CN110598661A - Palmprint and palmar vein acquisition system - Google Patents
Palmprint and palmar vein acquisition system Download PDFInfo
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- CN110598661A CN110598661A CN201910885908.8A CN201910885908A CN110598661A CN 110598661 A CN110598661 A CN 110598661A CN 201910885908 A CN201910885908 A CN 201910885908A CN 110598661 A CN110598661 A CN 110598661A
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- 210000003462 vein Anatomy 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000001502 supplementing effect Effects 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 8
- 239000013589 supplement Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000004148 unit process Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 238000004020 luminiscence type Methods 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000000554 iris Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003813 thin hair Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
Abstract
The invention relates to a palmprint and palmar vein acquisition system, and belongs to the technical field of biological identification. The palm print and palm vein acquisition system comprises a light illumination sensing unit, an analog-digital conversion unit, a light path conversion unit, a light supplementing and light emitting unit, an LED driving unit, a CMOS sensing unit, a picture and signal processing unit, a palm placing area and an embedded processor core unit. The palm print and palm vein acquisition system adopts an embedded ARM processor, has stronger image preprocessing performance and reduces the processing requirement on a later-stage computer; the system supports a CMOS camera and can acquire dual biological characteristic information of palm prints and palm veins at one time; the system is provided with a white light and near-infrared light supplementing array and a controllable near-infrared driving circuit, and supports on-off control and light intensity control of a light supplementing light source; the system is provided with the light path conversion unit and the illuminance sensing unit to realize light adjustment, and in a word, the system has reasonable structural design and can realize quick and accurate collection of palm print and palm veins.
Description
Technical Field
The invention relates to a palmprint and palmar vein acquisition system, and belongs to the technical field of biological identification.
Background
With the development of electronic information technology, the identification application based on human body biological characteristics is more and more extensive, and the electronic control technology can be widely used for replacing the original identification application of a smart card without carrying.
In the development of the biometric identification technology, a series of technologies such as fingerprints, voice prints, human faces, irises, finger veins, palm prints, palm veins and the like appear, the technical characteristics are different, and the identification precision is also greatly different. At present, the iris recognition and palm vein recognition in the accepted biometric identification technology have the highest precision, and the biometric identification technology is required to be a living body, so that the biometric identification method has the application prospect of thick and thin hairs.
The existing acquisition system can only acquire the palm vein information or the palm print information independently, the palm vein information and the palm print information can be acquired synchronously, even if the palm vein information and the palm print information can be acquired, a double lens is used, and the size is larger. In addition, the existing acquisition system usually adopts a fixed-focus camera, and the palm of a user is required to be fixed in front of the camera and keep a standard distance (the focal length of the camera), otherwise, a clear image cannot be acquired. In addition, the existing acquisition system usually uses a non-standard interface to communicate with a back-end computer, even if a USB interface is adopted, a specific driving program needs to be installed aiming at different operating systems, the use is not convenient enough, and the universality is greatly reduced.
The invention discloses a palmprint and palmar vein acquisition system which adopts a single-lens design and is compatible with acquisition of two biological characteristic information of palmprints and palmar veins. The USB communication interface is adopted externally, special driving is not needed, multiple platforms (Windows, Linux and MAC) are compatible and supported, and the USB communication interface has wide universality. Through the acquired images, a high-quality data source is provided for matching identification of the back end based on the computer platform.
Disclosure of Invention
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a palm print palm pulse collection system, includes illuminance sensing unit, analog-to-digital conversion unit, light path transform unit, light filling luminescence unit, LED drive unit, CMOS induction element, picture and signal processing unit, palm and places district and embedded processor core unit, its characterized in that:
the CMOS sensing unit adopts the acquisition and input of left and right images of a CMOS camera, the camera is a variable-focus camera and can automatically focus a photographed palm, the camera is connected to the image and signal processing unit through a DVP (digital video processing) interface, and the image and signal processing unit processes the image acquired by the camera and then transmits the processed image to the embedded processor core unit;
the illuminance detection unit adopts a photocell as an illuminance detection sensor, and converts an illuminance signal of ambient light into a digital signal through an analog-to-digital conversion unit after signal conditioning and then transmits the digital signal to the embedded processor core unit;
the embedded processor core unit can automatically adjust the intensity of light supplement of a white light LED lamp or a near-infrared LED lamp in the light supplement and light emitting unit through the LED driving unit according to the measured ambient light intensity, the LED driving unit is connected with the embedded processor core unit through an I2C interface, the I2C interface sends the brightness parameters of the LED, and the driving unit adjusts the driving current of the LED in a PWM (pulse width modulation) mode and drives the white light LED lamp or the near-infrared LED lamp in the light supplement and light emitting unit to be lightened; if the palm print information is shot, the white light LED lamp emits light, and the light emitting intensity is determined according to the ambient light intensity; if the palm vein distribution is shot, the white light LED lamp is turned off, the near-infrared LED lamp is turned on, and the brightness of the near-infrared LED lamp is adjusted according to the ambient light intensity;
the light supplementing and light emitting unit collects palm veins of a palm in the palm placement area through the light path conversion unit, the light path conversion unit adopts a Fresnel lens type design, converts a point type annular LED light source into a circular surface light source, and uniformly irradiates the middle of the palm to obtain an optimal image;
and the embedded processor core unit preprocesses the shot palm print image and the shot palm vein image and sends the processed palm print image and the processed palm vein image to a back-end computer through a USB3.0 interface to carry out feature extraction and matching identification.
