/usr/include/x86_64-linux-gnu/visp3/core/vpHistogram.h is in libvisp-core-dev 3.0.0-4.
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*
* This file is part of the ViSP software.
* Copyright (C) 2005 - 2015 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://visp.inria.fr for more information.
*
* This software was developed at:
* Inria Rennes - Bretagne Atlantique
* Campus Universitaire de Beaulieu
* 35042 Rennes Cedex
* France
*
* 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:
* Gray level histogram manipulation.
*
* Author:
* Fabien Spindler
*
*****************************************************************************/
/*!
\file vpHistogram.h
\brief Declaration of the vpHistogram class.
Class vpHistogram defines gray level image histograms
*/
#ifndef vpHistogram_h
#define vpHistogram_h
#include <sstream>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpHistogramPeak.h>
#include <visp3/core/vpHistogramValey.h>
#include <visp3/core/vpColor.h>
#ifdef VISP_BUILD_DEPRECATED_FUNCTIONS
# include <visp3/core/vpList.h>
#endif
#include <list>
/*!
\class vpHistogram
\ingroup group_core_histogram
\brief Class to compute a gray level image histogram.
Here are two examples showing how to use this class to determine the
threshold which can be used to segment two objects.
The code below:
\code
vpImage<unsigned char> I;
...
unsigned char dist = 60;
vpHistogramValey valey;
vpHistogram h(I);
h.smooth(); // Filter the histogram values
vpHistogramPeak peakl, peakr; // Two highest peaks in the histogram
// - peakl: Peak on the left
// - peakr: Peak on the right
h.getPeaks(dist, peakl, peakr, valey);
unsigned char threshold; // Position of the valey between the two peaks
threshold = valey.getLevel();
\endcode
has the same behaviour than this one:
\code
vpImage<unsigned char> I;
...
unsigned char dist = 60;
vpHistogram h(I);
h.smooth(); // Filter the histogram values
vpHistogramPeak peak1, peak2; // Two highest peaks in the histogram
// - peak1: Highest peak
// - peakr: Second highest peak
// Get the two highest peaks
h.getPeaks(dist, peak1, peak2);
// Get the valey between the two highest peaks
vpHistogramValey valey;
h.getValey(peak1, peak2, valey);
unsigned char threshold; // Position of the valey between the two peaks
threshold = valey.getLevel();
\endcode
*/
class VISP_EXPORT vpHistogram
{
public:
vpHistogram();
vpHistogram(const vpHistogram &h);
vpHistogram(const vpImage<unsigned char> &I);
virtual ~vpHistogram();
vpHistogram & operator=(const vpHistogram &h);
/*!
Return the number of pixels having the gray \e level.
\param level : Gray level in the histogram.
\return Number of pixels having the gray level.
\code
vpImage<unsigned char> I; // A gray level image
vpHistogram h;
h.calculate(I); // Histogram of the gray level image
// Print the histogram values
for (int i=0; i < h.getSize(); i ++)
printf("%d: %d\n", i, h[i]);
\endcode
*/
inline unsigned operator[](const unsigned char level) const
{
if (level < size) {
return histogram[level];
}
std::stringstream ss;
ss << "Level is > to size (" << size << ") !";
throw vpException(vpException::dimensionError, ss.str().c_str());
};
/*!
Return the number of pixels having the gray \e level.
\param level : Gray level in the histogram.
\return Number of pixels having the gray level.
\code
vpImage<unsigned char> I; // A gray level image
vpHistogram h;
h.calculate(I); // Histogram of the gray level image
// Print the histogram values
for (int i=0; i < h.getSize(); i ++)
printf("%d: %d\n", i, h(i));
\endcode
*/
inline unsigned operator()(const unsigned char level) const
{
if(level < size) {
return histogram[level];
}
std::stringstream ss;
ss << "Level is > to size (" << size << ") !";
throw vpException(vpException::dimensionError, ss.str().c_str());
};
/*!
Return the number of pixels having the gray \e level.
\param level : Gray level in the histogram.
\return Number of pixels having the gray level.
\code
vpImage<unsigned char> I; // A gray level image
vpHistogram h;
h.calculate(I); // Histogram of the gray level image
// Print the histogram values
for (int i=0; i < h.getSize(); i ++)
printf("%d: %d\n", i, h.get(i));
\endcode
*/
inline unsigned get(const unsigned char level) const
{
if(level < size) {
return histogram[level];
}
std::stringstream ss;
ss << "Level is > to size (" << size << ") !";
throw vpException(vpException::dimensionError, ss.str().c_str());
};
/*!
Set the number of pixels having the gray \e level.
\param level : Gray level in the histogram. Level is in [0:255]
\param value : Number of pixels having the gray level.
\code
vpHistogram h;
// Set histogram values
for (int i=0; i < h.getSize(); i ++)
h.set(i, i*2); // for each level i, set a value of 2*i
\endcode
*/
inline void set(const unsigned char level, unsigned int value)
{
if(level < size) {
histogram[level] = value;
} else {
std::stringstream ss;
ss << "Level is > to size (" << size << ") !";
throw vpException(vpException::dimensionError, ss.str().c_str());
}
};
void calculate(const vpImage<unsigned char> &I, const unsigned int nbins=256);
void display(const vpImage<unsigned char> &I, const vpColor &color=vpColor::white, const unsigned int thickness=2,
const unsigned int maxValue_=0);
void smooth(const unsigned int fsize = 3);
unsigned getPeaks(std::list<vpHistogramPeak> & peaks);
unsigned getPeaks(unsigned char dist,
vpHistogramPeak & peak1,
vpHistogramPeak & peak2);
bool getPeaks(unsigned char dist,
vpHistogramPeak & peakl,
vpHistogramPeak & peakr,
vpHistogramValey & valey);
unsigned getValey(std::list<vpHistogramValey> & valey);
bool getValey(const vpHistogramPeak & peak1,
const vpHistogramPeak & peak2,
vpHistogramValey & valey);
unsigned getValey(unsigned char dist,
const vpHistogramPeak & peak,
vpHistogramValey & valeyl,
vpHistogramValey & valeyr);
unsigned sort(std::list<vpHistogramPeak> & peaks);
bool write(const std::string &filename);
bool write(const char *filename);
/*!
Get the histogram size.
\return The size of the histogram, or the image maximum gray
levels numbers.
\sa getValues()
*/
inline unsigned getSize() const
{
return size;
};
/*!
Get the histogram values.
\return A pointer to the array of histogram values. The size of
this array is given by getSize().
\code
vpImage<unsigned char> I; // A gray level image
vpHistogram h;
h.calculate(I); // Histogram of the gray level image
// Print the histogram values
unsigned char *values = h.getValues();
for (int i=0; i < h.getSize(); i ++)
printf("%d: %d\n", i, values[i]);
\endcode
\sa getSize()
*/
inline unsigned * getValues()
{
return histogram;
};
private:
void init(unsigned size = 256);
unsigned int *histogram;
unsigned size; // Histogram size (max allowed 256)
};
#endif
/*
* Local variables:
* c-basic-offset: 2
* End:
*/
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