运行 Opencv 的问题：“AttributeError: module 'cv2.dnn' has no attribute 'readNet'”答案

【问题标题】：Problems in running Opencv: "AttributeError: module 'cv2.dnn' has no attribute 'readNet' "运行 Opencv 的问题：“AttributeError: module 'cv2.dnn' has no attribute 'readNet'”
【发布时间】：2020-03-26 22:14:09
【问题描述】：

通过引用https://pysource.com/2019/06/27/yolo-object-detection-using-opencv-with-python/的代码，首次使用opencv进行图像中的对象检测

（P.S- 我是深度学习的新手）

问题：

当我在下面的代码行运行时：

net = cv2.dnn.readNet("yolov3.weights", "yolov3.cfg")

我得到下面提到的错误：

----> 5 net = cv2.dnn.readNet("yolov3.weights", "yolov3.cfg")

AttributeError: module 'cv2.dnn' has no attribute 'readNet'

解决这个问题：

1) 在对此进行了一些谷歌搜索之后，我尝试使用 conda update opencv-python 更新我的 opencv，并尝试使用 conda install -c conda-forge opencv 再次安装，但即使经过多次尝试，它仍然保持在 3.3.1 版本。

2) 然后我了解到我需要卸载所有以前版本的 opencv，但我找不到任何文件夹供 opencv 手动删除，conda uninstall opencv 正在运行几个小时，状态为 Finding shortest conflict path for python xxxxxx 并且仍在运行

3) 我正在考虑手动删除所有 opencv 文件，也可以找到 opencv 文件，但我不确定是否应该删除所有这些文件以重新安装 opencv。

4) 我需要建议是否可以安全地删除下面提到的文件，如果我删除它们并重新安装 opencv，那么它是否可以工作。请帮忙！！

opencv files:

 'C:\\Anaconda\\Library\\bin\\opencv_annotation.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_annotation.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_annotation.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_aruco331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_aruco331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_aruco331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_bgsegm331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_bgsegm331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_bgsegm331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_calib3d331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_calib3d331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_calib3d331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_ccalib331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_ccalib331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_ccalib331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_core331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_core331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_core331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_createsamples.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_createsamples.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_createsamples.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_datasets331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_datasets331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_datasets331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_dnn331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_dnn331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_dnn331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_dpm331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_dpm331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_dpm331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_face331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_face331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_face331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_features2d331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_features2d331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_features2d331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_ffmpeg331_64.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_flann331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_flann331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_flann331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_fuzzy331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_fuzzy331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_fuzzy331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_highgui331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_highgui331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_highgui331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_imgcodecs331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_imgcodecs331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_imgcodecs331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_imgproc331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_imgproc331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_imgproc331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_img_hash331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_img_hash331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_img_hash331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_interactive-calibration.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_interactive-calibration.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_interactive-calibration.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_line_descriptor331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_line_descriptor331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_line_descriptor331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_ml331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_ml331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_ml331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_objdetect331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_objdetect331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_objdetect331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_optflow331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_optflow331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_optflow331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_phase_unwrapping331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_phase_unwrapping331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_phase_unwrapping331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_photo331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_photo331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_photo331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_plot331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_plot331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_plot331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_reg331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_reg331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_reg331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_rgbd331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_rgbd331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_rgbd331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_saliency331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_saliency331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_saliency331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_shape331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_shape331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_shape331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_stereo331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_stereo331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_stereo331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_stitching331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_stitching331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_stitching331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_structured_light331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_structured_light331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_structured_light331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_superres331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_superres331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_superres331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_surface_matching331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_surface_matching331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_surface_matching331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_text331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_text331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_text331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_tracking331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_tracking331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_tracking331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_traincascade.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_traincascade.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_traincascade.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_version.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_version.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_version.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_video331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_video331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_video331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_videoio331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_videoio331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_videoio331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_videostab331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_videostab331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_videostab331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_visualisation.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_visualisation.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_visualisation.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_waldboost_detector.exe',
 'C:\\Anaconda\\Library\\bin\\opencv_waldboost_detector.exe.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_waldboost_detector.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_xfeatures2d331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_xfeatures2d331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_xfeatures2d331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_ximgproc331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_ximgproc331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_ximgproc331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_xobjdetect331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_xobjdetect331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_xobjdetect331.pdb',
 'C:\\Anaconda\\Library\\bin\\opencv_xphoto331.dll',
 'C:\\Anaconda\\Library\\bin\\opencv_xphoto331.dll.manifest',
 'C:\\Anaconda\\Library\\bin\\opencv_xphoto331.pdb']

【问题讨论】：

标签： python python-3.x opencv deep-learning

【解决方案1】：

我想知道如果你使用 Windows，我强烈建议你迁移到 Ubuntu，它是免费的，你可以将它安装在虚拟机上。以下是如何从源代码安装 OpenCV 的分步教程：https://www.learnopencv.com/install-opencv3-on-ubuntu/ 它工作正常，在此安装过程中我从未遇到任何问题。

【讨论】：

是的，我正在使用 Windows，我也在考虑迁移到 Ubuntu，但首先我现在需要解决这个问题。
以下是我解决这些问题的方法，如果有人也面临类似问题，那么这可能会有所帮助：cv2.dnn.readNet() 需要至少 opencv 3.4.2 版本才能工作。 1）首先将我的 conda 降级到 4.6 版本以解决问题“寻找 python xxxxxx 的最短冲突路径”，因为网上的其他人也抱怨相同并使用 4.6 版本 2）然后我删除了 opencv 3.3.1 版本并使用pip install opencv-python 来安装最新的opencv。