresponding to the corresponding constant current value, as shown in fig. 8, where a specific focusing process is as follows:
firstly, determining an initial position by a scale, and initializing system driving;
secondly, setting the constant current to be 0, and acquiring the image of the acquisition object marker after the camera moves a corresponding distance through the image sensor;
thirdly, the processing module 130 determines whether the image of the acquisition object marker is clear;
fourthly, if the object distance is clear, adjusting the position of the marker of the acquisition object, and changing the size of the object distance;
fifthly, adjusting the magnitude of the constant current, driving the lens of the camera to move a corresponding distance between the collected object marker and the image sensor of the camera by using the voice coil motor, and determining whether the image of the collected object marker is clear by using the processing module 130;
sixthly, if clear, recording the current object distance and the constant current, and if not clear, returning to the fifth step;
seventhly, calibrating the object distance range, and judging whether calibration is finished;
eighthly, finding an object distance section which corresponds to a constant current value and can enable the collected object marker to be clear, taking a middle value of the object distance section, corresponding to the corresponding constant current value, and obtaining a focusing data point, otherwise, returning to the fourth step;
and ninthly, obtaining focusing data by using the focusing camera according to focusing data points corresponding to a plurality of object distances after the calibration is finished.
This example differs from the previous one mainly in the variables of regulation, i.e. object distance and constant current in the calibration stage. Meanwhile, by designing the constant current source circuit module 120, the range of the object distance which can be imaged in the calibration link is enlarged. Through the above focusing calibration process, the corresponding relationship between the object distance of the focusing camera and the required constant current as shown in fig. 9 can be obtained, where curve 1 is a curve calculated theoretically, and curve 2 is an actually measured curve. As can be seen by comparing the curve 1 and the curve 2, the actual measurement curve is more consistent with the linear characteristic of the theoretical calculation curve, and the upper limit of the current is higher.
In some embodiments, the "voltage" or "current" control curve may change at different temperatures, and for example, when the VCM is driven, the output voltage of the control terminal is a controllable constant value at a specific object distance, and the imaging is clear, but if there is temperature drift, the focus drift may be caused, and the imaging is not clear. It is generally recommended to avoid this situation by taking temperature compensation in the application scenario. Specifically, the processing module 130 is used to receive the application scene temperature, calibrate the corresponding temperature-current curve according to the different application scene temperatures, and finally output an instruction to the constant current source circuit module 120 to adjust the constant current at the different application scene temperatures, so that the focusing is clear.
In addition, an embodiment of the present invention further provides an iris image collecting system, as shown in fig. 10, the iris image collecting system may include: the user ranging module 190, the calibration system 200 for focusing data, the iris image acquisition module 210 and the processing module 220 are described in the above embodiments.
And the user ranging module 190 is used for acquiring the distance between the user and the lens of the iris image acquisition module to obtain the object distance. Specifically, the user ranging module 190 is configured to collect a face depth image, and obtain a distance between a user corresponding to a face in the newly collected face image and the iris image collecting device according to the eye position information and the face depth image. The user ranging module 190 may be a structured light ranging module, a TOF (time of flight) ranging module, or the like. The distance between the user and the iris image capturing system may specifically be a distance between an object plane (perpendicular to the optical axis) where the user is located and a plane (perpendicular to the optical axis) where the optical center of the lens of the iris image capturing module is located, as shown in fig. 2, the distance may be an object distance fArticle (A)。
A processing module 220 for processing the face image according to the face in the re-collected face imageAnd judging whether the user is located in the iris acquisition region or not according to the distance between the corresponding user and the iris image acquisition device, and determining position adjustment parameters according to the distance between the user and the iris image acquisition device under the condition that the user is located in the iris acquisition region. The processing module 130 may be implemented by a CPU, a microprocessor, or the like. Referring to fig. 2, in the imaging system, a focal length f and an image distance f of the iris lensImageAnd object distance fArticle (A)Having a relational expression
In the case of a constant focal length f, as can be seen from FIG. 2, the image distance fImageGenerally, it is necessary to be greater than the focal length f, the object distance fArticle (A)The iris image acquisition device cannot be infinitely enlarged, namely, a clear iris image cannot be acquired within a certain range beyond which the iris image acquisition device is required, so that a user is required to be in a certain iris acquisition area to be able to acquire the clear iris image.
In other embodiments, the processing module may be further configured to output a prompt for prompting the user to move to the iris acquisition region if the user is not within the iris acquisition region. For example, the user may be prompted to move towards or away from the device via a display screen, or may be prompted by a flashing light or a sound, or may be prompted in multiple ways simultaneously.
The iris image acquisition module 210 drives the VCM in the focusing camera to drive the lens in the focusing camera to move according to the obtained constant current required by the VCM. Firstly, when the user is located in the iris image capturing area, the processing module 220 searches for focusing data between the user and the lens in the iris image capturing module, which is established by the calibration system 200 for focusing data, according to the distance between the user and the iris image capturing device, and obtains VCM current corresponding to the distance between the user and the iris image capturing device. The focusing data comprises the corresponding relation between the object distance of the voice coil motor focusing camera and the constant current required by the voice coil motor. At this time, the iris image acquisition module 210 drives the VCM at a VCM current corresponding to the distance between the user and the iris image acquisition device to drive the camera lens to move a corresponding distance relative to the image sensor, i.e. to adjust the image distance of the iris image acquisition module, so that the iris image acquisition module can acquire a clear iris image of the user. Wherein the VCM may also act as a lens mount in some other embodiments.
