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???
02/25/10 19:51
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#173573 - Muxing and filtering
Responding to: ???'s previous message
It is to be used for low-cost home security - indoor type. Stack-ability is used to increase the range.

The idea behind muxing is that, IR gets dispersed, and the next guy would read true even if it is blocked, which might require some level sensing to differentiate. Please comment.

As far as human-filtering is concerned, common method uses 2 vertical beams spaced 15-18 cms apart, and breakage of 2 beams reports a human intrusion. But then I have read about a method of fixing the parellel bars at an angle to ground and detecting the breaking pattern.

Regards, Raj Nambiar

List of 14 messages in thread
TopicAuthorDate
Perimeter intrusion detection            01/01/70 00:00      
   comments            01/01/70 00:00      
      human-filtering the result            01/01/70 00:00      
         I wonder ...            01/01/70 00:00      
   What's the size (Length, width, height) of the "fence"?            01/01/70 00:00      
      Muxing and filtering            01/01/70 00:00      
         Machine Vision?            01/01/70 00:00      
            Machine vision.            01/01/70 00:00      
               The problem with machine vision            01/01/70 00:00      
                  Thanks Jez, but it would be expensive!            01/01/70 00:00      
         Why not start by answering the questions asked?            01/01/70 00:00      
   Light Curtain            01/01/70 00:00      
      Answers and light curtain            01/01/70 00:00      
         human filtering            01/01/70 00:00      

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