source: trunk/src/Cubes/cubes.hh @ 500

// -----------------------------------------------------------------------
// cubes.hh: Definitions of the DataArray, Cube and Image classes.
// -----------------------------------------------------------------------
// Copyright (C) 2006, Matthew Whiting, ATNF
//
// 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.
//
// Duchamp 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 Duchamp; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
//
// Correspondence concerning Duchamp may be directed to:
//    Internet email: Matthew.Whiting [at] atnf.csiro.au
//    Postal address: Dr. Matthew Whiting
//                    Australia Telescope National Facility, CSIRO
//                    PO Box 76
//                    Epping NSW 1710
//                    AUSTRALIA
// -----------------------------------------------------------------------
#ifndef CUBES_H
#define CUBES_H

#include <iostream>
#include <string>
#include <vector>

#include <duchamp/duchamp.hh>
#include <duchamp/param.hh>
#include <duchamp/fitsHeader.hh>
#include <duchamp/Detection/detection.hh>
#include <duchamp/Detection/columns.hh>
#include <duchamp/Cubes/plots.hh>
#include <duchamp/Utils/Statistics.hh>
#include <duchamp/PixelMap/Scan.hh>
#include <duchamp/PixelMap/Object2D.hh>


namespace duchamp
{


  /** Search a reconstructed array for significant detections. */
  std::vector <Detection> 
  searchReconArray(long *dim, float *originalArray, float *reconArray, 
                   Param &par, Statistics::StatsContainer<float> &stats);
  std::vector <Detection> 
  searchReconArraySimple(long *dim, float *originalArray, float *reconArray, 
                         Param &par, Statistics::StatsContainer<float> &stats);

  /** Search a 3-dimensional array for significant detections. */
  std::vector <Detection> 
  search3DArray(long *dim, float *Array, Param &par,
                Statistics::StatsContainer<float> &stats);
  std::vector <Detection> 
  search3DArraySimple(long *dim, float *Array, Param &par,
                      Statistics::StatsContainer<float> &stats);

  /** 
   * Base class for the image container.
   *
   * Definition of an n-dimensional data array:
   *     array of pixel values, size & dimensions
   *     array of Detection objects
   */

  class DataArray
  {
  public:
    DataArray();  ///< Basic DataArray constructor
    DataArray(short int nDim); ///< Basic nDim-dimensional DataArray constructor
    DataArray(short int nDim, long size);///< Basic nDim-dimensional DataArray constructor, specifying size.
    DataArray(short int nDim, long *dimensions); ///< Basic nDim-dimensional DataArray constructor, specifying size of dimensions.
    virtual ~DataArray(); ///< Basic DataArray constructor

    //-----------------------------------------
    // Obvious inline accessor functions.
    //
    long               getDimX(){if(numDim>0) return axisDim[0];else return 0;}; 
    long               getDimY(){if(numDim>1) return axisDim[1];else return 1;};
    long               getDimZ(){if(numDim>2) return axisDim[2];else return 1;};
    long               getSize(){ return numPixels; };
    short int          getNumDim(){ return numDim; };
    virtual float      getPixValue(long pos){ return array[pos]; };
    virtual void       setPixValue(long pos, float f){array[pos] = f;};
    Detection          getObject(long number){ return objectList->at(number); };
    Detection *        pObject(long number){ return &(objectList->at(number));};
    std::vector <Detection> getObjectList(){ return *objectList; };
    std::vector <Detection> *pObjectList(){ return objectList; };
    std::vector <Detection> &ObjectList(){ std::vector<Detection> &rlist = *objectList; return rlist; };
    long               getNumObj(){ return objectList->size(); };

    /** Delete all objects from the list of detections. */
    void               clearDetectionList(){ 
      //objectList->clear(); 
      delete objectList;
      objectList = new std::vector<Detection>;
    };

    /** Read a parameter set from file. */
    int                readParam(std::string paramfile){
      /** 
       *  Uses Param::readParams() to read parameters from a file.
       *  \param paramfile The file to be read.
       */
      return par.readParams(paramfile); 
    };

    //-----------------------------------------
    // Related to the various arrays
    // 
    /**  Return first three dimensional axes. */
    void               getDim(long &x, long &y, long &z);
    /** Return array of dimensional sizes.*/
    void               getDimArray(long *output);
    long *             getDimArray(){return axisDim;};

