What is the purpose of radiometric calibration in image-based VIM?

• A. Provide Accurate Reflectance Values for Materials, Aiding Defect Differentiation
• B. Improve Color Fidelity
• C. Align Geometric Alignment
• D. Reduce File Size

Answer: (A)

Radiometric calibration provides accurate reflectance values for materials by converting raw sensor data into physical measurements that reflect how surfaces truly respond to light. In image-based VIM, this matters because the goal is to compare material properties and detect defects across images that may come from different times, lighting conditions, or cameras. By correcting for the camera’s response, lens effects, and illumination, radiometric calibration places all measurements on the same scale, so differences you see are due to the materials or defects themselves rather than variations in lighting or sensor behavior. This makes defect differentiation reliable and objective, since you can quantify whether a surface matches its expected reflectance or shows deviations that indicate flaws. While improving color fidelity and geometric alignment can be helpful in other contexts, they are not the primary aim of radiometric calibration, and reducing file size isn’t related to this process.