CN112651382B - 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
- 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
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- 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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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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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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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30196—Human being; Person
- G06T2207/30201—Face
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/30244—Camera pose
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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 the lens of the camera and the object identifier to obtain the object distance of the camera; the constant current source circuit module is used for receiving the controllable constant voltage and outputting constant current to control the voice coil motor to act; and the processing module is used for obtaining focusing data of the camera focused by the voice coil motor according to the focusing data points corresponding to the object distances. Through the scheme, the image acquisition equipment can be miniaturized and a larger image acquisition range can be 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 a depth of field range of 10cm, 15cm or even wider, and a foundation is laid for expanding the acquisition distance range. However, the optical imaging system of the traditional remote iris acquisition device generally adopts a zooming system, and a motor drives a lens to move so as to change the imaging distance, so that the volume is large and the manufacturing cost is high.
In order to use convenient and miniaturized iris acquisition equipment, a fixed focus system is intelligently applied, and a voice coil motor (VCM for short) with small volume is used for driving a lens, so that the equipment volume can be reduced. However, the VCM driving current has an upper limit, and the lens adjustable range is small, resulting in a limited iris acquisition range.
Disclosure of Invention
In view of this, the embodiment of the invention provides a focusing data calibration system and an iris image acquisition system of a voice coil motor focusing camera, so as to ensure a larger image acquisition range while miniaturizing an image acquisition device.
In order to achieve the above purpose, the invention is realized by adopting the following scheme:
according to an aspect of an embodiment of the present invention, there is provided a focusing data calibration system of a voice coil motor focusing camera, including:
the object distance measuring device is used for measuring the distance between the lens of the camera and the object identifier to obtain the object distance of the camera;
the constant current source circuit module is used for receiving the controllable constant voltage, amplifying the controllable constant voltage, outputting constant current and controlling the voice coil motor to act so that the voice coil motor drives the lens of the camera to move by a corresponding distance between the acquisition object identifier and the image sensor of the camera;
the processing module is used for acquiring imaging of the acquisition object identifier by the camera after moving a corresponding distance through the image sensor and determining whether the imaging of the acquisition object identifier is clear or not; re-acquiring re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to the lens of the camera or adjusting the controllable constant voltage under the condition that imaging of the acquisition object marker is unclear; and under the condition that the current imaging of the acquired object identifier is clear, the current object distance of the camera is corresponding to the current constant current to obtain a focusing data point, and focusing data of the camera focused by the voice coil motor are obtained according to the focusing data points corresponding to the object distances.
In some embodiments, the focusing data calibration system of the voice coil motor focusing camera further comprises: a position adjusting device;
and the position adjusting device is used for bearing the acquisition object identifier and enabling the acquisition object identifier to move on the optical axis of the camera.
The position adjusting device is a sliding rail; and/or the acquisition object identifier is a backlight plate or a label card; and/or the object distance measuring device is a scale.
In some embodiments, the focusing data calibration system of the 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 amplification circuit;
the two-stage analog power amplifying circuit includes: the power amplifier 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 the 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 electrode of the NPN triode; the voice coil motor is connected between the collector electrode of the NPN triode and the working voltage access end as a load resistor; 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 voltage dividing resistor and the second voltage dividing resistor each have a resistance value 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 value between the application scene temperature and a set standard temperature; and/or the number of the groups of groups,
the constant current source circuit module is also used for reading sampling voltage from one end of the power resistor, which is close to the emitter of the NPN triode, and performing closed-loop control on 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 and capable of making the acquired object identifier clear, and take an intermediate value of the constant current section, and correspond to the corresponding object distance to obtain a focusing data point; or finding an object distance section corresponding to a constant current value and capable of enabling the acquired object identifier to be clear, and taking the intermediate value of the object distance section to correspond to the corresponding constant current value so as 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 focusing data of the voice coil motor focusing camera; 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;
the user ranging module is used for acquiring the distance between a user and the lens of the iris image acquisition module to obtain the 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;
and the iris image acquisition module comprises the voice coil motor focusing camera and is used for driving the voice coil motor in the voice coil motor focusing camera to drive the lens in the voice coil motor focusing camera to move by a corresponding distance according to the obtained constant current required by the voice coil motor, and then acquiring iris images of a user by using the voice coil motor focusing camera.
