Video Coding Prediction Simplification Using Line Buffer Logic
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Solution Overview
Problem
Current video coding technologies face challenges in efficiently encoding and decoding high-definition to 8K×4K video data, leading to increased data volume and computational complexity, while maintaining image quality.
Innovation Solution
The method involves decoding and encoding syntax elements for video coding units by identifying whether the above coding unit is within the coding tree unit, using syntax elements from a line buffer if it is, or default values if it is not, to optimize prediction and compression processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video coding uses prediction based on neighboring blocks to reduce redundancy, then compression efficiency is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent divides the video frame into Coding Tree Units (CTUs) and further into Coding Units (CUs), allowing independent processing and prediction for each segment. This segmentation enables the system to use prediction based on neighboring blocks within the same CTU while maintaining manageable computational complexity through hierarchical structure.
Solution Approach 2:
The patent applies different prediction methods and parameters to different regions (CUs) within the video frame based on their local characteristics. Each CU can use prediction from its specific neighboring blocks, optimizing compression efficiency locally while the overall system manages complexity through selective application of prediction techniques.
2Manufacturing precision
If video coding processes high-definition to 8K×4K video data, then image quality is improved, but data volume and processing requirements increase
Solution Approach 1:
By dividing the high-resolution video frame into multiple CTUs and CUs, the patent enables efficient processing of large data volumes through hierarchical segmentation. Each unit can be processed independently, reducing the immediate processing burden while maintaining the ability to handle 8K×4K resolution data.
Solution Approach 2:
The patent dynamically adjusts coding parameters such as transform size, prediction mode, and quantization based on the local characteristics of each CU. This adaptive parameter selection optimizes the balance between image quality and data volume for high-definition video while managing processing requirements.
3Measurement precision
If video coding uses syntax elements from line buffer for prediction, then prediction accuracy is improved, but memory allocation increases
Solution Approach 1:
The patent segments the video data into CTUs with associated line buffers, limiting memory allocation to only the current and neighboring CUs within each CTU. This segmentation approach maintains prediction accuracy by providing sufficient context for syntax elements while preventing excessive memory consumption that would occur with global buffering.
Solution Approach 2:
The patent allocates memory locally for each CTU and its associated line buffer, only storing syntax elements and prediction data that are immediately needed for processing that specific region. This local memory allocation strategy maintains prediction accuracy for each region while significantly reducing overall memory requirements compared to buffering entire frames.
Data Source
AI summary
A method of decoding a syntax element for a current coding unit of video data is performed by an electronic apparatus. The electronic apparatus receives a video bitstream, and identifies, for the current coding unit, an above coding unit and a coding tree unit including the current coding unit. After determining that the above coding unit is within the coding tree unit, the electronic apparatus decodes, from the video bitstream, a corresponding syntax element for the current coding unit based, at least in part, on a syntax element associated with the above coding unit retrieved from a line buffer associated with the coding tree unit; otherwise, the electronic apparatus decodes, from the video bitstream, the corresponding syntax element for the current coding unit based, at least in part, on a default value assigned to the syntax element associated with the above coding unit.