| http://www.w3.org/ns/prov#value | - ortions that the picture to be evaluated is a background and/or spurious signal and other signals are filtered and/or intensified; digitized the picture; processing the picture with a computer to produce a binary picture of any cracks present; deriving a blurred background picture from the picture shades converted to digitized grey shade levels; subtracting the blurred background picture from the
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