source: trunk/saliency_detection/src/cvgabor.cpp @ 18

/***************************************************************************
 *   Copyright (C) 2006 by Mian Zhou   *
 *   M.Zhou@reading.ac.uk   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include <saliency_detection/cvgabor.h>

#undef DEBUG
//#define DEBUG
CvGabor::CvGabor()
{
}


CvGabor::~CvGabor()
{
cvReleaseMat( &Real );
cvReleaseMat( &Imag );
}


/*!
    \fn CvGabor::CvGabor(int iMu, int iNu)
Construct a gabor

Parameters:
        iMu             The orientation iMu*PI/8,
        iNu             The scale,

Returns:
        None,

Create a gabor with a orientation iMu*PI/8, and with a scale iNu. The sigma (Sigma) and the spatial frequence (F) are set to 2*PI and sqrt(2) defaultly. It calls Init() to generate parameters and kernels.
 */
 CvGabor::CvGabor(int iMu, int iNu)
{
    //Initilise the parameters 
    
    Sigma = 2*PI;
    F = sqrt(2.0);
    Init(iMu, iNu, Sigma, F);
    
}

/*!
    \fn CvGabor::CvGabor(int iMu, int iNu, double dSigma)
Construct a gabor

Parameters:
        iMu             The orientation iMu*PI/8,
        iNu             The scale,
        dSigma          The sigma value of Gabor,

Returns:
        None

Create a gabor with a orientation iMu*PI/8, a scale iNu, and a sigma value dSigma. The spatial frequence (F) is set to sqrt(2) defaultly. It calls Init() to generate parameters and kernels.
 */
CvGabor::CvGabor(int iMu, int iNu, float dSigma)
{ 
    F = sqrt(2.0);
    Init(iMu, iNu, dSigma, F);
}


/*!
    \fn CvGabor::CvGabor(int iMu, int iNu, double dSigma, double dF)
Construct a gabor

Parameters:
        iMu             The orientation iMu*PI/8
        iNu             The scale
        dSigma          The sigma value of Gabor
        dF              The spatial frequency 

Returns:
        None

Create a gabor with a orientation iMu*PI/8, a scale iNu, a sigma value dSigma, and a spatial frequence dF. It calls Init() to generate parameters and kernels.
 */
 CvGabor::CvGabor(int iMu, int iNu, float dSigma, float dF)
{

    Init(iMu, iNu, dSigma, dF);
    
}


/*!
    \fn CvGabor::CvGabor(double dPhi, int iNu)
Construct a gabor

Parameters:
        dPhi            The orientation in arc
        iNu             The scale

Returns:
        None

Create a gabor with a orientation dPhi, and with a scale iNu. The sigma (Sigma) and the spatial frequence (F) are set to 2*PI and sqrt(2) defaultly. It calls Init() to generate parameters and kernels.
 */
 CvGabor::CvGabor(float dPhi, int iNu)
{

    Sigma = 2*PI;
    F = sqrt(2.0);
    Init(dPhi, iNu, Sigma, F);
}


/*!
    \fn CvGabor::CvGabor(double dPhi, int iNu, double dSigma)
Construct a gabor

Parameters:
        dPhi            The orientation in arc
        iNu             The scale
        dSigma          The sigma value of Gabor

Returns:
        None
    
Create a gabor with a orientation dPhi, a scale iNu, and a sigma value dSigma. The spatial frequence (F) is set to sqrt(2) defaultly. It calls Init() to generate parameters and kernels.
 */
 CvGabor::CvGabor(float dPhi, int iNu, float dSigma)
{

    F = sqrt(2.0);
    Init(dPhi, iNu, dSigma, F);
}


/*!
    \fn CvGabor::CvGabor(double dPhi, int iNu, double dSigma, double dF)
Construct a gabor

Parameters:
        dPhi            The orientation in arc
        iNu             The scale
        dSigma          The sigma value of Gabor
        dF              The spatial frequency 

Returns:
        None

Create a gabor with a orientation dPhi, a scale iNu, a sigma value dSigma, and a spatial frequence dF. It calls Init() to generate parameters and kernels.
 */
 CvGabor::CvGabor(float dPhi, int iNu, float dSigma, float dF)
{

   Init(dPhi, iNu, dSigma,dF);
}

/*!
    \fn CvGabor::IsInit()
Determine the gabor is initilised or not

Parameters:
        None

Returns:
        a boolean value, TRUE is initilised or FALSE is non-initilised.

Determine whether the gabor has been initlized - variables F, K, Kmax, Phi, Sigma are filled.
 */
bool CvGabor::IsInit()
{

    return bInitialised;
}

/*!
    \fn CvGabor::mask_width()
Give out the width of the mask

Parameters:
        None

Returns:
        The long type show the width.