The focusing data calibration system and the iris image acquisition system of the voice coil motor focusing camera can ensure a larger image acquisition range while miniaturizing the 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 through searching in focusing, the size of the focusing driving constant current can be judged only by utilizing the distance, clear images are directly obtained after focusing is finished, the judgment is carried out without adjusting focusing for many times, and the processing mode is simpler compared with the repeated focusing.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a focusing principle of a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the power amplifying triode characteristics of the constant current source circuit module in the focusing data calibration system of the 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 amplifier 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 amplifier 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 for a voice coil motor focus camera in accordance with an embodiment of the present invention;
FIG. 7 is a flow chart of calibration of focusing data of a focusing camera of a voice coil motor focusing camera according to an embodiment of the invention;
FIG. 8 is a flow chart of calibration of focusing data of a focusing camera of a voice coil motor focusing camera according to another embodiment of the present invention;
FIG. 9 is a diagram illustrating a focusing data curve of a voice coil motor focusing 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 invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
It is to be noted in advance that the description of the embodiments or examples below or the features mentioned therein may be combined with or replace features in other embodiments or examples in the same or similar way to form possible implementations. Furthermore, the term "comprises/comprising" as used herein means the presence of a feature, element, step or component, but does not exclude the presence of one or more other features, elements, steps or components.
In order to facilitate and miniaturize the iris acquisition device, the inventor considers using a Voice Coil Motor (VCM) with a small volume to drive the lens to reduce the volume of the device, but the driving IC of the conventional VCM has a small volume and a complex structure, the driving circuit has a high cost and a single function, and most ICs can only realize fixed current control and have a limitation problem of an upper limit of driving current. Under the problem of current upper limit limitation, the voice coil motor focuses the focusing data of the camera to have a limited range, still is limited by the depth of field, and has a smaller acquisition range. Meanwhile, the existing focusing mode has certain limitation on focusing problems during iris acquisition. If a constant voltage source with larger power is used, the constant voltage source has lower cost than the constant current source, but the constant current source can cause the failure and the fault of a current sensitive device for a long time.
In this regard, the invention provides a focusing data calibration system of a voice coil motor focusing camera, which adopts a VCM to drive a camera lens to reduce the volume of equipment, improves the upper limit of current by improving a VCM driving circuit, and prevents failure and faults of a current sensitive device by adopting a constant current source design.
Fig. 1 is a schematic structural diagram of a focusing data calibration system of a voice coil motor focusing camera according to an embodiment of the invention, referring to fig. 1, the focusing data calibration system of the voice coil motor focusing camera according to the embodiment of the 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 identifier to obtain the object distance of the camera. The camera lens can be a common lens with M12 and FNo of 2.4, the depth of field of the lens can reach 5-10 cm, the lens can well tolerate focusing errors, and the lens has certain anti-interference capability on focusing curve errors. The collection object identifier may be a backlight board or a label card. The object distance measuring device may be a scale.
The distance between the lens of the measuring camera and the object marker may be specifically the distance between the backlight plate or the tag card and the plane (perpendicular to the optical axis) of the optical center of the lens of the iris image acquisition module, as shown in fig. 2, which may be the object distance f Article (B) 。
The constant current source circuit module 120 is configured to receive a controllable constant voltage, amplify the controllable constant voltage, and output 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 collection object identifier and an image sensor of the camera.
The controllable constant voltage can be obtained from an external constant voltage source module. In other embodiments, the focusing 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 the CPU.
