A reduced search vector quantizer for speech

Ramamoorthy, V.; Abdul-Jabbar, Safa S.

doi:10.1109/icassp.1986.1168610

Cited by 3 publications

(2 citation statements)

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“…(7) From these equations, it is apparent that the decoder operation is a portion of the encoder operation. This fact is reminiscent of the well-known DPCM structure.…”

Section: (6)mentioning

confidence: 98%

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Side match and overlap match vector quantizers for images

Kim

1992

IEEE Trans. on Image Process.

250

104

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A class of vector quantizers with memory that are known as finite state vector quantizers (FSVQs) in the image coding framework is investigated. Two FSVQ designs, namely side match vector quantizers (SMVQs) and overlap match vector quantizers (OMVQs), are introduced. These designs take advantage of the 2-D spatial contiguity of pixel vectors as well as the high spatial correlation of pixels in typical gray-level images. SMVQ and OMVQ try to minimize the granular noise that causes visible pixel block boundaries in ordinary VQ. For 512 by 512 gray-level images, SMVQ and OMVQ can achieve communication quality reproduction at an average of 1/2 b/pixel per image frame, and acceptable quality reproduction. Because block boundaries are less visible, the perceived improvement in quality over ordinary VQ is even greater. Owing to the structure of SMVQ and OMVQ, simple variable length noiseless codes can achieve as much as 60% bit rate reduction over fixed-length noiseless codes.

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“…(7) From these equations, it is apparent that the decoder operation is a portion of the encoder operation. This fact is reminiscent of the well-known DPCM structure.…”

Section: (6)mentioning

confidence: 98%

“…For SMVQ and OMVQ, we propose a family of simple variable length noiseless codes that closely achieve the channel symbol entropies. This noiseless coding idea can also be applied to other FSVQ designs such as the nearest-neighbor design and the conditional histogram design [7].…”

Section: Introduction Ector Quantization (Vq) Is An Attractivementioning

confidence: 99%