This paper presents a new technique which allows interactive optimization of video compression algorithms using massively parallel computers such as the CRAY T3D. This work aims to exploit as much as possible the parallel nature of digital image processing algorithms to obtain almost real-time computing with the exibility o f a software implementation. Thanks to this low computation time, interactive tools have been developed which allow easy and fast visual evaluation of image quality. This leads to signi cant productivity gain when developing new video compression techniques. Our approach has been validated on advanced region-based video compression algorithms. The interactive facilities o ered by the proposed technique permit the accurate optimization of the algorithm parameters in few minutes, where several days were previously needed. Depending on the complexity of the compression algorithms, 8-12 images are compressed, decompressed and visualized per second.
O ensaio pretende estimular a realização de experimentos prismáticos com recursos muito simples e, com isso, facilitar o acesso aos fundamentais estudos de Goethe sobre cor, a "Farbenlehre". O encarte anexo contém fotos de um processo prismático complementar, produzido por Imagens-Modelo em Claro-Escuro neutro. Contém ainda fotos de imagens prismáticas produzidas por Imagens-Modelo em cores.
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