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Image authentication and restoration using irregular sampling for traffic enforcement applications

Zhu, X, Ho, ATS and Marziliano, P (2006) Image authentication and restoration using irregular sampling for traffic enforcement applications In: 1st International Conference on Innovative Computing, Information and Control (ICICIC 2006), 2006-08-30 - 2006-09-01, Beijing, PEOPLES R CHINA.

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Abstract

Traffic image sequences are important information for the purpose of traffic system control and traffic accidents surveillance, for example, the determination of offending vehicles. A semi-fragile watermarking method for the automatic authentication and restoration of traffic images using irregular sampling is described. Watermarks are embedded into the pinned field of the pinned sine transform (PST) of the original image, which reflects local malicious tampering on the texture of the image. When tampered blocks are detected, the restoration problem is formulated as an irregular sampling problem in approximation subspaces. These blocks are then reconstructed, making use of the information embedded in the same watermarked image, through iterative projections onto convex sets in approximation subspaces. The restoration process is a variant of the Papoulis- Gerchberg algorithm, and is robust to common image processing operations such as lossy transcoding and image filtering.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Faculty of Engineering and Physical Sciences > Computing Science
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:45
Last Modified: 23 Sep 2013 18:35
URI: http://epubs.surrey.ac.uk/id/eprint/1874

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