用OpenCV实现UVC摄像头的视频分屏。

Opencv

opencv里有很多视频图像的处理功能。

UVC

Usb 视频类，免驱动的。视频流格式有MJPG和YUY2。MJPG是RGB三色通道的。要对三通道进行分屏显示。

代码

import  cv2
import numpy as np
video = cv2.VideoCapture(0)
fps = video.get(cv2.CAP_PROP_FPS)
#print(fps)
size = (int(video.get(cv2.CAP_PROP_FRAME_WIDTH)), int(video.get(cv2.CAP_PROP_FRAME_HEIGHT)))
#print(size)

while True:
    ret, frame = video.read()
    channel0 = np.copy(frame)
    channel0[:,:,1] = 0
    channel0[:,:,2] = 0
    channel1 = np.copy(frame)
    channel1[:,:,0] = 0
    channel1[:,:,2] = 0
    channel2 = np.copy(frame)
    channel2[:,:,0] = 0#修改一列的值
    channel2[:,:,1] = 0

    vs1 = np.hstack([frame,channel0])  # 水平堆叠
    vs2 = np.hstack([channel1,channel2])  # 水平堆叠
    imgs = np.vstack((vs1, vs2))  # 竖直堆叠
    cv2.namedWindow("split screen",cv2.WINDOW_NORMAL)
    cv2.imshow("split screen", imgs)
    c = cv2.waitKey(1)#每隔1毫秒刷新一次
    if c == 27:#ESC
        break
video.release()
cv2.destroyAllWindows()

验证

视频流通道分屏的截屏

可以看到红色衣服在channel2红色通道里显示是清晰的。

后话

YUY2格式分屏。