BDPCM Residual Coding Signaling for Image Compression
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in the amount of transmitted and stored information, resulting in higher transmission and storage costs, necessitating the development of high-efficient image compression technologies.
Innovation Solution
An image encoding/decoding method and apparatus that employs block-based delta pulse code modulation (BDPCM) to determine the residual coding method for transform blocks, enabling efficient encoding and decoding by signaling the residual coding method, thereby improving encoding/decoding efficiency and facilitating the transmission of bitstreams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted and stored, then image quality is improved, but transmission and storage costs increase
Solution Approach 1:
The image data is divided into transform blocks, and residual coding is applied selectively to each block based on BDPCM applicability. This segmentation allows efficient compression by treating different blocks differently - applying transform skip to blocks where BDPCM is applicable and regular transform to others, optimizing the balance between quality and compression ratio
Solution Approach 2:
The patent changes the coding parameter (residual coding method) based on the applicability of BDPCM to each transform block. By signaling a residual coding method flag and selecting between transform skip and regular transform, the system dynamically adjusts coding parameters to achieve better compression efficiency while maintaining image quality
2Device complexity
If residual coding method is not signaled for BDPCM blocks, then device complexity is reduced, but encoding efficiency deteriorates
Solution Approach 1:
The patent enables the decoding device to self-determine the residual coding method by checking whether BDPCM is applicable to each transform block. The decoder uses the same BDPCM applicability determination logic as the encoder, allowing it to automatically select the correct decoding method without explicit signaling, thus reducing overhead while maintaining encoding efficiency
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise determining a residual coding method of a current transform block corresponding to a current coding block, reconstructing residual information of the transform block based on the determined residual coding method and reconstructing the current transform block based on the residual information.