    /** Return pixel value array. */
    void               getArray(float *output);
    float *            getArray(){return array;};

    /** Save pixel value array. */
    virtual void       saveArray(float *input, long size);

    //-----------------------------------------
    // Related to the object lists
    //
    /** Adds a single detection to the object list.*/
    void               addObject(Detection object);

    /** Adds all objects in a detection list to the object list. */
    void               addObjectList(std::vector <Detection> newlist);   

    /** Add pixel offsets to object coordinates. */
    void               addObjectOffsets(); 

    //-----------------------------------------
    // Parameter list related.
    //
    /** Output the Param set.*/
    void               showParam(std::ostream &stream){ stream << par; }; 
    /** Return the Param set.*/
    Param              getParam(){ return par; }; 
    /** Save a Param set to the Cube.*/
    void               saveParam(Param &newpar){par = newpar;};
    /** Provides a reference to the Param set.*/
    Param&             pars(){ Param &rpar = par; return rpar; }; 
    /** Is the voxel number given by vox a BLANK value?*/
    bool               isBlank(int vox); 

    // --------------------------------------------
    // Statistics
    //
    /**  Returns the StatsContainer. */
    Statistics::StatsContainer<float> getStats(){ return Stats; };

    /** Provides a reference to the StatsContainer. */
    Statistics::StatsContainer<float>& stats(){ 
      Statistics::StatsContainer<float> &rstats = Stats;  return rstats;
    };
 
    /** Save a StatsContainer to the Cube. */
    void saveStats(Statistics::StatsContainer<float> newStats){ Stats = newStats;};

    /** A detection test for value. */
    bool isDetection(float value);

    /**  A detection test for pixel.  */
    bool isDetection(long voxel);


    /** Output operator for DataArray.*/
    friend std::ostream& operator<< (std::ostream& theStream, DataArray &array);
 

  protected:
    short int                numDim;     ///< Number of dimensions.
    long                    *axisDim;    ///< Array of axis dimensions of cube
    bool                     axisDimAllocated; ///< has axisDim been allocated?
    long                     numPixels;  ///< Total number of pixels in cube.
    float                   *array;      ///< Array of data.
    bool                     arrayAllocated; ///< has the array been allocated?
    std::vector <Detection> *objectList; ///< The list of detected objects.
    Param                    par;        ///< A parameter list.
    Statistics::StatsContainer<float> Stats; ///< The statistics for the DataArray.
  };



  //=========================================================================

  /**
   * Definition of an data-cube object (3D):
   *     a DataArray object limited to dim=3
   */

  class Cube : public DataArray
  {
  public:
    Cube();                 ///< Basic Cube constructor.
    Cube(long nPix);        ///< Alternative Cube constructor.
    Cube(long *dimensions); ///< Alternative Cube constructor.
    virtual ~Cube();        ///< Basic Cube destructor.

    // INLINE functions -- definitions included after class declaration.
    /** Is the voxel number given by vox a BLANK value? */
    bool        isBlank(int vox){ return par.isBlank(array[vox]); };

    /** Is the voxel at (x,y,z) a BLANK value? */
    bool        isBlank(long x, long y, long z){ 
      return par.isBlank(array[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x]); };

    /** Return a bool array masking blank pixels: 1=good, 0=blank */
    bool *      makeBlankMask(){return par.makeBlankMask(array, numPixels);};

    /** Does the Cube::recon array exist? */
    bool        isRecon(){ return reconExists; }; 

    float       getPixValue(long pos){ return array[pos]; };
    float       getPixValue(long x, long y, long z){ 
      return array[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x]; };
    short       getDetectMapValue(long pos){ return detectMap[pos]; };
    short       getDetectMapValue(long x, long y){ return detectMap[y*axisDim[0]+x]; };
    float       getReconValue(long pos){ return recon[pos]; };
    float       getReconValue(long x, long y, long z){ 
      return recon[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x];};
    float       getBaselineValue(long pos){ return baseline[pos]; };
    float       getBaselineValue(long x, long y, long z){ 
      return baseline[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x]; };
    void        setPixValue(long pos, float f){array[pos] = f;};
    void        setPixValue(long x, long y, long z, float f){ 
      array[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x] = f;};
    void        setDetectMapValue(long pos, short f){ detectMap[pos] = f;};
    void        setDetectMapValue(long x, long y, short f){ detectMap[y*axisDim[0] + x] = f;};
    void        setReconValue(long pos, float f){recon[pos] = f;};
    void        setReconValue(long x, long y, long z, float f){ 
      recon[z*axisDim[0]*axisDim[1] + y*axisDim[0] + x] = f; };
    void        setReconFlag(bool f){reconExists = f;};

