当我尝试使用 Python 重新打开 opencv 的 CameraCapture 时,我得到:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
libv4l2: error setting pixformat: Device or resource busy
libv4l1: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl VIDIOCSPICT
虽然我的应用程序使用 PyQt 和各种其他模块在更大的上下文中运行,但我能够隔离问题。因此,当我点击“r”(重新加载)时,捕捉对象被删除但我无法重新打开与相机的连接,因为它仍然处于事件状态:
#!/usr/bin/env python
from opencv.cv import *
from opencv.highgui import *
import sys
import time
import gc
cvNamedWindow("w1", CV_WINDOW_AUTOSIZE)
camera_index = 1
capture = cvCreateCameraCapture(camera_index)
def repeat():
global capture #declare as globals since we are assigning to them now
global camera_index
frame = cvQueryFrame(capture)
cvShowImage("w1", frame)
c = cvWaitKey(10)
if c == "q":
sys.exit(0)
if c == "r":
print 'reload'
#del frame
del capture
# pretty useless sleeping, garbage collecting, etc.
#gc.collect()
#import pdb; pdb.set_trace()
#print gc.get_objects()
#print gc.DEBUG_UNCOLLECTABLE
#time.sleep(2)
capture = cvCreateCameraCapture(camera_index)
if __name__ == "__main__":
while True:
repeat()
针对类似问题给出的提示对我不起作用: cant find ReleaseCapture in opencv while using python?和/或 OpenCV / Array should be CvMat or IplImage / Releasing a capture object
最佳答案
问题是您没有使用 OpenCV API 发布捕获组件。
你不应该做del capture
。正确的方法是:
cvReleaseCapture(capture)
关于python - 无法使用 Python/opencv : Device or resource busy 关闭/打开 CameraCapture,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9768312/