The latest release of JBIG-KIT can be downloaded from
http://www.cl.cam.ac.uk/~mgk25/jbigkit/
JBIG-KIT implements JBIG1, a highly effective data compression
algorithm for bi-level high-resolution images such as fax pages
or scanned do***ents.
JBIG-KIT provides two variants of a ****table library of compression
and decompression functions with a do***ented interface. You can very
easily include into your image or do***ent processing software. In
addition, JBIG-KIT provides ready-to-use compression and decompression
programs with a simple command line interface (similar to the
converters found in Jef Poskanzer's PBM graphics file conversion
package).
Major new feature in version 2.0:
light-weight, low-memory, streaming T.85-profile implementation
The JBIG-KIT 1.x implementation was designed to be feature-rich. It
implemented most facilities of the standard, in particular progressive
coding (multiple resolution layers). To offer this flexibility, the
library has to keep the entire uncompressed image in memory during
processing. Many JBIG1 users use only a much simpler subset of the
standard that was defined in ITU-T Recommendation T.85 for use in
black/white (1 bit/pixel) fax machines. For those users, the new
release 2.0 of JBIG-KIT offers -- in addition to the existing
full-featured library -- also a new light-weight jbig85.c library that
sup****ts *only* the T.85 subset of the standard, that leaves
memory allocation entirely to the caller, and that requires only three
lines of the image to reside in memory at any time. It is particularly
suited for low-memory footprint implementations in embedded systems
and for applications that need to process images larger than the
available memory. The new jbig85.c library also handles the VLENGTH
option and NEWLEN marker segments more easily and in a single pass.
For other changes, see
http://www.cl.cam.ac.uk/~mgk25/jbigkit/CHANGES
*** Happy compressing ***
Markus
--
Markus Kuhn, Computer Laboratory, University of Cambridge
http://www.cl.cam.ac.uk/~mgk25/
|| CB3 0FD, Great Britain
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