[英]OpenCV wont' capture from MacBook Pro iSight
Since a couple of days I can't open my iSight camera from inside an opencv application any more. 几天以来,我再也无法从opencv应用程序内部打开iSight摄像机了。
cap = cv2.VideoCapture(0)
returns, and cap.isOpened()
returns true
. cap = cv2.VideoCapture(0)
返回,并且cap.isOpened()
返回true
。 However, cap.grab()
just returns false
. 但是,
cap.grab()
仅返回false
。 Any ideas? 有任何想法吗?
Example Code: 示例代码:
import cv2
cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)
rval = True
while rval:
rval, frame = vc.read()
cv2.imshow("preview", frame)
key = cv2.waitKey(20)
if key == 27: # exit on ESC
break
This is how I got the camera working for your code (on OSX 10.6): 这是我让相机为您的代码工作的方式(在OSX 10.6上):
import cv2
cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)
rval, frame = vc.read()
while True:
if frame is not None:
cv2.imshow("preview", frame)
rval, frame = vc.read()
if cv2.waitKey(1) & 0xFF == ord('q'):
break
I had a segmentation fault after I grab an image. 抓取图像后出现分割错误。 It turned out that I used
cv2.destroyAllWindows()
before cap.release()
. 事实证明,我在
cv2.destroyAllWindows()
之前使用了cap.release()
。 Below I show working code. 下面我显示了工作代码。
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
#do some ops
cap.release()
cv2.imshow("output", output)
cv2.waitKey(0)
cv2.destroyAllWindows()
This code works on El Captain. 此代码适用于El Captain。
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