A Study on Pixel-wise Concurrent Calculation for Depth from Focus using Gray Level Variance

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  • 輝度偏差を用いたDepth form Focus 法の画素毎並列化の検討
  • キド ヘンサ オ モチイタ Depth form focusホウ ノ ガソ ゴト ヘイレツカ ノ ケントウ

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Abstract

Regarding Depth-from-Focus methods，which estimate the depth from a set of images taken by the different focus,a method，which uses the relation between the lumiuance value of a target pixel and the mean value of the neighboring pixels，and the relation follows Poisson distribution，has been proposed. However，the mean value is computed using different window sizes，so an enormous memory and computation time are rerequired. Additionally， in the calculation，box filtelring to compute the mean is used twice，so a target pixel has as trong relationship with the neighboring pixels，which makes it difficuIt.to perform pixel-by-pixel concurrent calculationfor redllcing the calculation time. In this paper，to address these problems，we consider modifying the image-wise calculation to the pixcl-wise calculation，and propose a method that replaces the calculation with one filtcring by approximating the formula. This can reduce the memory consumption and allows us to use pixel-wise concurrent calculation.

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