ByteConvertImage.cxx

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// This is oxl/oxp/ByteConvertImage.cxx
#ifdef VCL_NEEDS_PRAGMA_INTERFACE
#pragma implementation
#endif

#include "ByteConvertImage.h"

#include <vnl/vnl_math.h>
#include <vil1/vil1_clamp.h>
#include <vcl_iostream.h>
#include <vxl_config.h>

ByteConvertImage::ByteConvertImage(vil1_memory_image_of<float> const& in, bool ignore_zero):
  base(in.width(), in.height())
{
  ignore_zero_ = ignore_zero;
  min_ = vnl_huge_val(0.0f);
  max_ = -min_;
  for (int y = 0; y < in.height(); ++y)
    for (int x = 0; x < in.width(); ++x) {
      float v = in(x,y);
      if (ignore_zero && v == 0.0F)
        continue;

      if (v < min_) min_ = v;
      if (v > max_) max_ = v;
    }

  filter(in);
}

ByteConvertImage::ByteConvertImage(vil1_memory_image_of<float> const& in, float min, float max):
  base(in.width(), in.height())
{
  ignore_zero_ = false;
  min_ = min;
  max_ = max;

  filter(in);
}

ByteConvertImage::ByteConvertImage(vil1_memory_image_of<double> const& in, bool ignore_zero):
  base(in.width(), in.height())
{
  ignore_zero_ = ignore_zero;
  min_ = (float)HUGE_VAL;
  max_ = -min_;
  for (int y = 0; y < in.height(); ++y)
    for (int x = 0; x < in.width(); ++x) {
      double v = in(x,y);
      if (ignore_zero && v == 0.0F)
        continue;

      if ((float)v < min_) min_ = (float)v;
      if ((float)v > max_) max_ = (float)v;
    }

  filter(in);
}

ByteConvertImage::ByteConvertImage(vil1_memory_image_of<double> const& in, float min, float max):
  base(in.width(), in.height())
{
  ignore_zero_ = false;
  min_ = min;
  max_ = max;

  filter(in);
}

void ByteConvertImage::filter(vil1_memory_image_of<float> const& in)
{
  float scale = 255 / (max_ - min_);
  for (int y = 0; y < in.height(); ++y)
    for (int x = 0; x < in.width(); ++x) {
      float v = in(x,y);
      if (ignore_zero_ && v == 0.0F)
        (*this)(x,y) = 0;
      else
        (*this)(x,y) = (vxl_byte)vil1_clamp_pixel((v - min_) * scale, 0, 255);
    }
}

void ByteConvertImage::filter(vil1_memory_image_of<double> const& in)
{
  double dmin = (double)min_;
  double scale = 255 / (max_ - min_);
  for (int y = 0; y < in.height(); ++y)
    for (int x = 0; x < in.width(); ++x) {
      double v = in(x,y);
      if (ignore_zero_ && v == 0.0F)
        (*this)(x,y) = 0;
      else
        (*this)(x,y) = (vxl_byte)vil1_clamp_pixel((v - dmin) * scale, 0, 255);
    }
}

void ByteConvertImage::print(vcl_ostream& s) const
{
  s << "ByteConvertImage: range " << min_ << ".." << max_ << '\n';
}

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