Video Coder Block Split Policy Based on Aspect Ratio
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Solution Overview
Problem
Current video coding technologies face challenges in optimizing the block split policy for video frames, leading to increased complexity and bit overheads during transmission, which affects coding performance.
Innovation Solution
A method is proposed where the block split policy for a picture block is determined based on the size relationship between its width and height, with specific conditions defining whether to split and the direction of the split, allowing for conditional splitting and reduced bitstream overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If block-based video coding splits video frames into multiple picture blocks, then coding flexibility and adaptability improve, but split complexity and bit overheads increase
Solution Approach 1:
The patent changes the parameter of block aspect ratio (width-to-height ratio) to determine split policy. By classifying blocks into different aspect ratio ranges (e.g., horizontal, vertical, square blocks) and applying different default split policies to each category, the system achieves adaptive coding flexibility while reducing the complexity of split decision-making. Instead of evaluating all possible split directions uniformly, the aspect ratio parameter guides the selection of appropriate split strategies.
2Manufacturing precision
If block-based video coding splits picture blocks into smaller coding blocks, then coding precision improves, but bit overheads for transmitting split information increase
Solution Approach 1:
The patent applies different default split policies to different local regions (block types) based on their aspect ratios. Horizontal blocks use one default split policy, vertical blocks use another, and square blocks use a third. This localized approach allows the system to achieve high coding precision by adapting to local block characteristics while reducing bit overheads by avoiding the transmission of redundant split direction information for blocks where the default policy is already optimal.
3Loss of information
If conditional block split policy is applied based on aspect ratio, then bit overheads are reduced, but coding adaptability may be limited
Solution Approach 1:
The patent implements a dynamic split policy where the default split direction is not fixed but adapts based on the block's aspect ratio. The system dynamically selects among multiple default policies (horizontal split, vertical split, or no split) according to the block category. This dynamic approach maintains coding adaptability by allowing the split policy to respond to block characteristics while reducing bit overheads by establishing predictable default behaviors for different block types.
Data Source
AI summary
This application relates to the field of video coding technologies, and discloses a video coder and a corresponding method, to help improve video coding performance. In this application, encoding and decoding are collectively referred to as coding. A video coding method includes: determining a block split policy of a current picture block based on a size relationship between the width and the height of the current picture block; applying the block split policy to the current picture block to obtain a coding block; and reconstructing the obtained coding block to reconstruct the current picture block.