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Trellis quantization

An algorithm that can improve data compression in DCT-based encoding methods.

Trellis quantization is an algorithm that can improve data compression in DCT-based encoding methods. It is used to optimize residual DCT coefficients after motion estimation in lossy video compression encoders such as Xvid and x264. Trellis quantization reduces the size of some DCT coefficients while recovering others to take their place. This process can increase quality because coefficients chosen by Trellis have the lowest rate-distortion ratio. Trellis quantization effectively finds the optimal quantization for each block to maximize the PSNR relative to bitrate. It has varying effectiveness depending on the input data and compression method.

Key Terms

algorithm
data compression dct based encoding methods
dct coefficients
lossy video compression encoders
quantization
residual dct coefficients motion estimation
size
trellis quantization
x264
xvid

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Synonymns

Trellis quantization
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Last modified on May 17 2020
Content adapted from Wikipedia
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