如何使用python捕获web_cam图像？

Question

如何使用python (raw python)捕获web_cam图像而不使用 任何类似cv2或pygame的库

it would be great if anybody know the trick how to capture image using only raw python. advance thank you so much.

我试着使用VideoCapture扩展，但对我来说效果不太好。但问题是它的分辨率有点慢，有时它会毫无理由地返回None

Answer 1

使用PyGame3.4

http://www.youtube.com/watch?v=SqmSpJfN7OE

http://www.lfd.uci.edu/~gohlke/pythonlibs/

您可以下载“pygame-1.9.2a0.win32-py3.4.exe”

import pygame
import pygame.camera
pygame.camera.init()
cam = pygame.camera.Camera(0,(640,480))
cam.start()
img = cam.get_image()
pygame.image.save(img,"filename.jpg")

Answer 2

您还需要：

pip install opencv-python

要节省图像，请按空格

试试这个：

import cv2

cam = cv2.VideoCapture(0)

cv2.namedWindow("test")

img_counter = 0

while True:
    ret, frame = cam.read()
    cv2.imshow("test", frame)
    if not ret:
        break
    k = cv2.waitKey(1)

    if k%256 == 27:
        # ESC pressed
        print("Escape hit, closing...")
        break
    elif k%256 == 32:
        # SPACE pressed
        img_name = "opencv_frame_{}.png".format(img_counter)
        cv2.imwrite(img_name, frame)
        print("{} written!".format(img_name))
        img_counter += 1

cam.release()

cv2.destroyAllWindows()