RU227816U1 - DEVICE FOR RECOGNITION OF PALM VEIN PATTERN - Google Patents

Abstract

The utility model relates to the field of recognizing biometric templates related to a person in images or video data, in particular to identifying a person by an image of his palm. A device for recognizing a palm vein pattern, comprising a housing in which a palm lighting unit, a palm image receiving unit, a palm image processing unit, an Ethernet cable connector, a power supply unit are installed, characterized in that the Ethernet cable connector comprises a cable retainer, the device is configured to receive power via the Ethernet cable, the power supply unit is connected to the Ethernet cable connector and comprises two current drivers for powering the lighting unit; IR LEDs are divided into groups, each group is configured to receive power from its own current driver; the power supply unit comprises protection against increased voltage and against voltage surges; the current drivers are configured to provide pulse current stabilization. The technical result consists in increasing the reliability of the palm vein recognition device.

Description

The field of technology to which the utility model relates

The utility model relates to the field of recognizing biometric templates related to a person in images or video data, in particular, to identifying a person based on an image of his palm.

State of the art

A device for contactless identification using a palm print is known (US11151234B2, published 2021-10-19). The known solution discloses a computing platform for matching a digital representation of a palm with a palm template. The platform includes a logic unit that provides an image representation in a viewfinder, including a stream of images and/or a signal that is located substantially in front of the user to help the user align the palm in a position in the field of view of the camera; capturing a set of images using the camera; processing the set of images to determine a set of identifying features of the palm; and comparing the set of identified features with registered palm prints to identify the palm.

The known solution includes an OLED screen to prompt for hand positioning on the device; a speaker to prompt for correcting the palm position; and a lighting unit containing multiple multispectral LEDs.

However, this solution does not disclose details of how to supply power to the LEDs.

A device for visual intercom of a smart building based on finger vein identification (WO2016019680A1) is known as a prototype. The known solution comprises a power supply, a power supply driver circuit, a single chip, a vein collection circuit, an SD card, an SD card interface circuit, an LCD display circuit, an LCD display screen, an audio output circuit, a speaker, an RS-232/485 communication circuit, and an access controller. The power supply is connected to the single chip via a power supply driver circuit; the vein collection circuit is connected to the single chip; the SD card is connected to the single chip via the SD card interface circuit; the single chip transmits visual intercom information to the LCD screen via the LCD display circuit; the access controller is connected to the RS-232/385 conversion circuit to control door opening and closing. The known solution provides accurate user identification to ensure security in residential premises.

However, this solution does not disclose the details of the implementation of the LED power supply.

Disclosure of a utility model

In one aspect of the utility model, a device for recognizing the pattern of veins in the palm of the hand is disclosed, comprising:

a housing in which a palm illumination unit, a palm image receiving unit, a palm image processing unit, an Ethernet cable connector, a power supply unit are installed,

characterized by the fact that

the Ethernet cable connector contains a cable lock,

the device is designed with the ability to receive power via an Ethernet cable,

The power supply is connected to the Ethernet cable connector and contains two current drivers to power the lighting unit.

In additional aspects, it is disclosed that the IR LEDs are divided into groups, each group is configured to receive power from its own current driver; each LED of the group is connected to the current driver in series; the power supply contains protection against increased voltage; the current drivers are configured to provide pulse current stabilization.

The main objective of the utility model is to increase the reliability of the recognition device.

The essence of the solution is that power is supplied to multiple IR LEDs via a twisted-pair information cable (PoE (Power over Ethernet) technology), and means are used to ensure the stability of the voltage supplied to the IR LEDs.

The technical result achieved by the solution consists in increasing the reliability of the device for recognizing palm veins.

Brief description of the drawings

Fig. 1 shows a top view of the claimed device.

Implementation of a utility model

The claimed device is a structurally and functionally unified device, all elements of which are installed in the housing, functionally connected to each other, and together implement the function of recognizing palm veins.

The device is manufactured at the manufacturing plant using standard manufacturing operations (soldering, welding, cutting, threaded connection, etc.), the manufactured elements of the device are mounted in a housing, which is installed at the access control location.

The device body is made of metal, plastic or other suitable material of a size sufficient to accommodate all electronic components. On one of the surfaces of the body there is a lighting unit (containing groups of IR LEDs and, if necessary, light filters) and an image receiving unit (containing a camera and, if necessary, light filters), the operation of the IR LEDs and the camera is controlled by a processing unit (a processor, microprocessor, controller, microcontroller or specialized integrated circuit). The device contains memory elements in communication with the processing unit. The processing unit operates according to the algorithm embedded in it, the essential features (implemented functions) of which are disclosed below, however, a detailed description of the operation of the digital elements is not given here, since it is obvious to a specialist in this field of technology.