Return the width of mask (should be NxN) by the value of Sigma and iNu.
 */
long CvGabor::mask_width()
{

    long lWidth;
    if (IsInit() == FALSE)  {
       perror ("Error: The Object has not been initilised in mask_width()!\n");
       return 0;
    }
    else {
       //determine the width of Mask
      float dModSigma = Sigma/K;
      float dWidth = cvRound(dModSigma*6 + 1);
      //test whether dWidth is an odd.
      if (fmod(dWidth, (float)2.0)==0.0) dWidth++;
      lWidth = (long)dWidth;

      return lWidth;
    }
}


/*!
    \fn CvGabor::creat_kernel()
Create gabor kernel

Parameters:
        None

Returns:
        None

Create 2 gabor kernels - REAL and IMAG, with an orientation and a scale 
 */
void CvGabor::creat_kernel()
{
    
    if (IsInit() == FALSE) {perror("Error: The Object has not been initilised in creat_kernel()!\n");}
    else {
      CvMat *mReal, *mImag;
      mReal = cvCreateMat( Width, Width, CV_32FC1);
      mImag = cvCreateMat( Width, Width, CV_32FC1);
      
      /**************************** Gabor Function ****************************/ 
      int x, y;
      float dReal;
      float dImag;
      float dTemp1, dTemp2, dTemp3;

      for (int i = 0; i < Width; i++)
      {
          for (int j = 0; j < Width; j++)
          {
              x = i-(Width-1)/2;
              y = j-(Width-1)/2;
              dTemp1 = (pow(K,2)/pow(Sigma,2))*exp(-(pow((float)x,2)+pow((float)y,2))*pow(K,2)/(2*pow(Sigma,2)));
              dTemp2 = cos(K*cos(Phi)*x + K*sin(Phi)*y) - exp(-(pow(Sigma,2)/2));
              dTemp3 = sin(K*cos(Phi)*x + K*sin(Phi)*y);
              dReal = dTemp1*dTemp2;
              dImag = dTemp1*dTemp3; 
              //gan_mat_set_el(pmReal, i, j, dReal);
              cvmSet( (CvMat*)mReal, i, j, dReal );
              //gan_mat_set_el(pmImag, i, j, dImag);
              cvmSet( (CvMat*)mImag, i, j, dImag );

          } 
       }
       /**************************** Gabor Function ****************************/
       bKernel = TRUE;
       cvCopy(mReal, Real, NULL);
       cvCopy(mImag, Imag, NULL);
       #ifdef DEBUG
       printf("A %d x %d Gabor kernel with %f PI in arc is created.\n", Width, Width, Phi/PI);
       #endif
       cvReleaseMat( &mReal );
       cvReleaseMat( &mImag );
     }
}


/*!
    \fn CvGabor::get_image(int Type)
Get the speific type of image of Gabor

Parameters:
        Type            The Type of gabor kernel, e.g. REAL, IMAG, MAG, PHASE   

Returns:
        Pointer to image structure, or NULL on failure  

Return an Image (gandalf image class) with a specific Type   "REAL"     "IMAG" "MAG" "PHASE"  
 */
IplImage* CvGabor::get_image(int Type)
{

    if(IsKernelCreate() == FALSE)
    { 
      perror("Error: the Gabor kernel has not been created in get_image()!\n");
      return NULL;
    }
    else
    {  
    IplImage* pImage;
    IplImage *newimage;
    newimage = cvCreateImage(cvSize(Width,Width), IPL_DEPTH_8U, 1 );
    //printf("Width is %d.\n",(int)Width);
    //printf("Sigma is %f.\n", Sigma);
    //printf("F is %f.\n", F);
    //printf("Phi is %f.\n", Phi);
    
    //pImage = gan_image_alloc_gl_d(Width, Width);
    pImage = cvCreateImage( cvSize(Width,Width), IPL_DEPTH_32F, 1 );
    
    
    CvMat* kernel = cvCreateMat(Width, Width, CV_32FC1);
    double ve;
    CvScalar S;
    switch(Type)
    {
        case 1:  //Real

           cvCopy( (CvMat*)Real, (CvMat*)kernel, NULL );
            //pImage = cvGetImage( (CvMat*)kernel, pImageGL );
           for (int i = 0; i < kernel->rows; i++)
           {
              for (int j = 0; j < kernel->cols; j++)
              {
                   ve = cvGetReal2D((CvMat*)kernel, i, j);
                   cvSetReal2D( (IplImage*)pImage, j, i, ve );
              }
           }
           break;
        case 2:  //Imag
           cvCopy( (CvMat*)Imag, (CvMat*)kernel, NULL );
           //pImage = cvGetImage( (CvMat*)kernel, pImageGL );
           for (int i = 0; i < kernel->rows; i++)
           {
              for (int j = 0; j < kernel->cols; j++)
              {
                   ve = cvGetReal2D((CvMat*)kernel, i, j);
                   cvSetReal2D( (IplImage*)pImage, j, i, ve );
              }
           }
           break; 
        case 3:  //Magnitude
           ///@todo  
           break;
        case 4:  //Phase
          ///@todo
           break;
    }
   
