4D light-field sensing system for people counting

Guangqi Hou; Chi Zhang; Yunlong Wang; Zhenan Sun

doi:10.1117/12.2212974

3 March 2016 4D light-field sensing system for people counting

Guangqi Hou, Chi Zhang, Yunlong Wang, Zhenan Sun

Proceedings Volume 9751, Smart Photonic and Optoelectronic Integrated Circuits XVIII; 975114 (2016) https://doi.org/10.1117/12.2212974
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Counting the number of people is still an important task in social security applications, and a few methods based on video surveillance have been proposed in recent years. In this paper, we design a novel optical sensing system to directly acquire the depth map of the scene from one light-field camera. The light-field sensing system can count the number of people crossing the passageway, and record the direction and intensity of rays at a snapshot without any assistant light devices. Depth maps are extracted from the raw light-ray sensing data. Our smart sensing system is equipped with a passive imaging sensor, which is able to naturally discern the depth difference between the head and shoulders for each person. Then a human model is built. Through detecting the human model from light-field images, the number of people passing the scene can be counted rapidly. We verify the feasibility of the sensing system as well as the accuracy by capturing real-world scenes passing single and multiple people under natural illumination.

Citation Download Citation

Guangqi Hou, Chi Zhang, Yunlong Wang, and Zhenan Sun "4D light-field sensing system for people counting", Proc. SPIE 9751, Smart Photonic and Optoelectronic Integrated Circuits XVIII, 975114 (3 March 2016); https://doi.org/10.1117/12.2212974

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KEYWORDS

Cameras

Head

Sensors

Sensing systems

Imaging systems

Microlens array

Optical design

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