Python Forum

Output:
pip3 show opencv-python
Name: opencv-python
Version: 4.4.0.46
Summary: Wrapper package for OpenCV python bindings.
Home-page: https://github.com/skvark/opencv-python
Author: None
Author-email: None
License: MIT
Location: /home/brian/.local/lib/python3.8/site-packages
Requires: numpy

Error:
UbuntuUser@ubuntu:~/Desktop/PyQT$ pip3 show opencv-python
WARNING: Package(s) not found: opencv-python

sudo apt update
sudo apt install libopencv-dev python3-opencv

pip install opencv-python

Error:
QObject::moveToThread: Current thread (0x21735e0) is not the object's thread (0x28819c0).
Cannot move to target thread (0x21735e0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/mojito/.local/lib/python3.8/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, webgl.

Aborted (core dumped)

pip install opencv-python-headless

cv2.error: OpenCV(4.4.0) /tmp/pip-req-build-h2062vqd/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

UbuntuUser@ubuntu:~/Desktop/PyQT$ pip2 show pip

Command 'pip2' not found, did you mean:

  command 'pipx' from deb pipx (0.12.3.1-2ubuntu1)
  command 'nip2' from deb nip2 (8.7.0-1)
  command 'pip3' from deb python3-pip (20.0.2-5ubuntu1.1)

Try: sudo apt install <deb name>

UbuntuUser@ubuntu:~/Desktop/PyQT$ pip3 show pip
Name: pip
Version: 20.3.1
Summary: The PyPA recommended tool for installing Python packages.
Home-page: https://pip.pypa.io/
Author: The pip developers
Author-email: [email protected]
License: MIT
Location: /usr/local/lib/python3.8/dist-packages
Requires: 
Required-by: 

Output:
cv2.error: OpenCV(4.4.0) /tmp/pip-req-build-h2062vqd/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

Error:
MainThread     INFO     2020-12-20 04:05:11,775 TaurusRootLogger: Using PyQt5 (v5.15.2 with Qt 5.15.2 and Python 3.8.5)
Traceback (most recent call last):
  File "OrthoView_with_rasterio.py", line 678, in <module>
    window = OrthoView()
  File "OrthoView_with_rasterio.py", line 530, in __init__
    self.updateFrame()
  File "OrthoView_with_rasterio.py", line 570, in updateFrame
    self.getFrame()
  File "OrthoView_with_rasterio.py", line 540, in getFrame
    self.img = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
TypeError: Expected Ptr<cv::UMat> for argument 'src'

    def getFrame(self):                                                       # <---- line 533
        if isTest:
            fp = r'/home/UbuntuUser/Desktop/UAV_test.tif'                     # <----- here                 
            frame = rasterio.open(fp)                                         # <----- here
            # OpenCV uses BGR as its default colour order for images
            self.img = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)                 # <----- here
#            import pickle
#            with open(r"_images/sample-holder-test2.pickle", 'rb') as f:
#                try:
#                    packed = pickle.load(f, encoding='latin1')
#                except TypeError:
#                    packed = pickle.load(f)
#            unpacked = np.empty(list(packed.shape)+[3], dtype=np.uint8)
#            unpacked[:, :, 2] = (packed >> 16) & 0xff
#            unpacked[:, :, 1] = (packed >> 8) & 0xff
#            unpacked[:, :, 0] = packed & 0xff
#            self.img = unpacked

        else:
            frame = self.camera.read_attribute('Image').value

            # for monochrome frames:
#            self.img = cv2.normalize(
#                src=frame, dst=None, alpha=0, beta=255,
#                norm_type=cv2.NORM_MINMAX, dtype=cv2.CV_8UC1)
#            self.img = cv2.cvtColor(self.img, cv2.COLOR_GRAY2BGR)

            # for color frames:
            unpacked = np.empty(list(frame.shape)+[3], dtype=np.uint8)
            unpacked[:, :, 2] = (frame >> 16) & 0xff
            unpacked[:, :, 1] = (frame >> 8) & 0xff
            unpacked[:, :, 0] = frame & 0xff
            self.img = unpacked

Error:
cv2.error: OpenCV(4.4.0) /tmp/pip-req-build-h2062vqd/opencv/modules/core/src/alloc.cpp:73: error: (-4:Insufficient memory) Failed to allocate 24586133472 bytes in function 'OutOfMemoryError'