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rnc 2012-04-17 14:33:13 +00:00
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doc/salome/gui/GEOM/input/shape_recognition.doc
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@ -19,6 +19,8 @@ Detection of the cost line on a nautical chart
\image html contour_detection_example2.png
\n
To use the <b>Shape recogition</b> tool:
<ol>
@ -43,22 +45,29 @@ To create <b>Contours</b> :
<li> Find a zone in the picture which color is representative of the zone you want to find the frontier of. Draw a rectangle on it to take a <b>Snapshot</b>.</li>
<li> Apply </li>
The \b Result will be a \b Compound of \b Edges or \b Wires from which you can explode the desired edges or wires.
\image html feature_detection_dlg.png
\b Example:
<b> Output type </b> :
In the example shown above the following snapshot was taken in the middle of the chart
\image html feature_detection_dlg3.png
All the violet and white areas are thus considered as part of the zone we want to find the frontier of.
<li> <b> Output type </b>
<ul>
<li> \b Spline : each contour will be a single \b edge based on a B-Spline curve</li>
<li> \b Spline : The \b result will be a \b Compound of \b Edges. Each contour will be a single \b edge based on a B-Spline curve (it will be smooth).</li>
<li> \b Polyline : each contour will be a wire made of lines (i.e. a \b Polygon)</li>
<li> \b Polyline : The \b result will be a \b Compound of \b Wires. Each contour will be a wire made of lines (i.e. a \b Polygon)</li>
</ul>
In both cases each contour can then be retrieved by an explode operation with the appropriate subshape type.
</li>
\note It's better to use the \b Spline output type unless you want to find the frontier of a polygon (rectangle ...)
</ol>