Sample signature after smoothing, (a), (b) are the horizontal and

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Sample signatures, (a), (c), (e) and (g) are genuine signatures

Signatures (a) and (c) before smoothing (b) and (d) after

Signatures (a) and (c) before smoothing (b) and (d) after

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Solar cycle - Wikipedia

J. Imaging, Free Full-Text

Advances in Test Equipment: Ultrafast optical sampling

a) An example input image (b) its histogram after smoothing by SG