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Intelligent CCTV for Mass Transport Security : challenges and Opportunities for Video and Face Processing
Sanderson, Conrad (NICTA (Brisbane, Austràlia))
Bigdeli, Abbas (NICTA (Brisbane, Austràlia))
Shan, Ting (University of Queensland. ITEE)
Chen, Shaokang (University of Queensland. ITEE)
Berglund, Erik (University of Queensland. ITEE)
Lovell, Brian C. (University of Queensland. ITEE)

Data: 2007
Resum: CCTV surveillance systems have long been promoted as being effective in improving public safety. However due to the amount of cameras installed, many sites have abandoned expensive human monitoring and only record video for forensic purposes. One of the sought-after capabilities of an automated surveillance system is “face in the crowd” recognition, in public spaces such as mass transit centres. Apart from accuracy and robustness to nuisance factors such as pose variations, in such surveillance situations the other important factors are scalability and fast performance. We evaluate recent approaches to the recognition of faces at large pose angles from a gallery of frontal images and propose novel adaptations as well as modifications. We compare and contrast the accuracy, robustness and speed of an Active Appearance Model (AAM) based method (where realistic frontal faces are synthesized from non-frontal probe faces) against bag-of-features methods. We show a novel approach where the performance of the AAM based technique is increased by side-stepping the image synthesis step, also resulting in a considerable speedup. Additionally, we adapt a histogram-based bag-of-features technique to face classification and contrast its properties to a previously proposed direct bag-of-features method. We further show that the two bag-of-features approaches can be considerably sped up, without a loss in classification accuracy, via an approximation of the exponential function. Experiments on the FERET and PIE databases suggest that the bag-of-features techniques generally attain better performance, with significantly lower computational loads. The histogrambased bag-of-features technique is capable of achieving an average recognition accuracy of 89% for pose angles of around 25 degrees. Finally, we provide a discussion on implementation as well as legal challenges surrounding research on automated surveillance.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Vigilància ; Anàlisi de video ; Classificació de cara ; Vigilancia ; Análisis de video ; Clasificación de cara ; Surveillance ; Video analysis ; Face classification ; Pose ; Bag of words ; AAM ; GMM
Publicat a: ELCVIA : Electronic Letters on Computer Vision and Image Analysis, V. 6 n. 3 (2007) p. 30-41, ISSN 1577-5097

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