"Human detection" in commercial facilities, understanding the purpose and solving problems

The purpose of "human detection" in "stations, airports, and commercial facilities" is both security measures and accident prevention. At "stations, airports, and commercial facilities" where an unspecified number of people come and go, there is a risk that suspicious persons may intrude into the crowd. Suspicious people are not only thieves and smugglers of drugs and gold bars, but also terrorists. In addition, there are dangerous areas and spots that require attention in "stations, airports, and commercial facilities."

There is also the risk of people intentionally or carelessly intruding. Such intrusion detection is also an important mission. Specifically, devices and systems such as "biometric authentication information confirmation sensor system", "laser scan system", "image sensor system", "human sensor (infrared sensor)", and "behavior detection solution" have been introduced. .

[Problem to be solved 1] Development of biometric authentication sensor system

Smart cards, PINs, and passwords are commonly used for authentication such as entry and payment, but there are risks such as card theft and PIN leakage. Biometric authentication does not have that concern, but it has the problem of the difficulty of perfect matching. For example, facial recognition may not be legible due to changes in facial features over time, the presence or absence of eyeglasses, or bloodshot eyes. Voice and fingerprint recognition have similar problems.

Each biometric solves this problem by striving to remove all noise and temporal elements from the scanned sample, leaving only the features that can be used for authentication. Still, with a moderate security system, there is 1 mistake in 10,000. Making this probability as close to 100% as possible and realizing "perfect matching" is a challenge for "biometric authentication sensor systems."

[Problem to be solved 2] Development of laser scanning system

A laser scanning system is a measurement system that acquires spatial position information of an object using a laser beam emitted from a scanner. It is possible to acquire a large amount of "planar" "point cloud coordinates in 3D space" in a very short time from a safe distance without contact, non-prism, and intrusion of suspicious persons into important facilities of commercial facilities and airports. prevent

A high-precision detection method identifies the position where an intruder entered from data such as object size, movement distance, and speed. Tracking is also possible by transmitting position information to the PTZ camera. The laser scanning system has advanced to 3D and is almost technically established. In the next phase, the challenge is to expand the application area, such as what kind of equipment and devices the 3D laser scanning system should be incorporated into, and what phenomena should be supplemented.

[Problem to be solved 3] Development of image sensor system

An image sensor system can detect a suspicious person by recognizing the direction of movement from complex human movements. In the future, it is expected to be used in environments where the power supply is limited, and low power consumption is required. Among other things, there is a demand for scalable low power consumption that allows users to normally check images in low power mode and view them in high resolution when they need to be careful.

Also, for close cooperation with the cloud, it is becoming increasingly important to be able to focus on what you want to see in real time. Furthermore, by analyzing the huge amount of image data from the image sensor system using AI, it is possible to highlight information that was not used by humans when looking at things, and to obtain video information that humans overlooked. It is expected that there will be.

[Problem to be solved 4] Human sensor (infrared sensor) development

The human sensor (infrared sensor) measures the infrared rays emitted from the heat source (human body) and detects the number of people in the area, their positions, and their movements. It is possible to detect even when the human body is stationary, and it is possible to measure the dwell time. In the world of infrared sensors, ToF (Time of Flight) is an issue. This is because ToF technology can obtain information in three dimensions.

For example, if a person walks from the front, an automatic door will open, but if a person walks from the side and just passes by the door, the door will not open. It becomes possible. Furthermore, it is also possible to control the opening and closing speed of the door depending on whether the person is running toward the door or walking slowly. The ToF sensor is also useful when counting the number of people in a place instantaneously.

[Problem to be solved 5] Behavior detection system development

The behavior detection system automatically detects suspicious behavior and intruders in real time from camera images. It can be tracked and efficiently monitored for dangerous behavior. By using an intelligent video analysis system, it is possible to analyze behavior and characteristics in real time from surveillance camera images and issue alerts when anomalies are detected. This helps prevent troubles and accidents.

In the future, it will become possible to acquire an even greater amount of video data, but at that time, the storage capacity of the server that receives the video data will increase, and the computational load required for analysis will increase, resulting in high costs and large volumes of data. It is expected that there will be a problem such as an increase in network load due to the transmission of high-definition video. There is a need for a system that can send the minimum necessary feature extraction video information and feature information to the analysis server, and ultimately perform "behavior understanding and prediction" at low cost and high speed.

Summary

In order to ensure that people can use commercial facilities, stations, and airports with peace of mind, human detection devices and systems are essential to prevent accidents and crimes. In order to ensure complete safety, it is necessary to further improve the accuracy of "human detection" devices and systems, increase processing speed, and expand the range of applications. The development of "human detection" devices and systems for commercial facilities, stations, and airports is a challenging frontier for engineers.

Detailed information such as sensors

For the systems I have mentioned so far, articles such as sensors that can be used have been published. If you are interested in more information, please read the article.

• High-precision facial recognition software
• Person tracking sensor that can function even in poor environments such as darkness
• Easy realization of demonstration experiments such as person/object recognition and traffic line detection
• 3D-ToF sensor capable of distance and position shape measurement that is resistant to ambient light

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