Tile Copying for Video Compression Efficiency
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Solution Overview
Problem
Existing video compression techniques face challenges in efficiently encoding and decoding video data over limited bandwidth channels, particularly in reducing inter-tile redundancy and improving error resilience and parallelism, while maintaining high compression efficiency.
Innovation Solution
The method employs tile copying in video encoding and decoding, where tiles with similar content are identified and only the reference tile's information is stored, omitting redundant tile content, and using tile copying mode indicators and offsets to facilitate efficient transmission and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional video compression techniques are used, then video data can be transmitted and stored, but the compression efficiency is insufficient for limited bandwidth channels
Solution Approach 1:
The video frame is divided into multiple independent tiles, where each tile can be encoded and decoded independently. This segmentation allows the decoder to process multiple tiles in parallel, improving compression efficiency and reducing the impact of errors in one tile on others, thereby optimizing bandwidth utilization.
Solution Approach 2:
The patent implements tile copying by identifying identical or similar tiles within the same frame and storing only a reference to the original tile instead of duplicating its data. This significantly reduces redundant information storage and transmission requirements, directly improving compression efficiency for limited bandwidth channels.
2Productivity
If tile copying is implemented, then compression efficiency improves, but device complexity increases due to additional encoding and decoding operations
Solution Approach 1:
The encoder performs preliminary identification of identical tiles and inserts copy indicators into the bitstream before transmission. This preliminary action simplifies the decoder's task, as it only needs to follow the copy indicators rather than performing complex comparisons, thereby managing device complexity while maintaining compression efficiency.
Solution Approach 2:
By copying tile references instead of full tile data, the patent reduces the computational burden on both encoder and decoder. The copy operation involves storing and retrieving references rather than processing complete tile content, which manages complexity while achieving high compression ratios.
3Quantity of substance
If redundant tile content is omitted, then bandwidth utilization improves, but error resilience may be affected
Solution Approach 1:
By segmenting the frame into independent tiles with copy indicators, the patent ensures that errors in one tile do not propagate to other tiles. Each tile can be independently decoded or redecoded if needed, improving error resilience while maintaining efficient bandwidth utilization through selective copying.
Solution Approach 2:
The patent changes the representation parameter from full tile content to compact copy indicators. This parameter change reduces bandwidth requirements while the indicators themselves provide enough information to reconstruct tiles, maintaining reliability through the ability to request original tile data if errors occur.
4Productivity
If tile copying mode indicators are added to headers, then compression efficiency improves, but measurement precision requirements increase for decoding
Solution Approach 1:
The copy mode indicator is preliminarily embedded in the tile header during encoding, providing explicit instructions to the decoder about whether to copy or decode tile content independently. This preliminary marking simplifies the decoding process by eliminating the need for complex similarity detection, maintaining precision while improving efficiency.
Data Source
AI summary
Tile copying may include decoding a current frame from an encoded video bitstream by decoding, from the encoded video bitstream, tile information for a current tile of the current frame. Decoding the tile information for the current tile of the current frame includes decoding a reference tile offset, and the tile information for the current tile omits encoded tile content information corresponding to the current tile. From the encoded video bitstream, encoded tile content information corresponding to the reference tile is identified based on the reference tile offset, a decoded tile corresponding to the current tile is generated by decoding the encoded tile content information corresponding to the reference tile as the current tile, and the decoded tile is output or stored.