Patent ID: 7440626

Claim:
A method for scalable image transcoding, comprising; decoding partially an encoded input bitstream of an image to obtain a structure of the encoded input bitstream, in which the encoded input bitstream includes a plurality of quality layers, each quality layer includes a plurality of resolution levels, each resolution level including a plurality of components, each component including a plurality of precincts, and each precinct including a packet partition location, a header length, and a body length; specifying coordinates of a region-of-interest in the image, in which a progressive parameter m specifies a quality a background of the image, and a parameter n specifies a quality of the ROI; constraining the progressive parameters m and n according to: for the region-of-interest, 0≦m<n≦maximum quality, otherwise for the background, 0≦m≦the maximum quality, and for no background, m=0; defining progressive parameters; and encoding the partially decoded input bitstream according to the structure, the coordinates, and the progressive parameters, as an encoded output bitstream.