openni_shift_to_depth_conversion.h

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/*
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 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2011 Willow Garage, Inc.
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#include <pcl/pcl_config.h>
#ifdef HAVE_OPENNI

#ifndef __OPENNI_SHIFT_TO_DEPTH_CONVERSION
#define __OPENNI_SHIFT_TO_DEPTH_CONVERSION

#include <vector>
#include <limits>

namespace openni_wrapper
{
  class PCL_EXPORTS ShiftToDepthConverter
  {
    public:
      ShiftToDepthConverter () : init_(false) {}

      virtual ~ShiftToDepthConverter () {};

      void
      generateLookupTable ()
      {
        // lookup of 11 bit shift values
        const std::size_t table_size = 1<<10;

        lookupTable_.clear();
        lookupTable_.resize(table_size);

        // constants taken from openni driver
        static const int16_t nConstShift = 800;
        static const double nParamCoeff = 4.000000;
        static const double dPlanePixelSize = 0.104200;
        static const double nShiftScale = 10.000000;
        static const double dPlaneDsr = 120.000000;
        static const double dPlaneDcl = 7.500000;

        std::size_t i;
        double dFixedRefX;
        double dMetric;

        for (i=0; i<table_size; ++i)
        {
          // shift to depth calculation from opnni
          dFixedRefX = (static_cast<double>(i - nConstShift) / nParamCoeff)-0.375;
          dMetric = dFixedRefX * dPlanePixelSize;
          lookupTable_[i] = static_cast<float>((nShiftScale * ((dMetric * dPlaneDsr / (dPlaneDcl - dMetric)) + dPlaneDsr) ) / 1000.0f);
        }

        init_ = true;
      }

      inline float
      shiftToDepth (uint16_t shift_val)
      {
        assert (init_);

        static const float bad_point = std::numeric_limits<float>::quiet_NaN ();

        float ret = bad_point;

        // lookup depth value in shift lookup table
        if (shift_val<lookupTable_.size())
          ret = lookupTable_[shift_val];

        return ret;
      }

      inline bool isInitialized() const
      {
        return init_;
      }

    protected:
      std::vector<float> lookupTable_;
      bool init_;
  } ;
}

#endif
#endif //__OPENNI_SHIFT_TO_DEPTH_CONVERSION