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--- papers:lecun-2001 [2006/12/13 14:07]
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 ===== DjVu document browsing with on-demand loading and rendering of image components =====
+//Abstract//:
+Image-based digital documents are composed of multiple pages, each of which may be composed of multiple
+components such as the text, pictures, background, and annotations. We describe the image structure and software
+architecture that allows the DjVu system to load and render the required components on demand while minimizing
+the bandwidth requirements, and the memory requirements in the client. DjVu document files are merely a list of
+enriched URLs that point to individual files (or file elements) that contain image components. Image components
+include: text images, background images, shape dictionaries shared by multiple pages, OCR-ed text, and several types
+of annotations. A multithreaded software architecture with smart caching allows individual components to be loaded
+and pre-decoded and rendered on-demand. Pages are pre-fetched or loaded on demand, allowing users to randomly
+access pages without downloading the entire document, and without the help of a byte server.