detector.py

def detectar_elipse(self,num_pixeles,im,centro,puntos,fondo):
        pixels=im.load()
        inicio=centro
        #print centro
        x,y=int(centro[0]),int(centro[1])
       # print x
       # print y
        im.save('checar.png')
        a=self.semidiametrox(x,y,pixels,im,fondo)
       # print 'regreso'
        b=self.semidiametroy(x,y,pixels,im,fondo)
      #  print 'area',num_pixeles
      #  print 'a',a
      #  print 'b',b
        area1=pi*a*b
        if area1==num_pixeles:
       #     print 'es elipse'
            return True
        #raw_input()
       # im.save('checar.png')
        #while True:

    def semidiametrox(self,aumenta,igual,pixels,im,fondo):
        print 'sacando semidiametro'
        pixels=im.load()
        a=0
       # print 'aumenta',aumenta
       # print 'igual',igual
       # pixels[aumenta][igual]==(0,0,0)
        while True:
            if (pixels[aumenta,igual]==fondo):
              #  print 'entro al if'
                aumenta +=1
                a +=1 
              #  pixels[aumenta,igual]==(23,44,123)
            else:
                break
            #im.save('porfas.png')
        return a
    def semidiametroy(self,igual,aumenta,pixels,im,fondo):
        print 'sacando semidiametro'
        pixels=im.load()
        b=0
       # print 'aumenta',aumenta
       # print 'igual',igual
       # pixels[aumenta][igual]==(0,0,0)                                                                                                       
        while True:
            if (pixels[igual,aumenta]==fondo):
        #        print 'entro al if'
                aumenta +=1
                b +=1
              #  pixels[aumenta,igual]==(23,44,123)                                                                                            
            else:
                break
        return b