Which control could you adjust to improve the signal-to-noise ratio on the image?

Which control could you adjust to improve the signal-to-noise ratio on the image?

• A. Frame averaging
• B. Dynamic range
• C. Gray-scale map
• D. Edge enhancement

Answer: (A)

The key idea is improving the signal relative to random noise by combining information from multiple frames. When you average several frames of the same scene, the actual signal stays the same in each frame, while the random noise varies. Averaging reduces those random fluctuations, so the noise level drops while the true signal remains, boosting the signal-to-noise ratio. The improvement scales with the number of frames averaged, though you trade off temporal resolution and potential motion blur if the scene changes between frames. Dynamic range changes how wide a span of brightness values the system can display, but it doesn’t reduce random noise. Gray-scale mapping only affects how intensities are displayed, not the underlying noise. Edge enhancement sharpens edges by boosting high-frequency components, which can actually make noise more noticeable and hurt SNR rather than help it.

The key idea is improving the signal relative to random noise by combining information from multiple frames. When you average several frames of the same scene, the actual signal stays the same in each frame, while the random noise varies. Averaging reduces those random fluctuations, so the noise level drops while the true signal remains, boosting the signal-to-noise ratio. The improvement scales with the number of frames averaged, though you trade off temporal resolution and potential motion blur if the scene changes between frames.

Dynamic range changes how wide a span of brightness values the system can display, but it doesn’t reduce random noise. Gray-scale mapping only affects how intensities are displayed, not the underlying noise. Edge enhancement sharpens edges by boosting high-frequency components, which can actually make noise more noticeable and hurt SNR rather than help it.