WO2015180461A1

WO2015180461A1 - Palm vein recognition smart building video intercom system

Info

Publication number: WO2015180461A1
Application number: PCT/CN2014/094464
Authority: WO
Inventors: 徐胜维
Original assignee: 常熟安智生物识别技术有限公司
Priority date: 2014-05-27
Filing date: 2014-12-22
Publication date: 2015-12-03
Also published as: CN105208320A; CN105208320B

Abstract

The present invention discloses a palm vein recognition smart building video intercom system. Comprised are a power supply, a power supply driver circuit, a palm vein capture circuit, an SD card, an SD card interface circuit, a single-chip microcontroller, an LCD display circuit, an LCD display screen, an audio output circuit, a speaker, an RS232/485 communications conversion circuit, and an access controller; the power supply is connected to the single-chip microcontroller by means of the power supply drive circuit; the palm vein capture circuit is connected to the single-chip microcontroller; the SD card is connected to the single-chip microcontroller by means of the SD card interface circuit; the single-chip microcontroller transmits the video information to the LCD display screen by means of the LCD display circuit and is connected to the access controller by means of the RS232/385 conversion circuit; the access controller switch-controls access; the single-chip microcontroller controls the logic communications between the palm vein recognition and the circuitry. The access control of the present invention makes use of biometric recognition technology to accurately recognize user control of an access system, thus safeguarding the security of the cell.

Description

Palm vein recognition intelligent building visual intercom system

Technical field

The invention belongs to the field of biometric identification, and more particularly relates to a palm vein recognition intelligent building visual intercom system for intelligent recognition.

Background technique

The access controller is a new modern security management system. It integrates microcomputer automatic identification technology and modern security management measures. It involves many new technologies such as electronics, machinery, optics, computer technology, communication technology, and biotechnology. It is an effective measure to solve the security management of important departments' entrances and exits. Applicable to various confidential departments, such as banks, hotels, computer rooms, armory, confidential rooms, office rooms, intelligent communities, factories, etc.

The access control system is a system that controls the entrance and exit channels, manages who can access those doors at any time, and provides after-the-fact query statements. It is developed on the basis of traditional door locks, and has already surpassed the simple doorway and key management. It has gradually developed into a complete access management system. It plays a huge role in the administrative work of work environment security, personnel attendance management.

With the development of science and technology, people can add corresponding auxiliary equipment on the basis of access control system to control elevators, vehicle access control, property fire monitoring, security inspection management, food and beverage management, etc.

In the prior art, most of them adopt card management, and the more advanced one adopts biotechnology for verification management, and the palm vein recognition biotechnology has just developed in this field. Palm vein recognition is a kind of vein recognition, which belongs to biometric identification. The palm vein recognition system first obtains the palm vein distribution map through the vein recognition instrument, and extracts the feature value from the palm vein distribution map according to the special comparison algorithm, and obtains the characteristic value through the infrared CCD camera. Images of the fingers, palms, and dorsal veins of the hand store the digital images of the veins in a computer system to store the feature values. When the vein is compared, the vein map is taken in real time to extract the feature values, and the advanced filtering, image binarization and refinement methods are used to extract the features of the digital image, and the venous feature values are stored in the host, and a complex matching algorithm is used. The venous features are matched to identify individuals and confirm their identity.

When the palm vein is used for identity authentication, the image features of the palm vein are acquired, which is a feature that exists only when the palm is in the living body. In this system, the non-living palm is not able to obtain the characteristics of the vein image, and thus cannot be identified, and thus cannot be faked. When using the palm vein for identity authentication, the image of the vein image inside the palm is acquired, not the image feature of the palm surface. Therefore, there is no recognition obstacle due to damage, abrasion, dryness or too wet of the palm surface. When the palm vein is used for identity authentication and the palm vein image is obtained, the palm does not need to be in contact with the device, and the recognition can be completed by gently releasing it. This method has no unsanitary problems when the hand touches the device and the safety problem caused by the surface features of the finger being copied, and avoids the psychological discomfort that is considered as the object of examination, and does not recognize the dirt after being contaminated. . Palm vein approach due to The vein is located inside the palm of the hand, and the influence of external factors such as temperature is negligible and is suitable for almost all users. User acceptance is good. In addition to no direct contact with the scanner surface, this non-invasive scanning process is simple and natural, reducing the user's resistance to fear of hygiene or use. Because of the previous characteristics of living body recognition, internal features and non-contact, it is difficult to forge the user's palm vein features. Therefore, the palm vein recognition system has a high safety level and is particularly suitable for use in places with high safety requirements. However, the following problems still exist in the prior art: (1) belonging to internal physiological characteristics, not wearing, being difficult to forge, and having high safety. (2) The vascular characteristics are usually more obvious, easy to identify, and good in anti-interference. (3) Non-contact measurement can be realized, which is hygienic and easy to accept for users. (4) It is not easily affected by surface scratches or oil stains. The disadvantages of the above technology are that the collection device has special requirements, the design is relatively complicated, and the manufacturing cost is high.

