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vigra/impexbase.hxx VIGRA

00001 /************************************************************************/
00002 /*                                                                      */
00003 /*               Copyright 2012 Christoph Spiel                         */
00004 /*                                                                      */
00005 /*    This file is part of the VIGRA computer vision library.           */
00006 /*    The VIGRA Website is                                              */
00007 /*        http://hci.iwr.uni-heidelberg.de/vigra/                       */
00008 /*    Please direct questions, bug reports, and contributions to        */
00009 /*        ullrich.koethe@iwr.uni-heidelberg.de    or                    */
00010 /*        vigra@informatik.uni-hamburg.de                               */
00011 /*                                                                      */
00012 /*    Permission is hereby granted, free of charge, to any person       */
00013 /*    obtaining a copy of this software and associated documentation    */
00014 /*    files (the "Software"), to deal in the Software without           */
00015 /*    restriction, including without limitation the rights to use,      */
00016 /*    copy, modify, merge, publish, distribute, sublicense, and/or      */
00017 /*    sell copies of the Software, and to permit persons to whom the    */
00018 /*    Software is furnished to do so, subject to the following          */
00019 /*    conditions:                                                       */
00020 /*                                                                      */
00021 /*    The above copyright notice and this permission notice shall be    */
00022 /*    included in all copies or substantial portions of the             */
00023 /*    Software.                                                         */
00024 /*                                                                      */
00025 /*    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND    */
00026 /*    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES   */
00027 /*    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND          */
00028 /*    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT       */
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00031 /*    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR     */
00032 /*    OTHER DEALINGS IN THE SOFTWARE.                                   */
00033 /*                                                                      */
00034 /************************************************************************/
00035 
00036 #ifndef VIGRA_IMPEXBASE_HXX
00037 #define VIGRA_IMPEXBASE_HXX
00038 
00039 
00040 #include <string>
00041 #include "inspectimage.hxx"
00042 #include "sized_int.hxx"
00043 #include "utilities.hxx"
00044 
00045 
00046 namespace vigra
00047 {
00048     typedef enum
00049     {
00050         UNSIGNED_INT_8,
00051         UNSIGNED_INT_16,
00052         UNSIGNED_INT_32,
00053         SIGNED_INT_16,
00054         SIGNED_INT_32,
00055         IEEE_FLOAT_32,
00056         IEEE_FLOAT_64
00057     } pixel_t;
00058 
00059 
00060     namespace detail
00061     {
00062         inline static pixel_t
00063         pixel_t_of_string(const std::string& pixel_type)
00064         {
00065             if (pixel_type == "UINT8")
00066             {
00067                 return UNSIGNED_INT_8;
00068             }
00069             else if (pixel_type == "UINT16")
00070             {
00071                 return UNSIGNED_INT_16;
00072             }
00073             else if (pixel_type == "UINT32")
00074             {
00075                 return UNSIGNED_INT_32;
00076             }
00077             else if (pixel_type == "INT16")
00078             {
00079                 return SIGNED_INT_16;
00080             }
00081             else if (pixel_type == "INT32")
00082             {
00083                 return SIGNED_INT_32;
00084             }
00085             else if (pixel_type == "FLOAT")
00086             {
00087                 return IEEE_FLOAT_32;
00088             }
00089             else if (pixel_type == "DOUBLE")
00090             {
00091                 return IEEE_FLOAT_64;
00092             }
00093             else
00094             {
00095                 vigra_fail("vigra_ext::detail::pixel_t_of_string: unknown pixel type");
00096                 return UNSIGNED_INT_8; // NOT REACHED
00097             }
00098         }
00099 
00100 
00101         struct identity
00102         {
00103             template <typename T>
00104             T operator()(T x) const
00105             {
00106                 return x;
00107             }
00108         };
00109 
00110 
00111         typedef pair<double, double> range_t;
00112 
00113 
00114         class linear_transform
00115         {
00116         public:
00117             linear_transform(const range_t& source, const range_t& destination) :
00118                 scale_((destination.second - destination.first) / (source.second - source.first)),
00119                 offset_(destination.first / scale_ - source.first)