The controllable constant voltage may be an analog voltage. The constant current source circuit module 120 may amplify a controllable constant voltage by power amplification. Specifically, the constant current source circuit module may include a power amplifying circuit, for example, the constant current source circuit module may include a two-stage analog power amplifying 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 Ic current is controlled by the change of Ib current, namely, Δic and Δib are in direct proportion, and a certain linear relation exists between the Δic and Δib. Then, only Ib needs to be controlled to generate a constant current, ic (or Ie because ie=ib+ic) is constant, and meanwhile, since the change of the Uce voltage does not affect the change of Ic, the voltage of the driven device can be flexibly adjusted.
Signal amplification may be performed by a primary analog power amplification circuit, for example. As shown in fig. 4, the primary analog power amplifier circuit obtains a triode conditioning circuit and an equation from the amplifying characteristic of a triode, wherein Vdac is a DAC circuit output value, vb is a triode base voltage, ve is a triode emitter voltage, ib is a triode base current, R1, R2, R3 are voltage dividing resistors, vcc is a system power supply voltage, ie is an emitter electrode, veb is a triode emitter base inter-voltage, β is a triode amplifying coefficient, and through the power amplifier circuit, the input voltage Vdac can be amplified, and the current Ie is output.
Further, to ensure that a sufficiently high power load can be driven, a two-stage analog power amplifier circuit may be employed. As shown in fig. 5, the parameter Ib 'is the base current of the NPN transistor, ic' is the collector current of the transistor, ie 'is the emitter current of the transistor, β' is the transistor amplification factor, 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 amplification circuit may include: the power amplifier 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; 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 the 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 electrode of the NPN triode; the voice coil motor is used as a load resistor Rload and is connected between the collector electrode 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 of the power resistor R is grounded.
Under the condition of adopting the two-stage analog power amplifying circuit, the constant current source constant current is Ic', and the obtained circuit element relation equation and constant current source equation can be:
in a specific embodiment, the resistance values of the first voltage dividing resistor and the second voltage dividing resistor may be less than one kiloohm. The resistance of the pull-up resistor can enable the emitter of the PNP triode to be biased downwards. The PNP triode in the secondary power analog amplifying circuit can be various triodes capable of realizing control signal conditioning, such as a conventional silicon tube; the NPN triode in the secondary power analog amplifying circuit can select a power triode, so that larger collector current trafficability 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 an end of the power resistor near 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 an analog-to-digital conversion chip (DAC) or a DAC interface of a CPU is connected from the front end of a power resistor R4, a sampling voltage value is read, and the accuracy of output current is judged through the difference value between the ratio of the sampling voltage and the power resistor R4 and Ic', so that whether the output controllable constant voltage needs to be adjusted is fed back to a processing module at a control end.
And the processing module 130 is used for acquiring the imaging of the acquisition object identifier by the camera after moving a corresponding distance through the image sensor and determining whether the imaging of the acquisition object identifier is clear or not. Specifically, the imaging definition judgment can be determined by a method similar to MTF (Modulation Transfer Function ) calculation, or can be performed by intercepting a short-interval (distance interval or current interval) image, so as to eliminate the influence of depth of field, and generally take the intermediate value of a clear image sequence as a focusing definition point; under the condition that imaging of the acquisition object identifier is unclear, firstly adjusting the position of the acquisition object identifier relative to a lens of the camera, then adjusting the controllable constant voltage, then re-imaging the identifier by the camera, and finally acquiring new imaging by the image sensor until the current imaging of the acquisition object identifier is clear. And on the premise that the imaging of the acquired object identifier is clear, the current object distance of the camera is corresponding to the current constant current, and a focusing data point is obtained. And continuously adjusting the object distance in 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 in the corresponding object distance range.
In the case of adjusting the object distance by the device, the focusing data calibration system of the embodiment of the invention can further comprise a position adjusting device. For example, the position adjusting device is a slide rail. The sliding rail is used for bearing the acquisition object identifier and can also ensure that the acquisition object identifier 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 identifier can be freely adjusted within a certain range under the condition of not deviating from the optical axis of the camera.
