Autodesk 00126-050008-1630A User Guide - Page 193

13 Vectorization polyline. The longer segments are not added to the polyline. This allows you, for example, to trace on maps curved isolines that are crossed by coordinate lines; the algorithm automatically stops on intersections of traced isoline with long straight line of grid. .The algorithm traces raster lines with a widths less than the value of the Max width parameter. The Max break parameter sets the maximum length of ignored raster segments break. The Approximation parameter sets the accuracy of approximation of raster segments by vector polyline. Outlines This algorithm is used to approximate outlines of flooded areas by polylines. This algorithm creates closed polylines, approximating the boundaries of raster objects. The boundary polylines consist only of straight segments. The figure shows the results of vectorization with the Outlines algorithm only. The original raster fragment is on the left; the right figure illustrates the results of vectorization. This algorithm is controlled by the following options of the Options tab: The algorithm traces raster lines whose width is greater than the value of the Min width parameter. To obtain outlines of all raster objects, you only need to choose outlines with the Max Width parameter to 0. The Approximation parameter sets the accuracy of raster segments approximated by vector outlines. Hatches Selects the algorithm for hatch recognition. WiseImage Pro recognizes simple raster hatches and creates AutoCAD blocks, consisting of segments. The simple raster hatch is a set of parallel raster lines. The Hatches algorithm searches for hatches only if the Lines algorithm is also on. The accepted angles of raster lines forming raster hatches are used as additional parameters. Text Areas Selects the algorithm for text recognition. WiseImage Pro distinguishes areas on the image with raster text strings and applies the additional parameters. The setting up of raster text string search options and the OCR module is carried out in the Texts tab of the same dialog box. The setting up procedure is described later in this chapter. None - does not vectorize raster text. Areas, containing raster text strings are ignored. Text Areas - creates rectangles bounding raster texts. These areas are not vectorized. Vector texts can be entered manually with the help of the review and correction procedure of recognized texts described below in this 199