Video Block Decoding with CTU and Transform Size Constraints

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Solution Overview

Problem

Existing video coding standards face challenges in efficiently decoding video frames due to the complexity and variability of video formats, particularly in handling different chroma formats and resolutions, which can lead to inefficiencies in processing and resource utilization.

Innovation Solution

Implementing a method for decoding video frames by constraining and determining the maximum transform and coding tree unit sizes using fixed-length codewords, allowing for more efficient decoding by limiting the complexity of block structures and enabling flexible subprofiling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If video coding standards support multiple chroma formats and resolutions, then versatility and adaptability are improved, but device complexity and processing difficulty increase

Engineering Contradiction:

Improvecompatibility with various video formatsVSAvoidcomplexity of block structures

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by introducing a maximum transform block size constraint parameter that limits the transform block size to a predetermined value or less. This parameter control mechanism allows the system to maintain versatility across different video formats while managing complexity by constraining transform block dimensions, thereby resolving the contradiction between adaptability and device complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics through the maximum enabled transform block size parameter that can be dynamically adjusted based on video content characteristics and format requirements. This dynamic parameter allows the system to adapt transform block sizes according to specific decoding scenarios, balancing versatility with complexity management across different video formats

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If video coding standards support multiple chroma formats and resolutions, then adaptability is improved, but processing time and resource utilization increase

Engineering Contradiction:

Improvecompatibility with various video formatsVSAvoidprocessing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies parameter changes by setting a maximum transform block size constraint that prevents excessive transform block dimensions. This parameter control reduces the computational burden and processing time required for decoding various video formats, while still maintaining the ability to handle different chroma formats and resolutions effectively

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements partial action by applying the maximum transform block size constraint selectively based on video content characteristics. Rather than uniformly constraining all transform blocks, the system applies the constraint where necessary to reduce processing time while maintaining quality where full transform blocks are beneficial, thus balancing adaptability with processing efficiency

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If maximum transform block size is increased, then decoding accuracy is improved, but computational requirements and resource utilization increase

Engineering Contradiction:

Improvedecoding accuracyVSAvoidcomputational requirements

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by introducing a maximum transform block size constraint parameter that balances decoding accuracy with computational requirements. By controlling the transform block size to a predetermined maximum, the system maintains sufficient decoding accuracy for various video formats while preventing excessive computational resource consumption that would arise from larger transform blocks

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260067504A1Method, apparatus and system for encoding and decoding a block of video samples

Publication Date: 2026.03.05 CANON KK

AI summary

Decoding an image frame from a bitstream, the image frame being divided into a plurality of coding tree units. The method comprises decoding a maximum transform block size constraint and or a maximum coding tree unit (CTU) size constraint from the bitstream; and decoding a maximum enabled transform block size and/or a maximum enabled CTU size from the bitstream. The decoded maximum enabled transform block size is less than or equal to the decoded maximum transform block size constraint. The decoded maximum enabled CTU size is less than or equal to the decoded maximum CTU size constraint. Determining each of the one or more transform blocks for each of the plurality of coding tree units according to the decoded maximum enabled transform block size, maximum enabled CTU and split flags decoded from the bitstream; and decode each of the determined one or more transform blocks from the bitstream.