In one embodiment, referring to FIG. 6, the calibration system includes a backlight or label card 140, a slide rail 150, a scale 160, a camera and VCM driver 170, and a processing module 130. Referring to fig. 2, in the imaging system of the embodiment, the focal length of the camera lens is f, and the image distance is f, which is the distance between the focusing camera lens and the processing module image sensor Image forming apparatus And the object distance is the distance f between the lens of the measuring camera and the acquisition object identifier Article (B) Three have a relationIn the case of a certain focal length f, it can be seen from fig. 2 that the image distance f Image forming apparatus Generally needs to be greater than the focal length f, then the object distance f Article (B) The image cannot be infinitely enlarged, that is, a clear image cannot be acquired within a certain range beyond which the object identifier is required to be acquired within a certain iris acquisition region.
Wherein, according to the imaging formulaCan be used for different object distances f under the condition of fixed focal length f Article (B) The corresponding image distance f can be calculated Image forming apparatus Thereby by continuously changing the object distance f Article (B) Can obtain a series of corresponding relations between object distance and image distance, and the lens can haveThe distance difference between each image distance and the image distance of the initial position can be adjusted by the VCM driving the lens, and the distance difference can be moved by setting a current for the VCM.
In some embodiments, the processing module 130 may be a PC, configured to find a constant current section corresponding to each object distance and capable of making the collected object identifier clear, and take an intermediate value of the constant current section, and correspond to the corresponding object distance to obtain a focusing data point, as shown in fig. 7, and the specific focusing process is as follows:
the first step, the scale determines the initial position, and the system drive is initialized;
setting a constant current to 0, and acquiring imaging of the acquisition object identifier by the camera after moving a corresponding distance through the image sensor;
third, the processing module 130 determines whether the imaging of the acquisition object identifier is clear;
step four, if clear, increasing constant current so that the voice coil motor drives a lens of the camera to move a corresponding distance between the acquisition object identifier and an image sensor of the camera;
fifth, adjusting the position of the collected object identifier, and determining whether the imaging of the collected object identifier is clear by the processing module 130;
sixth, if the object distance is clear, recording the current object distance and constant current, and if the object distance is not clear, returning to the fifth step;
seventh, in the object distance range, judging whether the calibration is finished or not;
eighth, if the object distance is over, finding a constant current section corresponding to each object distance and capable of enabling the acquired object identifier to be clear, taking the intermediate value of the constant current section, and corresponding to the corresponding object distance to obtain a focusing data point, otherwise, returning to the fourth step;
and a ninth step, after calibration, obtaining focusing data by using the focusing camera according to focusing data points corresponding to the object distances.
In another example, the processing module 130 may be further configured to find an object distance section corresponding to a constant current value and capable of making the acquired object identifier clear, and take an intermediate value of the object distance section, and correspond to the corresponding constant current value to obtain a focusing data point, as shown in fig. 8, where a specific focusing process is as follows:
the first step, the scale determines the initial position, and the system drive is initialized;
setting a constant current to 0, and acquiring imaging of the acquisition object identifier by the camera after moving a corresponding distance through the image sensor;
third, the processing module 130 determines whether the imaging of the acquisition object identifier is clear;
fourth, if clear, adjust and gather the object marker position, change the object distance size;
fifthly, regulating the constant current, driving a lens of the camera to move a corresponding distance between the acquisition object identifier and an image sensor of the camera by a voice coil motor, and determining whether imaging of the acquisition object identifier is clear or not by a processing module 130;
sixth, if the object distance is clear, recording the current object distance and constant current, and if the object distance is not clear, returning to the fifth step;
seventh, in the object distance range, judging whether the calibration is finished or not;
eighth, if the process is finished, finding an object distance section corresponding to a constant current value and capable of enabling the acquired object identifier to be clear, taking the intermediate value of the object distance section, and corresponding to the corresponding constant current value to obtain a focusing data point, otherwise, returning to the fourth step;
and a ninth step, after calibration, obtaining focusing data by using the focusing camera according to focusing data points corresponding to the object distances.
