I believe the issue has to do with the new Raspberry Pi OS (Bullseye) and the new camera library (Libcamera) that is now the default.
I’m investigating the current Open-CV compatibility with this new operating system. Open-CV will be updated to work with this new system soon but I do not think so yet. This is most likely why the Error popping up on your system has to do with being | can’t open the camera by index | as that system has changed. Updates are coming out fast and all the issues that arise will be ironed out soon.
You can easily revert back to the previous Raspberry Pi OS (Buster), the official download link to get this image that definitely works with Open-CV can be found here. This will mean starting the process again (sorry ).
Firstly before starting from scratch though, check for me whether | raspistill -t 0 | when entered into the Terminal opens a preview window of what the camera sees, if so you have the Buster image and something else is going on.
Once I check the set-up for myself here I will update the Open-CV guides with my findings. [I have now Updated all Open-CV articles]
Hi Jignesh, pip is for python version less than 3. I see the traceback says python 3.7, which would require pip3 install command. > ## PIP Vs PIP3 What’s the Difference?
PIP
PIP3
PIP is a soft link for a particular installer.
pip3 is an updated version of pip which is used basically for python 3+.
The system will use one of your Python versions depending on what exactly is first in the system PATH variable.
When you run PIP3 , you can be sure that the module will be installed in Python 3 .
if I use pip, the package will be installed for the python version that I installed last on my computer. That would be 3.9 for my case. So using pip and using pip3.9 will produce the same result for me.
If I use pip3, the package will only be installed for python3. It won’t be available for 2.7 or 2.9.
Apart from what Tim said about the incompatibility of the RPi cameras with Bullseye, give a try with pip3 to see if some of the error messages disappear.
Edit: Forgot to add that, in Bullseye, the default for the command “python” is Python version 3. So all packages have to be python3. Or try running with “python2” to run the scripts instead of just “python,” without updating anything and see if the errors disappear.
If | raspistill - t 0 | doesn’t work straight away when using Buster OS that is properly weird. If you can’t get images/video feed out of the camera then I reckon there is some hardware issue going on. Double-check that CSI ribbon cable. Since your using Buster OS run through this guide - Raspberry Pi High Quality Camera – First Pictures and Videos - Tutorial Australia.
Most important step right now is to get your camera working,
Kind regards
Tim
hi tim
I did all your steps but got this error when I ran the python facial_req.py
I am using a raspberry pi 3+ and the same camera your using in the video
the error I got was :
[INFO] loading encodings + face detector...
[ WARN:0] global /tmp/pip-wheel-j62hpwu1/opencv-python_19cf39855c924932a2df50dd2b502cd2/opencv/modules/videoio/src/cap_v4l.cpp (890) open VIDEOIO(V4L2:/dev/video2): can't open camera by index
Traceback (most recent call last):
File "/home/pi/facial_recognition/facial_req.py", line 38, in <module>
frame = imutils.resize(frame, width=300)
File "/home/pi/.local/lib/python3.9/site-packages/imutils/convenience.py", line 69, in resize
(h, w) = image.shape[:2]
AttributeError: 'NoneType' object has no attribute 'shape'
Hey mate, looks like a classic problem of not being able to open the Pi Camera by Index. So now we just need to identify what is doing that. Start off by double-checking the ribbon cable between your Rasberry Pi and the Camera.
If that ribbon has been connected securely and the right way, type the following into your Raspberry Pi terminal. As soon as you enter this it should create a window with a live preview of what the camera is seeing.
raspistill -t 0
If that runs into errors, double-check your Raspberry Pi Configuration Settings, jump to the interfaces Tab and make sure that the camera has been enabled. Reboot to lock-in that change and retry that above line. Also type and enter for me the below line into your terminal (if that one works you will need to re-flash your card with ‘Buster’ OS as the ‘Bullseye’ OS that works with that below line won’t work with OpenCV just yet).
CMake Warning:
No source or binary directory provided. Both will be assumed to be the
same as the current working directory, but note that this warning will
become a fatal error in future CMake releases.
CMake Error: The source directory “/home/pi” does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
pi@raspberrypi:~ $
How would you suggest I fix this error ?
Thank you
James
To run the | cmake | command it is important to be in the correct directory. Because your CMake Error: The source directory “home/pi” does not appear to contain CMakeLists.txt tells me your targetting the wrong directory. Running the below two lines will fix that for you.
mkdir ~/opencv/build
cd ~/opencv/build
If that doesn’t fix the problem for you I’ll work through it with you until we get the system up and running for you
Error while running facial_reg.py
[ WARN:0] global /tmp/pip-wheel-2c57qphc/opencv-python_86774b87799240fbaa4c11c089d08cc3/opencv/modules/videoio/src/cap_v4l.cpp (890) open VIDEOIO(V4L2:/dev/video2): can’t open camera by index
Traceback (most recent call last):
File “facial_req.py”, line 38, in
frame = imutils.resize(frame, width=500)
File “/home/pi/.local/lib/python3.7/site-packages/imutils/convenience.py”, line 69, in resize
(h, w) = image.shape[:2]
AttributeError: ‘NoneType’ object has no attribute ‘shape’
and the camera is working fine and did all solution
Ah this is a classic can’t open camera by index problem. Just to double check are you using a Raspberry Pi Camera or a USB Webcamera. Also does a live feed come up on your screen when you type and enter the below into your terminal?
raspivid -t 0
If not double-check your connections and that the camera has been enabled in the Raspberry Pi Configuration menu.
Note - If a Raspberry Pi Camera is attached via the CSI port do the following to the | facial_req.py | code by right-clicking it and opening it with Thonny. Edit the following lines. Delete this line |vs = VideoStream(src=0).start() | and uncomment this line |vs = VideoStream(usePiCamera=True).start()t |. The downloadable file that I have at the bottom of the article has this done already. That may be the issue. Hit me back if you still need a hand.
This concerns the setup/build portion of the Facial Recognition tutorial. I’m stuck on the "cmake -D CMAKE_BUILD_TYPE=RELEASE " line.
I have changed my directory to the /home/pi/opencv/build directory, but the directory is empty. I’m getting the “…does not seem to contain CMakeLists.txt.” error.
I’ve reviewed all of my steps and I don’t see any errors in my entries. This is a new 4B with legacy Buster.
).
