Video Coding EIP Prediction for Luma and Chroma Efficiency
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Solution Overview
Problem
Conventional video coding techniques suffer from suboptimal coding gain and inefficiencies in signaling, transform, and chroma coding, necessitating improvements for enhanced performance and efficiency.
Innovation Solution
The implementation of an Extrapolation-based Intra Prediction (EIP) mode for both luma and chroma components in video units, including slope adjustments, gradient-based prediction, and extended multi-model linear models, to enhance coding efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional video coding techniques are used, then the coding process is simple, but the coding gain is suboptimal and performance is limited
Solution Approach 1:
The video unit is divided into multiple prediction blocks, and different prediction modes (intra, inter, EIP) are applied to different blocks based on their characteristics. This segmentation allows the system to achieve high coding gain in regions that benefit from EIP while maintaining simplicity in regions where conventional methods suffice, thus resolving the contradiction between coding gain and overall complexity.
Solution Approach 2:
The patent implements dynamic mode selection where the EIP mode is adaptively applied based on local video characteristics such as gradient magnitude and directional information. The decision to apply EIP is made dynamically for each video unit based on calculated metrics, allowing the system to achieve high coding gain only where necessary rather than universally, thus balancing performance improvement with computational complexity.
2Productivity
If EIP mode is applied to improve coding efficiency, then signaling and transform processes become more complex
Solution Approach 1:
The patent performs preliminary calculations of gradient magnitude and directional information before deciding whether to apply EIP mode. By pre-computing these metrics and establishing clear decision thresholds, the system prepares the necessary information in advance, making the subsequent EIP application process more efficient and reducing the overall signaling complexity despite the additional processing steps.
Solution Approach 2:
The patent changes key parameters such as gradient threshold values and directional angle ranges to control when EIP mode is activated. By adjusting these parameters based on video content characteristics, the system optimizes coding efficiency while maintaining manageable signaling complexity, as the parameter changes provide a simple control mechanism for the complex EIP process.
3Productivity
If conventional chroma coding is used, then the processing is straightforward, but performance and efficiency are suboptimal
Solution Approach 1:
The patent extends the EIP mode to work with both luma and chroma components using the same fundamental extrapolation filter mechanism. This universal approach allows the system to improve chroma coding efficiency with the same technical framework used for luma, avoiding the need for separate complex chroma-specific processing while achieving enhanced performance for both color components.
Data Source
AI summary
Embodiments of the disclosure provide a solution for video processing. A method for video processing is proposed. The method includes: applying, for a conversion between a video unit of a video and a bitstream of the video, an EIP mode to the video unit, where the EIP mode is applied to at least one of: a luma component or a chroma component; and performing the conversion based on the EIP mode.