openmv用draw_rectangle(r0)识别数字模板，r0是模板，怎么才能输出框出r0白框的四角坐标。
print("(%d,%d),(%d,%d),(%d,%d),(%d,%d)" %(r0.x,r0.y,r0.x+r0.w,r0.y,r0.x,r0.y+r0.h,r0.x+r0.w,r0.y+r0.h))