Non-Frame-Edge Block Compression Using Simplified Prediction Modes
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Solution Overview
Problem
Current data compression techniques for image frames, such as the H.264 standard, do not effectively reduce the number of bits required to represent non-frame-edge blocks, limiting the efficiency of compression.
Innovation Solution
The approach involves using fewer bits to indicate the prediction mode for non-frame-edge blocks by recognizing the subset of available prediction modes and applying complementary decoding techniques, which allows for enhanced compression by reducing the number of bits needed to represent these blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If standard prediction modes are used for all blocks, then compression coverage is complete, but bit usage is excessive for non-frame-edge blocks
Solution Approach 1:
The patent applies different prediction mode representations based on block location: frame-edge blocks use standard prediction mode indicators while non-frame-edge blocks use a simplified representation. This local differentiation reduces bit usage for the majority of blocks (non-frame-edge) without affecting the accuracy of edge block reconstruction.
Solution Approach 2:
The patent segments the image frame into frame-edge blocks and non-frame-edge blocks, applying different compression strategies to each segment. Non-frame-edge blocks are processed with a simplified prediction mode indication that uses fewer bits, while frame-edge blocks retain full prediction mode specification.
2Loss of information
If fewer bits are used for non-frame-edge blocks, then compression is enhanced, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary classification of blocks into frame-edge and non-frame-edge categories during encoding. This pre-processing step enables the decoder to apply appropriate reconstruction methods based on block location, simplifying the decoding process compared to handling variable-length prediction mode indicators for all blocks.
Solution Approach 2:
The patent introduces an intermediary classification mechanism that determines whether a block is frame-edge or non-frame-edge based on its position. This intermediary step bridges the simplified compression representation and the full reconstruction process, enabling efficient decoding without requiring complex variable-length parsing.
Data Source
AI summary
Using fewer bits to indicate the prediction mode used for encoding some of the non-frame-edge blocks of a frame. In an embodiment, fewer bits are used in case of boundary blocks of a slice, or slice group. In another embodiment, fewer bits are used when adjacent blocks are encoded using inter-frame coding or switchable intra-frame coding and such adjacent block cannot be used in predicting a block.