2 rect intersection, union and overlap ratio in opencv Rect

using & and | operator and area() method.

see code

Rect A(100, 100, 100, 100); //x, y, width, hegiht
Rect B(80, 80, 100, 100); //x, y, width, hegiht

printf("intersection area= %d\n", (A&B).area());
printf("union area = %d\n", (A|B).area());
printf("instersection ratio %lf \n", (A&B).area() / float( (A | B).area() ));



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