cv2.imshow() 在线程中调用时不会弹出窗口。 docker中出现了python3的图标，但没有窗口，没有绘图。另外，我需要半双工通信的功能，因此我不能只删除线程。如何正确显示螺纹内的图片？任何回应表示赞赏。
背景：MacOS Catalina，python==3.5，opencv==3.4.2
import cv2
import threading
def run():
# start the camera
video_reader = cv2.VideoCapture(0)
while True:
# collect image
ret_val, image = video_reader.read()
cv2.imshow('image', image)
if cv2.waitKey(1) == 27:
break # esc to quit
t = threading.Thread(target=run, name="run")
t.start()
一些可能有帮助的警告消息：
python3[86286:1964642] WARNING: NSWindow drag regions should only be invalidated on the Main Thread! This will throw an exception in the future. Called from (
0 AppKit 0x00007fff2fc177f0 -[NSWindow(NSWindow_Theme) _postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 371
1 AppKit 0x00007fff2fc14ce1 -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 1416
2 AppKit 0x00007fff2fc14753 -[NSWindow initWithContentRect:styleMask:backing:defer:] + 42
3 AppKit 0x00007fff2fea8368 -[NSWindow initWithContentRect:styleMask:backing:defer:screen:] + 52
4 libopencv_highgui.3.4.2.dylib 0x000000010327bee7 cvNamedWindow + 727
5 libopencv_highgui.3.4.2.dylib 0x000000010327b7a3 cvShowImage + 195
6 libopencv_highgui.3.4.2.dylib 0x000000010327860d _ZN2cv6imshowERKNS_6StringERKNS_11_InputArrayE + 477
7 cv2.cpython-35m-darwin.so 0x00000001014f8393 _ZL18pyopencv_cv_imshowP7_objectS0_S0_ + 387
8 python3 0x0000000100ca759f PyCFunction_Call + 127
9 python3 0x0000000100d6eec7 PyEval_EvalFrameEx + 18583
10 python3 0x0000000100d68faf _PyEval_EvalCodeWithName + 335
11 python3 0x0000000100c746aa function_call + 106
12 python3 0x0000000100c30b35 PyObject_Call + 69
13 python3 0x0000000100d6fc9b PyEval_EvalFrameEx + 22123
14 python3 0x0000000100d6efb8 PyEval_EvalFrameEx + 18824
15 python3 0x0000000100d6efb8 PyEval_EvalFrameEx + 18824
16 python3 0x0000000100d68faf _PyEval_EvalCodeWithName + 335
17 python3 0x0000000100c746aa function_call + 106
18 python3 0x0000000100c30b35 PyObject_Call + 69
19 python3 0x0000000100c53694 method_call + 148
20 python3 0x0000000100c30b35 PyObject_Call + 69
21 python3 0x0000000100d77bf4 PyEval_CallObjectWithKeywords + 68
22 python3 0x0000000100de472a t_bootstrap + 122
23 libsystem_pthread.dylib 0x00007fff69e8cd76 _pthread_start + 125
24 libsystem_pthread.dylib 0x00007fff69e895d7 thread_start + 15
)
2019-10-14 15:20:27.485 python3[86286:1964642] WARNING: nextEventMatchingMask should only be called from the Main Thread! This will throw an exception in the future.
Apple 只允许在 macOS 和 iOS 的主线程上使用本机 UI 功能。
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