    std::vector<Column::Col> getLogCols(){return logCols;};
    void        setLogCols(std::vector<Column::Col> C){logCols=C;};
    std::vector<Column::Col> getFullCols(){return fullCols;};
    void        setFullCols(std::vector<Column::Col> C){fullCols=C;};

    // additional functions -- in Cubes/cubes.cc
    /** Allocate memory correctly, with WCS defining the correct axes. */
    void        initialiseCube(long *dimensions, bool allocateArrays=true);

    /** Read in a FITS file, with subsection correction. */
    int         getCube();
    /** Read in a FITS file, with subsection correction. */
    int         getMetadata();

    /** Read in command-line options. */
    //   int         getopts(int argc, char ** argv);
    int         getopts(int argc, char ** argv, std::string progname="Duchamp"){return par.getopts(argc,argv,progname);};

    /** Read in reconstructed & smoothed arrays from FITS files on disk. */
    void        readSavedArrays();

    /** Save an external array to the Cube's pixel array */
    void        saveArray(float *input, long size);

    /** Save an external array to the Cube's pixel array */
    void        saveArray(std::vector<float> &input);

    /** Save an external array to the Cube's reconstructed array. */
    void        saveRecon(float *input, long size);

    /** Save reconstructed array to an external array. */
    void        getRecon(float *output);
    float *     getRecon(){return recon; };

    /** Set Milky Way channels to zero. */
    void        removeMW();

    //------------------------
    // Statistics for cube
    //

    /** Calculate the statistics for the Cube (older version). */
    void        setCubeStatsOld();

    /** Calculate the statistics for the Cube. */
    void        setCubeStats();

    /** Set up thresholds for the False Discovery Rate routine. */
    void        setupFDR();
    /** Set up thresholds for the False Discovery Rate routine using a
        particular array. */
    void        setupFDR(float *input);

    /** A detection test for a given voxel. */
    bool        isDetection(long x, long y, long z);

    //-----------------------------
    // Dealing with the detections 
    //

    /** Calculate the object fluxes */
    void        calcObjectFluxes();

    /** Calculate the WCS parameters for each Cube Detection. */
    void        calcObjectWCSparams();
    /** Calculate the WCS parameters for each Cube Detection, using flux information in Voxels. */
    void        calcObjectWCSparams(std::vector< std::vector<PixelInfo::Voxel> > bigVoxList);

    /** Sort the list of detections. */
    void        sortDetections();

    /** Update the map of detected pixels. */
    void        updateDetectMap();

    /** Update the map of detected pixels for a given Detection. */
    void        updateDetectMap(Detection obj);

    /** Clear the map of detected pixels. */
    void        clearDetectMap(){
      for(int i=0;i<axisDim[0]*axisDim[1];i++) detectMap[i]=0;
    };

    /** Find the flux enclosed by a Detection. */
    float       enclosedFlux(Detection obj);

    /** Set up the output column definitions for the Cube and its
        Detection list. */
    void        setupColumns();

    /** Is the object at the edge of the image? */
    bool        objAtSpatialEdge(Detection obj);

    /** Is the object at an end of the spectrum? */
    bool        objAtSpectralEdge(Detection obj);

    /** Set warning flags for the detections. */
    void        setObjectFlags();

    // ----------------------------
    // Dealing with the WCS
    //
    /** Return the FitsHeader object. */
    FitsHeader  getHead(){ return head; }; 
    /** Define the FitsHeader object. */
    void        setHead(FitsHeader F){head = F;};
    /** Provide a reference to the FitsHeader object.*/
    FitsHeader& header(){ FitsHeader &h = head; return h; };

