CN201927050U - A face recognition device with infrared human body sensing function - Google Patents

Abstract

The utility model discloses a face recognition device with infrared human body induction function, aiming at providing an energy-saving face recognition device; the control unit is respectively connected with the facial image acquisition system, the facial recognition operation system, the liquid crystal image display system, the auxiliary light source circuit and the infrared human body induction system, when a human body is not induced in set time, the control unit controls the whole device to be in a low-power consumption standby working state, and when the infrared human body induction system induces infrared rays radiated by the human body, the control unit turns on the facial acquisition system and the auxiliary light source; the utility model discloses the low power dissipation is applicable to and uses in the attendance of enterprise.

Description

A face recognition device with infrared human body sensing function

technical field

The utility model relates to a face recognition device, in particular to a face recognition device with an infrared human body sensing function.

Background technique

Among current technologies, biometric identification technology is listed as one of the top ten technologies that have had a revolutionary impact on human society in the 21st century. Biometric identification technology is currently the most convenient and safe identification technology. Biometric identification technology uses people's physiological and behavioral characteristics for identification, mainly including fingerprint recognition, face recognition, and iris recognition. Among them, face recognition is a hot spot in the field of biometric identification. Compared with the currently widely used fingerprint identification technology, it has more obvious features such as intuitiveness, convenience, non-contact, and high user acceptance. Infrared sensing technology is also listed as one of the top ten technologies that have a revolutionary impact on human society in the 21st century. It is used in portable electronics, Internet phones, displays, multimedia information stations, vending machines, interactive toys, clock radios, and Among other applications in consumer and industrial products, many electronic systems benefit from contactless feedback. Infrared proximity sensing provides an optimal method for systems that need to detect the presence of objects. Proximity sensing can also be used to detect motion in up to three dimensions, enabling more advanced and intuitive human-machine interfaces for next-generation electronics. In the security field, infrared sensing technology is also widely used in surveillance video equipment. The surveillance video equipment has a built-in infrared human body sensor. Once someone passes in front of the device, the infrared human body sensor system will trigger the device to automatically record, or trigger an alarm to alarm. From past experience, it can be said that it is full of challenges to integrate advanced human-machine interface design into end products, and must be compromised in terms of performance and power consumption. How to reduce power consumption while maintaining performance has become an urgent technical problem to be solved by those skilled in the art.

Contents of the invention

The technical purpose of this utility model is to overcome the technical problem of high power consumption of face recognition devices in the prior art, and to provide a face recognition device with infrared human body sensing function, which can greatly improve the quality of human face images and improve the image quality. collection speed. It is suitable for users whose height is 150cm to 185cm to register and compare. And through the infrared human body sensing system, when the face is not collected or compared for a long time, the whole machine will enter a low power consumption state, so as to achieve the purpose of energy saving.

For solving the problems of the technologies described above, the technical solution of the utility model is:

A facial recognition device with an infrared human body sensing function, comprising an image acquisition device, an auxiliary light source, an infrared human body sensing system, a control unit, an external communication interface, a liquid crystal image display system, and an output control circuit. Acquisition system, facial recognition computing system, liquid crystal image display system, auxiliary light source circuit and infrared human body sensing system are connected. When the system senses the infrared rays radiated by the human body, the control unit turns on the face acquisition system and the auxiliary light source.

Further, when the low-power standby mode is in operation, the control unit turns off the face acquisition system and the auxiliary light source,

Furthermore, the auxiliary light source includes 18 infrared LED lamps distributed in an array, and its luminous intensity is controllable.

Furthermore, the facial image acquisition system uses a high-definition and high-resolution dual-camera system. The first camera is equipped with a low-pass narrow-band 850nm infrared absorption filter, which filters visible light through an infrared cut-off filter. Basically only through the infrared light in the 850nm band to collect black and white face images. The infrared LED lights distributed in an array are used as auxiliary light sources, so that the lens can normally collect face images in the dark. The second camera, equipped with an infrared cut-off filter, basically only passes through visible light and collects color face images.

Furthermore, the infrared human body sensing system includes a lens, a photosensitive element, a photosensitive circuit, and a control circuit.

Further, the photosensitive element of the infrared human body sensing system includes an infrared detection sensor and an ambient light sensor, the infrared detection sensor can automatically detect the infrared radiation radiated by the human body, and the ambient light sensor can automatically detect the light of the external environment. And adjust the illumination level of the auxiliary light source based on this light.

Further, the infrared human body sensing system adjusts the brightness of the backlight of the display screen by detecting external light, so as to save power.

Furthermore, when the infrared human body sensing system detects that a person is within 70cm of the machine, the trigger control unit sends a control signal and simultaneously turns on the first camera and the second camera; the black and white images collected by the first camera will be sent to the face recognition algorithm System, the system compares the images; and the color image collected by the second camera is also sent to the facial recognition computing system for comparison with the predetermined image set of the system. If the color image collected by the second camera does not match the predetermined image set, The system will judge the poor ambient light of the captured image at this time, and during the comparison process, the system will automatically display the black and white image captured by the first camera on the LCD screen. photo, job number, and name; to indicate approval.

