Characteristics and performance analysis of the three-dimensional body scanner

The three-dimensional body scanner is currently widely used in more industries, especially in the field of textile and apparel, the three-dimensional body scanner and technology realizes significant significance, and the three-dimensional body scanner subverts the traditional human model measurement method, directly Use a non-contact method to scan a person's model, for a specific person, to create a cost of clothing, and the innovation of the three-dimensional body scanner technology also contributes to the application and improvement of 3D printing technology. This article is the characteristics and performance of the Group (Hong Kong) Co., Ltd., introduced you 3D human scanner .

First, the optical scanning technique of the three-dimensional body scanner

The process of three-dimensional body scan is a special light generated by the optical generator, projected to the scanned object On, then the sensor receives the reflected light, and the desired

digital signal is formed by the photoelectric converter, and then the emulation software is converted into spatial point coordinates to present the characteristics of the object. Therefore, the nature of the projected light, that is, the optical scanning technique employed by the device, is a decisive indicator of the device. At present, the optical scanning techniques used in the mainstream three-dimensional body scanner on the market include the following.
1, laser technology scanning The principle of laser technology scan is to use a laser diode emitted out of the light (laser beam) to the surface of the scanned object, the laser beam of the object is projected on the surface shape of the object. The deformation, the sensor (CCD) can receive and record the deformation, converted into a digital image, and the sensor placed in the laser head is moved along the vertical direction (human height direction) of the scanned object, that is, the integrity of the object Scan image.
The Cyberware system in the United States is the first system laser scanner that introduces WB2 and WB4 for clothing applications. Among them, WB4 can scan a cylindrical body of 1.2 m, high 2 m in 12 S, using 4 instruments to accurately capture the side of the human body and difficult to reach, such as the axilla, foot and groin of the human body.
Germany's Tecmath system uses a special laser head system, the camera is located in front of the laser diode with the diffractive optical principle, the measurement time is greatly shortened, only 2 s, and scans the front and behind the body, which reduces the shaking of the human body. Errors caused by non-sense activities.
2, white light technology scanning
White light three-dimensional scanning technology is a three-dimensional non-contact optical measurement technology using structural optical technology, phase measurement technology, computer vision technology, and can be scanned, surface on the surface within a few seconds. The point cloud is almost simultaneously solved. It is different from traditional point-by-point scanning and laser line-by-line scan. The most significant feature is very fast, greatly improves scanning efficiency, and the precision is also relatively high.
The US TC2 is a grating distance in the phase direction in the phase direction according to the moir light projection principle and eachImage of a location. At present, the system is configured with 3 platforms. Each platform has two cameras vertically installed. The camera is connected to form a complete image, which can capture about 95% of the body, can scan 1 m × 1 m × 2 m (length × width × height of objects, the image resolution is 12 mm, accurate 3 mm, and a black and white image can be obtained.
France's Telmat obtains information resources in 1/25 s, and the camera needs 30 s to obtain the entire human body data along the light, only 15 S extracting 70 precise human sizes, presenting a scanning result in the data point cloud. And can be used in conjunction with Get's Accumark Systems or Like System Modaris Software.
3 technology.
Japan's Hamamatsu company and CONUSETTE is a company that mainly sells infrared human scanners. Hamamatsu's human body line scanning system uses a similar infrared light transmitting semiconductor to obtain data scanning, the detector lens is composed of spherical and cylindrical lenses, generating a narrow light on the positioning sensitive detector to make up for one of the probes. shadow. CONUSETTE's Hokuriku is used to scan ladies, which can only measure bust, waist and hip size. The system provides the entire human body balance inspection, judges the most suitable underwear in the shape of the human body, and simulates the future human body change.
Second, three-dimensional body scanner performance evaluation
Scanning method: According to the measurement, the relationship between the human body is divided into contact and non-contact, and the human body measuring instrument in the market is mostly in contact with non-contact.
Photo / sensor: Mainly including the number of optical head / sensors, the data acquisition method, the more the number of head / sensors, the better the data acquisition; synchronous mobile acquisition mode, better acquisition mode . At the same time, the mode of the structural light used in the balun is also an important indicator, and there is a commonly used laser, white light, infrared light, etc.
Measurement Time: Divided into two phases, one stage is the time used by the structural light scanning a complete human body, called a scan time; another stage is the processing and storage time of the instrument to scan data, called data storage time.
Resolution: As the unit, the higher the pixels, the more detailed the description of the scanned object, the higher the reduction or resolution; however, the excessive resolution will cause the output data to be too large, affect 3D The data storage speed and subsequent research work of the human body scanner are handled and utilized.
Measurement accuracy: more MM as unit, indicating measurement results and trueThe difference between the object is in size.During the working process, the three-dimensional body scanner will inevitably cause measurement errors due to the unintentional action of the human breathing, shake, etc.



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