Distinctiveness of Image (DOI) and Reflected Image Quality (RIQ) are parameters used for measuring the quality of a highly polished, coated or chromed surface.
Two Highly reflective surfaces having very small changes in texture shows very little change in DOI, but will appear different visually.
Reducing the sensing distance around the specular angle and measuring the reflected distorted light around it, produces a higher resolution response with greater linearity, more in line with the visual experience.
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