mp4实现背景的更新代码
时间: 2024-06-08 13:07:08 浏览: 9
这里提供一种基于OpenCV的方法来实现mp4视频背景的更新。
首先,导入必要的库:
```python
import cv2
import numpy as np
```
然后读取视频文件:
```python
cap = cv2.VideoCapture('input.mp4')
```
定义一个背景减法器:
```python
fgbg = cv2.createBackgroundSubtractorMOG2()
```
创建一个输出视频文件:
```python
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (640, 360))
```
循环读取每一帧,进行背景减法并写入输出视频:
```python
while cap.isOpened():
ret, frame = cap.read()
if not ret:
break
fgmask = fgbg.apply(frame)
fgmask[fgmask < 128] = 0
fgmask[fgmask >= 128] = 255
fgmask = cv2.medianBlur(fgmask, 5)
fgmask = cv2.dilate(fgmask, np.ones((5,5), np.uint8), iterations=1)
fgmask = cv2.erode(fgmask, np.ones((5,5), np.uint8), iterations=1)
frame[fgmask == 0] = [255, 255, 255]
out.write(frame)
```
最后,释放资源:
```python
cap.release()
out.release()
cv2.destroyAllWindows()
```
完整代码如下:
```python
import cv2
import numpy as np
cap = cv2.VideoCapture('input.mp4')
fgbg = cv2.createBackgroundSubtractorMOG2()
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (640, 360))
while cap.isOpened():
ret, frame = cap.read()
if not ret:
break
fgmask = fgbg.apply(frame)
fgmask[fgmask < 128] = 0
fgmask[fgmask >= 128] = 255
fgmask = cv2.medianBlur(fgmask, 5)
fgmask = cv2.dilate(fgmask, np.ones((5,5), np.uint8), iterations=1)
fgmask = cv2.erode(fgmask, np.ones((5,5), np.uint8), iterations=1)
frame[fgmask == 0] = [255, 255, 255]
out.write(frame)
cap.release()
out.release()
cv2.destroyAllWindows()
```
其中,使用了中值滤波、膨胀和腐蚀等操作来改善结果。您可以根据具体需求进行调整。
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