Video Intra Mode Coding With Segmented Mode Indication
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Solution Overview
Problem
Existing video coding technologies face inefficiencies in intra prediction mode coding, particularly in handling the increasing number of intra prediction directions, leading to suboptimal bit usage and compression ratios.
Innovation Solution
The method involves dividing a list of intra modes into sets based on neighboring block modes and extracting a set index and mode index from the coded video bitstream to determine the intra prediction mode, optimizing the coding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of intra prediction directions is increased to improve prediction accuracy, then the coding efficiency deteriorates due to increased bit usage
Solution Approach 1:
The patent divides the list of intra prediction modes into multiple subsets, where each subset contains a limited number of modes. The decoder first receives indication information to identify which subset is used, then selects the specific prediction mode from that subset. This segmentation reduces the immediate coding complexity and bit usage for mode indication while maintaining access to a comprehensive set of prediction directions.
Solution Approach 2:
The patent introduces a two-level indication mechanism: first indicating the subset index (first dimension) and then indicating the mode index within that subset (second dimension). This dimensional approach allows the system to manage a large number of prediction modes more efficiently by distributing the indication across multiple levels rather than using a single large index.
2Productivity
If more intra prediction modes are supported to improve compression ratio, then the device complexity increases
Solution Approach 1:
By segmenting the intra prediction modes into subsets, the patent reduces the complexity of mode selection and indication. The decoder only needs to manage and process the modes within the indicated subset at any given time, rather than handling all modes simultaneously, thereby reducing device complexity while supporting a comprehensive set of prediction directions.
Solution Approach 2:
The patent performs preliminary organization of intra prediction modes into subsets before the actual decoding process. This pre-arranged structure allows the decoder to quickly identify and access the relevant subset based on the received indication information, reducing the real-time processing complexity and improving decoding efficiency.
Data Source
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AI summary
Methods, apparatus, and computer readable storage medium for intra prediction mode coding in video decoding. The method includes receiving, by a device, a coded video bitstream for a block, and also includes dividing, by the device, a list of intra modes into a plurality of intra mode sets for the block based on mode information of each intra mode in the list; extracting, by the device from the coded video bitstream, a set index; extracting, by the device from the coded video bitstream, a mode index indicating an intra prediction mode from the intra mode set; and determining, by the device, the intra prediction mode for the block based on the set index and the mode index.