US 11,715,183 B2
Overlapped curve mapping for histogram-based local tone and local contrast
Ying-Ru Chen, Toufen (TW)
Assigned to Advanced Micro Devices, Inc., Santa Clara, CA (US)
Filed by Advanced Micro Devices, Inc., Santa Clara, CA (US)
Filed on Jun. 1, 2022, as Appl. No. 17/830,030.
Application 17/830,030 is a continuation of application No. 17/114,480, filed on Dec. 7, 2020, granted, now 11,354,788.
Prior Publication US 2022/0292653 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 5/00 (2006.01); G09G 5/02 (2006.01); G06T 5/40 (2006.01)
CPC G06T 5/008 (2013.01) [G06T 5/40 (2013.01); G09G 5/026 (2013.01); G09G 2320/0242 (2013.01); G09G 2320/066 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A non-transitory computer readable storage medium storing computer code thereon for execution by at least one processor, the computer code comprising:
instructions to select an input pixel from within a plurality of blocks of pixels of at least a portion of an input image, wherein the plurality of pixel blocks include at least three blocks of pixels in a vertical direction and at least three blocks of pixels in a horizontal direction, and wherein the input pixel has an input pixel value and a pixel location and the input pixel is located within a first block of pixels;
instructions to generate a respective initial block mapping curve for each block of the plurality of blocks;
instructions to determine, from the plurality of blocks of pixels, a set of overlap blocks based on the pixel location;
instructions to generate a first new pixel value for the input pixel based on a spatially low-pass filtered block mapping curve, wherein the spatially low-pass filtered block mapping curve is a function of a weighted average of the respective initial block mapping curves for each overlap block of the set of overlap blocks;
instructions to select a different pixel within the first block of pixels, the different pixel having a different location than the input pixel; and
instructions to generate a second new pixel value for the different pixel based on a different spatially low-pass filtered block mapping curve for the first block of pixels, wherein the different spatially low-pass filtered block mapping curve is a function of the respective initial block mapping curves for each overlap block of the set of overlap blocks and the different location.