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Is it possible to install OpenCV on Raspberry Pi?
Compiling OpenCV from source may run into swap file limits. Check the value of the CONF_SWAPFILE in the file /etc/dphys-swapfile. You may want to increase it because the default Raspbian Buster setting (as before) is 100. It can be difficult installing opencv on raspberry pi.
Can you upgrade Raspberry Pi 3 to Raspbian Stretch?
If you don’t already have the Raspbian Stretch OS, you’ll need to upgrade your OS to take advantage of Raspbian Stretch’s new features. To upgrade your Raspberry Pi 3 to Raspbian Stretch, you may download it here and follow these upgrade instructions (or these for the NOOBS route which is recommended for beginners).
Which is the default repository for OpenCV in Raspbian?
OpenCV is part of the default raspbian repository. Just installing it with apt works out of the box. How to do it you can look at Pre-Built openCV on raspbian Buster. If the build process doesn’t throw an error and keeps the CPU busy, I’d assume it’s still working.
How long does it take to download Raspbian Stretch?
The former instructions take approximately 10 minutes to download via a torrent client and about 10 minutes to flash the SD card at which point you can power up and proceed to the next section. Note: If you are upgrading your Raspberry Pi 3 from Raspbian Jessie to Raspbian Stretch, there is the potential for problems.
Installing OpenCV is pretty much straightforward process, it just take a lot of time. mitchtech is a good source but it is for old Raspbian not for the new ones. I googled a lot for the last few months to make a cheat sheet, and I made one.
Can you install OpenCV on Python 2 not 3?
I recommend you install OpenCV for Python 2 not 3, and I also recommend that you stick to the cheat sheet especially in step 12. Sometime when you use all the cores the process fails to continue. I also recommend you use a 2A, 5V Adapter.
Is there a version 4 of Raspberry Pi?
Note that from the link a version 4 is available. You will have to solve a lot of dependencies by yourself by installing apt packages. Raspberry3 model B should have enough memory to compile it (it requires a lot of time) (RPi2 maybe, RPi1 I do not think so) but it’s not garanteed.