I finally got it.
You need to follow the bcm2835 installation instructions, then follow these instructions to download the mlx90640 library
https://www.raspberrypi.org/forums/viewtopic.php?t=234554 and then, run the programs with "sudo examples/fbuf per example.
The downloading of the mlx90640 library wasn't in the Git Hub instructions and that's why it ...
Piotr Kula's answer seems to be on the right track but is outdated for Raspberry stretch.
There are updated instructions for uv4l on Raspberry stretch at
# switch to superuser mode
# add the repository key for uv4l
curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add
It should be possilbe to send video over radio or bluetooth if for some reason you don't want to use wifi for some reason. Also do you mean no Internet access or not using Wi-Fi because those two are very different.
There is nothing specific to a Raspberry in the question, but you can add the values of all pixels in the image, and if the result is below your threshold, it is considered too dark. Usually, a black pixel is represented by the value zero.
Probably a bit late, but i had the same issue and it was impossible to find information, maybe this i'll help someone.
My Camera is almost exactly like the one in the photo, and it doesn't have a "sunny" connector.
What fixed it for me was just unscrewing it completely, pressing lightly on the sides of the sensor module, and reattaching everything, except ...
In the UK at the moment:
PiHut and Pimironi both have stock.
RS components have just shy of 13K ready to go.
Farnell are out until september.
Pi supply are also out.
I was to see a couple out of stock which may suggest a delay somewhere?
I'm guessing postage costs to India would be significant?
From my experience , for raspivid option:
--preview, -p Preview window settings <'x,y,w,h'>
You can use this for your raspivid window position on the screen. Assume raspivid on the left on your screen, then you can open vlc in a new window and put it on the right of the screen.
If you want a foreground window, you can use OPENCV highgui and put ...