| http://www.w3.org/ns/prov#value | - For every collected image a Gaussian curve is fitted to this distribution and the threshold required for signal is calculated as a multiplicity of the dispersion value (), typically .Figure 2: Sky image before (a) and after (b) applying the laplace filter, and the distribution of pixel values after laplace filter is applied (c).Several types of filters which were tested are shown in Figure 1.
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