figure 1
2

figure 3 4

the image
figure 6
As shown in figure figure 1 and figure 4 is the original figure 3 and figure 6 is identified circle is done with figure 2 and figure 5 binarization figure to identify the
Don't know why I couldn't figure 1 decimal point recognition more clearly than figure 4 decimal point round,,,

 Mat houghCir=new Mat (); 
Imgproc. HoughCircles (threshold, houghCir, Imgproc. HOUGH_GRADIENT, 1, threshold. The rows ()/6, 50, 25, 0, 0). 

The couple, every trouble