Vision based distance estimation from single RGB camera using field of view and magnification measurements –an AI based non triangulation technique for person distance estimation in surveillance areas

Issue title: Fuzzy System for Economy Back on Track

Guest editors: Anand Paul, Simon K.S. Cheung, Chiung Ching Ho and Sadia Din

Article type: Research Article

Authors: Alphonse, P.J.A.^{a; *} | Sriharsha, K.V.^b

Affiliations: [a] Department of Computer Applications, NIT Trichy, Tamil Nadu, India | [b] Research Scholar, Department of Computer Applications, NIT Trichy, Tamil Nadu, India

Correspondence: [*] Corresponding author. P.J.A. Alphonse, Department of Computer Applications, NIT Trichy, Tamil Nadu, India. E-mail: pjaalphonse@gmail.com.

Abstract: Depth data from conventional cameras in monitoring fields provides a thorough assessment of human behavior. In this context, the depth of each viewpoint must be calculated using binocular stereo, which requires two cameras to retrieve 3D data. In networked surveillance environments, this drives excess energy and also provides extra infrastructure. We launched a new computational photographic technique for depth estimation using a single camera based on the ideas of perspective projection and lens magnification property. The person to camera distance (or depth) is obtained from understanding the focal length, field of view and magnification characteristics. Prior to finding distance, initially real height is estimated using Human body anthropometrics. These metrics are given as inputs to the Gradient-Boosting machine learning algorithm for estimating Real Height. And then magnification and Field of View measurements are extracted for each sample. The depth (or distance) is predicted on the basis of the geometrical relationship between field of view, magnification and camera at object distance. Using physical distance and height measurements taken in real time as ground truth, experimental validation is performed and it is inferred that with in 3m–7 m range, both in indoor and outdoor environments, the camera to person distance (Preddist) anticipated from field of view and magnification is 91% correlated with actual depth at a confidence point of 95% with RMSE of 0.579.

Keywords: Focal length, magnification, field of view, sensor size, perspective projection, anthropometrics

DOI: 10.3233/JIFS-189583

Journal: Journal of Intelligent & Fuzzy Systems, vol. 40, no. 4, pp. 7635-7651, 2021