OpenCV 的基本操作 —— 通过案例学习图像处理及计算机视觉开发（1）

拿我那八倍镜来

wang540375563 发表于 2020-2-7 19:29
为什么下面没有显示没有

你要把读取的内容赋值给变量再显示，就好像有一堆书，我让你读本书完了告诉我讲的啥，那你得把内容记住然后跟书名关联起来。我问你读了没你说读了，我不问是哪本书你也没记住书名那怎么讲出来呢

旺旺同学爱编程

wang540375563 发表于 2020-2-7 19:29
为什么下面没有显示没有

cv2.imread()只是读取这张图的信息，并没有什么显眼的结果，若你想展示这张图使用cv2.imshow()

幕有前

123驾驭甲鱼正邦

人过无痕

为什么我在cmd 中下载这个opencv 会变成这样
Microsoft Windows [版本 10.0.26100.6584]
(c) Microsoft Corporation。保留所有权利。

C:\Users\Doraemon>python -m pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting opencv-python
  Downloading https://pypi.tuna.tsinghua.edu.c ... -abi3-win_amd64.whl (39.0 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 39.0/39.0 MB 24.5 MB/s  0:00:01
Collecting numpy<2.3.0,>=2 (from opencv-python)
  Downloading https://pypi.tuna.tsinghua.edu.c ... /numpy-2.2.6.tar.gz (20.3 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 20.3/20.3 MB 24.2 MB/s  0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... error
  error: subprocess-exited-with-error

  × Preparing metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [21 lines of output]
      + C:\Users\Doraemon\AppData\Local\Programs\Python\Python314\python.exe C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba\vendored-meson\meson\meson.py setup C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba\.mesonpy-cv6pugrl -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md --native-file=C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba\.mesonpy-cv6pugrl\meson-python-native-file.ini
      The Meson build system
      Version: 1.5.2
      Source dir: C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba
      Build dir: C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba\.mesonpy-cv6pugrl
      Build type: native build
      Project name: NumPy
      Project version: 2.2.6
      WARNING: Failed to activate VS environment: Could not find C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe

      ..\meson.build:1:0: ERROR: Unknown compiler(s): [['icl'], ['cl'], ['cc'], ['gcc'], ['clang'], ['clang-cl'], ['pgcc']]
      The following exception(s) were encountered:
      Running `icl ""` gave "[WinError 2] 系统找不到指定的文件。"
      Running `cl /?` gave "[WinError 2] 系统找不到指定的文件。"
      Running `cc --version` gave "[WinError 2] 系统找不到指定的文件。"
      Running `gcc --version` gave "[WinError 2] 系统找不到指定的文件。"
      Running `clang --version` gave "[WinError 2] 系统找不到指定的文件。"
      Running `clang-cl /?` gave "[WinError 2] 系统找不到指定的文件。"
      Running `pgcc --version` gave "[WinError 2] 系统找不到指定的文件。"

      A full log can be found at C:\Users\Doraemon\AppData\Local\Temp\pip-install-bwb3wnxv\numpy_102e17144c4a47e5abd7969277d079ba\.mesonpy-cv6pugrl\meson-logs\meson-log.txt
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

C:\Users\Doraemon>python -m pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple

汪毅弘

萧人也 发表于 2020-1-14 22:02
是的

我的没有中文,为什么也是None