DIS Quality Assurance & Testing Flashcards

What is the purpose of a step wedge (gray scale) target in scanner quality assurance testing?

Answer: To evaluate a scanner's ability to reproduce a range of tonal values from white to black accurately

A step wedge target provides a series of known tonal steps that allow testers to verify a scanner's tonal accuracy and dynamic range.

Which metric is used to measure the sharpness and resolving power of an imaging system?

Answer: MTF (Modulation Transfer Function)

MTF (Modulation Transfer Function) quantifies how well an imaging system reproduces fine detail and contrast at various spatial frequencies.

What does 'image noise' refer to in the context of digital imaging quality assurance?

Answer: Random variation in brightness or color values in an image not present in the original scene

Image noise is random pixel-level variation in brightness or color that degrades image quality, often caused by sensor limitations or high ISO settings.

In QA testing for a digital imaging workflow, what is a 'target image' used for?

Answer: A standardized reference image used to verify and calibrate the accuracy of an imaging system

A target image is a standardized reference used during QA to verify that an imaging system produces accurate, consistent results matching known values.

What is the function of Delta-E (ΔE) measurement in imaging quality assurance?

Answer: It quantifies the perceptible color difference between a captured image and the reference target

Delta-E (ΔE) is a numerical measure of the color difference between two images or color samples, with lower values indicating closer color accuracy.

Which type of test chart is commonly used to assess the resolution of a digital camera or scanner?

Answer: ISO 12233 resolution chart

The ISO 12233 chart is the standard test chart for measuring the spatial resolution and sharpness of digital cameras and scanners.