Non-subsampled Video Encoding for H.264 Color Space Conversion
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Solution Overview
Problem
Conventional image compression techniques, such as the H.264 standard, incur significant losses due to down sampling from R′G′B′ to Y′CrCb color space and subsequent encoding, leading to compounded data loss during image rendering and transmission.
Innovation Solution
Implementing non-subsampled encoding and decoding techniques by converting R′G′B′ data into separate Y′, Cb, and Cr planes, where the Y′-plane is set to be three times taller and the Cb and Cr planes are set to 128, using the H.264 standard for encoding and decoding, thereby avoiding subsampling losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If down sampling from R'G'B' to Y'CrCb color space is applied, then data volume is reduced, but image quality deteriorates due to subsampling losses
Solution Approach 1:
The patent extracts only the essential luminance information (Y' plane) for compression while discarding the chrominance planes (Cr and Cb) that cause quality loss. By setting chroma_sampled_width and chroma_sampled_height to 1, the invention separates the useful luminance data from the problematic chrominance data, allowing compression without subsampling artifacts.
Solution Approach 2:
The patent changes the sampling parameters of the Y'CrCb color space by setting chroma_sampled_width and chroma_sampled_height to 1, effectively converting from 4:2:2 or 4:2:0 subsampling to a non-subsampled representation. This parameter change allows the Y' plane to be processed at full resolution while minimizing the impact of chrominance data.
2Productivity
If H.264 encoding is applied to compressed data, then transmission efficiency is improved, but compression loss increases
Solution Approach 1:
The patent segments the Y'CrCb data into separate planes and applies different processing to each. The Y' plane is encoded with full resolution and appropriate compression settings, while the chrominance planes are set to minimum sampling (1x1). This segmentation allows the critical luminance information to be preserved while reducing overall data volume for efficient transmission.
Solution Approach 2:
The patent applies different quality levels to different color planes: the Y' plane maintains high quality with full resolution encoding, while the Cr and Cb planes use minimal sampling. This local quality approach ensures that the most visually important information (luminance) is preserved while allowing compression of less critical chrominance data.
3Manufacturing precision
If multiple color planes (Y', Cr, Cb) are encoded separately, then color information is preserved, but data complexity increases
Solution Approach 1:
The patent merges the processing of multiple color planes into a unified encoding framework. By using the same H.264 encoding parameters for all planes and setting chroma_sampled_width/height to 1, the invention simplifies the data structure while maintaining separate color plane information. This merging approach reduces the complexity of handling multiple planes with different processing requirements.
Data Source
AI summary
Techniques for non-subsampled video encoding of R′G′B′ data using Y′, Cb and Cr data to generate compressed data wherein the Y′-plane comprises three separate color frames that are not interleaved, and recovering the data therefrom.