    cvNormalize((IplImage*)pImage, (IplImage*)pImage, 0, 255, CV_MINMAX, NULL );


    cvConvertScaleAbs( (IplImage*)pImage, (IplImage*)newimage, 1, 0 );

    cvReleaseMat(&kernel);

    cvReleaseImage(&pImage);

    return newimage;
    }
}


/*!
    \fn CvGabor::IsKernelCreate()
Determine the gabor kernel is created or not

Parameters:
        None

Returns:
        a boolean value, TRUE is created or FALSE is non-created.

Determine whether a gabor kernel is created.
 */
bool CvGabor::IsKernelCreate()
{

    return bKernel;
}


/*!
    \fn CvGabor::get_mask_width()
Reads the width of Mask

Parameters:
    None

Returns:
    Pointer to long type width of mask.
 */
long CvGabor::get_mask_width()
{
  return Width;
}


/*!
    \fn CvGabor::Init(int iMu, int iNu, double dSigma, double dF)
Initilize the.gabor

Parameters:
        iMu     The orientations which is iMu*PI.8
        iNu     The scale can be from -5 to infinit
        dSigma  The Sigma value of gabor, Normally set to 2*PI
        dF      The spatial frequence , normally is sqrt(2)

Returns:

Initilize the.gabor with the orientation iMu, the scale iNu, the sigma dSigma, the frequency dF, it will call the function creat_kernel(); So a gabor is created.
 */
void CvGabor::Init(int iMu, int iNu, double dSigma, double dF)
{
  //Initilise the parameters 
    bInitialised = FALSE;
    bKernel = FALSE;

    Sigma = dSigma;
    F = dF;
    
    Kmax = PI/2;
    
    // Absolute value of K
    K = Kmax / pow(F, (float)iNu);
    Phi = PI*iMu/8;
    bInitialised = TRUE;
    Width = mask_width();
    Real = cvCreateMat( Width, Width, CV_32FC1);
    Imag = cvCreateMat( Width, Width, CV_32FC1);
    creat_kernel();
}


/*!
    \fn CvGabor::Init(double dPhi, int iNu, double dSigma, double dF)
Initilize the.gabor

Parameters:
        dPhi    The orientations 
        iNu     The scale can be from -5 to infinit
        dSigma  The Sigma value of gabor, Normally set to 2*PI
        dF      The spatial frequence , normally is sqrt(2)

Returns:
        None

Initilize the.gabor with the orientation dPhi, the scale iNu, the sigma dSigma, the frequency dF, it will call the function creat_kernel(); So a gabor is created.filename      The name of the image file
        file_format     The format of the file, e.g. GAN_PNG_FORMAT
        image   The image structure to be written to the file
        octrlstr        Format-dependent control structure

 */
void CvGabor::Init(double dPhi, int iNu, double dSigma, double dF)
{

    bInitialised = FALSE;
    bKernel = FALSE;
    Sigma = dSigma;
    F = dF;
    
    Kmax = PI/2;
    
    // Absolute value of K
    K = Kmax / pow(F, (float)iNu);
    Phi = dPhi;
    bInitialised = TRUE;
    Width = mask_width();
    Real = cvCreateMat( Width, Width, CV_32FC1);
    Imag = cvCreateMat( Width, Width, CV_32FC1);
    creat_kernel();
}



/*!
    \fn CvGabor::get_matrix(int Type)
Get a matrix by the type of kernel

Parameters:
        Type            The type of kernel, e.g. REAL, IMAG, MAG, PHASE

Returns:
        Pointer to matrix structure, or NULL on failure.

Return the gabor kernel.
 */
CvMat* CvGabor::get_matrix(int Type)
{
    if (!IsKernelCreate()) {perror("Error: the gabor kernel has not been created!\n"); return NULL;}
    switch (Type)
    {
      case CV_GABOR_REAL:
        return Real;
        break;
      case CV_GABOR_IMAG:
        return Imag;
        break;
      case CV_GABOR_MAG:
        return NULL;
        break;
      case CV_GABOR_PHASE:
        return NULL;
        break;
    }
}




/*!
    \fn CvGabor::output_file(const char *filename, Gan_ImageFileFormat file_format, int Type)
Writes a gabor kernel as an image file.