In a specific embodiment, when the distance between the user and the iris image capturing device is detected, the camera lens focusing data pre-established by the calibration system 200 for focusing data may be searched according to the distance, the current distance is closest to the distance in the corresponding relationship, and the constant driving current of the corresponding voice coil motor is found, and the voice coil motor drives the iris lens to move to the position corresponding to the closest distance (i.e., the image distance) by using the constant driving current, so that a clear iris image may be formed on the image sensor.
In another embodiment, the processing module may be further configured to, when the user is located in the iris acquisition region, partition and determine an iris acquisition region segment to which a distance between the user and the iris image acquisition device belongs according to a set iris acquisition region segment, obtain the iris acquisition region segment to which the distance between the user and the iris image acquisition device belongs according to the distance between the user and the iris image acquisition module 210, find the camera lens focusing data pre-established by the calibration system 200 for focusing data, and then the VCM drives the camera lens in the iris image acquisition module 210 to move relative to the image sensor so as to acquire the focusing data of a sharp iris image, so as to obtain a constant driving current corresponding to the iris acquisition region segment to which the distance between the user and the iris image acquisition device belongs; the iris image capturing module 210 may further be configured to drive the camera lens under the corresponding constant driving current, and the lens moves a corresponding distance with respect to the image sensor to adjust an image distance of the iris image capturing module, so that the iris image capturing module can capture a clear iris image of the user through adjustment.
This embodiment differs from the previous embodiment mainly in that the correspondence established is a segment versus constant drive current relationship. Since the relationship between the object distance and the image distance is continuous as known from the imaging formula, many data points are required if the corresponding relationship is established according to the data points. In the embodiment, the acquisition area is divided into a series of sections, and the image definition of each object distance of the sections corresponding to the same image distance is not greatly different, so that the image distance corresponding to one object distance in the sections can be found out and used as the image distance corresponding to all the object distances in the sections, and therefore, the sections corresponding to the distances in the application process can be conveniently and quickly found out, and the corresponding constant driving current can be quickly found out.
In the above embodiments, the user ranging module 190 performs eye positioning to obtain the eye position, and then the user ranging module 190 measures the distance between the user and the device, and adjusts the VCM to drive the camera lens to move a corresponding distance relative to the image sensor according to the camera lens focusing data pre-established by the calibration system 200 of the focusing data, so as to ensure that a clear iris image can be acquired, and the quality of iris acquisition is ensured. The constant current source replaces the traditional IC drive, so that the upper limit of the constant drive current is improved, and the range of focusing data and the iris acquisition range are expanded.
In summary, in the focus data calibration system of the voice coil motor focus camera according to the embodiment of the present invention, the object distance of the camera is obtained by measuring the distance between the lens of the camera and the collected object marker; the voice coil motor is used for receiving the constant current output by the constant current source circuit module and driving the lens of the camera to move corresponding distance between the acquisition object marker and the image sensor of the camera; the processing module acquires the image of the acquisition object marker after the camera moves a corresponding distance through the image sensor, and determines whether the image of the acquisition object marker is clear or not; under the condition that the imaging of the acquisition object marker is unclear, re-acquiring the re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to a lens of the camera or adjusting the controllable constant voltage by the image sensor; and under the condition that the current imaging of the collected object marker is clear, corresponding the current object distance of the camera with the current constant current to obtain a focusing data point, and obtaining the focusing data of the camera focused by using the voice coil motor according to the focusing data points corresponding to a plurality of object distances. The VCM is used for driving the lens, so that the volume of the equipment can be reduced. Through the design of the constant current source circuit module, compared with the existing voice coil motor driving IC chip, the peak value of the driving current is greatly improved, the moving range of the collected object marker is expanded, the focusing data point sample range is larger, and the upper limit of the focusing data is improved.
In the iris image acquisition system according to another embodiment of the present invention, the distance between the user and the lens of the iris image acquisition module is acquired by the user ranging module 190 to obtain the object distance; and finally, driving the voice coil motor in the voice coil motor focusing camera to drive the voice coil motor to focus a lens in the camera to move for a corresponding distance according to the obtained constant current required by the voice coil motor, and then acquiring the iris image of the user by the iris image acquisition module through the voice coil motor focusing camera. Through the system design, the iris image acquisition system ensures a larger image acquisition range while miniaturizing the image acquisition equipment, and meanwhile, the voice coil motor is adopted to calibrate the focusing data obtained by the system for focusing the focusing data of the camera, the object distance-VCM driving constant current corresponding relation is obtained by searching for focusing, the focusing driving constant current can be judged by only utilizing the distance, a clear image is directly acquired after the focusing is finished, the judgment is carried out without adjusting the focusing for many times, and the processing mode is simpler compared with that of focusing for many times.