    /** Convert a point from WCS to Pixel coords. */
    int         wcsToPix(const double *world, double *pix);

    /** Convert a set of points from WCS to Pixel coords. */
    int         wcsToPix(const double *world, double *pix, const int npts);

    /** Convert a point from Pixel to WCS coords. */
    int         pixToWCS(const double *pix, double *world);

    /** Convert a set of points from Pixel to WCS coords. */
    int         pixToWCS(const double *pix, double *world, const int npts);

    //-------------------------------------------
    // FITS-I/O related functions -- not in cubes.cc
    //
    /** Function to read in FITS file.*/
    int         getMetadata(std::string fname);  // in Cubes/getImage.cc
    int         getCube(std::string fname);  // in Cubes/getImage.cc

    /** Convert the flux units to something user-specified.*/
    void        convertFluxUnits(); // in Cubes/getImage.cc

    /** Function to retrieve FITS data array */
    int         getFITSdata(std::string fname);   // in FitsIO/dataIO.cc

    /** Save a mask array to disk.*/
    void        saveMaskCube();       // in Cubes/saveImage.cc

    /** Save Smoothed array to disk.*/
    void        saveSmoothedCube();       // in Cubes/saveImage.cc

    /** Save Reconstructed array to disk. */
    void        saveReconstructedCube();  // in Cubes/saveImage.cc

    /** Read in reconstructed array from FITS file. */
    int         readReconCube();  // in Cubes/readRecon.cc
  
    /** Read in Hanning-smoothed array from FITS file. */
    int         readSmoothCube();     // in Cubes/readSmooth.cc  

    //-------------------------------------
    // Functions that act on the cube
    //

    /** Remove excess BLANK pixels from spatial edge of cube. */
    void        trimCube();         // in Cubes/trimImage.cc

    /** Replace BLANK pixels to spatial edge of cube. */
    void        unTrimCube();       // in Cubes/trimImage.cc

    /** Removes the baselines from the spectra, and stores in Cube::baseline */
    void        removeBaseline();   // in Cubes/baseline.cc

    /** Replace the baselines stored in Cube::baseline */
    void        replaceBaseline();  // in Cubes/baseline.cc

    /** Multiply all pixel values by -1. */
    void        invert();           // in Cubes/invertCube.cc

    /** Undo the inversion, and invert fluxes of all detected objects. */
    void        reInvert();         // in Cubes/invertCube.cc

    //-------------------------------------
    // Reconstruction, Searching and Merging functions
    //
    // in ATrous/ReconSearch.cc
    /** Front-end to reconstruction & searching functions.*/
    void        ReconSearch();
    /** Switcher to reconstruction functions */
    void        ReconCube();
    /** Performs 1-dimensional a trous reconstruction on the Cube. */
    void        ReconCube1D();
    /** Performs 2-dimensional a trous reconstruction on the Cube. */
    void        ReconCube2D();
    /** Performs 3-dimensional a trous reconstruction on the Cube. */
    void        ReconCube3D();

    // in Cubes/CubicSearch.cc
    /** Front-end to the cubic searching routine. */
    void        CubicSearch();

    // in Cubes/smoothCube.cc 
    /** Smooth the cube with the requested method.*/
    void        SmoothCube();
    /** Front-end to the smoothing and searching functions. */
    void        SmoothSearch();
    /** A function to spatially smooth the cube and search the result. */
    void        SpatialSmoothNSearch();
    /** A function to Hanning-smooth the cube. */
    void        SpectralSmooth();
    /** A function to spatially-smooth the cube. */
    void        SpatialSmooth();

    void        Simple3DSearch(){
      /** 
       * Basic front-end to the simple 3d searching function -- does
       * nothing more. 
       *
       * This function just runs the search3DArraySimple function,
       * storing the results in the Cube::objectList vector. No stats
       * are calculated beforehand, and no logging or detection map
       * updating is done.
       */
      *objectList = search3DArraySimple(axisDim,array,par,Stats);
    };

    void        Simple3DSearchRecon(){
      /** 
       * Basic front-end to the 3d searching function used in the
       * reconstruction case -- does nothing more.
       *
       * This function just runs the searchReconArraySimple function,
       * storing the results in the Cube::objectList vector. No stats
       * are calculated beforehand, and no logging or detection map
       * updating is done. The recon array is assumed to have been
       * defined already.
       */
      *objectList = searchReconArraySimple(axisDim,array,recon,par,Stats);
    };

