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What is the meaning of Spatial Random Access?

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What is the meaning of Spatial Random Access?

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It is the possibility to have a random access to the various regions of the image. This property goes beyond the possibility of visualizing only a limited area of the image, as it even make it possible to extract gray levels from the color image or to extract possible texts and graphics that lays on the image. What it is important is that in any case there is no need to decode the whole code-stream (the whole image), but only the bytes relative to the component or the region of the image we are interested in.

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