In the description herein, reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," "an example," "a particular example," 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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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 (11)
1. A system for calibrating focusing data of a voice coil motor focusing camera is characterized by comprising:
the object distance measuring device is used for measuring the distance between a lens of the camera and the acquisition object marker to obtain the object distance of the camera;
the constant current source circuit module is used for receiving a controllable constant voltage, amplifying a signal of the controllable constant voltage and outputting a constant current to control a voice coil motor to act so that the voice coil motor drives a lens of the camera to move a corresponding distance between the acquisition object marker and an image sensor of the camera;
the processing module is used for acquiring the image of the acquisition object marker after the camera moves for a corresponding distance through the image sensor and determining whether the image of the acquisition object marker is clear or not; under the condition that the imaging of the acquisition object marker is unclear, re-acquiring the re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to a lens of the camera or adjusting the controllable constant voltage by the image sensor; and under the condition that the current imaging of the collected object marker is clear, corresponding the current object distance of the camera with the current constant current to obtain a focusing data point, and obtaining the focusing data of the camera focused by using the voice coil motor according to the focusing data points corresponding to a plurality of object distances.
2. The focus data calibration system for a voice coil motor focus camera as claimed in claim 1, further comprising:
and the position adjusting device is used for bearing the acquisition object marker and enabling the acquisition object marker to move on the optical axis of the camera.
3. The focus data calibration system for a voice coil motor focus camera of claim 2,
the position adjusting device is a slide rail; and/or the acquisition object marker is a backlight plate or a mark card; and/or the object distance measuring device is a scale.
4. The focus data calibration system for a voice coil motor focus camera as claimed in claim 1, further comprising: the constant voltage source module is used for outputting the controllable constant voltage to the constant current source circuit module; the constant voltage source module is an analog-to-digital conversion chip.
5. The system for calibrating focus data of a voice coil motor focus camera as claimed in claim 1, wherein said controllable constant voltage is an analog voltage, and said constant current source circuit module comprises an analog power amplifying circuit.
6. The system for calibrating focusing data of a voice coil motor focusing camera according to claim 5, wherein the constant current source circuit module is a two-stage analog power amplifying circuit.
7. The system for calibrating focus data for a voice coil motor focus camera as claimed in claim 6, wherein said two-stage analog power amplification circuit comprises: the circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, a PNP triode, a pull-up resistor, an NPN triode and a power resistor; the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the controllable constant voltage receiving end and the ground; the base electrode of the PNP triode is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the emitter electrode of the PNP triode is connected with the base electrode of the NPN triode, and the collector electrode of the PNP triode is grounded; one end of the pull-up resistor is connected with a working voltage input end, and the other end of the pull-up resistor is connected between the emitter of the PNP triode and the base of the NPN triode; the voice coil motor is used as a load resistor and is connected between the collector of the NPN triode and the working voltage access end; one end of the power resistor is connected with the emitter of the NPN triode, and the other end of the power resistor is grounded.
8. The system for calibrating focusing data of a voice coil motor focusing camera according to claim 7, wherein the resistances of the first voltage-dividing resistor and the second voltage-dividing resistor are both less than one kilo-ohm; the resistance value of the pull-up resistor can enable the emitter of the PNP triode to be biased downwards; the NPN triode is a power triode.
9. The focus data calibration system for a voice coil motor focus camera of claim 7,
the processing module is also used for receiving the application scene temperature and outputting a temperature compensation instruction to the constant current source circuit module according to the difference value between the application scene temperature and the set standard temperature; and/or the presence of a gas in the gas,
the constant current source circuit module is further configured to read a sampling voltage from one end of the power resistor close to the emitter of the NPN triode, and perform closed-loop control on the collector current of the NPN triode according to the read sampling voltage.
10. The focus data calibration system for a voice coil motor focus camera of claim 1,
the processing module is further configured to find a constant current section corresponding to each object distance, where the constant current section enables the collected object marker to be clear, and obtain a middle value of the constant current section, where the middle value corresponds to the corresponding object distance, so as to obtain a focusing data point; or finding an object distance section which is corresponding to the constant current value and can enable the collected object marker to be clear, taking the middle value of the object distance section, and corresponding to the corresponding constant current value to obtain a focusing data point.
11. An iris image acquisition system, comprising:
the system for calibrating focusing data of a voice coil motor focusing camera as claimed in any one of claims 1 to 10, for obtaining the focusing data of the voice coil motor focusing camera; the focusing data comprises a corresponding relation between the object distance of the voice coil motor focusing camera and the constant current required by the voice coil motor;
the user ranging module is used for acquiring the distance between a user and the lens of the iris image acquisition module to obtain an object distance;
the processing module is used for searching the corresponding relation between the object distance of the voice coil motor focusing camera and the constant current required by the voice coil motor according to the obtained object distance to obtain the constant current required by the voice coil motor;
the iris image acquisition module comprises a voice coil motor focusing camera and is used for driving a voice coil motor in the voice coil motor focusing camera to drive the voice coil motor to move a corresponding distance according to the obtained constant current required by the voice coil motor, and then the voice coil motor focusing camera is used for acquiring iris images of users.
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