Archive for July, 2011


I got a pair of old robot controller boards based on 8051. It could drive four DC motors through its two L293 H-Bridge drivers, a 16×2 character LCD, an RS232 port and plenty of IO pins.But it was based on anĀ  old 8051, and that could be the reason that someone discarded this board in a junkyard.

Robot Controller Board

Robot Controller Board

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The steps for training a haar classifier and detecting an object can be divided into :

  • Creating the description file of positive samples
  • Creating the description file of negative samples
  • Packing the positive samples into a vec file
  • Training the classifier
  • Converting the trained cascade into a xml file
  • Using the xml file to detect the object

Let us see all these steps in detail. View full article »

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