imshow_utils.py 文件源码

def trackbar_create(label, win_name, v, maxv, scale=1.0): 
    global trackbars
    if label in trackbars:     
        raise RuntimeError('Duplicate key. %s already created' % label)
    trackbars[label] = dict(label=label, win_name=win_name, value=v, scale=scale)

    cv2.namedWindow(win_name)
    cv2.createTrackbar(label, win_name, v, maxv, trackbar_update)