Summary of the invention

1. The object of the invention.

In order to improve the safety factor of the access control system, the palm vein recognition technology is used to control the access control system, and the recognition accuracy of the palm vein can be improved by the invention, and the palm vein recognition intelligent building for intelligent identification is proposed. Intercom system.

2. The technical solution adopted by the present invention.

Palm vein recognition intelligent building visual intercom system, including power supply, power drive circuit, palm vein acquisition circuit, SD card, SD card interface circuit, single chip microcomputer, LCD display circuit, LCD display, audio output circuit, speaker, RS232/485 The communication conversion circuit and the access control controller are connected to the single-chip microcomputer through the power drive circuit, and the palm vein acquisition circuit is connected with the single-chip microcomputer, and the SD card is connected to the single-chip microcomputer through the SD card interface circuit, and the single-chip computer transmits the intercom visual information to the LCD through the LCD display circuit. The display screen transmits the audio prompt through the speaker through the audio output circuit, and is connected to the access controller through the RS232/385 conversion circuit, the access controller controls the door, and the single chip controls the palm vein identification and the logic communication between the circuits. The MCU configures the camera of the OV9650 processor to perform palm vein image extraction and digitization processing for the residents and visitors. The palm vein recognition is performed as follows:

The first step, training and projection of the palm vein image, through the matching of the classifier to obtain five candidate palm vein images, the best projection matrix obtained by training is as follows:

W is the optimal projection matrix, where S _w and S _b are defined as follows:

In the second step, find the best test image in the five candidate palm vein images in the classifier:

a, loading all palm vein image training sets, corresponding to the candidate palm vein;

b. Deriving the deformation of each palm vein from the training set using the fusion palm vein;

c, extracting the deformation of the palm vein test image, expressed as Dq;

d. Match Dq with the previous five candidate palm vein images to find the number of matching key points.

In the third step, the verification criterion is determined by matching the number of key points, and the palm vein descriptor with the largest number of matching points is set as the most probable item, and the target palm vein image is obtained by feature matching.

Preferably, the access controller uses RS485 and TCP/IP for communication, fire alarm, remote control and smart home linkage control, and the access controller information reading mode adopts palm vein recognition mode.

Preferably, the power module comprises: 12V DC power supply for the access controller circuit system; and a fire alarm expansion module: when the access control system is damaged or damaged, the access controller sends the alarm information to the security management center, or Reminder through fire alarm; Ethernet interface: responsible for remote network control information transmission, and provides downlink interface for smart home gateway; door magnetic lock module: according to the closed and closed state of the relay, the magnetic lock is applied, and is specified The operating state of the magnetic lock is detected in the time; the I/O data interface: the information of the palm vein recognition of the single chip is read and transmitted to the access controller for processing; the LED module: displays the operating state of the access controller and the electromagnetic door lock, and displays Identify the status of the information and data and the network; the voice module: according to the palm vein recognition result and the access control information, send voice reminder information to the entry and exit personnel; button interface: button operation for opening the door request and opening the door, sending high and low power through the I/O interface Flat signal; RS485 interface: number through RS232/485 communication adapter and single chip microcomputer Communications.

Preferably, the audio circuit mainly comprises audio input and output processing circuits. Since the audio output signal is an analog signal with a voltage of a few ten millivolts, it is necessary to first perform gain adjustment through the power amplifier circuit, and transmit the digital audio signal converted by the A/D conversion circuit to the control chip.

Preferably, the voltage of the single chip microcomputer is obtained by voltage conversion of the power adapter to obtain 5V, and the 5V voltage is obtained by the low voltage difference voltage regulator AS1117AR-3.3V, and the voltage is regulated by the capacitor, thereby ensuring the components and The interface provides a stable 3.3V voltage and 1.8V and 2.5V for the camera module.

