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--- papers:bottou-98 [2006/12/13 13:59]
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+++ papers:bottou-98 [2012/04/02 20:22] (current)
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 ===== 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.