在Python中从视频中提取图像

OpenCV 带有许多强大的视频编辑功能。在当前场景中，图像扫描、人脸识别等技术可以使用 OpenCV 完成。

图像分析是计算机视觉领域中一个非常常见的领域。它是从视频或图像中提取有意义的信息。 OpenCv 库可用于对视频执行多种操作。

需要的模块：

import cv2
import os

使用的函数：

VideoCapture(File_path) : Read the video(.mp4 format)

read() : Read data depending upon the type of object that calls

imwrite(filename, img[, params]) : Saves an image to a specified file.

下面是实现：

# Importing all necessary libraries
import cv2
import os
  
# Read the video from specified path
cam = cv2.VideoCapture("C:\\Users\\Admin\\PycharmProjects\\project_1\\openCV.mp4")
  
try:
      
    # creating a folder named data
    if not os.path.exists('data'):
        os.makedirs('data')
  
# if not created then raise error
except OSError:
    print ('Error: Creating directory of data')
  
# frame
currentframe = 0
  
while(True):
      
    # reading from frame
    ret,frame = cam.read()
  
    if ret:
        # if video is still left continue creating images
        name = './data/frame' + str(currentframe) + '.jpg'
        print ('Creating...' + name)
  
        # writing the extracted images
        cv2.imwrite(name, frame)
  
        # increasing counter so that it will
        # show how many frames are created
        currentframe += 1
    else:
        break
  
# Release all space and windows once done
cam.release()
cv2.destroyAllWindows()

输出：

所有提取的图像都将保存在系统上名为“data”的文件夹中。