如何在 Python 中使用 OpenCV 拍摄网络摄像头照片

此代码打开 /dev/video0 并拍摄单张照片，之后关闭设备：

capture_webcam.py

import cv2

video_capture = cv2.VideoCapture(0)
# 检查成功
if not video_capture.isOpened():
    raise Exception("Could not open video device")
# 读取图片。成功时 ret === True
ret, frame = video_capture.read()
# 关闭设备
video_capture.release()

import cv2

video_capture = cv2.VideoCapture(0)
# 检查成功
if not video_capture.isOpened():
    raise Exception("Could not open video device")
# 读取图片。成功时 ret === True
ret, frame = video_capture.read()
# 关闭设备
video_capture.release()

你也可以使用 cv2.VideoCapture("/dev/video0")，但此方法依赖于平台。cv2.VideoCapture(0) 也将在非 Linux 平台上打开第一个视频设备。

在 Jupyter 中你可以使用以下代码显示图片

display_webcam_jupyter.py

import sys
from matplotlib import pyplot as plt

frameRGB = frame[:,:,::-1] # BGR => RGB
plt.imshow(frameRGB)

import sys
from matplotlib import pyplot as plt

frameRGB = frame[:,:,::-1] # BGR => RGB
plt.imshow(frameRGB)

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