ON THE SPLITTING METHOD FOR VECTOR QUANTIZATION CODEBOOK GENERATION

The well-known LEG algorithm uses binary splitting for generating an i nitial codebook, which is then iteratively improved by the generalized Lloyd algorithm (GLA). We study different variants of the splitting m ethod and its application to codebook generation with and without the GLA, A new iterative splitting method is proposed, which is applicable to codebook generation without the GLA, Experiments show that the imp roved splitting method outperforms both the GLA and the other existing splitting-based algorithms, The best combination uses hyperplane part itioning of the clusters along the principal axis as proposed by Wu an d Zhang, integrated with a local repartitioning phase at each step of the algorithm. (C) 1997 Society of Photo-Optical Instrumentation Engin eers.