System and method to estimate blockiness in transform-based video encoding

US11943450B2 · kind B2 · utility

Assignee

• DEUTSCHE TELEKOM AG · DE

Inventors

• Peter List · Bonn, DE
• Rakesh Ramachandra · Ilmenau, DE
• Werner Robitza · Wien, AT
• Alexander Raake · Berlin, DE
• Steve Goering · Menteroda, DE
• Ulf Wuestenhagen · Großenheide, DE
• Bernhard Feiten · Berlin, DE

Key dates

• Filing date: Jul 23, 2020
• Grant date: Mar 26, 2024
• Expiry date: Mar 31, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N21/23418
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for estimating blockiness in a video frame of transform-based video encoding includes: obtaining a bitstream of a transform coded video signal, the signal being partitioned into video frames and all operations being performed on a per frame basis, wherein coefficients constituting transforms encoded in the bitstream of the video frames are read; averaging the coefficients of the transforms encoded in the bitstream into one averaged transform matrix per transform block size i; generating or making available one weighting matrix per averaged transform of block size i; computing intermediate weighted average transform matrices; processing all members of each weighted and averaged transform matrix into a single value per transform of block size i, to obtain intermediate signals; and computing a single value by weighting values of the intermediate signals according to an area in the respective video frame and adding up the weighted values of the intermediate signals.