This example differs from the previous example mainly in the difference in the variables that are adjusted, i.e. the object distance and the constant current in the calibration link. Meanwhile, through the design of 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 and the required constant current of the focusing camera as shown in fig. 9 can be obtained, wherein the curve 1 is a theoretically calculated curve, and the curve 2 is an actually measured curve. As can be seen by comparing the curve 1 with the curve 2, the linear characteristics of the measured curve and the theoretical calculation curve are more consistent, and the upper limit of the current is higher.
In some embodiments, the "voltage" or "current" control curves will change at different temperatures, for example, when VCM is driving, and the output voltage of the control terminal is a controllable constant value at a specific object distance, so that imaging is clear, but if there is a temperature drift, focus drift will be caused, and imaging is unclear. It is generally suggested to take temperature compensation to circumvent this situation in the application scenario. Specifically, the processing module 130 is firstly utilized to receive the application scene temperature, and the corresponding temperature-current curve is calibrated according to the different application scene temperatures, and finally an instruction is output to the constant current source circuit module 120, so that the constant current at the different application scene temperatures is regulated, and the focusing is clear.
In addition, the embodiment of the invention also provides an iris image acquisition system, as shown in fig. 10, the iris image acquisition 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, according to the human eye position information and the face depth image, a distance between a user corresponding to a face in the re-collected face image and an iris image collection device. 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 acquisition system may specifically be the distance between the object plane (perpendicular to the optical axis) of the user and the plane (perpendicular to the optical axis) of the optical center of the lens of the iris image acquisition module, as shown in fig. 2, the distance may be the object distance f Article (B) 。
A processing module 220 for acquiring iris images according to the user corresponding to the face in the re-acquired face imageWhether the user is located in the iris acquisition area or not is judged, and under the condition that the user is located in the iris acquisition area, position adjustment parameters are determined according to the distance between the user and the iris image acquisition device. The processing module 130 may be implemented with a CPU, microprocessor, or the like. Referring to fig. 2, in the imaging system, the focal length f and the image distance f of the iris lens Image forming apparatus Object distance f Article (B) Has a relation typeIn the case of a certain focal length f, it can be seen from fig. 2 that the image distance f Image forming apparatus Generally needs to be greater than the focal length f, then the object distance f Article (B) The iris image cannot be infinitely enlarged, that is, a clear iris image cannot be acquired within a certain range beyond which the user is required to acquire the clear iris image within a certain iris acquisition region.
In other embodiments, the processing module may be further configured to output prompt information 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 toward or away from the device by a display screen, or may be prompted by flashing a light or sounding, or may be prompted in a variety of ways simultaneously.
The iris image acquisition module 210 then 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. First, when the user is located in the iris acquisition area, the processing module 220 searches for focusing data between the user and the lens in the iris image acquisition module, which is established by the calibration system 200 for focusing data, according to the distance between the user and the iris image acquisition device, so as to obtain the VCM current corresponding to the distance between the user and the iris image acquisition device. The focusing data includes a correspondence between an object distance of the voice coil motor focusing camera and a constant current required by the voice coil motor. At this time, the iris image acquisition module 210 drives the VCM to drive the camera lens to move a corresponding distance relative to the image sensor under the VCM current corresponding to the distance between the user and the iris image acquisition device, that is, the iris image acquisition module is used for adjusting the image distance of the iris image acquisition module, so that the iris image acquisition module can acquire the clear iris image of the user. The VCM may also serve as a lens mount in some other embodiments.
