US 11,941,783 B2
Scaler de-ringing in image processing circuitry
Mahesh B. Chappalli, San Jose, CA (US); and Vincent Z. Young, San Francisco, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 14, 2021, as Appl. No. 17/149,425.
Claims priority of provisional application 63/072,086, filed on Aug. 28, 2020.
Prior Publication US 2022/0067885 A1, Mar. 3, 2022
Int. Cl. G06T 5/00 (2006.01); G06T 1/20 (2006.01); G06T 3/40 (2006.01); G06T 3/4007 (2024.01); G06T 5/50 (2006.01)
CPC G06T 5/002 (2013.01) [G06T 1/20 (2013.01); G06T 3/4007 (2013.01); G06T 5/50 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, at de-ringing circuitry of a display pipeline of an electronic device, scaled image content based on image data, wherein the scaled image content comprises linearly scaled content;
receiving, at the de-ringing circuitry, a fallback scaler output, wherein the fallback scaler output comprises non-linearly scaled content;
determining whether the image data has a change frequency greater than a threshold, wherein the change frequency comprises differences between adjacent pixels using pixel difference circuitry that comprises a plurality of subtractors and absolute value circuitries configured to determine sign-less differences between the adjacent pixels in the image data;
in response to the change frequency being above the threshold, determining a weight based on the linearly scaled content and the non-linearly scaled content; and
blending the scaled image content and the fallback scaler output based at least in part on the weight.