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Indexing the output points of an LBVQ used for image transform coding

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2 Author(s)
Khataie, M. ; Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada ; Soleymani, M.R.

A new method for indexing the points of a lattice-based vector quantizer (LBVQ) used to quantize the DCT coefficients of images is presented. With this method, a large number of lattice points can be selected as codewords. As a result, the quality of the compressed data can be very high. The problem is that the large number of points results in a high bit rate. To reduce the bit rate, a shorter representation is assigned to the more frequently used lattice points. These points are grouped and a prefix code is used to index these lattice points. Our method outperforms JPEG, particularly, in the case of images with high frequency components

Published in:

Image Processing, IEEE Transactions on  (Volume:9 ,  Issue: 5 )