Example Transform

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• Original image with two circles having radius 25 and 40
  
  
  
• SHT (x,y) accumulator space at r = 25, r = 32, and r = 40
  
  
  
• Recovered circles from PPHT
  
  
  • Many spurious circles
  • Large circles created from few votes in smaller circles
  • Smaller circles also detected