Waves on raspberrypi camera feed, Ground loops? electrical interference?

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I run a video recorder in a vehicle built on Jetson Nano. The vehicle has a 24V power supply. I power the video recorder with an automotive-grade 24V to 5V converter.

The Jetson nano is connected with a Raspberrypi Camera with a Flat ribbon cable. When I record video, I get a wave-like noise on the video feed at random times. And at times, it appears in a 1 second interval(only from what I see, no measurements/tests done) . This is the connection diagram and voltage differences between nodes.

The software guys working on the camera driver say this could be electrical interference. We have a similar setup in our lab environment and we are not able to reproduce the noise. We doubted the power supply, vibration, 4G LTE interference, GPS interference. The cable used to connect the camera with the board sometimes touches the HDMI/display ports of the Jetson Nano board.

Sample video of different types of noises:
https://drive.google.com/open?id=19lQeAW7Y9ccW_fLRxOqREwdDaNztlT2k
https://drive.google.com/open?id=1DgGcmsLVdD-De1J9Uszi-gZXu5jobSDi
https://drive.google.com/open?id=1hQPzlArrXruaj1-L3CDXnThZAlqO4wOx

Sometimes the lines are coloured and some times the are white

Is this caused by ground loops?

What could be different from a vehicle and the lab environment, how do I ensure the grounding is good in the vehicle. And how do I test and ensure if this is due to electrical interference? Or any other interference?

This is the convertor used, the sellers say this is non-isolated buck converter and there are isolated ones which are used in radio related devices for less noise, does this have anything to do?

Hi, if no such interfere with other power supply as you got in lab, then it should be the DC-DC problem. You can try other DC-DC, or adding a big capacitor between ‘+’ and ‘-’ of output of DC-DC. BTW, in your picture, why do you connect GND of nano board to the GND of input of DC-DC?

      Thanks, I will check with an isolated DC DC Converter.  
     We shall try that, I see new capacitors on the new Development board. Will these help stabilize the voltage levels ? Do you know why are there added?

This is to show that there is a potential difference of a few milliVolts present between the two grounds. Its not a continuous connection. It is just to measure if the potential difference could make some problem.

In theory more caps should be better for it, but not sure how better it could be. So still better to try external big cap.