对工会理解的交集？

Question

正在在线阅读一些代码以在 python 中实现 IOU，其中大部分部分我非常了解，但对于它的核心数学存在一些混淆。

这是代码：

def get_iou(boxA, boxB):
    # This will calculate boxes given in any order...
    # This will get max value between 2 boxes becuase max mening overlapping 
    # area just begins for x 
    interxA = max(boxA[0], boxB[0])
    # This will get max value between 2 boxes becuase max mening overlapping 
    # area just begins for y
    interyA = max(boxA[1], boxB[1])
    # This will get min value between 2 boxes becuase min mening overlapping 
    # area just begins for x because bottom right should be less as it's ending
    interxB = min(boxA[2], boxB[2])
    # This will get min value between 2 boxes becuase min mening overlapping 
    # area just begins for y because bottom right should be less as it's ending
    interyB = min(boxA[3], boxB[3])

    # Now basic concept to find area of any rectangle in co-ordinate plane we 
    # can think in this way, this is values top-left: (xa, ya), 
    # bottom-right: (xb, yb)
    # (xb - xa + 1) * (yb - ya + 1) this formula will yield us the area of that 
    # rectangle


    # this will find area of intersection rectangle
    interArea = max(0, interxB - interxA + 1) * max(0, interyB - interyA + 1)

    boxAarea = (boxA[2] - boxA[0] + 1) * (boxA[3] - boxA[1] + 1)
    boxBarea = (boxB[2] - boxB[0] + 1) * (boxB[3] - boxB[1] + 1)

    return (interArea / (boxAarea + boxBarea - interArea))

在上面的代码中，为什么我们使用“+ 1”作为代码的一部分，因为我检查了有没有这样的代码：get_iou([25, 25, 175, 200], [45, 45, 175, 200])它改变了，但只有几个小数位？ 如果我使用它是否重要，如果某些机构甚至可以解释我们为什么需要它，这将更有帮助。 提前致谢。

Answer 1

这可能是一个代码调整，以防止分数的分母在某些情况下为 0。 例如，如果我们从代码中删除+1并且两个框相等，我们会得到返回 0/0。 在数学上这被解释为 1，但在计算上这将是一个数学错误。