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- W2146600015 abstract "In fractal image compression the encoding step is computationally expensive. A large number of sequential searches through a list of domains (portions of the image) are carried out while trying to find the best match for another image portion. Our theory developed here shows that this basic procedure of fractal image compression is equivalent to multi-dimensional nearest neighbor search. This result is useful for accelerating the encoding procedure in fractal image compression. The traditional sequential search takes linear time whereas the nearest neighbor search can be organized to require only logarithmic time. The fast search has been integrated into an existing state-of-the-art classification method thereby accelerating the searches carried out in the individual domain classes. In this case we record acceleration factors from 1.3 up to 11.5 depending on image and domain pool size with negligible or minor degradation in both image quality and compression ratio. Furthermore, as compared to plain classification our method is demonstrated to be able to search through larger portions of the domain pool without increased the computation time." @default.
- W2146600015 created "2016-06-24" @default.
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- W2146600015 date "2002-11-19" @default.
- W2146600015 modified "2023-09-30" @default.
- W2146600015 title "Accelerating fractal image compression by multi-dimensional nearest neighbor search" @default.
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- W2146600015 doi "https://doi.org/10.1109/dcc.1995.515512" @default.
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