Question

我正在尝试做框架差异，这是我的代码

import numpy as np
import cv2

current_frame =cv2.VideoCapture(0)


previous_frame=current_frame


while(current_frame.isOpened()):


current_frame_gray = cv2.cvtColor(current_frame, cv2.COLOR_BGR2GRAY)
previous_frame_gray= cv2.cvtColor(previous_frame, cv2.COLOR_BGR2GRAY)

frame_diff=cv2.absdiff(current_frame_gray,previous_frame_gray)


cv2.imshow('frame diff ',frame_diff)


cv2.waitKey(1)

current_frame.copyto(previous_frame)
ret, current_frame = current_frame.read()


current_frame.release()
cv2.destroyAllWindows()

我的问题是我尝试创建空帧以保存current_frame

中的第一帧

previous_frame=np.zeros(current_frame.shape,dtype=current_frame.dtype)

但我认为这是不正确的，然后我试图像这样传递current_frame：

previous_frame=current_frame

现在我收到了这个错误：

current_frame_gray = cv2.cvtColor（current_frame，cv2.COLOR_BGR2GRAY） TypeError：src不是一个numpy数组，也不是标量

那我该怎么做呢？

感谢您的帮助

Answer 1

您已混合VideoCapture对象和框架。

我还对帧复制和等待键做了一些小改动。

import cv2

cap = cv2.VideoCapture(0)
ret, current_frame = cap.read()
previous_frame = current_frame

while(cap.isOpened()):
    current_frame_gray = cv2.cvtColor(current_frame, cv2.COLOR_BGR2GRAY)
    previous_frame_gray = cv2.cvtColor(previous_frame, cv2.COLOR_BGR2GRAY)    

    frame_diff = cv2.absdiff(current_frame_gray,previous_frame_gray)

    cv2.imshow('frame diff ',frame_diff)      
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

    previous_frame = current_frame.copy()
    ret, current_frame = cap.read()

cap.release()
cv2.destroyAllWindows()

使用python的帧差异

1 个答案: