我正在尝试在树莓派中在屏幕上显示网络摄像头捕获。它显示第一帧没有问题,但下一帧显示为灰色帧。
这在Windows上有效,但在树莓上无效。
import cv2 as cv
cap = cv.VideoCapture(0)
ret, frame = cap.read()
cv.imshow('frame0',frame)
while True:
ret, frame = cap.read()
cv.imshow('frame',frame)
if cv.waitKey(1) == ord('q'):
break
cap.release()
cv.destroyAllWindows()
答案 0 :(得分:0)
首先安装Picamera
模块,然后尝试:
# import the necessary packages
from picamera.array import PiRGBArray
from picamera import PiCamera
import time
import cv2
# initialize the camera and grab a reference to the raw camera capture
camera = PiCamera()
camera.resolution = (640, 480)
camera.framerate = 32
rawCapture = PiRGBArray(camera, size=(640, 480))
# allow the camera to warmup
time.sleep(0.1)
# capture frames from the camera
for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
# grab the raw NumPy array representing the image, then initialize the timestamp
# and occupied/unoccupied text
image = frame.array
# show the frame
cv2.imshow("Frame", image)
key = cv2.waitKey(1) & 0xFF
# clear the stream in preparation for the next frame
rawCapture.truncate(0)
# if the `q` key was pressed, break from the loop
if key == ord("q"):
break
来源:https://www.pyimagesearch.com/2015/03/30/accessing-the-raspberry-pi-camera-with-opencv-and-python/