How to implement underwater camera with composite output?

Question

Arduino

The people, who will tell you how to implement an underwater camera?
Here, the whole thing is this: You need to make a camera (most likely some camera from an old Nokia will be taken (because I have a lot of friends in repair = 0)). , which will fit into a small case and connect to the microcircuit. The chip will output Composite (this is important) video signal.
Here the first question arises ... What is better to take? Will, say, STM32F103 be enough? Or STMf4?
Or don't bother and take CHIP (he should cope with this task, because he has a composite right away, a 1GHz System on a Chip with a video core ... A lot of RAM ... Linux)?
The next question is where to place it?
The body is a truncated cone with dimensions (length) 5 cm * (diameter of the larger base) 4 cm * (diameter of the small base) 3.5 cm. Since this is an underwater camera, in which the wire length can reach 20 (!) m. , then, most likely, there will be signal drops from the camera to the chip ...
Maybe someone will tell you how best to organize this?

Answer 1

I think you need to take a ready-made surveillance camera for 600-700 TVL, I don’t know what your piling up from a Nokia camera in conjunction with an analog converter will be able to do - an analog Sony camera with an excellent matrix costs up to $ 50 (without a case) there you will have a stable FPS and they are initially designed for long cables.
Do not forget about the battery, you will also need to shove it into the case