cv2.aruco 和 plt.figure 导致 qt.qpa.plugin: 无法加载 'xcb'

Question

以下python代码：

import matplotlib.pyplot as plt
from cv2 import aruco

fig = plt.figure(figsize=(3,6))

导致以下错误：

QObject::moveToThread: Current thread (0x555e3d4d0a60) is not the object's thread (0x555e3db4a0f0).
Cannot move to target thread (0x555e3d4d0a60)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/r00tr4t/.local/lib/python3.9/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx.

Aborted (core dumped)

我测试了设置调试标志：

export QT_DEBUG_PLUGINS=1

完整的日志可以在这里找到http://ix.io/37V5

但是，如果您删除 cv2 部分一切正常，这是为什么呢？

import matplotlib.pyplot as plt
# from cv2 import aruco

fig = plt.figure(figsize=(3,6))

测试于：

• ArchLinux 5.9.10-arch1-1
• Python 3.9.3
• cv2.version.opencv_version '4.5.1.48'
• matplotlib.版本 '3.4.1'

编辑： 刚刚意识到我的代码有点简单，可以解释为 cv2.aruco 没有安装，但是，如果我实现这个代码：

import matplotlib.pyplot as plt
from cv2 import aruco

print(aruco.Dictionary_get(aruco.DICT_6X6_250))

fig = plt.figure(figsize=(3,6))

结果是<aruco_Dictionary 0x7f14d109db90> 即已安装。

Answer 1

尝试安装opencv-contrib-python

pip3 install opencv-contrib-python