Scalable image coding using Gaussian pyramid vector quantisation with resolution-independent block size
نویسندگان
چکیده
We present a new approach to multiresolution vector quantisation. Its main advantage is exploitation of long-range correlations in the image by keeping vector size constant, independent of the image scale. We also developed a variable block-rate version of the algorithm, which allows better utilisation of the available bit budget by re ning only those areas of the image which are not e ciently approximated by lower resolutions of the pyramid.
منابع مشابه
Robust image and video coding with pyramid vector quantisation
Most current image and video coding standards use variable length codes to achieve compression, which renders the compressed bitstream very sensitive to channel errors. In this paper, image and video coders based on Pyramid Vector Quantisation (PVQ) and using only fixed length codes are proposed. Still image coders using PVQ in conjunction with DCT and wavelet techniques are described and their...
متن کاملRobust Image and Video Coding with Pyramid Vector Quantisation
Most current image and video coding standards use variable length codes to achieve compression, which renders the compressed bitstream very sensitive to channel errors. In this paper, image and video coders based on Pyramid Vector Quantisation (PVQ) and using only fixed length codes are proposed. Still image coders using PVQ in conjunction with DCT and wavelet techniques are described and their...
متن کاملScalable distributed speech recognition using Gaussian mixture model-based block quantisation
In this paper, we investigate the use of block quantisers based on Gaussian mixture models (GMMs) for the coding of Mel frequency-warped cepstral coefficient (MFCC) features in distributed speech recognition (DSR) applications. Specifically, we consider the multi-frame scheme, where temporal correlation across MFCC frames is exploited by the Karhunen–Loève transform of the block quantiser. Comp...
متن کاملA comparative study of LPC parameter representations and quantisation schemes for wideband speech coding
In this paper, we provide a review of LPC parameter quantisation for wideband speech coding as well as evaluate our contributions, namely the switched split vector quantiser (SSVQ) and multi-frame GMM-based block quantiser. We also compare the performance of various quantisation schemes on the two popular LPC parameter representations: line spectral frequencies (LSFs) and immittance spectral pa...
متن کاملAn Image Coding Scheme using Block Prediction of the Pyramid Subband Decomposition
In this work, we propose a hybrid vector quantization scheme for general images that aims at exploiting similarities among detail signals in a multiresolution decomposition of the image. In a multiresolution decomposition, the image is decomposed into a set of subbands which are localized in scale, orientation and space. Our coding scheme consists of dividing each subimage of the multiresolutio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997