1 import cv2
 2 
 3 # 創(chuàng)建一個(gè)視屏捕獲對(duì)象
 4 videoCapture = cv2.VideoCapture('AVI.avi')
 5 
 6 # 獲取視頻的屬性值，cv2.CAP_PROP_FPS獲取視頻幀率
 7 fps = videoCapture.get(cv2.CAP_PROP_FPS)
 8 
 9 # cv2.CAP_PROP_FRAME_WIDTH/HEIGHT 返回float類型 獲取視頻幀的寬高
10 size = int(videoCapture.get(cv2.CAP_PROP_FRAME_WIDTH)), \
11        int(videoCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
12 
13 '''
14 創(chuàng)建一個(gè)寫(xiě)入對(duì)象，將幀寫(xiě)入輸出的視頻
15 cv2.VideoWriter_fourcc()函數(shù)指定編碼器為 I420
16 fps 和 size 指定輸出的幀率和尺寸
17 '''
18 videoWrite = cv2.VideoWriter('Out.avi',
19                              cv2.VideoWriter_fourcc('I', '4', '2', '0'),
20                              fps, size
21                              )
22 
23 '''
24 對(duì)捕獲到的視頻對(duì)象進(jìn)行讀取幀，success表示是否成功讀取一幀，frame表示當(dāng)前幀。
25 循環(huán)讀取寫(xiě)入輸出視頻。
26 '''
27 success, frame = videoCapture.read()
28 while success:
29        videoWrite.write(frame)
30        success, frame = videoCapture.read()

 1 import cv2
 2 
 3 cameraCapture = cv2.VideoCapture(0)
 4 
 5 fps = 30
 6 
 7 size = int(cameraCapture.get(cv2.CAP_PROP_FRAME_WIDTH)), \
 8         int(cameraCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
 9 
10 videoWriter = cv2.VideoWriter(
11     'OutVideo_GRAB.avi',
12     cv2.VideoWriter_fourcc('I', '4', '2', '0'),
13     fps,
14     size
15 )
16 
17 success, frame = cameraCapture.read()
18 
19 numFramesRemaining = 10 * fps
20 while success and numFramesRemaining > 0:
21     videoWriter.write(frame)
22     success, frame = cameraCapture.read()
23     numFramesRemaining -= 1

1 import cv2
2 
3 img = cv2.imread('CopyPic.png')
4 cv2.imshow('', img)
5 cv2.waitKey()
6 cv2.destroyAllWindows()

 1 import cv2
 2 
 3 # 檢測(cè)窗口是否被點(diǎn)擊
 4 clicked = False
 5 
 6 
 7 # 定義鼠標(biāo)事件處理函數(shù)
 8 def onMouse(event: int, x, y, flags, param):
 9     global clicked
10     if event == cv2.EVENT_LBUTTONUP:
11         clicked = True
12 
13 
14 # 創(chuàng)建一個(gè)視頻對(duì)象
15 cameraCapture = cv2.VideoCapture(0)
16 # 定義窗口命
17 cv2.namedWindow('Camera')
18 # 將鼠標(biāo)回調(diào)函數(shù)，將鼠標(biāo)事件處理函數(shù)和窗口關(guān)聯(lián)起來(lái)
19 cv2.setMouseCallback('Camera', onMouse)
20 
21 print('Showing camera feed. Click window or press any key to stop.')
22 # 獲取當(dāng)前時(shí)間的攝像頭幀
23 success, frame = cameraCapture.read()
24 
25 # 循環(huán)獲取當(dāng)前時(shí)間的攝像頭幀，當(dāng)按下任意按鍵 or 點(diǎn)擊鼠標(biāo)時(shí)則停止顯示
26 while success and cv2.waitKey(1) == -1 and not clicked:
27     cv2.imshow('Camera', frame)
28     success, frame = cameraCapture.read()
29 
30 # 關(guān)閉窗口
31 cv2.destroyAllWindows()
32 
33 # 釋放攝像頭資源
34 cameraCapture.release()

 1 import cv2
 2 
 3 for item in range(10):
 4     # 創(chuàng)建一個(gè)object
 5     camera = cv2.VideoCapture(item)
 6 
 7     # 查詢此攝像頭是否能打開(kāi)，如果不能則跳過(guò)，并輸出一條 Error Message
 8     if not camera.isOpened():
 9         print(f"Can\'t open camera {item}")
10         continue
11 
12     # 讀取攝像頭幀率
13     while True:
14         success, frame = camera.read()
15         # 當(dāng)攝像頭幀讀取失敗則跳過(guò)
16         if not success:
17             break
18 
19         cv2.imshow(f'Camera device number: {item}', frame)
20 
21         # 等待1毫秒，檢查用戶是否有鍵盤(pán)輸入‘q’
22         if cv2.waitKey(1) == ord('q'):
23             break
24 
25     camera.release()
26     cv2.destroyAllWindows()