jbig二值图像压缩算法编码实现

This is an encoder for [JBIG2](fcd14492.pdf). JBIG2 encodes bi-level (1 bpp) images using a number of clever tricks to get better compression than G4. This encoder can: * Generate JBIG2 files, or fragments for embedding in PDFs * Generic region encoding * Perform symbol extraction, classification and text region coding * Perform refinement coding and, * Compress multipage documents It uses the (Apache-ish licensed) Leptonica library: http://leptonica.com/ You'll need version 1.68. ## Known bugs The refinement coding causes Acrobat to crash. It's not known if this is a bug in Acrobat, though it may well be. ## Usage See the `jbig2enc.h` header for the high level API, or the `jbig2` program for an example of usage: ``` $ jbig2 -s -p -v *.jpg && pdf.py output >out.pdf ``` to encode jbig2 files for pdf creation. If you want to encode an image and then view output first to include in pdf ``` $ jbig2 -s -S -p -v -O out.png *.jpg ``` If you want to encode an image as jbig2 (can be view in STDU Viewer) run: ``` $ jbig2 -s feyn.tif >feyn.jb2 ```