Python-OpenCV 处理视频（一）：输入输出_程序人生

Python-OpenCV 处理视频（一）：输入输出

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2023-07-31 00:44:36

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视频的处理和图片的处理类似，只不过视频处理需要连续处理一系列图片。

一般有两种视频源，一种是直接从硬盘加载视频，另一种是获取摄像头视频。

0x00. 本地读取视频

核心函数:

cv.CaptureFromFile()

代码示例：

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import cv2.cv as cv capture = cv.CaptureFromFile(\’myvideo.avi\’) nbFrames = int(cv.GetCaptureProperty(capture, cv.CV_CAP_PROP_FRAME_COUNT)) #CV_CAP_PROP_FRAME_WIDTH Width of the frames in the video stream#CV_CAP_PROP_FRAME_HEIGHT Height of the frames in the video stream fps = cv.GetCaptureProperty(capture, cv.CV_CAP_PROP_FPS) wait = int(1/fps * 1000/1) duration = (nbFrames * fps) / 1000 print \’Num. Frames = \’, nbFramesprint \’Frame Rate = \’, fps, \’fps\’print \’Duration = \’, duration, \’sec\’ for f in xrange( nbFrames ): frameImg = cv.QueryFrame(capture) print cv.GetCaptureProperty(capture, cv.CV_CAP_PROP_POS_FRAMES) cv.ShowImage(\”The Video\”, frameImg) cv.WaitKey(wait)

cv2

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import numpy as npimport cv2 cap = cv2.VideoCapture(\’vtest.avi\’) while(cap.isOpened()): ret, frame = cap.read() gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) cv2.imshow(\’frame\’,gray) if cv2.waitKey(1) & 0xFF == ord(\’q\’): break cap.release()cv2.destroyAllWindows()

0x01. 摄像头视频读取

核心函数：

cv.CaptureFromCAM()

示例代码：

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import cv2.cv as cv capture = cv.CaptureFromCAM(0) while True: frame = cv.QueryFrame(capture) cv.ShowImage(\”Webcam\”, frame) c = cv.WaitKey(1) if c == 27: #Esc on Windows break

cv2

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import numpy as npimport cv2 cap = cv2.VideoCapture/span>cv2 cap = cv2.VideoCapture=\”crayon-5812a37a11732965027020\” class=\”crayon-syntax crayon-theme-github crayon-font-monaco crayon-os-pc print-yes notranslate\” data-settings=\” minimize scroll-always\” style=\” margin-top: 12px; margin-bottom: 12px; font-size: 13px !important; line-height: 15px !important;\”>

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cv2

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0x01. 摄像头视频读取

核心函数：

cv.CaptureFromCAM()

示例代码：

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import cv2.cv as cv capture = cv.CaptureFromCAM(0) while True: frame = cv.QueryFrame(capture) cv.ShowImage(\”Webcam\”, frame) c = cv.WaitKey(1) if c == 27: #Esc on Windows break

cv2

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import numpy as npimport cv2 cap =

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Python-OpenCV 处理视频（一）：输入输出

0x00. 本地读取视频

0x01. 摄像头视频读取

0x01. 摄像头视频读取

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