Extraction and selection of boundary level sets

Extraction and selection of boundary level sets:
The contour extraction was obtain by using the tools img2freeman with the following commands lines:
./converters/img2freeman -i /Users/kerautre/EnCours/DGtal/examples/samples/church.pgm -s 300 -R 100 5 255 > contours.fc -c 129 526 300
./visualisation/displayContours -i contours.fc –backgroundImage $DGtal/examples/samples/church.png –alphaBG 0.4 –outputFile church.pdf

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