ぬの部屋(仮)
nu-no-he-ya
  •  123456
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        123
    45678910
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     123456
    78910111213
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    3456789
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    567891011
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    1234567
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    3031     
       1234
    567891011
    12131415161718
    19202122232425
    262728293031 
           
     123456
    78910111213
    14151617181920
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    3456789
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    31      
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    567891011
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    1234567
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      12345
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    23242526272829
    3031     
        123
    45678910
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    252627282930 
           
     123456
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    21222324252627
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     123456
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    3031     
       1234
    567891011
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     123456
    78910111213
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    3456789
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    31      
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    567891011
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    1234567
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    1234567
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    15161718192021
    22232425262728
           
           
        123
    45678910
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    18192021222324
    25262728293031
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
          1
    2345678
    9101112131415
    16171819202122
    23242526272829
    30      
       1234
    567891011
    12131415161718
    19202122232425
    262728293031 
           
     123456
    78910111213
    14151617181920
    21222324252627
    282930    
           
         12
    3456789
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    31      
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    1234567
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    15161718192021
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    2930     
           
        123
    45678910
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    18192021222324
    25262728293031
           
      12345
    6789101112
    13141516171819
    20212223242526
    27282930   
           
          1
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    9101112131415
    16171819202122
    23242526272829
    3031     
         12
    3456789
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      12345
    6789101112
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          1
    2345678
    9101112131415
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    23242526272829
    3031     
        123
    45678910
    11121314151617
    18192021222324
    252627282930 
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
          1
    2345678
    9101112131415
    16171819202122
    23242526272829
    30      
       1234
    567891011
    12131415161718
    19202122232425
    262728293031 
           
    1234567
    891011121314
    15161718192021
    22232425262728
    293031    
           
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    3456789
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      12345
    6789101112
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    1234567
    891011121314
    15161718192021
    22232425262728
    2930     
           
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    45678910
    11121314151617
    18192021222324
    25262728293031
           
        123
    45678910
    11121314151617
    18192021222324
    25262728   
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
         12
    3456789
    10111213141516
    17181920212223
    24252627282930
    31      
       1234
    567891011
    12131415161718
    19202122232425
    2627282930  
           
    1234567
    15161718192021
    293031    
           
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    3456789
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      12345
    6789101112
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    20212223242526
    2728293031  
           
          1
    2345678
    9101112131415
    16171819202122
    23242526272829
    3031     
        123
    45678910
    11121314151617
    18192021222324
    252627282930 
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
          1
    2345678
    9101112131415
    16171819202122
    23242526272829
    30      
       1234
    567891011
    12131415161718
    19202122232425
    262728293031 
           
    1234567
    891011121314
    15161718192021
    22232425262728
    293031    
           
        123
    45678910
    11121314151617
    18192021222324
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    6789101112
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        123
    45678910
    11121314151617
    18192021222324
    252627282930 
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
       1234
    567891011
    12131415161718
    19202122232425
    2627282930  
           
    1234567
    891011121314
    15161718192021
    22232425262728
    293031    
           
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    3456789
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          1
    2345678
    9101112131415
    16171819202122
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    3031     
     123456
    78910111213
    14151617181920
    21222324252627
    282930    
           
         12
    3456789
    10111213141516
    17181920212223
    24252627282930
    31      
    1234567
    891011121314
    15161718192021
    22232425262728
    293031    
           
        123
    45678910
    11121314151617
    18192021222324
    252627282930 
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
     123456
    78910111213
    14151617181920
    21222324252627
    28293031   
           
       1234
    567891011
    12131415161718
    19202122232425
    262728293031 
           
     123456
    78910111213
    14151617181920
    21222324252627
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         12
    3456789
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    24252627282930
    31      
      12345
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    45678910
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    9101112131415
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    3031     
          1
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       1234
    567891011
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    3456789
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  • グレイスケール値をサーモグラフィーのように表示

    thermography.h

    #pragma once
    
    #include <vector>
    #include<cassert>
    
    class Thermography {
      using InputColor = std::array<int, 3>;
      using CalcColor = std::array<double, 3>;
      using OutputColor = std::array<unsigned char, 3>;
    
      std::vector< InputColor > m_ctable;
      double m_dmin;
      double m_dmax;
    private:
    
      template<typename Return>
      Return clamp(Return _min, Return _max, double value) const {
        if (value < _min)
          return _min;
        if (value > _max)
          return _max;
        return value;
      }
    
      //! @brief 0.0~1.0 の範囲のRGBを取得
      CalcColor calc(const int from, const double ratio)const {
        constexpr int R = 0, G = 1, B = 2;
        const int to = from + 1;
    
        double r = (m_ctable[from][R] + (m_ctable[to][R] - m_ctable[from][R]) * ratio) / 255.0;
        double g = (m_ctable[from][G] + (m_ctable[to][G] - m_ctable[from][G]) * ratio) / 255.0;
        double b = (m_ctable[from][B] + (m_ctable[to][B] - m_ctable[from][B]) * ratio) / 255.0;
    
        return CalcColor{r,g,b};
      }
    
      //! @brief 0~255の範囲のRGBを取得
      OutputColor toOutput(const CalcColor& cc)const {
        return
          OutputColor{
            clamp<unsigned char>(0 ,255 ,cc[0] * 255),
            clamp<unsigned char>(0 ,255 ,cc[1] * 255),
            clamp<unsigned char>(0 ,255 ,cc[2] * 255)
        };
    
