I cannot see any power return for the camera power anywhere. The red and black wires (+12v and gnd) for the camera appear to only connect to the camera decoder (whatever that is - a switch?) but there is only a single wire feeding the decoder...

If you get any signal from the camera the power return must be coming from the video cable and this could make for a very unstable picture.

Did the decoder come with the camera or did you buy it separately?

Try connecting the black wire from the camera to a ground screw somewhere and see if the image improves.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)