What does modulation transfer function quantify in imaging?

What does modulation transfer function quantify in imaging?

• A. It measures the brightness of the image.
• B. It measures the accuracy of reproduction across spatial frequencies.
• C. It measures the geometric distortion of shapes.
• D. It measures the color depth of the image.

Answer: (C)

MTF measures how accurately an imaging system reproduces image contrast as the level of detail changes. Spatial frequency corresponds to how fine the pattern is: low frequencies are large, broad features, while high frequencies are fine textures. The MTF is the ratio of image contrast to object contrast for different spatial frequencies, typically shown as a curve. A system that preserves contrast across frequencies well will have an MTF that remains high at more frequencies; real systems show a drop-off at higher frequencies due to blur, diffraction, and aberrations. This is a direct way to quantify sharpness and resolution. It’s not about brightness, geometric distortion, or color depth.

MTF measures how accurately an imaging system reproduces image contrast as the level of detail changes. Spatial frequency corresponds to how fine the pattern is: low frequencies are large, broad features, while high frequencies are fine textures. The MTF is the ratio of image contrast to object contrast for different spatial frequencies, typically shown as a curve. A system that preserves contrast across frequencies well will have an MTF that remains high at more frequencies; real systems show a drop-off at higher frequencies due to blur, diffraction, and aberrations. This is a direct way to quantify sharpness and resolution. It’s not about brightness, geometric distortion, or color depth.