/[gzz]/manuscripts/xupdf/article.rst
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revision 1.26 by jvk, Mon Jan 27 07:25:19 2003 UTC revision 1.27 by jvk, Mon Jan 27 09:05:44 2003 UTC
# Line 317  but also: Line 317  but also:
317  Paper  Paper
318  -----  -----
319    
320  A unique background texture is chosen for each PDF file  A unique background texture consisting of random shapes
321  using the identity as a seed.  and colors is chosen for each document using the identity as a seed.
322    The background textures help the user perceive the identity
323    of the most familiar documents at a glance,
324    even when only fragments are shown.
325    
326    The distribution of the textures is designed to be maximally
327    diverse and recognizable using a rough, qualitative model
328    of visual perception.
329    For example, backgrounds with uniformly random pixels would all
330    look the same, because the pixels are not perceived individually,
331    but shapes and overall colors can be independently random to
332    maximize diversity.
333    Making the backgrounds repeating creates well-defined patterns
334    and improves recognizability when fragments are shown.
335    
336  - hw accelerated impl (libpaper)  - hw accelerated impl (libpaper)
 - perception model  
337  - readability  - readability
 - helps especially when fragments of documents are shown  
338  - preattentive  - preattentive
339    
 JVK  
340    
341  Implementation on the Gzz platform  Implementation on the Gzz platform
342  ==================================  ==================================

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