Furthermore, the facial recognition device with an infrared human body sensing system can independently complete user face image collection and comparison, entry and exit record storage, disassembly and abnormal door opening alarm functions.

Furthermore, the panel of the liquid crystal image display system is provided with an indicator light, and the indicator light is an indicator light composed of red, green and blue LEDs; , the machine enters the dormant state, the LCD screen, the camera, and the auxiliary light source power are turned off, and the indicator light will be green. In the working state, the liquid crystal display screen, the camera and the auxiliary light source are powered on, and the face acquisition system starts to work. The first camera sends the collected color face images to the face recognition system for storage, and the second camera sends the collected black and white images to the face recognition system. to the facial recognition system for comparison. The green light is on for 3 seconds if the comparison passes, and the red light is on for 3 seconds if the comparison fails.

When collecting facial images, the user only needs to stand at a distance of 0.65 meters from the facial collection device (applicable to a height range of 1.5 meters to 1.85 meters), and then adjust according to the effect of the facial image obtained by the device. When the facial image is brighter, it can Move backward appropriately; move forward appropriately when the face image is dark.

The beneficial technical effects of the utility model are: by setting an array type distributed infrared LED lamp as an auxiliary light source in the facial image acquisition system, and through the infrared human body induction system, the photosensitive element includes infrared detection and ambient light sensor, automatically detects the external environment light. And adjust the illumination level of the auxiliary light source based on this light. This greatly improves the image quality and image acquisition speed; when the infrared human body sensing system cannot detect the infrared signal radiated by the human body within 10 minutes, the machine will automatically enter the sleep state, which greatly saves the power consumption of the device.

Description of drawings

Fig. 1 is a schematic diagram of the modular structure of an embodiment of the present invention;

Fig. 2 is an appearance panel structural diagram of an embodiment of the present invention;

Fig. 3 is a compositional block diagram of the recognition operation system of an embodiment of the present invention;

Fig. 4 is a working principle diagram of the infrared human body sensing system according to an embodiment of the present invention.

Detailed ways

An embodiment of the facial recognition device with infrared human body sensing function provided by the present utility model will be described in detail below with reference to accompanying drawings 1, 2 and 3 and 4 .

As shown in Fig. 1, 2, in the structure of a kind of facial recognition device with infrared human body sensing function of the present utility model, comprise facial image collection system 1, infrared human body sensing system 2, liquid crystal image display system 3, lock control, Wei Root input, Wiegand output, alarm output device 4 and facial recognition computing system 5 connected to the above-mentioned systems, facial image acquisition system 1 includes an auxiliary light source 12 and image acquisition device 11, in addition, auxiliary light source 12 is compensated by dynamic adjustment The optical circuit 121 is composed of an infrared LED array 122 and also includes a data communication interface 15 . That is to include an image acquisition device 11, an auxiliary light source 12, an infrared human body induction system 2, a control unit, an external communication interface, a liquid crystal image display system 3, and an output control circuit. System, LCD image display system, auxiliary light source circuit and infrared human body sensing system are connected. When the human body is not sensed at the set time, the control unit controls the whole device to perform low-power standby working state. When the infrared human body sensing system senses someone, The control unit turns on the face acquisition system and the auxiliary light source.

The image acquisition device 11 is composed of a color camera 111 and a black and white camera 112, and the CMOS image sensor 1 collects a color image. What the CMOS image sensor 2 collects is a black and white image. The dynamic adjustment supplementary light circuit 12 controls the color camera 111 and the black and white camera 112 to collect the intensity information of the auxiliary light source, the photosensitive element 21 in the infrared human body sensing system 2 detects the infrared signal radiated by the human body in front, and the blue light of the indicator light flashes When the light is on, it means that the machine is in the working state, the liquid crystal display screen, the camera and the auxiliary light source are powered on, and the face collection system starts to work. The weak electrical signal is sent to the control unit 22, and the control unit 22 performs signal amplification, and calculates the compensation value of the brightness of the light source according to the preset parameters, and controls the dynamic adjustment supplementary light circuit 121 to output PWM signals for pulse width modulation to control the infrared LED array 122 The luminous intensity of the fill light. The auxiliary light source 12 and the external ambient light together keep the human face light source for face image recognition at a stable parameter, reduce the change of the system exposure parameter, and make the exposure parameter relatively fixed, thereby improving the number of images extracted by the system. It solves the problems of increasing the exposure time, slow image acquisition, and poor image quality when the external light is weak. The auxiliary light source 12 adopts an infrared LED array light source, which only acts as supplementary light. The system is mainly illuminated by external ambient light sources. Face recognition can be effectively performed during normal ambient light source illumination. Customers can set it to an automatic mode for supplementary light. Infrared LED array 122 has a high-scattering panel in front of it. Under the action of the scattering panel, a uniform plane light source is formed. During installation, the projection direction of the optical lens and auxiliary light source 12 forms an included angle of 42° with the human body. By adjusting the installation height, the When a person uses the system normally, the auxiliary light source 12 forms a certain angle with the plane of the person's face, which effectively solves the problem that the reflected light on the surface of the glasses is too strong and the partial image is caused by the surface of the glasses of the person wearing glasses being perpendicular to the auxiliary light source 12. Oversaturation causes the CMOS image sensor to fail to capture effective eye images, etc.

