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The study is referred to a task of 2D data slope estimation. We consider the integral projections analysis technique and a common criterion of sum of squared values (SSV) for optimal angle detection. This criterion is dependent on the density of input data and for very sparse data its efficiency significantly decreases. We propose the alternative criteria – the sum of the inversed lengths (SIL) that preserves SSV characteristics for dense data but that is much more robust for sparse input. The experiments conducted on simulated and real datasets demonstrate better quality of slope detection using the proposed criterion.
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