US 12,136,202 B2
Content adaptive filtering via ringing estimation and suppression
Keith Lee, Markham (CA); Edward George Callway, Markham (CA); and Isobel Lees, Toronto (CA)
Assigned to ATI Technologies ULC, Markham (CA)
Filed by ATI Technologies ULC, Markham (CA)
Filed on Sep. 29, 2021, as Appl. No. 17/488,982.
Prior Publication US 2023/0096874 A1, Mar. 30, 2023
Int. Cl. G06V 10/25 (2022.01); G06T 5/80 (2024.01)
CPC G06T 5/80 (2024.01) [G06V 10/25 (2022.01); G06T 2207/20024 (2013.01); G06T 2207/20224 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a ring estimator circuit comprising circuitry configured to estimate an amount of ringing in an image when filtering a set of pixel data of the image with a first filter, the ringing corresponding to visual artifacts in the image;
a blend factor calculation circuit comprising circuitry configured to:
generate a measure of flatness based on luma differences between adjacent pixel values for the set of pixel data;
generate a blend factor to suppress the ringing in the image based on the measure of flatness;
a blend circuit comprising circuitry configured to blend filtering of the set of pixel data between the first filter and a second filter based on the blend factor.