Fig. 1 shows the following elements:

101 - device body,

102 - IR LEDs,

103 - image receiving unit,

104 - input for twisted pair information cable, through which power is supplied.

Fig. 1 shows a variant of the arrangement of IR LEDs 102 in a housing 101. The shape of the housing 101 can be square, rectangular, round or oval, which is not related to the essence of the solution, what is essential is that the IR LEDs 102 are arranged around the block 103, combined in pairs. The lighting unit can have its own housing or can be implemented without it, which is not related to the essence of the solution. Preferably, the pairs of IR LEDs 102 are arranged substantially uniformly, by "substantially uniform" arrangement it should be understood such an arrangement, in which the distance between two adjacent pairs does not differ by more than 100% from the average distance between adjacent pairs of IR LEDs 102.

The IR LEDs 102 are combined into pairs, in a pair the IR LEDs 102 are located so close that the distance to the adjacent pair is significantly greater than the distance between the IR LEDs 102 of the pair, in particular, the distance between the pairs is 5 or more times greater than the distance between the IR LEDs 102 in the pair. There may be variants in which a pair of IR LEDs 102 are located in the same housing and they have the same common wire.

Each IR LED 102 in a pair is powered by its own current driver - a device that converts the input power supply to parameters suitable for reliable operation of the IR LEDs 102: it provides a stable current of a given level.

Power is supplied to each current driver via an Ethernet cable connected to input 104. Input 104 is an RJ45 connector containing a latch that prevents the cable from flying out of the connector, which increases the reliability of the declared device.

The use of current drivers ensures a stable operating mode of IR LEDs 102, which extends their service life and provides uniform illumination of the palm, and, as a result, increases the reliability of the entire device for recognizing the vein pattern.

Power supply from input 104 goes to two current drivers, each of which powers its own group of IR LEDs 102. Since each group requires its own optimal current, the use of two correspondingly configured current drivers increases the reliability of the declared device.

The use of two current drivers increases the reliability of the device, since the failure of one driver does not lead to the loss of operability of the device. Since the current drivers supply power to groups in which the IR LEDs 102 are located approximately in one place (in pairs around the camera), then the failure of one current driver and the switching off of one group of IR LEDs 102 does not lead to a change in the illumination pattern. For example, in the case of supplying the right IR LEDs 102 with one driver, and the left ones with another, the failure of one driver and, accordingly, only the right or left IR LEDs 102 would lead to the fact that the right side was darkened, which would lead to greater inaccuracies in palm recognition compared to the option of uniform illumination change (when pairs of IR LEDs 102 are used and one IR LED 102 from each pair goes out). Such recognition inaccuracies could lead to a decrease in the reliability of the device, since it would recognize palms less accurately.

Drivers with linear or pulse current stabilization can be used as current drivers, while pulse stabilization is preferable, since the accuracy of the supported voltage is higher, which ultimately leads to more accurate and reliable palm recognition. Also, the use of pulse current stabilization provides greater efficiency, that is, reduces consumption, which increases the efficiency of the system as a whole, in particular, does not increase the heating of the camera and due to this does not increase parasitic noise in the image, which increases the reliability of the proposed device.

An image receiving unit 103 is located inside the perimeter of the IR LEDs 102. This arrangement of the unit 103 ensures the greatest accuracy of vein pattern recognition, since the palm image is obtained at a right angle.

Description of the device operation

The device is connected to the power supply via an Ethernet cable, power is supplied to the current drivers, from them to the IR LEDs 102, and the processing unit, memory unit and, if necessary, other electronic elements are also supplied via the Ethernet cable.

The user brings the palm to the device for recognizing the pattern of veins of the palm, the palm is illuminated by IR LEDs 102 (they can be switched on constantly or switched on by a command of the processing unit when the presence of the palm is detected by this unit), the light is reflected from the palm and enters the palm image receiving unit 103, which digitizes the palm image and sends it to the processing unit. The processing unit recognizes the vein pattern and compares it with the vein patterns stored in the memory unit. When a match is found between two vein patterns with a given reliability (at this stage, it is preferable to use artificial intelligence technologies), the user is identified, his access rights are determined and a decision is made on granting certain access rights.

The processing unit may send data to a remote computer if its capacity does not allow the necessary operations to be performed quickly enough, which is not the essence of the claimed solution.

Option 1 implementation

In one embodiment, the power supply includes overvoltage protection.

Fuses, protective thyristors, and static discharge protection devices are used as such protection.