In this implementation example, the liquid crystal display system 3 adopts a high-resolution TFT LCD display with a resolution of 640x480, which can clearly display the images of the face and iris, and realizes the function of active focusing. Display a color face image, indicating that the current device is in face recognition mode.

Key 3 in this implementation example is defined as: shortcut keys: F1-F6 can be selected. Function: Can be set as function shortcut key, attendance status shortcut key, work number shortcut key. Users only need to press the shortcut key to switch between various modes.

In this implementation example, the infrared human body sensing system starts to work when the machine is powered on.

The specific implementation process of this example: as shown in Figure 3, when the person is in the range of 70cm away from the machine, the infrared detection sensor 211 in the infrared human body induction system on the face recognition device will detect the infrared signal radiated by the human body in front, and the indicator light The blue light flashes once, indicating that the machine is in working state, the LCD screen, camera and auxiliary light source are powered on, the face acquisition system starts to work, and the second camera sends the collected black and white images to the face recognition system for comparison. The color face image collected by the first camera is sent to the facial recognition system for storage, and compared with the predetermined image set of the system. If the color image collected by the second camera does not match the predetermined image set, the system will judge that at this time The ambient light in which the image was captured was poor. During the comparison process, the system will automatically switch, and the LCD screen will display black and white images captured by the first camera.

During the comparison process, the ambient light sensor in the infrared human body sensing system detects the light of the external environment, and converts the sensed external infrared light into a weak electrical signal and sends it to the control unit. The preset parameters calculate the compensation value of the brightness of the light source, and control the dynamic adjustment of the supplementary light circuit to output PWM signals for pulse width modulation to control the luminous intensity of the infrared LED array. Make the auxiliary light source and the external ambient light together keep the human face light source for face image recognition at a stable and reliable parameter, reduce the change of system exposure parameters, and make the exposure parameters relatively fixed.

During the comparison, the system also gives voice and display prompts to the user according to the quality of the collected images, and the user adjusts the posture according to the prompts. The indicator light stays green for 3 seconds, and "Thank you!" will be issued, and the photo, job number, and name of the user will appear on the LCD screen to show that the comparison is passed. The indicator light stays red for 3 seconds, and "Please try again" is issued to indicate that the comparison fails. After the comparison is passed, a lock control signal is sent out. If the lock is connected at this time, the lock will be opened.

As shown in Figure 3, the facial recognition computing system 5 of this embodiment adopted an ARM computing processor circuit, and adopted a master-slave dual-CPU architecture: the master CPU is made of 32-bit 624MHz ARM MIXBIO600CPU; the slave CPU is made of AT89S52, 8-bit high-speed Composed of MCU, the main CPU is respectively connected to peripheral circuits such as LCD display, face acquisition system, real-time clock, switch circuit, etc., to read user keyboard operation data, real-time clock data and transmit information to be displayed, etc., and the slave CPU serves as the system's The auxiliary controller is respectively connected to the key board, battery, 2-way lock control signal output, Wiegand26 output, alarm output device, etc., and completes the serial communication between AT89S52 and the main CPU. When the external power supply is cut off suddenly, the battery will supply power to the machine immediately. Guarantee the normal use of users. When there is a forced disassembly or door opening, the slave CPU will detect an abnormality and send out an alarm signal. When the master CPU fails and cannot work normally, the slave CPU will automatically reset and the machine will restart. The machine resumed normal operation.

Claims (3)

1. face recognition device with infrared human body inducing function, it is characterized in that: comprise image collecting device, secondary light source, the infrared human body induction system, control module, external communication interface, the liquid crystal image display system, and output control circuit, described control module respectively with the facial image acquisition system, the face recognition arithmetic system, the liquid crystal image display system, secondary light source circuit and infrared human body induction system connect, when setting-up time is not sensed the infrared ray of human body radiation, control module is controlled whole device and is carried out the low-power consumption standby duty, when hot outer human body induction system was sensed the infrared ray of human body radiation, control module was opened facial acquisition system and secondary light source.

2. a kind of face recognition device with infrared human body inducing function according to claim 1 is characterized in that: described secondary light source includes the infrared LED lamp that 18 arrays distribute, and its luminous intensity is controlled.

3. a kind of face recognition device with infrared human body inducing function according to claim 1, it is characterized in that: described infrared human body induction system comprises lens, photo-sensitive cell, photosensitive circuit, control circuit.

Images