US 12,333,682 B2
Photorealistic image color style transfer compression
Han Gong, Norwich (GB); and Alex Hayes, Ely (GB)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 6, 2023, as Appl. No. 18/164,866.
Prior Publication US 2024/0265499 A1, Aug. 8, 2024
Int. Cl. G06T 5/50 (2006.01); G06T 3/40 (2024.01); G06T 7/90 (2017.01)
CPC G06T 5/50 (2013.01) [G06T 3/40 (2013.01); G06T 7/90 (2017.01); G06T 2207/10024 (2013.01); G06T 2207/20081 (2013.01); G06T 2207/20084 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image enhancement method comprising:
receiving an input image and target image pair, wherein each of the input image and target image comprises data representing pixel luminance and data representing pixel color, and wherein each of the input image and target image have a first resolution;
processing the input image data representing pixel luminance to determine a plurality of basis functions, wherein each basis function is determined based, at least in part, on a content of the input image;
determining a combination of the basis functions to modify the data representing pixel luminance of the input image to approximate the data representing pixel luminance of the target image;
applying the plurality of basis functions to a version of the input image having a second resolution to produce a luminance-corrected approximation of the target image having the second resolution, wherein the second resolution is larger than the first resolution;
learning a color similarity transform to match the data representing pixel color of the input image to the data representing pixel color of the target image; and
applying the learned color similarity transform to the luminance-corrected approximation of the target image to generate an output image having the second resolution.