In one embodiment, to improve the reliability of the claimed device, a galvanic transformer is installed at the input, which significantly reduces the level of interference, improves the quality and reliability of image recognition. Also, in one embodiment, a voltage limiter and a high-pass filter are installed before the galvanic transformer at the input. The voltage limiter is installed to reduce the risk of failure of the electronic components of the device due to an increase in the input voltage. The high-pass filter is preferably installed to protect the device from short-term voltage surges.

Option 2 of implementation

In one embodiment, the current drivers are designed with the ability to pulse current stabilization, which allows maintaining a specified current with high accuracy, which has a beneficial effect on the operation of the IR LEDs 102 and increases the reliability of the operation of the claimed device.

Option 3 implementation

In one embodiment of the utility model, a device for recognizing the pattern of veins in the palm of the hand is disclosed, comprising:

a housing 101 in which a palm illumination unit, a palm image receiving unit 103, a palm image processing unit are installed,

characterized by the fact that

The palm illumination unit comprises a plurality of IR LEDs 102, evenly distributed around the perimeter of the illumination unit, and a palm image receiving unit 103 is located inside the perimeter of the illumination unit.

In other embodiments, it is disclosed that the IR LEDs 102 are configured to emit at a wavelength of 850 nm; the IR LEDs are configured to emit at a wavelength of 940 nm; the IR LEDs 102 are configured to emit at a wavelength of 850 nm and 940 nm; the palm illumination unit comprises a polarizing filter and the palm image receiving unit 103 comprises a polarizing filter; the palm image receiving unit 103 comprises a filter that transmits radiation with the emission wavelength of the IR LEDs 102; the image processing unit is configured to separately control the brightness of the IR LEDs 102 with different emission wavelengths; the processing unit is configured to determine the distance to the palm; a prompt unit is built into the housing 101, configured to instruct the user on the correct positioning of the palm.

Option 4 implementation

In one embodiment of the utility model, a device for recognizing the pattern of veins in the palm of the hand is disclosed, comprising:

a housing 101 in which a palm illumination unit, a palm image receiving unit 103, a palm image processing unit are installed,

characterized by the fact that

the palm lighting unit comprises a plurality of IR LEDs 102, combined in pairs and located around the perimeter of the lighting unit, and two current drivers, each of which powers one IR LED 102 of the pair,

inside the perimeter of the lighting unit, a palm image receiving unit 103 is located.

In other embodiments, it is disclosed that the IR LEDs 102 are configured to emit at a wavelength of 850 nm; the IR LEDs 102 are configured to emit at a wavelength of 940 nm; wherein the IR LEDs 102 are configured to emit at a wavelength of 850 nm and 940 nm; the palm illumination unit comprises a polarizing filter and the palm image receiving unit 103 comprises a polarizing filter; the palm image receiving unit 103 comprises a filter that transmits radiation with the emission wavelength of the IR LEDs 102; the image processing unit is configured to separately control the brightness of the IR LEDs 102 with different emission wavelengths; the current drivers are configured to pulse current stabilization; a prompt unit is built into the housing 101, configured to instruct the user on the correct positioning of the palm.

The embodiments are not limited to the embodiments described above; other embodiments of the solution that do not go beyond the essence and scope of this solution will become obvious to a person skilled in the art based on the information set forth in the description and knowledge of the prior art.

Elements mentioned in the singular do not exclude a plurality of elements unless otherwise specifically stated.

The methods disclosed herein comprise one or more steps or actions to achieve the described method. The steps and/or actions of the method may replace one another without departing from the scope of the solution formula. In other words, if a specific order of steps or actions is not specified, the order and/or use of specific steps and/or actions may be changed without departing from the scope of the solution formula.

Although exemplary embodiments have been described in detail and shown in the accompanying drawings, it should be understood that such embodiments are illustrative only and are not intended to limit the broader solution, and that the solution should not be limited to the specific arrangements and structures shown and described, since various other modifications may be apparent to those skilled in the art.

The features mentioned in various dependent claims, as well as the implementations disclosed in various parts of the description, can be combined to achieve useful effects, even if the possibility of such a combination is not explicitly disclosed.

Claims (1)

A device for recognizing a palm vein pattern, comprising a housing in which a palm lighting unit, a palm image receiving unit, a palm image processing unit, an Ethernet cable connector, a power supply unit are installed, characterized in that the Ethernet cable connector comprises a cable retainer, the device is configured to receive power via the Ethernet cable, the power supply unit is connected to the Ethernet cable connector and comprises two current drivers for powering the lighting unit; the IR LEDs are divided into groups, each group is configured to receive power from its own current driver; the power supply unit comprises protection against increased voltage and against voltage surges; the current drivers are configured to provide pulse current stabilization.