Hybrid Mode Coding for Image Signal Prediction Accuracy
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Solution Overview
Problem
The current High Efficiency Video Coding (HEVC) standard has limitations in prediction accuracy due to the use of only one prediction method (intra or inter) for each coding block, and restricted prediction modes for inter and intra predictions.
Innovation Solution
An image signal encoding/decoding method that allows for hybrid mode coding, where a coding block can be divided into multiple prediction blocks, and prediction samples are generated using a combination of intra, inter, DMID, and DIMD modes based on the coding mode information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only one prediction method (intra or inter) is used for each coding block in HEVC, then the device complexity is reduced, but the prediction accuracy deteriorates
Solution Approach 1:
The current coding block is divided into multiple prediction blocks, allowing different prediction methods to be applied to different sub-regions. This segmentation enables the system to achieve higher overall prediction accuracy by selecting the most appropriate prediction method for each local region while maintaining manageable complexity through localized processing.
Solution Approach 2:
The patent introduces hybrid mode that dynamically selects and combines multiple prediction methods (intra, inter, DMID, DIMD) based on the characteristics of each coding block and prediction block. This dynamic adaptation allows the system to optimize prediction accuracy for different content types without requiring manual configuration, resolving the contradiction between accuracy and complexity.
2Measurement precision
If HEVC allows only AMVP mode, merge mode, and skip mode for inter prediction, then the device complexity is reduced, but the prediction accuracy deteriorates
Solution Approach 1:
The patent creates a universal prediction framework where a single coding block can utilize multiple prediction modes (AMVP, merge, skip, intra, DMID, DIMD) through the hybrid mode mechanism. This multi-functional approach allows the system to adapt to various prediction scenarios within a unified structure, improving both accuracy and flexibility without requiring separate dedicated systems for each mode.
Solution Approach 2:
The hybrid mode acts as a composite structure that integrates multiple prediction modes into a unified prediction mechanism. Similar to composite materials combining different substances for enhanced properties, the hybrid mode combines multiple prediction algorithms to achieve superior prediction accuracy while maintaining a single cohesive interface for encoding and decoding operations.
3Measurement precision
If HEVC allows only planar mode, DC mode, and angular mode for intra prediction, then the device complexity is reduced, but the prediction accuracy deteriorates
Solution Approach 1:
By dividing the coding block into multiple prediction blocks, the system can apply different intra prediction modes (planar, DC, angular, and newly introduced DMID/DIMD) to different regions. This localized application of prediction modes improves accuracy for complex intra-block patterns while keeping the overall processing complexity manageable through region-based processing.
Solution Approach 2:
The patent introduces new prediction modes (DMID and DIMD) that expand the parameter space of intra prediction beyond the traditional planar, DC, and angular modes. These additional modes provide more degrees of freedom for modeling complex intra-block variations, improving prediction accuracy while the encoder selectively applies them based on content characteristics to control processing complexity.
Data Source
AI summary
Disclosed are an image encoding/decoding method and apparatus. The image decoding method includes decoding coding mode information of a current coding block, dividing the current coding block into at least one prediction block, and generating prediction samples of the at least one prediction block on the basis of the decoded coding mode, in which the coding mode information is information indicating any one mode among intra mode, inter mode, and hybrid mode.