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
