Skip to content


Open Access

An Application of MAP-MRF to Change Detection in Image Sequence Based on Mean Field Theory

  • Qiang Liu1Email author,
  • Robert J. Sclabassi1,
  • Ching-Chung Li1 and
  • Mingui Sun1
EURASIP Journal on Advances in Signal Processing20052005:578245

Received: 24 December 2003

Published: 15 August 2005


Change detection is one of the most important problems in video segmentation. In conventional methods, predetermined thresholds are utilized to test the variation between frames. Although certain reasonings about the thresholds are provided, appropriate determination of these parameters is still problematic. We present a new approach to change detection from an optimization point of view. We model the video frames and the change detection map (CDM) as Markov random fields (MRFs), and formulate change detection into a problem of seeking the optimal configuration of the CDM. Under the MRF assumption, the optimal solution, in the sense of maximum a posteriori (MAP), is obtained by minimizing the energy function associated with the MRF which is designed by utilizing the prior knowledge of noise and contextual constraints on the video frames. An algorithm that computes the potentials and optimizes the solution is constructed by applying the mean field theory (MFT). The experimental results show that the new method detects changes accurately and is robust to noise.

Keywords and phrases

change detectionimage processingMarkov random fieldmean field theoryvideo segmentation

Authors’ Affiliations

Laboratory for Computational Neuroscience, Departments of Neurological Surgery and Electrical Engineering, University of Pittsburgh, Pittsburgh, USA


© Liu et al. 2005