BDPCM Intra Prediction for Lower-Bitrate Image Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to an increase in transmission and storage costs due to the rise in the amount of transmitted information or bits, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus using Block Difference Pulse Code Modulation (BDPCM) that determines a prediction direction based on intra prediction mode or block size, efficiently signaling BDPCM-related information, and encoding residual signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent extracts and transmits only the residual signal (difference between original and predicted blocks) rather than the complete high-resolution image data. By separating the prediction component (which can be reconstructed from reference blocks) from the residual component (which contains the unique information), the system reduces the amount of data that needs to be transmitted while preserving image quality.
Solution Approach 2:
The patent segments the image data into multiple blocks and processes each block independently using intra-prediction and residual coding. This segmentation allows for efficient compression by applying different coding strategies to different regions, reducing the overall data transmission requirement while maintaining high-quality reconstruction.
2Productivity
If BDPCM is applied to all intra-predicted blocks, then encoding efficiency is improved, but bitstream complexity increases
Solution Approach 1:
The patent applies BDPCM selectively to only those intra-predicted blocks that benefit from it, rather than to all blocks. The encoder determines whether a block is suitable for BDPCM based on prediction mode and block characteristics, applying the technique partially where it provides the most compression benefit while avoiding unnecessary complexity in blocks where it would not be effective.
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.