Inter-Channel Codeword Encoding for Efficient Image Compression
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Solution Overview
Problem
Existing image compression techniques fail to exploit redundancies across different color channels, leading to inefficient compression and potential loss of information.
Innovation Solution
Implement inter-channel encoding of codewords by mapping quantized coefficients from multiple color channels into a single data structure and encoding it using lossless compression schemes, such as RLE, to group similar coefficients together for efficient compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional separate channel encoding is used, then encoding simplicity is maintained, but compression efficiency deteriorates due to unexploited inter-channel redundancies
Solution Approach 1:
The patent merges multiple color channel encoding operations into a single unified encoding process. Quantized coefficients from different color channels (Y, Cb, Cr) are combined into a single data structure and encoded together using lossless compression, allowing the encoder to exploit statistical dependencies and redundancies that exist across channels, thereby improving compression efficiency without requiring separate encoding operations for each channel
2Productivity
If lossy compression is used, then compression ratio improves, but information loss increases
Solution Approach 1:
The patent extracts and removes the lossy quantization step from the compression pipeline by applying lossless compression to the quantized coefficients. By using lossless encoding schemes on the already-quantized data, the method achieves high compression ratios while preserving all information that survived the quantization process, thus eliminating the additional information loss that would occur with lossy compression techniques
Data Source
AI summary
This disclosure provides methods, devices, and systems for image compression. The present implementations more specifically relate to image compression techniques that support inter-channel encoding of codewords. An encoder implementing an image compression operation may apply a spatial-frequency transform to a number (N) arrays of pixel values associated with N color channels, respectively, and may quantize the result to produce N arrays of quantized coefficients. In some aspects, the encoder may map each quantized coefficient of the N arrays of quantized coefficients to a data structure and may encode the data structure as one or more codewords associated with a lossless compression scheme. In some implementations, the mapping may arrange the quantized coefficients in the data structure in order of decreasing (or increasing) amplitude, independent of color channel.