Scalable Video Decoder Offset Prediction

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Solution Overview

Problem

Scalable video encoding technologies face challenges in maintaining image quality when bitrate is reduced, particularly due to differences in aspect ratios between video frames in different layers, which complicates inter-sequence picture prediction and reduces coding efficiency.

Innovation Solution

The method involves using offset information to determine the positional relationship between boundary pixels of reference images from the base layer and current images in the enhanced layer, allowing for efficient prediction and encoding by up-sampling or cropping base layer images to match the enhanced layer's aspect ratio, thereby reducing redundancy and improving coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If inter-sequence picture prediction is performed from base layer to enhanced layer, then coding efficiency is improved, but aspect ratio differences between layers cause prediction accuracy degradation

Engineering Contradiction:

Improvecoding efficiencyVSAvoidprediction accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent transforms the base layer picture parameters by applying up-sampling and cropping operations to change its resolution and aspect ratio, making it compatible with the enhanced layer picture dimensions. This parameter transformation enables accurate inter-sequence prediction despite the original aspect ratio differences between layers.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If base layer pictures are used for enhanced layer prediction, then redundancy is reduced, but aspect ratio mismatch complicates the prediction process

Engineering Contradiction:

Improveredundancy reductionVSAvoidprediction process complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent performs up-sampling and cropping operations on the base layer picture in advance, before the actual prediction process. This preliminary transformation of the base layer picture to match the enhanced layer dimensions simplifies the subsequent prediction operations by eliminating the need to handle aspect ratio mismatches during the prediction itself.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If auxiliary picture sequences are provided for different bitrates, then adaptability is improved, but image quality significantly degrades when bitrate is lowered

Engineering Contradiction:

Improvebitrate adaptabilityVSAvoidimage quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent merges the base layer and enhanced layer into a unified scalable video coding structure where the enhanced layer utilizes prediction from the base layer. This merging allows the system to maintain high image quality in the enhanced layer by leveraging the base layer information, while still providing bitrate adaptability through the layered structure.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7593467B2Method and apparatus for decoding video signal using reference pictures

Publication Date: 2009.09.22 LG ELECTRONICS INC

AI summary

In the method for decoding a video signal, at least a portion of a current image in a current layer is predicted based on at least a portion of a reference image and offset information. The offset information may indicate a position offset between at least one boundary pixel of the reference image and at least one boundary pixel of the current image.