US 8,275,209 B2 · Reduced DC gain mismatch and DC leakage in overlap transform processing

Abstract

In certain embodiments, overlap operators are applied during encoding and/or decoding of digital media, where the overlap operators have reduced DC gain mismatch and/or DC leakage between interior overlap operators and overlap operators at the edge and/or corner. In other embodiments, information indicating a selected tile boundary option for overlap processing can be encoded and/or decoded. The selected tile boundary option indicates one of a hard tile boundary option and a soft tile boundary option for processing with overlap operators. Overlap transform processing can then be applied based at least in part on the selected tile boundary option.

Claims20

Dependent claims

A method of performing an inverse overlap transform used to decode digital media using a digital media decoding device, the method comprising:

with the digital media decoding device, performing an inverse frequency transformation on digital media;
and
with the digital media decoding device, applying a plurality of overlap operators to results of the inverse frequency transformation, the plurality of overlap operators including at least a first overlap operator and a second overlap operator, wherein the first overlap operator is an interior overlap operator, and wherein the second overlap operator is an edge or corner overlap operator, each of the plurality of overlap operators being characterized by substantially equivalent DC gain.

A digital media decoder comprising:

a memory unit for storing digital media data to be decoded;
and
a processing unit programmed to:
perform an inverse frequency transformation on digital media;
and
apply a plurality of overlap operators to results of the inverse frequency transformation, the plurality of overlap operators including at least a first overlap operator and a second overlap operator, wherein the first overlap operator is an interior overlap operator, and wherein the second overlap operator is an edge or corner overlap operator, each of the plurality of overlap operators being characterized by substantially equivalent DC gain.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/571,365Filed 30 Sep 2009 · us provisional application

Priority

10 Oct 2008

Published

US 2010/0092098 A115 Apr 2010

Granted

25 Sep 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06F 17/147
Fourier, Walsh or analogous domain transformations , e.g. Laplace, Hilbert, Karhunen-Loeve, transforms: discrete orthonormal transforms, e.g.…
H04N 19/117
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: filters, e.g. for pre-processing or…
H04N 19/122
Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or…:…
H04N 19/14
Incoming video signal characteristics or properties: coding unit complexity, e.g. amount of activity or edge presence estimation

Reduced DC gain mismatch and DC leakage in overlap transform processing

Life of this patent

Reduced DC gain mismatch and DC leakage in overlap transform processing

Life of this patent

Abstract

Claims20