Preferably, the user triggers the camera to transmit its palm vein information to the control terminal, and finally triggers the access control module through the control terminal to complete the door opening action.

3. Advantageous effects of the present invention.

Through the access control method of the invention, the palm vein biometric identification technology can accurately identify the user to control the access control system, ensure the safety of the cell, and the reaction speed is within 8s, thereby improving the accuracy and efficiency of the palm vein recognition.

DRAWINGS

1 is a structural diagram of a palm vein recognition intelligent building visual intercom system according to the present invention.

detailed description

In order to enable the examiner of the patent office, especially the public, to understand the technical essence and the beneficial effects of the present invention, the applicant will be described in detail below by way of examples, but the description of the embodiments is not intended to be It is to be understood that any equivalent changes that are made in the form of the present invention, which are merely formal rather than substantial, are considered to be within the scope of the present invention.

Example

The video intercom access control system requires voice reminders and voice responses to the state of the system execution, as well as voice intercom capabilities. After confirming the identity of the visitor, the system will send a greeting message and other operation reminders. If you confirm the identity of the other party, you will be issued a "Welcome to the warm home" or "Welcome to your presence", and play "trouble" when asking the other party to confirm the identity again. You confirm your identity again, thank you." This voice function highlights the humanized design concept of the system.

Image display and voice reminder, the MCU needs to display on the LCD screen after completing the recognition stage of the palm vein image, and reminds by voice. The image display includes video images of the resident or visitor and the resulting information of the identification. Voice messages mainly include operating voice reminders and greetings. The access control command, the recognition result is the control command of the access control system. After the single-chip computer completes the palm vein recognition result, the information is transmitted to the access controller through the RS232/485 communication adapter, and acts on the electromagnetic mechanism of the access control.

The MCU is equipped with the Wince6.0 operating system with Open CV library function for the TQS3C6410, which realizes the feature extraction and recognition of the palm vein image, and transmits the display result and control command.

The data information storage uses the SD card as a storage device to store the palm vein image and the recognition result into the library, and the operating system can also be loaded into the single chip microcomputer through the SD card startup mode.

Palm vein recognition intelligent building visual intercom system, including power supply, power drive circuit, palm vein acquisition circuit, SD card, SD card interface circuit, single chip microcomputer, LCD display circuit, LCD display, audio output circuit, speaker, RS232/485 The communication conversion circuit and the access control controller are connected to the single-chip microcomputer through the power drive circuit, and the palm vein acquisition circuit is connected with the single-chip microcomputer, and the SD card is connected to the single-chip microcomputer through the SD card interface circuit, and the single-chip computer transmits the intercom visual information to the LCD through the LCD display circuit. The display screen transmits the audio prompt through the speaker through the audio output circuit, and is connected to the access controller through the RS232/385 conversion circuit. The access controller controls the door. The access controller uses RS485 and TCP/IP for communication, fire alarm, Remote control and smart home linkage control, the access control controller information reading mode uses palm vein recognition. The power module includes: 12V DC power supply for the access controller circuit system; and a fire alarm expansion module: When the access control system is damaged or damaged, the access controller sends the alarm information to the security management center, or reminds through the fire alarm; Ethernet interface: the information transmission for remote network control, and provides the downlink interface for the smart home gateway; The electric lock module: according to the closed and closed state of the relay, the magnetic lock is activated, and the operating state of the magnetic lock is detected within a prescribed time; the I/O data interface: reading the information of the palm vein identification of the single chip, and transmitting to the access control Processing in the controller; LED module: display the operation status of the access controller and the electromagnetic door lock, display the identification information and the status of the data and the network; the voice module: according to the palm vein recognition result and the access control information, send a voice reminder to the entry and exit personnel Button interface: button operation for opening the door request and opening the door, sending high and low level signals through the I/O interface; RS485 interface: data communication with the single chip through the RS232/485 communication adapter. The voltage of the single-chip microcomputer is 5V through the power adapter transformer, and the 5V voltage is obtained by the low-dropout voltage regulator AS1117AR-3.3V, and the voltage is regulated by the capacitor to ensure the stability of each component and interface. The 3.3V voltage and 1.8V and 2.5V for the camera module. The audio circuit primarily includes audio input and output processing circuitry. Since the audio output signal is an analog signal with a voltage of a few ten millivolts, it is necessary to first perform gain adjustment through the power amplifier circuit, and transmit the digital audio signal converted by the A/D conversion circuit to the control chip.

