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Thermal infrared detection systems play an important role in many areas suchas night security, autonomous driving, and body temperature detection. Theyhave the unique advantages of passive imaging, temperature sensitivity andpenetration. But the security of these systems themselves has not been fullyexplored, which poses risks in applying these systems. We propose a physicalattack method with small bulbs on a board against the state of-the-artpedestrian detectors. Our goal is to make infrared pedestrian detectors unableto detect real-world pedestrians. Towards this goal, we first showed that it ispossible to use two kinds of patches to attack the infrared pedestrian detectorbased on YOLOv3. The average precision (AP) dropped by 64.12% in the digitalworld, while a blank board with the same size caused the AP to drop by 29.69%only. After that, we designed and manufactured a physical board andsuccessfully attacked YOLOv3 in the real world. In recorded videos, thephysical board caused AP of the target detector to drop by 34.48%, while ablank board with the same size caused the AP to drop by 14.91% only. With theensemble attack techniques, the designed physical board had goodtransferability to unseen detectors. We also proposed the first physicalmultispectral (infrared and visible) attack. By using a combination method, wesuccessfully hide from the visible light and infrared object detection systemsat the same time.

Fooling thermal infrared pedestrian detectors in real world using small bulbs