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In 2007, Chang et al. proposed a reversible data hiding scheme for secret communication that hides secret information in the compression codes of a cover image, but their scheme has low hiding capacity and introduces extra m bits to reverse the original vector quantization (VQ) index of the cover image after the secret data are extracted. Instead of introducing m bits (where the size of the codebook...
Efficient quantization of the linear predictive coding (LPC) parameters plays a key role in parametric speech coding. The line spectral frequency (LSF) representation of the LPC parameters has found its applications in speech model quantization. In practical implementations of vector quantization (VQ), probability density function optimized VQ has been shown to be more efficient than the VQ based...
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