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Fig. 3
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Illustration of the calculation of the approximations by the à trous algorithm applied to the central pixel (i, j) = (0, 0) for a filter of size 3 × 3. At each scale D0, D1, and D2 (from left to right), the pixels involved in the convolution with the filter to compute D1(0, 0), D2(0, 0), and D3(0, 0) are shown in black.
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