METHOD AND SYSTEMS FOR QUANTIFYING DIFFERENCES BETWEEN COLORED SURFACES

摘要

A system and method of quantifying a difference between gonioapparent colored surfaces includes determining a lightness (L*), a sparkle area (Sa), and a sparkle intensity (Si) of the first and second surfaces at a first aspecular angle and at a second aspecular angle. A sparkle metric (SpkM) to quantify the difference between the first and second surfaces is calculated utilizing the lightness (L*), the sparkle area (Sa), and the sparkle intensity (Si) of the first and second surfaces at the first and second aspecular angles.

主权项

1. A method of quantifying a difference between a first gonioapparent surface and a second gonioapparent surface, said method comprising:
determining a first set of correlated lightness (L*), sparkle area (Sa), and sparkle intensity (Si) of the first gonioapparent surface and the second gonioapparent surface at a first aspecular angle; generating a first set of sparkle grade (Sg) of the first gonioapparent surface and the second gonioapparent surface based on the respective first correlated set of sparkle area (Sa) and sparkle intensity (Si) of the first gonioapparent surface and the second gonioapparent surface; calculating a first set of normalized sparkle grade difference tolerances (Ksg) with a processor utilizing the first set of lightness (L*), sparkle grade (Sg), and a predefined visual tolerance function (Ksg) based on model lightness (L*) and model sparkle grade (Sg) derived from model sparkle intensity (Si) and model sparkle area (Sa) obtained from a plurality of model surfaces at a plurality of aspecular angles; and calculating a sparkle metric (SpkM) with a processor to produce a quantified difference between the first and second gonioapparent surfaces according to the first set of lightness (L*), the first set of sparkle grade (Sg), and the first set of normalized sparkle grade difference tolerances (Ksg).