In a specific embodiment, when the distance between the user and the iris image acquisition device is detected, the camera lens focusing data pre-established by the calibration system 200 of focusing data can be searched according to the distance, the current distance is closest to the distance in the corresponding relationship, 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 can be formed on the image sensor.
In another embodiment, the processing module may be further configured to divide and determine, according to a set iris acquisition area section, an iris acquisition area section to which a distance between the user and the iris image acquisition device belongs, obtain, according to a distance between the user and the iris image acquisition module 210, the iris acquisition area section to which the distance belongs, search for the camera lens focusing data pre-established by the focusing data calibration system 200, and then drive the VCM to move the camera lens in the iris image acquisition module 210 relative to the image sensor thereof so as to acquire focusing data of a clear iris image, thereby obtaining a constant driving current corresponding to the iris acquisition area section to which the distance between the user and the iris image acquisition device belongs; the iris image acquisition module 210 may be further configured to drive the camera lens at the corresponding constant driving current, and the lens moves a corresponding distance relative to the image sensor to adjust an image distance of the iris image acquisition module, so that the iris image acquisition module can acquire a clear iris image of the user through adjustment.
This embodiment differs from the previous embodiment mainly in that the correspondence established is that of the segments with constant drive current. Since the relationship between the object distance and the image distance is continuous according to the imaging formula, if the corresponding relationship is established according to the data points, a plurality of data points are needed. In this embodiment, the collection 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 does not have great difference, 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 object distances in the sections, thereby being convenient for quickly finding out the sections corresponding to the distances in the application process, and further being capable of quickly finding out the corresponding constant driving current.
In the above embodiments, the user ranging module 190 is used to perform human eye positioning to obtain the human eye position, so that the user ranging module 190 is used to measure the distance between the user and the device, and the camera lens focusing data pre-established by the focusing data calibration system 200 is used to adjust the VCM to drive the camera lens to move a corresponding distance relative to the image sensor, so that a clear iris image can be collected, and the quality of iris collection is ensured. The constant current source replaces the traditional IC drive, the upper limit of the constant drive current is improved, and the range of focusing data and the iris acquisition range are enlarged.
In summary, in the focusing data calibration system of the voice coil motor focusing camera according to the embodiment of the invention, the object distance of the camera is obtained by measuring the distance between the lens of the camera and the collected object identifier; the voice coil motor is used for receiving constant current output by the constant current source circuit module and driving a lens of the camera to move a corresponding distance between the acquisition object identifier and an image sensor of the camera; the processing module acquires imaging of the acquisition object identifier after the camera moves by a corresponding distance through the image sensor, and determines whether the imaging of the acquisition object identifier is clear or not; re-acquiring re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to the lens of the camera or adjusting the controllable constant voltage under the condition that imaging of the acquisition object marker is unclear; and under the condition that the current imaging of the acquired object identifier is clear, the current object distance of the camera is corresponding to the current constant current to obtain a focusing data point, and focusing data of the camera focused by the voice coil motor are obtained according to the focusing data points corresponding to the 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 traditional voice coil motor drive IC chip, the peak value of the drive current is greatly improved, the moving range of the object marker is enlarged, the sample range of the focusing data point is larger, and the upper limit of the focusing data is improved.
In the iris image acquisition system of 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, so as to obtain the object distance; and the processing module searches 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, and finally drives the voice coil motor in the voice coil motor focusing camera to drive the lens in the voice coil motor focusing camera to move by a corresponding distance according to the obtained constant current required by the voice coil motor, and the iris image acquisition module acquires iris images of a user by using 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, simultaneously adopts focusing data obtained by a focusing data calibration system of a voice coil motor focusing camera, focuses to obtain an object distance-VCM driving constant current corresponding relation through searching, only uses the distance to judge the size of the focusing driving constant current, directly obtains a clear image after focusing is finished, does not need to adjust focusing for multiple times for judgment, and has a simpler processing mode compared with multiple focusing.
