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DCC
1996
IEEE
13 years 10 months ago
Lapped Orthogonal Vector Quantization
The block processing inherent in the use of traditional vector quantization (VQ) schemes typically gives rise to perceptually distracting blocking artifacts. We demonstrate that s...
Henrique S. Malvar, Gary J. Sullivan, Gregory W. W...
ISCAS
1993
IEEE
115views Hardware» more  ISCAS 1993»
13 years 10 months ago
Improved Chen-Smith image coder
An image compression system based on transform coding and zonal sampling is presented. It is based on the wellknown Chen-Smith coder, but with an improved technique for transform ...
Eduardo M. Rubino, Henrique S. Malvar, Ricardo L. ...
ICIP
2005
IEEE
14 years 7 months ago
JPEG 2000 scalar quantization using an optimally frequency localized modulated lapped transform
JPEG 2000 is a lossy integer-to-integer transform-based compression method that first quantizes the separable 2-D wavelet transform coefficients, then entropy codes them. The imag...
Peter C. Tay, Joseph P. Havlicek
ICMCS
2006
IEEE
100views Multimedia» more  ICMCS 2006»
14 years 8 days ago
Nonlinearly-Adapted Lapped Transforms for Intra-Frame Coding
The use of block transforms for coding intra-frames in video coding may preclude higher coding performance due to residual correlation across block boundaries and insufficient en...
Dan Lelescu
DCC
2008
IEEE
13 years 6 months ago
Coding Overcomplete Representations of Audio Using the MCLT
We propose a system for audio coding using the modulated complex lapped transform (MCLT). In general, it is difficult to encode signals using overcomplete representations without ...
Byung-Jun Yoon, Henrique S. Malvar