tangentBC

Estimates tangent using a binomial convolver.

Usage: tangentBC [options] –input <fileName>

Allowed options are :

Positionals:
1 TEXT:FILE REQUIRED                  input file name: FreemanChain (.fc) or a sequence of discrete points (.sdp).
 
Options:
-h,--help                             Print this help message and exit
-i,--input TEXT:FILE REQUIRED         input file name: FreemanChain (.fc) or a sequence of discrete points (.sdp).
--GridStep FLOAT=1                    Grid step (default 1.0)

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

The tangents can be computed as follows:

$ tangentBC $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