00120             {}
00121 
00122             template <typename T>
00123             double operator()(T x) const
00124             {
00125                 return scale_ * (static_cast<double>(x) + offset_);
00126             }
00127 
00128         private:
00129             const double scale_;
00130             const double offset_;
00131         };
00132 
00133 
00134         template <class Iterator, class Accessor>
00135         inline static range_t
00136         find_value_range(Iterator upper_left, Iterator lower_right, Accessor accessor,
00137                          /* is_scalar? */ VigraTrueType)
00138         {
00139             typedef typename Accessor::value_type value_type;
00140 
00141             FindMinMax<value_type> extrema;
00142 
00143             inspectImage(upper_left, lower_right, accessor, extrema);
00144 
00145             return range_t(static_cast<double>(extrema.min), static_cast<double>(extrema.max));
00146         }
00147 
00148 
00149         template <class Iterator, class Accessor>
00150         inline static range_t
00151         find_value_range(Iterator upper_left, Iterator lower_right, Accessor accessor,
00152                          /* is_scalar? */ VigraFalseType)
00153         {
00154             typedef typename Accessor::ElementAccessor element_accessor;
00155             typedef typename element_accessor::value_type value_type;
00156 
00157             const int number_of_bands(static_cast<int>(accessor.size(upper_left)));
00158             FindMinMax<value_type> extrema;
00159 
00160             for (int i = 0; i != number_of_bands; ++i)
00161             {
00162                 element_accessor band(i, accessor);
00163 
00164                 inspectImage(upper_left, lower_right, band, extrema);
00165             }
00166 
00167             return range_t(static_cast<double>(extrema.min), static_cast<double>(extrema.max));
00168         }
00169 
00170 
00171         template <class SourceIterator, class SourceAccessor>
00172         inline static range_t
00173         find_source_value_range(const ImageExportInfo& export_info,
00174                                 SourceIterator upper_left, SourceIterator lower_right, SourceAccessor accessor)
00175         {
00176             if (export_info.getFromMin() < export_info.getFromMax())
00177             {
00178                 return range_t(export_info.getFromMin(), export_info.getFromMax());
00179             }
00180             else
00181             {
00182                 typedef typename SourceAccessor::value_type SourceValueType;
00183                 typedef typename NumericTraits<SourceValueType>::isScalar is_scalar;
00184 
00185                 const range_t range(find_value_range(upper_left, lower_right, accessor, is_scalar()));
00186 
00187                 if (range.first < range.second)
00188                 {
00189                     return range_t(range.first, range.second);
00190                 }
00191                 else
00192                 {
00193                     return range_t(range.first, range.first + 1.0);
00194                 }
00195             }
00196         }
00197 
00198 
00199         template <typename T>
00200         inline static range_t
00201         find_destination_value_range(const ImageExportInfo& export_info)
00202         {
00203             if (export_info.getToMin() < export_info.getToMax())
00204             {
00205                 return range_t(export_info.getToMin(), export_info.getToMax());
00206             }
00207             else
00208             {
00209                 return range_t(static_cast<double>(NumericTraits<T>::min()),
00210                                static_cast<double>(NumericTraits<T>::max()));
00211             }
00212         }
00213 
00214 
00215         inline static range_t
00216         find_destination_value_range(const ImageExportInfo& export_info, pixel_t pixel_type)
00217         {
00218             switch (pixel_type)
00219             {
00220             case UNSIGNED_INT_8: return find_destination_value_range<UInt8>(export_info);
00221             case UNSIGNED_INT_16: return find_destination_value_range<UInt16>(export_info);
00222             case UNSIGNED_INT_32: return find_destination_value_range<UInt32>(export_info);
00223             case SIGNED_INT_16: return find_destination_value_range<Int16>(export_info);
00224             case SIGNED_INT_32: return find_destination_value_range<Int32>(export_info);
00225             case IEEE_FLOAT_32: return find_destination_value_range<float>(export_info);
00226             case IEEE_FLOAT_64: return find_destination_value_range<double>(export_info);
00227             default:
00228                 vigra_fail("vigra_ext::detail::find_destination_value_range: not reached");
00229                 return range_t(0.0, 0.0); // NOT REACHED
00230             }
00231         }
00232     } // end namespace detail
00233 } // end namespace vigra
00234 
00235 
00236 #endif // VIGRA_IMPEXBASE_HXX

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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vigra 1.9.0 (Tue Nov 6 2012)