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Based on the multi-dimensional matrix theory, this paper introduced four-dimensional (4D) model, and deduce the Walsh orthogonal transform in 4D nth-order matrix space. This method is used for color image coding. We obtained very good results. 4D nth-order matrix model can express 4D data in a unified mathematical model for processing. On one hand, it considers the high efficiency of classical matrix...
A new method to evaluate the quality of color images is proposed in this paper, i.e. DSF (definition, error sensitivity and objective fidelity), which would combine the definition, error sensitivity and objective fidelity through utilizing the vision properties of human eyes and redundant color information fully. For the existence of color redundancy and structural similarity between three different...
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