Video Alpha Channel Compression via Segmented YUV Encoding
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Solution Overview
Problem
Current video codecs that support alpha channels struggle with compression efficiency, leading to suboptimal solutions where either alpha channel data is left uncompressed or conventional codecs without alpha channel support are used, resulting in less than ideal compression ratios.
Innovation Solution
A system and method that encodes RGB video data with premultiplied alpha channel data into a single stream using conventional YUV codecs, allowing for higher compression by separating the alpha channel data into a second track, utilizing a YUV codec that does not provide integrated alpha channel compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a video codec with integrated alpha channel support is used, then alpha channel data can be compressed, but the compression efficiency is poor compared to conventional codecs
Solution Approach 1:
The patent divides the video data into two separate tracks: one for RGB video data and one for alpha channel data. Each track is processed independently through the encoding pipeline, allowing conventional high-efficiency video codecs to be applied to both tracks separately, thereby achieving better overall compression than integrated approaches
Solution Approach 2:
The patent introduces YUV color space conversion as an intermediary step between RGB input and final compression. By converting RGB video and alpha channel data to YUV format separately, the system enables the use of optimized YUV-based video codecs on both tracks, improving compression efficiency while maintaining alpha channel functionality
2Loss of substance
If the alpha channel is placed in a separate uncompressed track, then video compression can be exceptionally high, but the overall compression is less than what would be possible if the alpha channel was compressed
Solution Approach 1:
The patent segments the data stream into two compressed tracks rather than one compressed video track and one uncompressed alpha track. Both tracks undergo independent compression using conventional codecs, ensuring that neither track remains uncompressed and thereby minimizing total data size while maintaining high compression efficiency
Solution Approach 2:
The patent applies YUV color space conversion and premultiplication operations to transform the data parameters before compression. These parameter changes optimize the data representation for compression algorithms, enabling both video and alpha channel data to achieve high compression ratios when encoded separately
3Loss of substance
If conventional YUV codecs are used without integrated alpha channel support, then higher compression is achieved, but alpha channel data requires separate processing
Solution Approach 1:
The patent segments the encoding process into two independent pipelines: one for RGB video data and one for alpha channel data. Each pipeline uses standard conventional YUV codecs without requiring modifications for alpha channel support, thereby maintaining high compression efficiency while managing complexity through modular independent processing
Solution Approach 2:
The patent makes the same conventional YUV codec serve dual purposes by applying it to both the video track and the alpha channel track separately. This universal application of standard codecs eliminates the need for specialized alpha channel compression logic, reducing device complexity while achieving high compression on both data types
Data Source
AI summary
A system and method receives video data and its corresponding alpha channel data using a single stream or file, each of the video data and alpha channel data in the same format, and decompresses each set of data using a single decompression algorithm.