Jan 30, 2022
diff --git a/03-Open-Camera/cv2_capture_live_video_from_camera.py b/03-Open-Camera/cv2_capture_live_video_from_camera.py
 import cv2
 import cv2 as cv

 # 1.打开摄像头
 capture =cv2.VideoCapture(2)
 capture =cv.VideoCapture(2)

 # 2.获取捕获的分辨率
 width, height = capture.get(3), capture.get(4)
 print(width, height)
 # 以原分辨率的一倍来捕获，
 # 参数1可以直接写数字，或者OpenCV符号表示
 capture.set(cv2.CAP_PROP_FRAME_WIDTH, width * 2)
 capture.set(cv2.CAP_PROP_FRAME_HEIGHT, height * 2)
 capture.set(cv.CAP_PROP_FRAME_WIDTH, width * 2)
 capture.set(cv.CAP_PROP_FRAME_HEIGHT, height * 2)

 while(True):
    # 获取一帧
    ret, frame = capture.read()
    # 将这帧转换为灰度图
    gray =cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    gray =cv.cvtColor(frame,cv.COLOR_BGR2GRAY)

 cv2.imshow('frame', gray)
    ifcv2.waitKey(1) == ord('q'):
 cv.imshow('frame', gray)
    ifcv.waitKey(1) == ord('q'):
        break
Original file line number	Diff line number	Diff line change
		@@ -1,22 +1,22 @@
		import cv2
		import cv2 as cv

		# 1.打开摄像头
		capture =cv2.VideoCapture(2)
		capture =cv.VideoCapture(2)

		# 2.获取捕获的分辨率
		width, height = capture.get(3), capture.get(4)
		print(width, height)
		# 以原分辨率的一倍来捕获，
		# 参数1可以直接写数字，或者OpenCV符号表示
		capture.set(cv2.CAP_PROP_FRAME_WIDTH, width * 2)
		capture.set(cv2.CAP_PROP_FRAME_HEIGHT, height * 2)
		capture.set(cv.CAP_PROP_FRAME_WIDTH, width * 2)
		capture.set(cv.CAP_PROP_FRAME_HEIGHT, height * 2)

		while(True):
		# 获取一帧
		ret, frame = capture.read()
		# 将这帧转换为灰度图
		gray =cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
		gray =cv.cvtColor(frame,cv.COLOR_BGR2GRAY)

		cv2.imshow('frame', gray)
		ifcv2.waitKey(1) == ord('q'):
		cv.imshow('frame', gray)
		ifcv.waitKey(1) == ord('q'):
		break