Image Coding With Planar CIIP Prediction Across Luma and Chroma
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Solution Overview
Problem
The increasing demand for high resolution and quality images leads to higher data volumes, increasing transmission and storage costs, necessitating improved image encoding/decoding techniques.
Innovation Solution
Applying combined inter intra prediction (CIIP) for both luma and chroma blocks, using intra prediction in the Planar mode, and weighting intra and inter prediction values to enhance encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high resolution and quality images are used, then image quality is improved, but data volume increases leading to higher transmission and storage costs
Solution Approach 1:
The patent combines inter prediction and intra prediction into a unified CIIP framework, merging two separate prediction mechanisms to work together. This allows the encoder to leverage both temporal (inter) and spatial (intra) correlations simultaneously, achieving better compression efficiency for high resolution images without proportionally increasing data volume
Solution Approach 2:
The patent introduces a CIIP mode flag and weighting parameters that dynamically adjust the contribution of intra and inter prediction components. By changing these parameters based on block characteristics, the system optimizes the balance between prediction accuracy and bitrate, maintaining image quality while controlling data volume
2Productivity
If combined inter intra prediction (CIIP) is applied to both luma and chroma blocks, then encoding efficiency is improved, but computational complexity increases
Solution Approach 1:
The patent applies CIIP selectively to different block types (luma and chroma) and different block sizes based on their specific characteristics. Not all blocks use CIIP mode - the encoder evaluates conditions and applies CIIP only where beneficial, reducing unnecessary computational complexity while maintaining encoding efficiency for appropriate blocks
Solution Approach 2:
The patent divides the encoding process into separate stages: deriving intra prediction values, deriving inter prediction values, and then combining them with weighting. This segmentation of the prediction process allows for optimized computation at each stage and enables parallel processing possibilities, managing computational complexity while achieving high encoding efficiency
Data Source
AI summary
Disclosed herein is an image encoding/decoding method and apparatus. The image decoding method includes deriving an intra prediction value by performing intra prediction with respect to a current block, deriving an inter prediction value by performing inter prediction with respect to the current block, deriving a combined inter intra prediction (CIIP) value by weighting the intra prediction value and the inter prediction value, and generating a reconstructed block of the current block using the CIIP value. The intra prediction is performed in a Planar mode.