[英]python OpenCV Segmentation fault (core dumped)
I'm coding in python and using my webcam for now on testing. 我正在使用python进行编码,现在正在使用我的网络摄像头进行测试。
(ASUS KV55J | Ubuntu 14.04 | python 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2] | OpenCV version '2.4.8') (ASUS KV55J | Ubuntu 14.04 | python 2.7.6(默认,2015年6月22日,17:58:13)[GCC 4.8.2] | OpenCV 版本 '2.4.8')
I can successfully show the image from my webcam (very simple code) but when I try to set a mouse callback to when mouse passes over the image (also a very simple code) there are a big issue, a Segmentation fault after several frames (takes about 10/20seconds to fail but if i comment the callback it will work until "Ctrl-c" pressed). 我可以从网络摄像头成功显示图像(非常简单的代码),但是当我尝试将鼠标回调设置为鼠标经过图像时(也是非常简单的代码)时,存在一个大问题,几帧后出现分割错误(大约需要10/20秒才能失败,但是如果我评论回调,它将一直起作用,直到按下“ Ctrl-c”。
Does anyone know why it happens? 有谁知道为什么会这样吗?
I ran this and got this error (even if i dont move the mouse or press anything): 我跑了这个,并得到了这个错误(即使我不移动鼠标或按任何东西):
ncc@ncc-K55VJ:~/Desktop/testes_python/gui$ python a_teste_capture.py
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
Left mouse button pushed
Left mouse button pushed
Left mouse button pushed
Left mouse button pushed
Left mouse button pushed
Segmentation fault (core dumped)
The simplest code I had at the beggining was: 我在开始时最简单的代码是:
import cv, cv2
def click_and_take_frame(event, x, y, flags, param):
if event == cv2.EVENT_LBUTTONDOWN:
print 'Left mouse button pushed'
def main_function():
camera_device=cv2.VideoCapture(0)
frame_name="Segmentation fault (core dumped) TEST WINDOW"
cv2.namedWindow(frame_name, cv2.WINDOW_AUTOSIZE)
while 1:
(grabbed1, frame1) = camera_device.read()
frame1= cv2.cvtColor(frame1, cv2.CV_8U)
cv2.imshow(frame_name, frame1)
cv2.setMouseCallback(frame_name, click_and_take_frame)
key = cv2.waitKey(1) & 0xFF
cv2.destroyAllWindows() # Closes displayed windows
if __name__ == '__main__':
import sys
main_function()
According to my past experience this error occurs when you overload machine resources. 根据我过去的经验,当您过载计算机资源时,会发生此错误。
In your case there are two things which can do this 在您的情况下,有两件事可以做到这一点
while 1
is a infinite loop even if there is no frame. while 1
也是无限循环。 You can correct this by moving (grabbed1, frame1) = camera_device.read()
outside while loop and use while grabbed1:
which will only run the loop if frame is True
. (grabbed1, frame1) = camera_device.read()
并while grabbed1:
使用来纠正此while grabbed1:
仅当frame为True
时才运行循环。 You can read more about this here . cv2.setMouseCallback(frame_name, click_and_take_frame)
above while loop and you will stop wasting resources. cv2.setMouseCallback(frame_name, click_and_take_frame)
移动cv2.setMouseCallback(frame_name, click_and_take_frame)
浪费资源。
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