The image and signal processing unit is arranged outside or inside the embedded processor core unit.
Preferably, the white light LED lamps and the near-infrared LED lamps in the light supplementing and light emitting unit are distributed annularly, and the white light LED lamps and the near-infrared LED lamps are distributed at intervals.
The USB3.0 interface can provide 5V/900mA direct current power supply.
The preferred acquisition system adopts a low-power-consumption embedded ARM platform, and accords with the industrial grade; 1GB memory and 4GB super storage are built in the memory.
The wavelength of the near-infrared LED lamp is preferably selected to be 850 nm.
The invention designs a palmprint and palmar vein acquisition system, which has the following advantages: 1) the embedded ARM processor is adopted, so that the system has stronger image preprocessing performance, and the requirement on the processing of a later computer is reduced; 2) the system supports the CMOS camera and can acquire dual biological characteristic information of palm print and palm vein at one time; 3) the camera is a zoom camera, and the acquisition does not need to be carried out at a fixed distance and only needs to be carried out within a certain range; 4) the light source module is provided with a white light and near infrared light supplementing array and a controllable near infrared driving circuit, and supports on-off control and light intensity control of a light supplementing light source; 5) the near-infrared array light source can be uniformly diffused by the light path conversion unit, so that the quality of the collected image is ensured; 6) the illuminance sensing unit is used for testing the illuminance of the ambient light so as to adjust the optimal light supplement intensity; 7) and the standard external interface does not need additional driving, and the preprocessed image can be conveniently transmitted to a rear-end computer for feature extraction or matching identification.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a palmprint and palmar vein collection system according to the present invention;
FIG. 2 is a distribution diagram of LED lamps in the fill-in light-emitting unit according to the present invention;
wherein 1, a white light LED lamp; 2. near-infrared LED lamp.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In a first embodiment, please refer to fig. 1-2, a palm print and palm vein collection system includes a light illumination sensing unit, an analog-to-digital conversion unit, a light path conversion unit, a light supplementing and emitting unit, an LED driving unit, a CMOS sensing unit, a picture and signal processing unit, a palm placing area, and an embedded processor core unit, and is characterized in that:
the CMOS sensing unit adopts the acquisition and input of left and right images of a CMOS camera, the camera is a variable-focus camera and can automatically focus a photographed palm, the camera is connected to the image and signal processing unit through a DVP (digital video processing) interface, and the image and signal processing unit processes the image acquired by the camera and then transmits the processed image to the embedded processor core unit;
the illuminance detection unit adopts a photocell as an illuminance detection sensor, and converts an illuminance signal of ambient light into a digital signal through an analog-to-digital conversion unit after signal conditioning and then transmits the digital signal to the embedded processor core unit;
the embedded processor core unit can automatically adjust the intensity of light supplement of a white light LED lamp or a near-infrared LED lamp in the light supplement and light emitting unit through the LED driving unit according to the measured ambient light intensity, the LED driving unit is connected with the embedded processor core unit through an I2C interface, the I2C interface sends the brightness parameters of the LED, and the driving unit adjusts the driving current of the LED in a PWM (pulse width modulation) mode and drives the white light LED lamp 1 or the near-infrared LED lamp 2 in the light supplement and light emitting unit to be lightened; if the palm print information is shot, the white light LED lamp 1 emits light, and the light emitting intensity is determined according to the ambient light intensity; if the palm pulse distribution is shot, the white light LED lamp 1 is turned off, the near-infrared LED lamp 2 is turned on, and the brightness of the near-infrared LED lamp 2 is adjusted according to the ambient light intensity;
the light supplementing and light emitting unit collects palm veins of a palm in the palm placement area through the light path conversion unit, the light path conversion unit adopts a Fresnel lens type design, converts a point type annular LED light source into a circular surface light source, and uniformly irradiates the middle of the palm to obtain an optimal image;
the embedded processor core unit is used for preprocessing the shot palm print image and palm vein image and then sending the processed images to a back-end computer through a USB3.0 interface for feature extraction and matching identification, the image and signal processing unit is arranged outside the embedded processor core unit, a white light LED lamp 1 and a near infrared LED lamp 2 in the light supplementing and light emitting unit are distributed annularly, the white light LED lamp 1 and the near infrared LED lamp 2 are distributed at intervals, the USB3.0 interface can provide a direct current power supply of 5V/900mA, and the acquisition system adopts a low-power consumption embedded ARM platform and accords with the industrial level; 1GB memory and 4GB super large storage are arranged in the near infrared LED lamp 2, and the wavelength of the near infrared LED lamp is 850 nm.
