Patent ID: 11924476
Assignee: GOOGLE LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. A method for restoring a degraded frame resulting from reconstruction of a source frame, comprising:
receiving a compressed bitstream, wherein the compressed bitstream comprises:
a first projection parameter α a second projection parameter β;
a first indication of first restoration parameters comprising a first radius value; and
a second indication of second restoration parameters comprising a second radius value; and

restoring at least a portion of the degraded frame using a projection operation that uses the first projection parameter α, the second projection parameter β, and at least two guide tiles, wherein restoring the at least the portion of the degraded frame comprises:
generating, using the first restoration parameters, a first guide tile Y1 for a degraded tile Y of the degraded frame;
generating, using the second restoration parameters, a second guide tile Y2 for the degraded tile Y; and
generating a reconstructed tile YR of a reconstructed frame, wherein the projection operation comprises calculating α(Y1−Y)+β(Y2−Y).