Estimates tangent using a binomial convolver.

Usage: tangentBC [options] –input <fileName>

Allowed options are :

-h [ --help ]              display this message
-i [ --input ] arg         input file name: FreemanChain (.fc) or a sequence of discrete points (.sdp).
-s [ --GridStep ] arg (=1) Grid step

Note: The file may contain several freeman chains.

Example:

We consider as input shape the freeman chain of the DGtal/examples/sample directory. The contour can be displayed with displayContours :

$ displayContours -i $DGtal/examples/samples/contourS.fc -o contourS.png --drawPointOfIndex 0

The tangents can be computed as follows:

$ tangentBC -i $DGtal/examples/samples/contourS.fc  > tangentsBC.dat
$ gnuplot 
gnuplot> plot [] [-1.2:1.2]'tangentsBC.dat' using 1:3  w lines title "tangents with Binomial Convolution estimator"

You should obtain such a result:

contour	curvature

CCW oriented (index 0=blue pt)	resulting tangent (angle)

See also: tangentBC.cpp