According to the abstract, this paper discusses ways to decode regions of an image on the fly without needing to do a complete decode of the entire image. A full source implementation with a couple of different licensing options. JJ2000 - An Implementation of the JPEG2000 Standard in Java Rate JJ2000 is a Java implementation of a JPEG 2000 codec. The web site states that JJ2000 is under consideration to be a reference implemenation of the standard. The page also includes links to a white paper, presentations, and other related web pages.
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The committee draft of the JPEG2000 specification. This is not the final specification, but it should be very close. JJ2000 - An Implementation of the JPEG2000 Standard in Java Rate JJ2000 is a Java implementation of a JPEG 2000 codec. The web site states that JJ2000 is under consideration to be a reference implemenation of the standard. The page also includes links to a white paper, presentations, and other related web pages.