US 11,715,184 B2
Backwards-compatible high dynamic range (HDR) images
Garrett M. Johnson, San Francisco, CA (US); and Paul M Hubel, Mountain View, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 23, 2020, as Appl. No. 17/29,800.
Prior Publication US 2022/0092749 A1, Mar. 24, 2022
Int. Cl. H04N 23/70 (2023.01); G06T 5/00 (2006.01); G06T 3/40 (2006.01); G06T 5/50 (2006.01); H04N 23/741 (2023.01)
CPC G06T 5/009 (2013.01) [G06T 3/40 (2013.01); G06T 5/50 (2013.01); H04N 23/741 (2023.01); G06T 2207/10016 (2013.01); G06T 2207/20208 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A device, comprising:
a display device;
a memory; and
one or more processors operatively coupled to the memory, wherein the one or more processors are configured to execute instructions causing the one or more processors to:
obtain two or more exposures of a scene captured by one or more image capture devices;
create a gain map based on at least one of the two or more exposures, wherein the gain map comprises a plurality of pixels each corresponding to a portion of the scene, and wherein values of the pixels in the gain map comprise indications of a brightness level of the corresponding portions of the scene;
combine the two or more exposures to form a first image, wherein the gain map has a lower resolution than the first image;
tone map the first image based on a first Standard Dynamic Range (SDR) format to generate a first SDR image of the scene; and
store the first SDR image and created gain map in a first enhanced image file.