Apparatus and method for hybrid compression of raster data

H - Electricity – 04 – N

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H04N 1/41 (2006.01) G06T 9/00 (2006.01)

Patent

CA 2275284

From a raster page, patches of connected pixels of the same color are identified. Patches of at least a predetermined size, typically corresponding to text or line art objects, are subjected to a lossless compression. Patches below the predetermined size, typically corresponding to image or photo objects, are substantially subjected to a lossy compression. The patch predetermined size controls the mix of lossless and lossy compression procedures. Optimum compression is achieved by maximizing the lossless compression while attaining a targeted compression ratio. Various features include efficient recognition and encoding of patches, refined treatment of the boundaries between the lossless- and the lossy-compressed pixels, adaptive compression ratio control, and fail-safe compression provisions.

Des paquets de pixels reliés de même couleur sont identifiés dans une page à trames. Les paquets ayant au moins une taille prédéterminée, correspondant typiquement à des objets texte ou dessin au trait, sont soumis à une compression sans perte. Les paquets ayant une taille inférieure à la taille prédéterminée, correspondant typiquement à des objets image ou photo, sont sensiblement soumis à une compression avec perte. La taille prédéterminée du paquet de pixels commande le mélange des techniques de compression sans perte et de compression avec perte. On obtient la compression optimum en maximisant la compression sans perte, tout en atteignant un taux de compression ciblé. Parmi les différentes fonctions, on trouve la reconnaissance et le codage efficaces des paquets de pixels, le traitement perfectionné des limites entre les pixels comprimés sans perte et les pixels comprimés avec perte, la commande adaptative du taux de compression et les possibilités de compression avec récupération d'erreur.

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