Chinese authorities have begun deploying a new surveillance tool: “gait recognition” software that uses people’s body shapes and how they walk to identify them, even when their faces are hidden from cameras.
Already used by police on the streets of Beijing and Shanghai, “gait recognition” is part of a push across China to develop artificial-intelligence and data-driven surveillance that is raising concern about how far the technology will go.
Huang Yongzhen (黃永禎), the CEO of Watrix, said that its system can identify people from up to 50 meters away, even with their back turned or face covered. This can fill a gap in facial recognition, which needs close-up, high-resolution images of a person’s face to work.
Photo: AP
“You don’t need people’s cooperation for us to be able to recognize their identity,” Huang said in an interview in his Beijing office. “Gait analysis can’t be fooled by simply limping, walking with splayed feet or hunching over, because we’re analyzing all the features of an entire body.”
Watrix announced last month that it had raised 100 million yuan (US$14.5 million) to accelerate the development and sale of its gait recognition technology, according to Chinese media reports.
Chinese police are using facial recognition to identify people in crowds and nab jaywalkers, and are developing an integrated national system of surveillance camera data. Not everyone is comfortable with gait recognition’s use.
Photo: AP
Security officials in China’s far-western province of Xinjiang, a region whose Muslim population is already subject to intense surveillance and control, have expressed interest in the software.
SOCIAL CONTROL
Shi Shusi, a Chinese columnist and commentator, says it’s unsurprising that the technology is catching on in China faster than the rest of the world because of Beijing’s emphasis on social control.
“Using biometric recognition to maintain social stability and manage society is an unstoppable trend,” he said. “It’s great business.”
The technology isn’t new. Scientists in Japan, the UK and the US Defense Information Systems Agency have been researching gait recognition for over a decade, trying different ways to overcome skepticism that people could be recognized by the way they walk.
Professors from Osaka University have worked with Japan’s National Police Agency to use gait recognition software on a pilot basis since 2013.
But few have tried to commercialize gait recognition. Israel-based FST Biometrics shut down earlier this year amid company infighting after encountering technical difficulties with its products, according to former advisory board member Gabriel Tal.
COMPLEX BIOMETRICS
“It’s more complex than other biometrics, computationally,” said Mark Nixon, a leading expert on gait recognition at the University of Southampton in Britain. “It takes bigger computers to do gait because you need a sequence of images rather than a single image.”
Watrix’s software extracts a person’s silhouette from video and analyzes the silhouette’s movement to create a model of the way the person walks. It isn’t capable of identifying people in real-time yet. Users must upload video into the program, which takes about 10 minutes to search through an hour of video. It doesn’t require special cameras — the software can use footage from surveillance cameras to analyze gait.
Huang, a former researcher, said he left academia to co-found Watrix in 2016 after seeing how promising the technology had become. The company was incubated by the Chinese Academy of Sciences. Though the software isn’t as good as facial recognition, Huang said its 94 percent accuracy rate is good enough for commercial use.
He envisions gait recognition being used alongside face-scanning software.
Beyond surveillance, Huang says gait recognition can also be used to spot people in distress such as elderly individuals who have fallen down. Nixon believes that the technology can make life safer and more convenient.
“People still don’t recognize they can be recognized by their gait, whereas everybody knows you can be recognized by your face,” Nixon said. “We believe you are totally unique in the way you walk.”
— Additional reporting by Olivia Zhang
Seven hundred job applications. One interview. Marco Mascaro arrived in Taiwan last year with a PhD in engineering physics and years of experience at a European research center. He thought his Gold Card would guarantee him a foothold in Taiwan’s job market. “It’s marketed as if Taiwan really needs you,” the 33-year-old Italian says. “The reality is that companies here don’t really need us.” The Employment Gold Card was designed to fix Taiwan’s labor shortage by offering foreign professionals a combined resident visa and open work permit valid for three years. But for many, like Mascaro, the welcome mat ends at the door. A
If China attacks, will Taiwanese be willing to fight? Analysts of certain types obsess over questions like this, especially military analysts and those with an ax to grind as to whether Taiwan is worth defending, or should be cut loose to appease Beijing. Fellow columnist Michael Turton in “Notes from Central Taiwan: Willing to fight for the homeland” (Nov. 6, page 12) provides a superb analysis of this topic, how it is used and manipulated to political ends and what the underlying data shows. The problem is that most analysis is centered around polling data, which as Turton observes, “many of these
Since Cheng Li-wun (鄭麗文) was elected Chinese Nationalist Party (KMT) chair on Oct. 18, she has become a polarizing figure. Her supporters see her as a firebrand critic of the ruling Democratic Progressive Party (DPP), while others, including some in her own party, have charged that she is Chinese President Xi Jinping’s (習近平) preferred candidate and that her election was possibly supported by the Chinese Communist Party’s (CPP) unit for political warfare and international influence, the “united front.” Indeed, Xi quickly congratulated Cheng upon her election. The 55-year-old former lawmaker and ex-talk show host, who was sworn in on Nov.
Even the most casual followers of Taiwan politics are familiar with the terms pan-blue and pan-green. The terms are used so casually and commonly with the assumption that everyone knows what they mean, that few stop to really question it. The way these terms are used today is far broader and extensive than what they were originally created to represent. Are these still useful shorthand terms, or have people become so obsessed with them that they color perceptions to the point of distortion? LEE TUNG-HUI WAS NO SMURF People often assume that these terms have been around forever, or at least as
RSS