Parameters:
        filename        The name of the image file
        file_format     The format of the file, e.g. GAN_PNG_FORMAT
        Type            The Type of gabor kernel, e.g. REAL, IMAG, MAG, PHASE   
Returns:
        None

Writes an image from the provided image structure into the given file and the type of gabor kernel.
 */
void CvGabor::output_file(const char *filename, int Type)
{
  IplImage *pImage;
  pImage = get_image(Type);
  if(pImage != NULL)
  {
    if( cvSaveImage(filename, pImage )) printf("%s has been written successfully!\n", filename);
    else printf("Error: writting %s has failed!\n", filename);
  }
  else 
    perror("Error: the image is empty in output_file()!\n"); 

  cvReleaseImage(&pImage);
}






/*!
    \fn CvGabor::show(int Type)
 */
void CvGabor::show(int Type)
{
    if(!IsInit()) {
        perror("Error: the gabor kernel has not been created!\n");
    }
    else {
    IplImage *pImage;
    pImage = get_image(Type);
    cvNamedWindow("Testing",1);
    cvShowImage("Testing",pImage);
    cvWaitKey(0);
    cvDestroyWindow("Testing");
    cvReleaseImage(&pImage);
    }

}




/*!
    \fn CvGabor::conv_img(IplImage *src, IplImage *dst, int Type)
 */
void CvGabor::conv_img(IplImage *src, IplImage *dst, int Type)
{
    double ve, re,im;

    CvMat *mat = cvCreateMat(src->width, src->height, CV_32FC1);
    for (int i = 0; i < src->width; i++)
    {
       for (int j = 0; j < src->height; j++)
       {
              ve = cvGetReal2D((IplImage*)src, j, i);
              cvSetReal2D( (CvMat*)mat, i, j, ve );
       }
    }

    CvMat *rmat = cvCreateMat(src->width, src->height, CV_32FC1);
    CvMat *imat = cvCreateMat(src->width, src->height, CV_32FC1);

    CvMat *kernel = cvCreateMat( Width, Width, CV_32FC1 );

    switch (Type)
    {
      case CV_GABOR_REAL:
        cvCopy( (CvMat*)Real, (CvMat*)kernel, NULL );
        cvFilter2D( (CvMat*)mat, (CvMat*)mat, (CvMat*)kernel, cvPoint( (Width-1)/2, (Width-1)/2));
        break;
      case CV_GABOR_IMAG:
        cvCopy( (CvMat*)Imag, (CvMat*)kernel, NULL );
        cvFilter2D( (CvMat*)mat, (CvMat*)mat, (CvMat*)kernel, cvPoint( (Width-1)/2, (Width-1)/2));
        break;
      case CV_GABOR_MAG:
        /* Real Response */
        cvCopy( (CvMat*)Real, (CvMat*)kernel, NULL );
        cvFilter2D( (CvMat*)mat, (CvMat*)rmat, (CvMat*)kernel, cvPoint( (Width-1)/2, (Width-1)/2));
        /* Imag Response */
        cvCopy( (CvMat*)Imag, (CvMat*)kernel, NULL );
        cvFilter2D( (CvMat*)mat, (CvMat*)imat, (CvMat*)kernel, cvPoint( (Width-1)/2, (Width-1)/2));
        /* Magnitude response is the square root of the sum of the square of real response and imaginary response */
        for (int i = 0; i < mat->rows; i++)
        {
           for (int j = 0; j < mat->cols; j++)
           {
               re = cvGetReal2D((CvMat*)rmat, i, j);
               im = cvGetReal2D((CvMat*)imat, i, j);
               ve = sqrt(re*re + im*im);
               cvSetReal2D( (CvMat*)mat, i, j, ve );
           }
        }       
        break;
      case CV_GABOR_PHASE:
        break;
    }
    
    if (dst->depth == IPL_DEPTH_8U)
    {
        cvNormalize((CvMat*)mat, (CvMat*)mat, 0, 255, CV_MINMAX);
        for (int i = 0; i < mat->rows; i++)
        {
            for (int j = 0; j < mat->cols; j++)
            {
                ve = cvGetReal2D((CvMat*)mat, i, j);
                ve = cvRound(ve);
                cvSetReal2D( (IplImage*)dst, j, i, ve );
            }
        }
     }

     if (dst->depth == IPL_DEPTH_32F)
     {
         for (int i = 0; i < mat->rows; i++)
         {
            for (int j = 0; j < mat->cols; j++)
            {
                ve = cvGetReal2D((CvMat*)mat, i, j);
                cvSetReal2D( (IplImage*)dst, j, i, ve );
            }
         }
     }       

    cvReleaseMat(&kernel);
    cvReleaseMat(&imat);   
    cvReleaseMat(&rmat);
    cvReleaseMat(&mat);
}