- Science

How sophisticated is face recognition technology?

Although authentication is based on many factors, according to some experts working at Chinese artificial intelligence companies, the latest surveillance systems are capable of fairly accurate identification.

Their views are based on recent research on surveillance technology outside the face recognition system. These include identifying a partially exposed face, gait and other different physical characteristics.

Face recognition is a technology that is being used but also attracts many mixed opinions. In May 2019, the US city of Oakland banned the use of facial recognition software because of concerns it gave false results.

In China, advances in facial recognition are being used by many cities to “make a name” and embarrass the offender, search for criminals among the crowd or verify the identity of passengers at the airport. . Using sophisticated algorithms, Chinese technology companies and other large enterprises apply the system in retail, tourism and banking.

How does artificial intelligence work in the face recognition system?

The facial recognition system can identify people from an image database, including still images and videos. Using deep learning – a branch of artificial intelligence – will speed up face scanning because it learns more about the data it processes. These systems require huge amounts of information to be faster and more accurate.

These systems produce so-called “unique face marks” for each object through reading and measuring from tens to thousands of “nodes”, including the distance between the face and the width of the nose. , eye socket depth. With a surveillance camere network, the identification system handles many characteristics, including height, age and clothing color.

On the iPhone, its camera can analyze more than 30,000 infrared points and create 3D models of the user’s face. It is designed to accommodate changes in their appearance such as when they wear makeup, wear a hat, scarf, glasses, contact lenses.

Wearing a mask can make technology recognize “give up”?
According to Chinese experts, not really. Advanced facial recognition system capable of analyzing the parts hidden behind a mask, helping narrow objects and make accurate judgments.

Researchers from the University of Bradford (UK) also agree with this idea. They published reports that face recognition technology can identify 100% even if the upper part, right side or 3/4 of the face is exposed.

If the system is only trained to identify the entire face, its success rate will be reduced to 40% when only the eyes and nose are visible, 60% when the lower half of the face is hidden. In contrast, the success rate of systems trained in partial recognition is up to 90% if the eyes and nose are exposed, even with faces that do not show the eyes and the nose.

Several other modern technologies support face recognition
Recognize gait: China’s Startup Watrix introduces software that can identify a person from a distance of 50 meters, even if they hide their faces or turn away from the camera. Technology works by analyzing thousands of data on a person’s gait to build large databases. It includes body shape, arm movement, bowing or bowing. This technology does not require cooperation from the audience.

Voice recognition: Technology is not new, is widely used as smart assistants in cars and appliances. The software is designed to recognize voice, remember personal characteristics and automatically respond. The system combines quite well with surveillance cameras to record sound and analyze user data better.

Heart rate laser: The US Department of Defense has developed a device called Jetson, capable of identifying a unique sign of a person from a distance of 200m or more with an infrared laser. Laser sensors are often used to automatically record a patient’s pulse, detecting changes based on blood flow. Jetson, in contrast, uses a technique called laser vibration to detect surface motion caused by the heartbeat. The Pentagon insists Jetson can be 95% accurate under the right conditions and the future will improve. Its drawback is the need for a large heart rate signature database.

New information about the cannon gun has been discovered in Da Nang

On July 29, Da Nang Museum said that on the basis of research, evaluation, comparison, scientists have discovered many new information about the recently discovered cannon cannon in Hoa Hiep Nam Ward, District. Lien Chieu, Da Nang city at the end of May 2019.

The bronze cannon found in Da Nang has an irregular round cylinder body. The overall gun length is 174.1cm; consists of two parts is the hull (160.3cm long) and the hilt (13.8cm long) with a weight of about 200kg.

The diameter of the rear of the rear gun was 208mm, gradually smaller to the gun mouth, then expanded at the mouth of the gun with a diameter of 146mm. The whole body of the gun has three parts: the chamber of the gunpowder chamber, the gourd gun and the gun barrel.

Inside the gun body is the negative space of the round cylindrical gun barrel, arranged in the center of the center, long from the gun mouth to the bottom of the gun barrel, with a diameter of 60mm …

On the basis of comparison, research and comparison with a number of cannonballs originating from England and the Netherlands, based on the design, structure of gun parts, molding techniques of floating patterns and expressions statues in decorative patterns on gun bodies, gun straps, air vents with bold Dutch brass pistols, plus Han characters that only engraved the simple hand of the Nguyen Dynasty on two rotating axes to guide gunner after each shot can confirm that the cannon discovered in Danang originated from the Netherlands, but is owned by the Nguyen Dynasty.

This gun is very similar in many points with the three Dutch cannons cast in 1640, 1661, 1677-1678 and on display at the Hue Museum of Royal Antiquities.

Researcher Nguyen Quang Trung Tien (Hue University of Science) said that based on the initial research, it can be confirmed that the bronze cannon gun just discovered in Da Nang originated from the Netherlands.

Although not named the foundry and casting year (like some Dutch copper guns kept in Vietnam and some parts of the world), this gun is similar in terms of design, technical structure and Decorative patterns with bronze cannons made by the Netherlands and imported into Vietnam.

The bronze brass cannon of the Netherlands was present in Vietnam in part of Lord Nguyen’s way of salvaging from sunken or stranded Dutch ships in Dang Trong and most of the Trinh donation or trading route. in Tonkin. All roads were imported in the middle of the 17th century.

From the end of the 17th century to the nineteenth century, the bibliographies and related parties’ records no longer recorded the presence of Dutch cannonballs in Vietnam. Therefore, like the bronze cannons originating from the Netherlands still preserved in Vietnam today, the bronze cannons found in Da Nang are about 350 years old.

Mr. Tran Van Chuan, Head of Education and Communication Department – Da Nang Museum, said that after receiving and bringing cannonballs to preserve, handle and serve research, display and promotion of values. , The Museum invited prestigious researchers to participate in the appraisal to bring preliminary information to the public soon.

Through research, it can be seen that, despite being very wounded, this bronze cannon was still mobilized by the owner of the Nguyen Dynasty to fight for the protection of independence and was fortunate not to fall into the hands of like many other bronze guns.

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