Which statement about frame averaging is true?

• A. It reduces random noise
• B. It increases frame rate
• C. It increases image sharpness without trade-offs
• D. It lowers resolution

Answer: (A)

Frame averaging improves image quality by reducing random noise through combining several frames into one. Because random noise fluctuates unpredictably from frame to frame while the real scene remains constant, averaging cancels much of that noise and leaves the true signal clearer. The more frames you average, the greater the noise reduction, roughly scaling with the square root of the number of frames.

That makes the statement about reducing random noise the best description of what frame averaging does. It does not increase frame rate—you still capture the same number of frames per second, and any averaging process can add latency or blur motion, reducing temporal detail. It also doesn’t inherently boost sharpness without trade-offs; in fast or changing scenes, averaging can smear details over time. It doesn’t change spatial resolution itself, though perceived sharpness may worsen if motion isn’t perfectly aligned.