1. A system takes input “signals” and in return gives output “signals”. For example, an organism’s digestive “system” takes food “input”, and gives ATP (energy) and waste “output”. What is the input and output for a camera system? Bonus: 1a. What are the measured quantities or ‘units’ for a camera system’s input and output? Example: Digestion system has biomass or molecules of “food input”, and molecules of “ATP output”. Note: This may be redundant if you answered question 1 precisely. Bonus 2. “Signals” can have “noise”, which is random/informationless variation in the signal. How does noise manifest itself in the output signal of a camera system? Basically: define noise. 3. The amount of apparent “noise” is not measured in absolute quantities, but the ratio of noise to the actual signal, or Signal divided by Noise. This is also known as “Signal to Noise Ratio (SNR)”. For a camera’s light input, the Noise/Signal is sqrt(x)/x, where x is the Week 5 Quiz 0 2000 4000 6000 8000 10000 0% 5% 10% Noise Amount of light