utils.py 文件源码

def bbox_iou(box1, box2, x1y1x2y2=True):
    if x1y1x2y2:
        mx = min(box1[0], box2[0])
        Mx = max(box1[2], box2[2])
        my = min(box1[1], box2[1])
        My = max(box1[3], box2[3])
        w1 = box1[2] - box1[0]
        h1 = box1[3] - box1[1]
        w2 = box2[2] - box2[0]
        h2 = box2[3] - box2[1]
    else:
        mx = min(box1[0]-box1[2]/2.0, box2[0]-box2[2]/2.0)
        Mx = max(box1[0]+box1[2]/2.0, box2[0]+box2[2]/2.0)
        my = min(box1[1]-box1[3]/2.0, box2[1]-box2[3]/2.0)
        My = max(box1[1]+box1[3]/2.0, box2[1]+box2[3]/2.0)
        w1 = box1[2]
        h1 = box1[3]
        w2 = box2[2]
        h2 = box2[3]
    uw = Mx - mx
    uh = My - my
    cw = w1 + w2 - uw
    ch = h1 + h2 - uh
    carea = 0
    if cw <= 0 or ch <= 0:
        return 0.0

    area1 = w1 * h1
    area2 = w2 * h2
    carea = cw * ch
    uarea = area1 + area2 - carea
    return carea/uarea