    void        Simple3DSearchSmooth(){
      /** 
       * Basic front-end to the simple 3d searching function run on the
       * smoothed array -- does nothing more.
       *
       * This function just runs the search3DArraySimple function on the
       * recon array (which contains the smoothed array), storing the
       * results in the Cube::objectList vector. No stats are calculated
       * beforehand, and no logging or detection map updating is
       * done. The recon array is assumed to have been defined already.
       */
      *objectList = search3DArraySimple(axisDim,recon,par,Stats);
    };

    // in Cubes/Merger.cc
    /** Merge all objects in the detection list so that only distinct
        ones are left. */
    void        ObjectMerger();
  
    // in Cubes/existingDetections.cc
    /** Read a previously-created log file to get the detections without searching */
    int getExistingDetections();

    //-------------------------------------
    // Text outputting of detected objects.
    //   in Cubes/detectionIO.cc
    //
    /** Set up the output file with parameters and stats. */
    void        prepareOutputFile();

    /** Write the statistical information to the output file. */
    void        outputStats();

    /** Output detections to the output file and standard output. */
    void        outputDetectionList();

    /** Prepare the log file for output. */
    void        prepareLogFile(int argc, char *argv[]);

    /** Output detections to the log file. */
    void        logDetectionList();

    /** Output a single detection to the log file. */
    void        logDetection(Detection obj, int counter);

    /** Output detections to a Karma annotation file. */
    void        outputDetectionsKarma(std::ostream &stream);

    /** Output detections to a VOTable. */
    void        outputDetectionsVOTable(std::ostream &stream);

    // ----------------------------------
    // Graphical plotting of the cube and the detections.
    //
    //  in Cubes/plotting.cc
    /** Plot a spatial map of detections based on number of detected
        channels. */
    void        plotDetectionMap(std::string pgDestination);

    /** Plot a spatial map of detections based on 0th moment map of each
        object. */
    void        plotMomentMap(std::string pgDestination);

    /** Plot a spatial map of detections based on 0th moment map of each
        object to a number of PGPLOT devices. */
    void        plotMomentMap(std::vector<std::string> pgDestination);

    /** Draw WCS axes over a PGPLOT map. */
    void        plotWCSaxes(int textColour=DUCHAMP_ID_TEXT_COLOUR,
                            int axisColour=DUCHAMP_WCS_AXIS_COLOUR);

    //  in Cubes/outputSpectra.cc
    /** Print spectra of each detected object. */
    void        outputSpectra();

    /** Write out text file of all spectra. */
    void        writeSpectralData();

    /** Print spectrum of a single object */
    void        plotSpectrum(int objNum, Plot::SpectralPlot &plot);
    /** Plot the image cutout for a single object */
    void        plotSource(Detection obj, Plot::CutoutPlot &plot);

    /** Get the spectral arrays */
    void        getSpectralArrays(int objNumber, float *specx, float *specy, float *specRecon, float *specBase);

    //  in Cubes/drawMomentCutout.cc
    /** Draw the 0th moment map for a single object. */
    void        drawMomentCutout(Detection &object);

    /** Draw a scale bar indicating angular size of the cutout. */
    void        drawScale(float xstart,float ystart,float channel);

    /** Draw a yellow line around the edge of the spatial extent of
        pixels. */
    void        drawFieldEdge();

  private: 
    float      *recon;            ///< reconstructed array - used when
    ///   doing a trous reconstruction.
    bool        reconExists;      ///< flag saying whether there is a
    ///   reconstruction
    short      *detectMap;        ///< "moment map" - x,y locations of
    ///   detected pixels
    float      *baseline;         ///< array of spectral baseline
    ///   values.
                             
    bool        reconAllocated;   ///< have we allocated memory for the
    ///   recon array?
    bool        baselineAllocated;///< have we allocated memory for the
    ///   baseline array?
    FitsHeader  head;             ///< the WCS and other header
    ///   information.
    std::vector<Column::Col> fullCols;    ///< the list of all columns as
    ///   printed in the results file
    std::vector<Column::Col> logCols;     ///< the list of columns as printed in
    ///   the log file

