/usr/include/visp/vpMoment.h is in libvisp-dev 2.8.0-4.
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*
* $Id: vpMoment.h 4219 2013-04-17 10:00:56Z mbakthav $
*
* This file is part of the ViSP software.
* Copyright (C) 2005 - 2013 by INRIA. All rights reserved.
*
* This software is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* ("GPL") version 2 as published by the Free Software Foundation.
* See the file LICENSE.txt at the root directory of this source
* distribution for additional information about the GNU GPL.
*
* For using ViSP with software that can not be combined with the GNU
* GPL, please contact INRIA about acquiring a ViSP Professional
* Edition License.
*
* See http://www.irisa.fr/lagadic/visp/visp.html for more information.
*
* This software was developed at:
* INRIA Rennes - Bretagne Atlantique
* Campus Universitaire de Beaulieu
* 35042 Rennes Cedex
* France
* http://www.irisa.fr/lagadic
*
* If you have questions regarding the use of this file, please contact
* INRIA at visp@inria.fr
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*
* Description:
* Base for 2D moment descriptor
*
* Authors:
* Filip Novotny
*
*****************************************************************************/
/*!
\file vpMoment.h
\brief Base class for all 2D moments.
*/
#ifndef __MOMENT_H__
#define __MOMENT_H__
#include <visp/vpConfig.h>
#include <vector>
#include <iostream>
class vpMomentDatabase;
class vpMomentObject;
/*!
\class vpMoment
\ingroup TrackingMoments
\brief This class defines shared methods/attributes for 2D moments.
All moments or combination of moments in the moments module are based on this class.
A moment uses a vpMomentObject object to access all useful information.
Moment values are obtained by a 4-step process common for all moment types:
- Declaration.
\code
vpMoment moment;
\endcode
- Update with object.
\code
moment.update(object);
\endcode
- Compute the moment value
\code
moment.compute();
\endcode
- Access the values:
\code
std::vector<double> values = moment.get();
\endcode
A moment may also be linked to a vpMomentDatabase. Moments linked to a database are able to access each others values.
Some moments can be computed only if they are linked to a a database containing their dependencies.
Linking to a database is done using the vpMoment::linkTo(...) method.
There are no constraints about format of the array returned by vpMoment::get: any implementation is fine.
Each moment must have a string name by implementing the char* vpMoment::name() method which allows to identify the moment in the database.
Each moment must also implement a compute method describing how to obtain its values from the object.
\attention Order of moment computation DOES matter: when you compute (vpMoment::compute call) a moment, all moment dependencies must be computed.
Moments pre-implementes dans ViSP:
- vpMomentAlpha
- vpMomentBasic
- vpMomentCentered
- vpMomentCInvariant
- vpMomentSInvariant
- vpMomentAreaNormalized
*/
class VISP_EXPORT vpMoment{
private:
vpMomentObject* object;
vpMomentDatabase* moments;
char _name[255];
protected:
std::vector<double> values;
/*!
Returns the linked moment database.
\return the moment database
*/
inline vpMomentDatabase& getMoments(){ return *moments; }
public:
inline vpMomentObject& getObject() const { return *object;}
vpMoment();
/*!
Returns all values computed by the moment.
\return vector of values
*/
std::vector<double>& get(){ return values;}
void linkTo(vpMomentDatabase& moments);
void update(vpMomentObject& object);
virtual void compute()=0;
virtual const char* name() = 0;
friend VISP_EXPORT std::ostream & operator<<(std::ostream & os, const vpMoment& m);
/*!
Virtual destructor.
*/
virtual ~vpMoment() {}
};
#endif
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