Security scanner machines are indispensable devices in ensuring the safety of public places. They utilize advanced technologies such as computer science, sensors, and scanners, combined with human assistance, to provide automated security checks.

Overview of Security Scanner Machines
Security scanner machines are electronic devices designed to thoroughly examine items entering public spaces and to measure the body temperature of travelers. These machines quickly and accurately detect any dangerous objects within luggage and identify potential threats.

Working Principles
1. X-ray Imaging
X-ray imaging is the core technology of security scanner machines. X-rays are electromagnetic waves capable of penetrating opaque objects like wood, cardboard, and leather. When X-rays pass through an object, they are absorbed or scattered in varying degrees, depending on the material’s density and atomic structure.

The X-rays penetrate the object and are captured by a detector on the other side, creating an image of the internal structure.

2. Dual-energy X-ray Imaging
Advanced security scanners use dual-energy X-ray imaging to provide more detailed information about the scanned objects. This technique involves emitting two sets of X-rays with different energy levels and analyzing the resulting transmission signals.

The high-energy and low-energy X-rays are measured separately, and the ratio of their signals is used to determine the effective atomic number of the material.

By comparing the attenuation of high-energy and low-energy X-rays, the scanner can determine the effective atomic number of the material, which is a good indicator of its elemental composition. This information is used to create a pseudocolor image, where metals and alloys appear blue, and lower-density materials show as green or orange.

3. Sensor Detection
In addition to X-ray imaging, sensors are used to detect the presence of dangerous substances within luggage. These sensors can identify specific materials, such as explosives or narcotics, based on their chemical properties.

The sensors analyze the chemical composition of the scanned items and alert the operator if any dangerous substances are detected.

4. Multi-view Imaging
To address the challenge of overlapping objects in luggage, multi-view imaging techniques are employed. These techniques involve capturing X-ray images from multiple angles, allowing the reconstruction of a three-dimensional representation of the scanned items.

X-rays are emitted from different angles, and the resulting images are combined to create a 3D representation of the scanned object.

By combining images from various perspectives, security personnel can better distinguish between overlapping objects and identify potential threats more accurately.

5. Image Processing and Storage
The images captured by the security scanner are processed using advanced image processing algorithms. These algorithms enhance the clarity and contrast of the images, making it easier for operators to identify suspicious items.

The raw X-ray images are processed to enhance their clarity and contrast, making it easier to identify suspicious items.

The processed images are stored automatically or manually by the operator, depending on the system configuration. This allows for easy retrieval and review of past scans, ensuring a comprehensive security record.

Human Assistance
While technology plays a crucial role in security scanning, human assistance is still necessary. Operators monitor the images and alerts generated by the scanner and conduct further inspections if any suspicious items are detected.

The operator monitors the scanner display and conducts further inspections if necessary.