US 12,217,325 B2
Color managed embedding system for embedding signals in color artwork
Jerry Allen McMahan, Jr., Oakwood, OH (US)
Assigned to Digimarc Corporation, Beaverton, OR (US)
Filed by Digimarc Corporation, Beaverton, OR (US)
Filed on Oct. 27, 2023, as Appl. No. 18/496,785.
Application 18/496,785 is a continuation of application No. 17/537,022, filed on Nov. 29, 2021, granted, now 11,836,824.
Application 17/537,022 is a continuation of application No. 17/067,717, filed on Oct. 11, 2020, granted, now 11,188,996, issued on Nov. 30, 2021.
Application 17/067,717 is a continuation in part of application No. 16/703,601, filed on Dec. 4, 2019, granted, now 11,070,701, issued on Jul. 20, 2021.
Claims priority of provisional application 63/059,774, filed on Jul. 31, 2020.
Claims priority of provisional application 63/029,297, filed on May 22, 2020.
Claims priority of provisional application 63/001,035, filed on Mar. 27, 2020.
Claims priority of provisional application 62/933,042, filed on Nov. 8, 2019.
Claims priority of provisional application 62/914,302, filed on Oct. 11, 2019.
Prior Publication US 2024/0257291 A1, Aug. 1, 2024
Int. Cl. G06T 1/00 (2006.01); G01J 3/46 (2006.01); G06T 7/90 (2017.01); G06T 11/00 (2006.01)
CPC G06T 1/0021 (2013.01) [G01J 3/462 (2013.01); G01J 3/463 (2013.01); G06T 7/90 (2017.01); G06T 11/001 (2013.01)] 13 Claims
OG exemplary drawing
 
3. An apparatus comprising:
an input to obtain a reflectance value representing an image pixel or group of image pixels within a wavelength range, the image pixel representing artwork including a cyan value, a magenta value, and a yellow value;
means for altering the reflectance value according to an information carrying signal, said means for altering yielding a target reflectance value within the wavelength range;
means for changing, in a first direction, the cyan value to achieve the target reflectance value, said means for changing yielding changed pixel color values;
means for evaluating a luminance (L*) value of the changed pixel color values relative to a luminance (L*) value of the image pixel or group of image pixels;
means for changing, in a second direction opposite of the first direction, a magenta value of the changed pixel color values to minimize a change in luminance (*L) between the luminance (L*) value of the changed pixel color values relative to the luminance (L*) value of the image pixel or group of image pixels while maintaining the target reflectance value within 0-5%.