<title>ATM source-channel image coding</title>

Abstract

The Asynchronous Transfer Mode (ATM) appears as the standard protocol for image and video transmision. There is virtually no bandwidth limitations neither a restricted size of operating area. However, the main problem stands in the non secured transmission when ATM native applications are implemented. This induced a new way of encoding images where the redundancy (classically managed by the network protocol) is generated into the CoDec. In this paper, we present the Mojette transform that generates the redundancy at the higher level of the coder in order to safely transmit image data. Block and wavelet implementations associated with the Mojette transform are presented and compared not only from the coder point of view but for the source and the channel characteristics. For this specific case we also present the asynchronous Mojette reconstruction. An adapted object oriented model has been developped accordingly.

Robust Digital Image Reconstruction via the Discrete Fourier Slice Theorem

“…Unfortunately in most practical cases, only aperiodic discrete projections (generally from the MT [6]) exist in various signal and image processing applications ranging from psychovisual analysis [6], data integrity [22], [23], packet networks via an -dimensional MT [24], lossless networking [25], image compression [26], scalable multimedia distribution [27], image coding [28] and watermarking [29], [30]. Recent efforts have also been made to apply the MT to real data with the aim of reducing the number of projections and thus reducing the dose to the subject or object being scanned [31], [32], [18], [19], [33].…”