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Generalized Lloyd algorithm (GLA) is one of the most well-known image compression algorithms for the codebook generation problem of vector quantization. However, it is usually extremely sensitive to the initial solution. Thus, this paper presents an enhanced method that leverages the strength of two methods to create a better initial solution for the codebook generation problem. The simulation results...
In the past, we proposed a time series segmentation approach by combining the clustering technique, the Discrete Wavelet Transformation (DWT) and the genetic algorithm to automatically find segments and patterns from a time series. In this paper, we propose a PIP-based evolutionary approach, which uses Perceptually Important Points (PIP) instead of DWT, to effectively adjust the length of subsequences...
This paper proposes a time series segmentation approach by combining the clustering technique, the discrete wavelet transformation and the genetic algorithm to automatically find segments and patterns from a time series. The genetic algorithm is used to find the segmentation points for deriving appropriate patterns. In the fitness evaluation, the proposed algorithm first divides subsequences in a...
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