The invention designs a palm print and palm vein acquisition system, when the palm print and palm vein acquisition system starts to work, a rear-end computer sends an acquisition instruction to prompt a user to place a palm in a palm placing area in front of a camera, an LED driving unit of the acquisition system firstly drives a white light LED lamp 1 in a light supplementing and emitting unit to emit light, and the white light LED lamp and the light path conversion unit enable a white light area light source which is uniformly distributed to be presented in front of a CMOS camera. At the moment, a CMOS camera in the CMOS sensing unit is started to prepare for collecting palm print information of a user, and the picture and signal processing unit can automatically adjust the focal length of the CMOS camera according to a shot image, so that the optimal image information is obtained. When the collection of the palm print information is finished, the white light LED lamp can be automatically turned off, the near-infrared LED lamp is turned on, and the uniformly distributed near-infrared area light source is obtained through the light path transformation unit, so that the palm vein image of the user is obtained, and the collection process is finished. All operations are completed in a calculation and embedded core module, the structural design of the palm print and palm vein acquisition system is reasonable within milliseconds, and palm print and palm vein can be acquired quickly and accurately.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. The utility model provides a palm print palm pulse collection system, includes illuminance sensing unit, analog-to-digital conversion unit, light path transform unit, light filling luminescence unit, LED drive unit, CMOS induction element, picture and signal processing unit, palm and places district and embedded processor core unit, its characterized in that: the CMOS sensing unit adopts the acquisition and input of left and right images of a CMOS camera, the camera is a variable-focus camera and can automatically focus a photographed palm, the camera is connected to the image and signal processing unit through a DVP (digital video processing) interface, and the image and signal processing unit processes the image acquired by the camera and then transmits the processed image to the embedded processor core unit; the illuminance detection unit adopts a photocell as an illuminance detection sensor, and converts an illuminance signal of ambient light into a digital signal through an analog-to-digital conversion unit after signal conditioning and then transmits the digital signal to the embedded processor core unit; the embedded processor core unit can automatically adjust the intensity of light supplement of a white light LED lamp or a near-infrared LED lamp in the light supplement and light emitting unit through the LED driving unit according to the measured ambient light intensity, the LED driving unit is connected with the embedded processor core unit through an I2C interface, the I2C interface sends the brightness parameters of the LED, and the driving unit adjusts the driving current of the LED in a PWM (pulse width modulation) mode and drives the white light LED lamp (1) or the near-infrared LED lamp (2) in the light supplement and light emitting unit to be lightened; if the palm print information is shot, the white light LED lamp (1) emits light, and the light emitting intensity is determined according to the ambient light intensity; if the palm pulse distribution is shot, the white light LED lamp (1) is turned off, the near-infrared LED lamp (2) is turned on, and the brightness of the near-infrared LED lamp (2) is adjusted according to the ambient light intensity; the light supplementing and light emitting unit collects palm veins of a palm in the palm placement area through the light path conversion unit, the light path conversion unit adopts a Fresnel lens type design, converts a point type annular LED light source into a circular surface light source, and uniformly irradiates the middle of the palm to obtain an optimal image; and the embedded processor core unit preprocesses the shot palm print image and the shot palm vein image and sends the processed palm print image and the processed palm vein image to a back-end computer through a USB3.0 interface to carry out feature extraction and matching identification.
2. The palmprint and palmar vein collection system of claim 1, wherein: the image and signal processing unit is arranged outside or inside the embedded processor core unit.
3. The palmprint and palmar vein collection system of claim 1, wherein: white light LED lamps (1) and near-infrared LED lamps (2) in the light filling and light emitting unit are distributed annularly, and the white light LED lamps (1) and the near-infrared LED lamps (2) are distributed at intervals.
4. The palmprint and palmar vein collection system of claim 1, wherein: the USB3.0 interface can provide 5V/900mA direct current power supply.
5. The palmprint and palmar vein collection system of claim 1, wherein: the acquisition system adopts a low-power-consumption embedded ARM platform and accords with the industrial grade; 1GB memory and 4GB super storage are built in the memory.
6. The palmprint and palmar vein collection system of claim 3, wherein: the wavelength of the near-infrared LED lamp (2) is 850 nm.
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| CN201910885908.8A CN110598661A (en) | 2019-09-19 | 2019-09-19 | Palmprint and palmar vein acquisition system |
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| CN201910885908.8A CN110598661A (en) | 2019-09-19 | 2019-09-19 | Palmprint and palmar vein acquisition system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116828316A (en) * | 2023-08-29 | 2023-09-29 | 北京圣点云信息技术有限公司 | Vein image self-adaptive exposure method |
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