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\f0\fs24 \cf0 As mentioned before, discretization of parameter space leads to some adverse effects. If value of tilting angle of normal can\'d5t be exactly presented in parameter space, then right line will broke up in few sets of parallel lines with approximated value of angle (pic. 2.13). We face same problem due to intrinsic curvature of contour, when fragment of contour isn\'d5t situated on line, but can be approximated by its means, or when contour is wider than one pixel; videlicet in every case, when points of contour don\'d5t lie on same line.\
The problem is impossibility of posing parameters of initial line by its fractions. Fortunately, at present step we already have information about segments\'d5 end points, so we can use it for \'e3gluing\'d3 segments into initial line.\
Fragments of initial line can be divided into 2 groups: first one \'d0 parallel lines with directions nearest to initial line\'d5s direction; and second group includes the rest. Lines which belongs to first group can be found easily, furthermore, they are much longer than other fragments. First group carries most important information, for this reason we can simply delete lines from second group.}