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JPEG/MPEG Decoder-Compatible Optimized Thresholding for Image and Video Signal Compression

Summary

Lead Inventors: Kannan Ramchandran, PhD, Martin Vetterli, PhD, Yanbin Yu PhD, Dimitris Anastassiou, PhDProblem or Unmet Need:Good compression when using JPEG and MPEG decoders results from determining an optimal thresholding strategy for the DCT (discrete cosine transform) coefficients. Thresholding, or dropping, the less significant DCT coefficients, while having a marginally negative impact on coded quality, could result in a significant reduction in coding bit rate as fewer coefficients would need to be transmitted. However, determining which DCT coefficients to drop and maintain decoder compatibility can be problematic.The technology comprises an optimal algorithm that uses a fast dynamic programming recursive structure. This novel low complexity dynamic programming method exploits the monotonic nature of bit rate versus zero run-length characteristics of JPEG and MPEG standards.

Technology Benefits

Optimizes the encoder thresholding operation while maintaining compatibility with standard JPEG and MPEG decoders.

Technology Application

The optimization of delivered coding quality and signal-to-noise ratio for JPEG and MPEG while maintaining compatibility with existing decoders.

Detailed Technology Description

The technology comprises an optimal algorithm that uses a fast dynamic programming recursive structure. This novel low complexity dynamic programming method exploits the monotonic nature of bit rate versus zero run-length characteristics of JPE...

Country/Region

USA

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