In general, anything interfering with accurate image formation is known as which term?

In general, anything interfering with accurate image formation is known as which term?

• A. Underexposure
• B. Overexposure
• C. Motion
• D. Noise

Answer: (D)

Noise is the term for any random, unwanted variation that interferes with the recorded signal and degrades image quality. It isn’t a single specific artifact like motion blur or exposure error; instead, it covers the random fluctuations in pixel values that obscure details. Sources include quantum noise from few photons, electronic/readout noise in the detector, and other random processes in the imaging chain. Because noise is random, it appears as graininess and lowers the signal-to-noise ratio, making fine structures harder to see, even if the overall exposure is correct.

Noise is the term for any random, unwanted variation that interferes with the recorded signal and degrades image quality. It isn’t a single specific artifact like motion blur or exposure error; instead, it covers the random fluctuations in pixel values that obscure details. Sources include quantum noise from few photons, electronic/readout noise in the detector, and other random processes in the imaging chain. Because noise is random, it appears as graininess and lowers the signal-to-noise ratio, making fine structures harder to see, even if the overall exposure is correct.