在图像处理中经常会遇到判断两个矩形是否相交，以及相交的比例的情况，下面是来自TLD算法中源码的求法：
- float bbOverlap(const BoundingBox& box1,const BoundingBox& box2)
- {
- if (box1.x > box2.x+box2.width) { return 0.0; }
- if (box1.y > box2.y+box2.height) { return 0.0; }
- if (box1.x+box1.width < box2.x) { return 0.0; }
- if (box1.y+box1.height < box2.y) { return 0.0; }
- float colInt = min(box1.x+box1.width,box2.x+box2.width) - max(box1.x, box2.x);
- float rowInt = min(box1.y+box1.height,box2.y+box2.height) - max(box1.y,box2.y);
- float intersection = colInt * rowInt;
-