In the description of the present specification, reference to the terms "one embodiment," "one 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 order of steps involved in the embodiments is illustrative of the practice of the invention, and is not limited and may be suitably modified as desired.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A focus data calibration system for a voice coil motor focus camera, comprising:
the object distance measuring device is used for measuring the distance between the lens of the camera and the object identifier to obtain the object distance of the camera;
the constant current source circuit module is used for receiving the controllable constant voltage, amplifying the controllable constant voltage, outputting constant current and controlling the voice coil motor to act so that the voice coil motor drives the lens of the camera to move by a corresponding distance between the acquisition object identifier and the image sensor of the camera; the constant current source circuit module is a two-stage analog power amplifying circuit, and comprises: the power amplifier 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 the 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 electrode of the NPN triode; the voice coil motor is connected between the collector electrode of the NPN triode and the working voltage access end as a load resistor; 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;
the processing module is used for acquiring imaging of the acquisition object identifier by the camera after moving a corresponding distance through the image sensor and determining whether the imaging of the acquisition object identifier is clear or not; re-acquiring re-imaging of the marker by the camera after adjusting the position of the acquisition object marker relative to the lens of the camera or adjusting the controllable constant voltage under the condition that imaging of the acquisition object marker is unclear; and under the condition that the current imaging of the acquired object identifier is clear, the current object distance of the camera is corresponding to the current constant current to obtain a focusing data point, and focusing data of the camera focused by the voice coil motor are obtained according to the focusing data points corresponding to the object distances.
2. A voice coil motor focus camera focus data calibration system as defined in claim 1, further comprising:
and the position adjusting device is used for bearing the acquisition object identifier and enabling the acquisition object identifier to move on the optical axis of the camera.
3. A focusing data calibration system for a voice coil motor focusing camera as recited in claim 2,
the position adjusting device is a sliding rail; and/or the acquisition object identifier is a backlight plate or a label card; and/or the object distance measuring device is a scale.
4. A voice coil motor focus camera focus data calibration system as defined 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. A voice coil motor focus camera focus data calibration system as defined in claim 1, wherein said controllable constant voltage is an analog voltage.
6. The system for calibrating focusing data of a voice coil motor focusing camera according to claim 1, wherein the resistance values of the first voltage dividing resistor and the second voltage dividing resistor are smaller 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.
7. A focus data calibration system for a voice coil motor focus camera as defined in claim 1,
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 number of the groups of groups,
the constant current source circuit module is also used for reading sampling voltage from one end of the power resistor, which is close to the emitter of the NPN triode, and performing closed-loop control on collector current of the NPN triode according to the read sampling voltage.
8. A focus data calibration system for a voice coil motor focus camera as defined in claim 1,
the processing module is further used for finding a constant current section corresponding to each object distance and capable of enabling the acquired object identifier to be clear, taking the intermediate value of the constant current section, and corresponding to the corresponding object distance to obtain a focusing data point; or finding an object distance section corresponding to a constant current value and capable of enabling the acquired object identifier to be clear, and taking the intermediate value of the object distance section to correspond to the corresponding constant current value so as to obtain a focusing data point.
9. An iris image acquisition system, comprising:
a voice coil motor focus camera's focus data calibration system as defined in any one of claims 1 to 8, for obtaining focus data of the voice coil motor focus camera; 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;
the user ranging module is used for acquiring the distance between a user and the lens of the iris image acquisition module to obtain the 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;
and the iris image acquisition module comprises the voice coil motor focusing camera and is used for driving the voice coil motor in the voice coil motor focusing camera to drive the lens in the voice coil motor focusing camera to move by a corresponding distance according to the obtained constant current required by the voice coil motor, and then acquiring iris images of a user by using the voice coil motor focusing camera.
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| CN113838150B (en) * | 2021-08-30 | 2024-03-19 | 上海大学 | Moving target three-dimensional track tracking method based on electrohydraulic adjustable focus lens |
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