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Sensors 2015, 15(9), 21407-21426; doi:10.3390/s150921407

Illumination and Reflectance Estimation with its Application in Foreground Detection

1
Department of Animal Science, Aarhus University, 8830 Tjele, Denmark
2
Department of Engineering, Aarhus University, 8000 Aarhus C, Denmark
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 14 June 2015 / Revised: 18 August 2015 / Accepted: 24 August 2015 / Published: 28 August 2015
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, we introduce a novel approach to estimate the illumination and reflectance of an image. The approach is based on illumination-reflectance model and wavelet theory. We use a homomorphic wavelet filter (HWF) and define a wavelet quotient image (WQI) model based on dyadic wavelet transform. The illumination and reflectance components are estimated by using HWF and WQI, respectively. Based on the illumination and reflectance estimation we develop an algorithm to segment sows in grayscale video recordings which are captured in complex farrowing pens. Experimental results demonstrate that the algorithm can be applied to detect the domestic animals in complex environments such as light changes, motionless foreground objects and dynamic background. View Full-Text
Keywords: grayscale video recordings; homomorphic wavelet filter; wavelet quotient image model; illumination and reflectance estimation; foreground detection grayscale video recordings; homomorphic wavelet filter; wavelet quotient image model; illumination and reflectance estimation; foreground detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tu, G.J.; Karstoft, H.; Pedersen, L.J.; Jørgensen, E. Illumination and Reflectance Estimation with its Application in Foreground Detection. Sensors 2015, 15, 21407-21426.

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