Question

我有牛棚的视频。我想在那中间弄食物容器的角。我正尝试通过以下步骤来完成任务-

1. Freeze the video into the first frame (done using waitkey set to 0)
2. Pass the first frame into draw_circle function to get the corners
3. Play the video regularly after the first frame (done using changing waitkey value)

但是，我无法实现第二个目标。当框架冻结时，我单击了多个点，但鼠标列表仍然为空。有什么办法吗？下面提供了代码-

# import libraries
import cv2, numpy as np

# the point location will be saved into the mouse list
mouse = []

# define the function to get point location
def draw_circle(event,x,y,flags,param):
    global ix,iy
    if event == cv2.EVENT_LBUTTONDBLCLK:
        cv2.circle(img,(x,y),100,(255,0,0),-1)
        ix,iy = x,y
        mouse.append([x,y])

# waitKey to freeze the video into the first frame
waitKey = 0


cap = cv2.VideoCapture("L2_clip2_16s.m4v")
while(True):
    ret, frame = cap.read()
    if ret:
        cv2.imshow("res",frame)

        # the first frame will be freezed and go through the draw_circle function
        if waitKey ==0:
            cv2.setMouseCallback("imshow",draw_circle)

        key = cv2.waitKey(waitKey)

        # when done taking point - click c to assign the value to waitkey and play the video normally
        if key == ord("c"):
            waitKey = 1

        elif key== ord('q'):
            break
    else:
        break
cv2.destroyAllWindows()

print (mouse)

Answer 1

过程如下：
-创建一个新窗口
-附加mouseCallback
-在此窗口绘制框架
-在窗口中单击时，draw_circle函数称为
-要处理框架，请使用框架变量
-要查看更改，请重新绘制框架

mouseCallback只需要附加一次。
注意：由于存在include ("true.html");循环，因此无法访问代码中的print (mouse)。

我已经修改了您的代码，以便可以使用。我只在修改代码的地方留下了注释。

while

保存第一帧的多个点的位置

1 个答案: