US 12,379,314 B2
Method and apparatus for measuring surface gloss and spectral reflectance
Zhiling Xu, Princeton Junction, NJ (US); Nilesh B. Dhote, Ewing, NJ (US); David Williams, Westampton, NJ (US); Seaver Li, Belle Mead, NJ (US); William Binder, Lakeville, PA (US); and Venkata R. Thumu, Pennington, NJ (US)
Assigned to Datacolor, Inc., Lawrenceville, NJ (US)
Filed by Datacolor, Inc., Lawrenceville, NJ (US)
Filed on Sep. 13, 2022, as Appl. No. 17/931,895.
Prior Publication US 2024/0085323 A1, Mar. 14, 2024
Int. Cl. G01N 21/57 (2006.01); G01N 21/25 (2006.01)
CPC G01N 21/57 (2013.01) [G01N 21/251 (2013.01); G01N 2201/062 (2013.01); G01N 2201/127 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
controlling, by a processing system including at least one processor, a gloss channel of a color measurement apparatus to measure a surface gloss of a color sample to generate a gloss value for the color sample;
controlling, by the processing system, a color channel of the color measurement apparatus to measure a reflectance spectrum of the color sample to generate a first plurality of reflectance values for the color sample under a first measurement geometry, wherein the reflectance spectrum is measured indirectly under the first measurement geometry, wherein the controlling the color channel of the color measurement apparatus to measure the reflectance spectrum of the color sample comprises converting a channel response of a multi-band color sensor of the color channel into the first plurality of reflectance values using a transformation matrix that is derived during a calibration of the color measurement apparatus, and wherein the calibration utilizes a plurality of color calibration standards having known gloss values; and
converting, by the processing system, the first plurality of reflectance values to a second plurality of reflectance values representing the reflectance spectrum of the color sample under a second measurement geometry, different from the first measurement geometry, wherein the converting comprises adjusting the first plurality of reflectance values by an amount that is calculated directly from the gloss value that is generated.