Image Encoding and Decoding With Mode-Based Block Scanning

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Solution Overview

Problem

Existing image compression techniques face challenges in enhancing compression efficiency, particularly in inter and intra prediction methods, which are crucial for handling high-resolution and stereographic image content.

Innovation Solution

The method and device enhance compression efficiency by deriving motion vectors for current picture reference modes, determining adaptive encoding/decoding orders, and generating reference samples using interpolation filters based on block size and intra prediction modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional image compression techniques are used, then basic compression is achieved, but compression efficiency is insufficient for high-resolution and stereographic image content

Engineering Contradiction:

Improvecompression efficiencyVSAvoidprediction accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic prediction mode selection where the encoder adapts between inter prediction and current picture reference mode based on motion vector characteristics. The system dynamically adjusts prediction strategies according to the specific characteristics of each block, enabling optimized compression efficiency while maintaining prediction accuracy for diverse image content including high-resolution and stereographic images

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent modifies prediction parameters by deriving motion vectors specifically for current picture reference mode and using them to determine reference block positions. The system changes prediction parameters adaptively based on block characteristics and motion information, improving compression efficiency without sacrificing prediction reliability

Inventive Principle:

Principle #35Parameter changes

2Productivity

If motion vectors are derived for current picture reference mode, then inter prediction efficiency is enhanced, but device complexity increases

Engineering Contradiction:

Improveinter prediction efficiencyVSAvoidprediction mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent creates a unified prediction framework where the same motion vector derivation mechanism serves both traditional inter prediction and current picture reference mode. The system uses a single set of tools and algorithms to handle multiple prediction scenarios, enhancing inter prediction efficiency while avoiding the need for separate complex mechanisms for each mode

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the prediction processing steps by combining motion vector derivation and reference block determination into a unified current picture reference mode framework. This integration reduces the number of separate processing stages and simplifies the overall prediction mechanism while maintaining high prediction efficiency

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If adaptive encoding/decoding order is determined, then intra prediction efficiency is improved, but processing time increases

Engineering Contradiction:

Improveintra prediction efficiencyVSAvoidencoding/decoding processing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent performs preliminary determination of the optimal encoding/decoding order based on intra prediction mode characteristics before actual prediction processing begins. By pre-calculating the optimal scan order and preparing reference samples in advance according to the determined order, the system improves intra prediction efficiency while minimizing additional processing time during the actual prediction operation

Inventive Principle:

Principle #10Preliminary action

4Measurement precision

If reference samples are generated using interpolation filters, then intra prediction accuracy is improved, but computational complexity increases

Engineering Contradiction:

Improveintra prediction accuracyVSAvoidreference sample generation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by selecting and applying interpolation filters specifically at boundaries where reference samples are needed, rather than applying complex processing uniformly across the entire block. The system determines optimal filter characteristics based on local image characteristics and prediction mode, improving intra prediction accuracy at critical locations while avoiding unnecessary computational complexity in regions where simple processing suffices

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250220167A1Method and device for encoding/decoding image

Publication Date: 2025.07.03 DOLBY INTERNATIONAL AB

AI summary

A device for encoding/decoding the image according to the present invention includes an intra prediction module configured to: determine an intra prediction mode of a current block; determine a scanning order of multiple sub blocks in the current block on the basis of the determined intra prediction mode; and perform intra prediction of the current block on the basis of the determined scanning order.