Python-OpenCV的帧类型

weixin_436388732024-03-09 11:18

python-opencv在图像处理中很重要，那么用OpenCV读摄像头或视频，取出的帧是一种什么样的数据呢？

实验代码如下:

python 复制代码

import cv2

cap = cv2.VideoCapture(r'I:\test.mp4')

if cap.isOpened():
    ret, frame = cap.read()
    print(frame)

cap.release()

运行结果:

bash 复制代码

[[[2 2 2]
  [2 2 2]
  [1 1 1]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]

 [[2 2 2]
  [2 2 2]
  [1 1 1]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]

 [[1 1 1]
  [1 1 1]
  [1 1 1]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]

 ...

 [[0 0 0]
  [0 0 0]
  [0 0 0]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]
  ...
  [0 0 0]
  [0 0 0]
  [0 0 0]]]

Process finished with exit code 0

检查一下它属于什么类型:

python 复制代码

import cv2

cap = cv2.VideoCapture(r'I:\test.mp4')

if cap.isOpened():
    ret, frame = cap.read()
    print(type(frame))

cap.release()

运行的结果:

python 复制代码

<class 'numpy.ndarray'>

Process finished with exit code 0

很显然，帧取出来后，在Python中以多维数组的形式呈现。类型是numpy.ndarray。