  };

  ////////////
  //// Cube inline function definitions
  ////////////

  inline int Cube::wcsToPix(const double *world, double *pix)
  {
    /** 
     *  Use the WCS in the FitsHeader to convert from WCS to pixel coords for
     *   a single point.
     *  \param world The world coordinates.
     *  \param pix The returned pixel coordinates.
     */
    return this->head.wcsToPix(world,pix);
  } 
  inline int Cube::wcsToPix(const double *world, double *pix, const int npts)
  {
    /** 
     *  Use the WCS in the FitsHeader to convert from WCS to pixel coords for
     *   a set of points.
     *  \param world The world coordinates.
     *  \param pix The returned pixel coordinates.
     *  \param npts The number of points being converted.
     */
    return this->head.wcsToPix(world,pix,npts);
  }
  inline int Cube::pixToWCS(const double *pix, double *world)
  {
    /** 
     *  Use the WCS in the FitsHeader to convert from pixel to WCS coords for
     *   a single point.
     *  \param pix The pixel coordinates.
     *  \param world The returned world coordinates.
     */
    return this->head.pixToWCS(pix,world);
  }
  inline int Cube::pixToWCS(const double *pix, double *world, const int npts)
  {
    /** 
     *  Use the WCS in the FitsHeader to convert from pixel to WCS coords for
     *   a set of points.
     *  \param pix The pixel coordinates.
     *  \param world The returned world coordinates.
     *  \param npts The number of points being converted.
     */
    return this->head.pixToWCS(pix,world,npts);
  }


  //============================================================================

  /**
   *  A DataArray object limited to two dimensions, and with some additional
   *   special functions. 
   *
   *  It is used primarily for searching a 1- or 2-D array with 
   *   lutz_detect() and spectrumDetect().
   */

  class Image : public DataArray
  {
  public:
    Image(){numPixels=0; numDim=2;};
    Image(long nPix);
    Image(long *dimensions);
    virtual ~Image(){};

    //--------------------
    // Defining the array
    //
    /** Save an external array to the Cube's pixel array */
    void      saveArray(float *input, long size);

    /** Extract a spectrum from an array and save to the local pixel array. */
    void      extractSpectrum(float *Array, long *dim, long pixel);

    /** Extract an image from an array and save to the local pixel array. */
    void      extractImage(float *Array, long *dim, long channel);

    /** Extract a spectrum from a cube and save to the local pixel array. */
    void      extractSpectrum(Cube &cube, long pixel);

    /** Extract an image from a cube and save to the local pixel array. */
    void      extractImage(Cube &cube, long channel);

    //--------------------
    // Accessing the data.
    //
    float     getPixValue(long pos){ return array[pos]; };
    float     getPixValue(long x, long y){return array[y*axisDim[0] + x];};
    // the next few should have checks against array overflow...
    void      setPixValue(long pos, float f){array[pos] = f;};
    void      setPixValue(long x, long y, float f){array[y*axisDim[0] + x] = f;};
    bool      isBlank(int vox){return par.isBlank(array[vox]);};
    bool      isBlank(long x,long y){return par.isBlank(array[y*axisDim[0]+x]);};

    //-----------------------
    // Detection-related
    //
    // in Detection/lutz_detect.cc:
    /** Detect objects in a 2-D image */
    std::vector<PixelInfo::Object2D> lutz_detect();

    // in Detection/spectrumDetect.cc:
    /** Detect objects in a 1-D spectrum */
    std::vector<PixelInfo::Scan> spectrumDetect();

    int       getMinSize(){return minSize;};
    void      setMinSize(int i){minSize=i;};

    /**  A detection test for a pixel location.  */
    bool      isDetection(long x, long y){
      /**
       * Test whether a pixel (x,y) is a statistically significant detection,
       * according to the set of statistics in the local StatsContainer object.
       */
      long voxel = y*axisDim[0] + x;
      if(isBlank(x,y)) return false;
      else return Stats.isDetection(array[voxel]);
    };  

    /** Blank out a set of channels marked as being Milky Way channels */
    void      removeMW();

  private: 
    int       minSize;    ///< the minimum number of pixels for a
    ///   detection to be accepted.
  };


}

#endif