Opencv

[TOC] opencv opencv既可以从视频文件读取，也可以从视频设备上获取 install pip install opencv-python how to use import cv2 # video_capture = cv2.VideoCapture("/home/alex/1.mp4") # video_capture = cv.CaptureFromFile('rtsp://192.168.1.2:8080/out.h264') video_capture = cv2.VideoCapture(0) while True: _, frame = video_capture.read() cv2.imshow("image", frame) if cv2.waitKey(1) & 0xFF == ord('q'): break 可以从本地文件，视频设备，或者远程视频流中获取视频信号。 # 查看本地视频设备号 $ ls /dev/video* /dev/video0 常见实用示例 # 图片读写 def image_detector(self, imname, wait=0): # 读取图片 image = cv2.imread(imname) # 得到新的图片image result = self.detect(image) self.draw_result(image, result) # 显示图片 # cv2.imshow('Image', image) # cv2.waitKey(wait) # 保存图片 cv2.imwrite(imname.replace(".jpg", "_result.jpg"), image) # 写入视频 def camera_detector(self, cap, wait=10): # 获取 原视频的fps，fourcc编码，height，wieght等信息 fps = int(cap.get(cv2.CAP_PROP_FPS)) # fourcc = int(cap.get(cv2.CAP_PROP_FOURCC)) fourcc = cv2.VideoWriter_fourcc(*'MJPG') height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) weidth = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) print("fourcc: ", fourcc) # 创建新的写入writer videowriter = cv2.VideoWriter('test/test.avi', fourcc, fps, (weidth, height)) # 读取一帧图片 ret, frame = cap.read() while frame is not None: # 得到新的图片image result = self.detect(frame) self.draw_result(frame, result) # cv2.imshow('Camera', frame) # if cv2.waitKey(wait) & 0xFF == ord('q'): # break # 写入一帧图片 videowriter.write(frame) # 读取下一帧图片 ret, frame = cap.read() # 释放writer videowriter.release() # 调用 camera_detector cap = cv2.VideoCapture(video_read) detector.camera_detector(cap, wait=1) opencv mac error 正常情况下，在mac上面使用opencv是没有问题的，但是在Python子进程中使用opencv会发现子进程的代码会无厘头的没有结果。参考 这里 ，不要问我怎么知道的 /(ㄒoㄒ)/~~ ...