DGtal 1.3.0
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This example a simple alpha-thick segment recognition given from a freeman chain contour.

See also
Alpha-thick Segment Recognition
Simple example of some alpha-thick segments recognition with alpha = 2, 5 and 15.
#include <iostream>
#include "ConfigExamples.h"
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/base/Common.h"
#include "DGtal/geometry/curves/AlphaThickSegmentComputer.h"
#include "DGtal/io/boards/Board2D.h"
#include "DGtal/io/readers/PointListReader.h"
using namespace std;
using namespace DGtal;
int main( )
trace.beginBlock ( "Example exampleAlphaThickSegment" );
typedef AlphaThickSegmentComputer< Z2i::Point, FCConstIterator > AlphaThickSegmentComputer2D;
Board2D aBoard;
// Reading input contour
std::string freemanChainFilename = examplesPath + "samples/contourS.fc";
fstream fst;
fst.open (freemanChainFilename.c_str(), ios::in);
aBoard << fc;
//construction of an AlphaThickSegmentComputer2D from the freemanchain iterator
AlphaThickSegmentComputer2D anAlphaSegment(15), anAlphaSegment2(5), anAlphaSegment3(2);
while (anAlphaSegment.end() != fc.end() &&
anAlphaSegment.extendFront()) {
aBoard << anAlphaSegment;
// Example of thickness definition change: usin the euclidean thickness definition.
AlphaThickSegmentComputer2D anAlphaSegment2Eucl(5, functions::Hull2D::EuclideanThickness);
while (anAlphaSegment2Eucl.end() != fc.end() &&
anAlphaSegment2Eucl.extendFront()) {
aBoard << CustomStyle( anAlphaSegment2Eucl.className(),
new CustomColors( DGtal::Color(20, 250, 255), DGtal::Color::None ) );
aBoard << anAlphaSegment2Eucl;
while (anAlphaSegment2.end() != fc.end() && anAlphaSegment2.extendFront()) {
aBoard << CustomStyle( anAlphaSegment2.className(), new CustomColors( DGtal::Color::Blue, DGtal::Color::None ) );
aBoard << anAlphaSegment2;
FCConstIterator fcIt = fc.begin();
while (anAlphaSegment3.extendFront(*fcIt)) {
aBoard << CustomStyle( anAlphaSegment3.className(), new CustomColors( DGtal::Color::Green, DGtal::Color::None ) );
aBoard << anAlphaSegment3;
return 0;
// //
Aim: This class is devoted to the recognition of alpha thick segments as described in ....
Aim: This class specializes a 'Board' class so as to display DGtal objects more naturally (with <<)....
Definition: Board2D.h:71
Structure representing an RGB triple with alpha component.
Definition: Color.h:68
static const Color None
Definition: Color.h:412
static const Color Green
Definition: Color.h:417
static const Color Blue
Definition: Color.h:419
ConstIterator end() const
ConstIterator begin() const
void beginBlock(const std::string &keyword="")
double endBlock()
void saveEPS(const char *filename, PageSize size=Board::BoundingBox, double margin=10.0) const
Definition: Board.cpp:805
DGtal is the top-level namespace which contains all DGtal functions and types.
STL namespace.
Custom style class redefining the pen color and the fill color. You may use Board2D::Color::None for ...
Definition: Board2D.h:279
int main()
Definition: testBits.cpp:56