University of Bristol

Automatic quality improvement of archived film and video

Xiaosong Wang, Majid Mirmehdi

This project is proposed by ITV to develop accurate restoration algorithms for archived film and video. The final aim is to produce an automated quality control arcfilmand improvement system targeting on dirt and blotches in digitized archive films. The system is composed of mainly two modules: defect detection and defect removal. In defect detection, we locate the defects by combing temporal and spatial information across a number of frames.

An HMM is trained for normal observation sequences and then applied within a framework to detect defective pixels. The resulting defect maps are refined in a two-stage false alarm elimination process and then passed over to the defect removal procedure. A labelled (degraded) pixels is restored in a multiscale framework by first searching the optimal replacement in its dynamically generated, random walk based region of candidate pixel-exemplars and then updating all its features (intensity, motion and texture).

Finally, the proposed system is compared against state-of-the-art methods to demonstrate improved accuracy in both detection and restoration using synthetic and real degraded image sequences.