Detection of dirt impairments from archived film sequences : survey and evaluations

Film dirt is the most commonly encountered artifact in archive restoration applications. Since dirt usually appears as a temporally impulsive event, motion-compensated interframe processing is widely applied for its detection. However, motion-compensated prediction requires a high degree of complexity and can be unreliable when motion estimation fails. Consequently, many techniques using spatial or spatiotemporal filtering without motion were also been proposed as alternatives. A comprehensive survey and evaluation of existing methods is presented, in which both qualitative and quantitative performances are compared in terms of accuracy, robustness, and complexity. After analyzing these algorithms and identifying their limitations, we conclude with guidance in choosing from these algorithms and promising directions for future research

Scratches Removal in Digitised Aerial Photos Concerning Sicilian Territory

In this paper we propose a fast and effective method to detect and restore scratches in aerial photos from a photographic archive concerning Sicilian territory. Scratch removal is a typical problem for old movie films but similar defects can be seen in still images. Our solution is based on a semiautomatic detection process and an unsupervised restoration algorithm. Results are comparable with those obtained with commercial restoration tools

An implementation on FPGA for a time base corrector

The main motivation of this work arose while working on video restoration with old and valuable playback systems but with misalignment between record and playback heads. Brand new systems include systems like the one shown here. This solution aims to solve in a practical and cheap way problems in old but still usable VCR systems to be used as a source for digital restoration. Hereafter an implementation over FPGA of a well documented solution for the digital time base distortion that usually affects magnetic tape recorders for audio and video is presented. A brief explanation about the blocks involved is given as well as a further discussion about the ideas considered to implement the overall design.Eje: Arquitectura, redes y sistemas operativosRed de Universidades con Carreras en Informática (RedUNCI