Large Macroblock Video Coding for High-Resolution Compression
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Solution Overview
Problem
Existing video encoding standards prescribe the use of 16×16 macroblocks, which are inefficient for high spatial resolution and frame rate video data, leading to increased redundancy and data transmission overhead.
Innovation Solution
Utilizing large macroblocks greater than 16×16 pixels, partitioning them into varying sizes and coding modes, and employing hierarchical coded block patterns to efficiently encode and decode video data, while selecting optimal macroblock sizes based on rate-distortion metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 16×16 macroblocks are used as prescribed by existing video encoding standards, then compatibility with existing standards is maintained, but compression efficiency for high spatial resolution and frame rate video data deteriorates
Solution Approach 1:
The patent implements dynamic macroblock size selection where the encoder can adaptively choose between 16×16 and larger macroblock sizes (e.g., 32×32, 64×64) based on the specific video content characteristics. This allows the system to maintain compatibility with existing standards while improving compression efficiency for high-resolution video through larger macroblocks when beneficial.
Solution Approach 2:
The patent changes the macroblock size parameter from a fixed 16×16 constraint to variable sizes including 16×16, 32×32, 64×64, and other larger configurations. This parameter modification enables the system to optimize compression performance for different video resolutions and frame rates while maintaining backward compatibility through the inclusion of standard-sized blocks.
2Productivity
If larger macroblocks are used to exploit redundancy in high-resolution video, then compression efficiency improves, but blocky artifacts increase
Solution Approach 1:
The patent segments the video picture into multiple macroblock types with different sizes, allowing fine-grained control over compression. By mixing 16×16, 32×32, and other sized macroblocks within the same picture, the system can exploit redundancy where beneficial while maintaining detail where needed, thus reducing blocky artifacts compared to uniform large macroblock usage.
Solution Approach 2:
The patent applies different macroblock sizes to different regions of the video picture based on local content characteristics. High-resolution regions with sufficient redundancy can use larger macroblocks for efficient compression, while regions requiring detail preservation use smaller macroblocks, thereby minimizing blocky artifacts overall.
3Loss of energy
If larger macroblocks are used to reduce data transmission overhead, then transmission efficiency improves, but coding complexity increases
Solution Approach 1:
The patent implements a dynamic macroblock size selection mechanism that adapts to video content characteristics. The encoder analyzes the video data and selectively chooses between 16×16 and larger macroblock sizes, which reduces the number of blocks that need to be coded and thus lowers transmission overhead, while the complexity is managed through adaptive rather than fixed large-block encoding.
Solution Approach 2:
The patent uses larger macroblocks partially - only when the video content and redundancy characteristics justify the increased block size. This partial application of large macroblocks reduces transmission overhead for suitable content while avoiding the full complexity burden of always using large blocks, achieving a balance between compression efficiency and coding complexity.
Data Source
AI summary
Techniques are described for encoding and decoding digital video data using macroblocks that are larger than the macroblocks prescribed by conventional video encoding and decoding standards. For example, the techniques include encoding and decoding a video stream using macroblocks comprising greater than 16×16 pixels. In one example, an apparatus includes a video encoder configured to encode a coded unit comprising a plurality of video blocks, wherein at least one of the plurality of video blocks comprises a size of more than 16×16 pixels and to generate syntax information for the coded unit that includes a maximum size value, wherein the maximum size value indicates a size of a largest one of the plurality of video blocks in the coded unit. The syntax information may also include a minimum size value. In this manner, the encoder may indicate to a decoder the proper syntax decoder to apply to the coded unit.