===== High Quality Document Image Compression with DjVu =====

//Abstract//:
We present a new image compression technique called "DjVu" that is specifically geared towards 
the compression of high-resolution, high-quality images of scanned documents in color. This enables 
fast transmission of document images over low-speed connections, while faithfully reproducing the 
visual aspect of the document, including color, fonts, pictures, and paper texture. 
The DjVu compressor separates the text and drawings, which needs a high spatial resolution, from 
the pictures and backgrounds, which are smoother and can be coded at a lower spatial resolution. 
Then, several novel techniques are used to maximize the compression ratio: the bi-level foreground 
image is encoded with AT&T's proposal to the new JBIG2 fax standard, and a new wavelet-based 
compression method is used for the backgrounds and pictures. Both techniques use a new adaptive 
binary arithmetic coder called the Z-coder. A typical magazine page in color at 300dpi can be 
compressed down to between 40 to 60 KB, approximately 5 to 10 times better than JPEG for a similar 
level of subjective quality. A real-time, memory efficient version of the decoder was implemented, 
and is available as a plug-in for popular web browsers. 


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Léon Bottou, Patrick Haffner, Paul G. Howard, Patrice Simard, Yoshua Bengio and Yann Le Cun:  **High Quality Document Image Compression with DjVu**,  //Journal of Electronic Imaging//, 7(3):410-425, 1998.

[[http://leon.bottou.org/publications/djvu/jei-1998.djvu|jei-1998.djvu]]
[[http://leon.bottou.org/publications/pdf/jei-1998.pdf|jei-1998.pdf]]
[[http://leon.bottou.org/publications/psgz/jei-1998.ps.gz|jei-1998.ps.gz]]
</box>

  @article{bottou-98,
    author = {Bottou, L\'{e}on and Haffner, Patrick and Howard, Paul G. and Simard, Patrice and Bengio, Yoshua and {Le Cun}, Yann},
    title = {High Quality Document Image Compression with {DjVu}},
    journal = {Journal of Electronic Imaging},
    year = {1998},
    volume = {7},
    number = {3},
    pages = {410-425},
    url = {http://leon.bottou.org/papers/bottou-98},
  }