From: michael.balda@gmail.com   
      
   I'd like to use a pattern projector for computer vision tasks. The pattern can   
   be in the NIR range, should not repeat itself but doesn't need to be described   
   exactly, so random noise, speckle etc. should be fine. It would be   
   preferrable, if the pattern    
   can be restricted to a defined field of view instead of being omni-directional   
   and was stable over time. Of course there are several different approaches but   
   I would like to find one which is    
   (a) cheap,    
   (b) robust,    
   (c) efficient (in terms of power consumption),    
   (d) not too complex,   
   (e) has good availability of components and    
   (f) is monochromatic or has small bandwidth.   
      
   Thanks in advance for any suggestions.   
      
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