Researchers were able to identify areas of the body where adding pixel noise could confuse AI, in effect turning the wearer invisible. Via WIRED UK (From 2020)
, a key character dons the ugliest T-shirt in the world – a ridiculous-looking garment that magically renders the wearer invisible to CCTV.
“The adversarial T-shirt works on the neural networks used for object detection,” explains Xue Lin, an assistant professor of electrical and computer engineering at Northeastern, and co-author of a recent paper on the subject. Normally, a neural network recognises someone or something in an image, draws a "bounding box" around it, and assigns a label to that object.
Looking specifically at two object-recognition neural networks commonly used for training purposes – YOLOv2 and Faster R-CNN – the team were able to identify the areas of the body where adding pixel noise could confuse the AI, and in effect turn the wearer invisible.This isn’t the first time objects have been designed to try and trick artificial intelligence.
Unlike a stop sign, T-shirts wrinkle and crease when the wearer moves, so the team had to take this into account. The T-shirt researchers are the first to succeed in creating an adversarial example designed to be printed onto a moving material. To do it, they used what Lin calls a “transformer” – a method for measuring the way a T-shirt moves, and then mapping that on to the design.
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