changes_from_vm3_1a.txt

JPEG2000实现的源码

                         CHANGES IN VM3.2A FROM VM3.1A
	                 =============================

          Author: David Taubman
          Affiliation: Hewlett-Packard Research Labs, California, USA
                  and  The University of New South Wales, Sydney, Australia
          Email: [e-mail]

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                                 Documentation
______________________________________________________________________________

* The initial draft of the VM3A document has finally been written and is
  included with the software release in the top-level "vm3a_doc" directory.
  The multiple-file Word 7 document has "vm3a.doc" as its master document.
  Apologies to those who ony have Word 6, but Word 7 is not really even up
  to the task of preparing this document.

______________________________________________________________________________
                       Minor Interface Definition Changes
______________________________________________________________________________

* Some minor changes have been made to the definition of the `extra_lsbs' value
  returned by the `forward_info' and `reverse_info' objects'
  `get_quant_info' function, so as to better reflect the concepts described in
  the VM3A document.

______________________________________________________________________________
               Minor Changes to the Global Header of the Bit-Stream
______________________________________________________________________________

* The bit-stream now contains no explicit reference to implementation
  precision or derived quantities whatsoever.  The previous reference was
  unnecessary, as described in the new VM3A document.

______________________________________________________________________________
                                  Bug Fixes
______________________________________________________________________________

* A bug in the error resilience code (resync markers) has been fixed.
* A bug encountered with multiple image components has been corrected.
* A bug encountered when working with code blocks which are no larger
  than the sub-blocks has been corrected.
* The code now explicitly prohibits the use of the `-iter' argument
  without `-Cno_trunc', since iteration is meaningless when EBCOT
  truncates the bit-stream to satisfy a bit-rate constraint.