“School of Cognitive Sciences”
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Paper IPM / Cognitive Sciences / 7567  


Abstract:  
The kmeans algorithm is widely used to design image codecs using vector quantization (VQ). In this paper, we focus on an adaptive approach to implement a VQ technique using the online version of kmeans algorithm, in which the size of the codebook is adapted continuously to the statistical behavior of the image. Based on the statistical analysis of the feature space, a set of thresholds are designed such that those codewords corresponding to the lowdensity clusters would be removed from the codebook and hence, resulting in a higher bitrate efficiency. Applications of this approach would be in telemedicine, where sequences of highly correlated medical images, e.g. consecutive brain slices, are transmitted over a low bitrate channel. We have applied this algorithm on magnetic resonance (MR) images and the simulation results on a sample sequence are given. The proposed method has been compared to the standard kmeans algorithm in terms of PSNR, MSE, and elapsed time to complete the algorithm
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