| 摘要 |
An apparatus and corresponding method ( 10 ) for reencoding an input image already encoded in some format in order to provide a possibly more suitable encoding, based on whether the input image is determined by the system to be a graphic image (i.e. an artificial image) or a natural image (i.e. for example photographs of real world objects). The invention uses a decision function (f) having some predetermined parameters (alpha,beta,lambda) that are constant or are changed only occasionally so as to refine their values, and also uses some inputs (c,r,d) that correlate in some way with the naturalness of an image and are determined by analyzing the input image using several analyzer modules ( 11 a 11 b 11 c). The value of the decision function (f) is compared to a threshold, or two various thresholds in a table ( 12 c) of thresholds versus predetermined formats, to decide on what format to use to reencode the image.
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