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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>
\b Example:
The \b Result will be a \b Compound of \b Edges or \b Wires from which you can explode the desired edges or wires.
In the example shown above the following snapshot was taken in the middle of the chart
\image html feature_detection_dlg.png
\image html feature_detection_dlg3.png
<b> Output type </b> :
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>