The single-chip microcomputer controls the palm vein identification and the logic communication between the circuits. The single-chip computer configures the camera of the OV9650 processor to perform palm vein image extraction and digitization processing for the residents and visitors. The palm vein recognition is performed according to the following steps:

W is the optimal projection matrix, where S _w and S _b are defined as follows:

c, extracting the deformation of the palm vein test image, expressed as Dq;

Claims

A palm vein recognition intelligent building visual intercom system, comprising: a power supply, a power drive circuit, a palm vein acquisition circuit, an SD card, an SD card interface circuit, a single chip microcomputer, an LCD display circuit, an LCD display screen, and an audio output circuit , speaker, RS232/485 communication conversion circuit, access controller, the power supply is connected to the single-chip microcomputer through the power drive circuit, the palm vein acquisition circuit is connected with the single-chip microcomputer, the SD card is connected to the single-chip microcomputer through the SD card interface circuit, and the single-chip microcomputer will intercom through the LCD display circuit. The visual information is transmitted to the LCD display, and the audio prompt is transmitted through the speaker through the audio output circuit, and is connected to the access controller through the RS232/385 conversion circuit, and the access controller performs switching control on the door, and the single-chip microcomputer recognizes between the palm vein and the circuit. The logic communication is controlled, the MCU configures the camera, and the palm vein image is extracted and digitized for the residents and visitors. The palm vein recognition is performed as follows:

The first step, training and projection of the palm vein image, through the matching of the classifier to obtain five candidate palm vein images, the best projection matrix obtained by training is as follows:

W is the optimal projection matrix, where S w and S b are defined as follows:

In the second step, find the best test image in the five candidate palm vein images in the classifier:

a, loading all palm vein image training sets, corresponding to the candidate palm vein;

b. Deriving the deformation of each palm vein from the training set using the fusion palm vein;

c, extracting the deformation of the palm vein test image, expressed as Dq;

d. Match Dq with the previous five candidate palm vein images to find the number of matching key points.

In the third step, the verification criterion is determined by matching the number of key points, and the palm vein descriptor with the largest number of matching points is set as the most probable item, and the target palm vein image is obtained by feature matching.
The palm vein recognition intelligent building visual intercom system according to claim 1, wherein the access controller uses RS485 and TCP/IP for communication, fire alarm, remote control and smart home linkage control, and access controller information reading. The method of palm vein recognition is adopted.
The palm vein recognition intelligent building visual intercom system according to claim 1, wherein: said power supply module: providing 12V DC power supply for the access controller circuit system; and further comprising a fire alarm expansion module: in the access control system Subject to When it is damaged or damaged, the access controller sends the alarm information to the security management center, or reminds through the fire alarm; Ethernet interface: the information transmission responsible for remote network control, and provides the downlink interface for the smart home gateway; Module: According to the closed and closed state of the relay, the magnetic lock is activated, and the operating state of the magnetic lock is detected within a specified time; the I/O data interface: reading the information of the palm vein identification of the single chip, and transmitting to the access controller Medium processing; LED module: display the operation status of the access controller, electromagnetic door lock, display identification information and data and network status; voice module: according to the palm vein recognition result and access control information, send voice reminder information to the in and out personnel; button Interface: button operation for opening the door request and opening the door, sending high and low level signals through the I/O interface; RS485 interface: data communication with the single chip through the RS232/485 communication adapter.
The palm vein recognition intelligent building video intercom system according to claim 1, wherein the audio circuit mainly comprises an audio input and output processing circuit. Since the audio output signal is an analog signal with a voltage of a few ten millivolts, it is necessary to first perform gain adjustment through the power amplifier circuit, and transmit the digital audio signal converted by the A/D conversion circuit to the control chip.
The palm vein recognition intelligent building visual intercom system according to claim 1, wherein: the voltage of the single chip is obtained by a power adapter to obtain 5V, and the 5V voltage is obtained by a low voltage difference voltage regulator AS1117AR-3.3V. And the voltage is regulated by a capacitor to ensure a stable 3.3V voltage for each component and interface and 1.8V and 2.5V for the camera module.
The palm vein recognition intelligent building visual intercom system according to claim 1, wherein the user triggers the camera to transmit the palm vein information to the control terminal, and finally triggers the access control module through the control terminal to complete the door opening action.