How to use

intersection

method

in

boofcv.struct.ImageRectangle

/**
 * Computes the fractional area of intersection between the two regions.
 *
 * @return number from 0 to 1.  higher means more intersection
 */
public double computeOverlap( ImageRectangle a , ImageRectangle b ) {
  if( !a.intersection(b,work) )
    return 0;
  int areaI = work.area();
  int bottom = a.area() + b.area() - areaI;
  return areaI/ (double)bottom;
}