Python中的各种报错-opencv-python

天边一坨浮云

已于 2025-02-13 17:49:12 修改

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分类专栏： # Python 文章标签： opencv python

于 2023-06-10 17:13:37 首次发布

本文链接：https://blog.youkuaiyun.com/ytomc/article/details/131144256

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文章讲述了在安装和使用OpenCV-Python过程中遇到的几个典型问题，包括安装失败（涉及CMake和VisualStudio版本）、imshow函数显示异常、imwrite无法找到图片扩展名、VideoWriter保存视频异常以及输入图像深度不支持的问题，并提供了相应的解决方案，如检查平台兼容性、添加图片扩展名、调整图片和VideoWriter的尺寸匹配等。

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安装报错

error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

error: (-2) could not find a writer for the specified extension in function cv::imwrite_

opencv-python用VideoWriter保存视频只有几KB

Unsupported depth of input image

opencv imshow函数显示图片，窗口在转圈并且一直是灰色图像

安装报错

报错信息：

# 这只是报错信息的片段
Building wheel for opencv-contrib-python (PEP 517) ... error
  ERROR: Complete output from command 'D:\anzhuanglujing\Anaconda\python.exe' 'D:\anzhuanglujing\Anaconda\lib\site
-packages\pip\_vendor\pep517\_in_process.py' build_wheel 'C:\Users\Administrator\AppData\Local\Temp\tmpjqvqd9_8':
  ERROR: Not searching for unused variables given on the command line.
  CMake Error at CMakeLists.txt:2 (PROJECT):
    Generator
  
      Ninja
  
    does not support platform specification, but platform
  
      x64
  
    was specified.
  
  
  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Administrator/AppData/Local/Temp/pip-install-bc_r227f/opencv-contrib-python/_cmake_test_compi
le/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  CMake Error at CMakeLists.txt:2 (PROJECT):
    Generator
  
      Visual Studio 17 2022
  
    could not find any instance of Visual Studio.

升级pip版本，命令如下：python -m pip install --upgrade pip

然后再安装

报错信息：

  Please check the install target is valid and see CMake's output for more information.
  ----------------------------------------
  ERROR: Failed building wheel for opencv-python
Failed to build opencv-python
ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects

我是python 3.6，不能装最新版本的opencv，可以装低版本，比如4.5.3.56

error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

查了网上原因有很多，我直接加了try except解决。

if frame is not None:
            try:
                cv2.imshow(window_name, frame)
                p.send(frame)
            except:
                pass