      }
    
    
    public:
      // @brief カラーテーブルを設定する
      template<class It>
      void setColorTable(It first, It last) {
        for (auto c = first;c!= last;c++)
          m_ctable.push_back(*c);
      }
      // @brief カラーテーブルを設定する
      void setColorTable(
        std::initializer_list< InputColor > colors
      ) {
        setColorTable(colors.begin(), colors.end());
      }
    
      // @brief 着色する値の範囲を設定
      void setArea(double _min, double _max) {
        m_dmin = _min;
        m_dmax = _max;
      }
    
      //! @brief 値をRGB色へ変換
      OutputColor thermography(const double value)const {
        constexpr int R = 0, G = 1, B = 2;
    
        int N = m_ctable.size();
        // 値の正規化
        double nvalue;
        double vwidth = m_dmax - m_dmin;
        nvalue = (value - m_dmin) / vwidth;
    
        int from, to;
        double ratio;
        //////////////////////////////
        // 範囲外
        if (nvalue <= 0.0) {
          from = 0;
          ratio = 0.0;
        }
        else if (nvalue >= 1.0) {
          from = m_ctable.size() - 2;
          ratio = 1.0;
        }
        //////////////////////////////
        // 範囲内なら from ~ to の間で正規化してratioにする
        else {
          from = nvalue * (N - 1);
          to = from + 1;
    
          double NnFrom = from / double(N - 1);
          double NnTo = to / double(N - 1);
          ratio = (nvalue - NnFrom) / (NnTo - NnFrom);
        }
    
        CalcColor rgb = calc(from, ratio);
    
        return toOutput(rgb);
    
      }
    };
    

    呼び出し例

    #include <iostream>
    
    // https://www.study.suzulang.com/2dcg-functions/nbyte-data-type
    #include "NByteData.hpp"
    
    #include "ppmP3_read.hpp"
    
    #include "thermography.h"
    
    #include <vector>
    #include <array>
    
    void ppmP3_write(
      const char* const fname,
      const int width,
      const int height,
      const unsigned char* const p,
      const int vmax
    );
    
    int main()
    {
      using PixelT = NByteData<3>;
    
      std::vector<PixelT> mem;
    
      // 画像読み込み
      int width;
      int height;
      int vmax;
    
      ppmP3_read(
        "C:\\test\\ppp.ppm",
        &width,
        &height,
        &vmax,
        [&mem](const size_t pixelcount) {
        mem.resize(pixelcount);
        return (unsigned char*)&mem[0];
      }
      );
    
    
    
      //////////////////////////////////////////////
      //////////////////////////////////////////////
      std::vector< std::array<int, 3>> ColorTable{
        std::array<int, 3>{ 0 , 0,  0 }, // 黒
        std::array<int, 3>{ 0 , 0, 255}, // 青
        std::array<int, 3>{ 0 ,200,200}, // 水色
        std::array<int, 3>{ 0 ,255, 0 }, // 緑
        std::array<int, 3>{200,200, 0 }, // 橙
        std::array<int, 3>{255, 0 , 0 }, // 赤
        std::array<int, 3>{255,255,255}  // 白
      };
    
      Thermography c;
      c.setArea(0, 255);//この範囲外の値は0,255として扱われる
      c.setColorTable(ColorTable.begin(), ColorTable.end());
      
    
      // 色を反転
      for (auto& p : mem) {
    
        std::array<unsigned char,3> rgb = c.thermography(p.data()[0]);
    
        p.data()[0] = rgb[0];
        p.data()[1] = rgb[1];
        p.data()[2] = rgb[2];
    
        p.data()[0] = (p.data()[0] > 255) ? 255 : p.data()[0];
        p.data()[1] = (p.data()[1] > 255) ? 255 : p.data()[1];
        p.data()[2] = (p.data()[2] > 255) ? 255 : p.data()[2];
    
      }
    
      /////////////////////////////////
      /////////////////////////////////
      ppmP3_write(
        "C:\\test\\qqq.ppm",
        width,
        height,
        (unsigned char*)&mem[0], 255);
    
    }
    
    
    
    //! @brief PPM(RGB各1byte,カラー,テキスト)を書き込む
    //! @param [in] fname ファイル名
    //! @param [in] width 画像の幅
    //! @param [in] height 画像の高さ
    //! @param [in] p 画像のメモリへのアドレス
    //! @param [in] vmax 全てのRGBの中の最大値。普通の画像なら255
    //! @details RGBRGBRGB....のメモリを渡すと、RGBテキストでファイル名fnameで書き込む
    void ppmP3_write(
      const char* const fname,
      const int width,
      const int height,
      const unsigned char* const p,
      const int vmax
    ) {
    
      FILE* fp = fopen(fname, "wb");
      fprintf(fp, "P3\n%d %d\n%d\n", width, height, vmax);
    
      size_t k = 0;
      for (size_t i = 0; i < (size_t)height; i++) {
        for (size_t j = 0; j < (size_t)width; j++) {
          fprintf(fp, "%d %d %d ",
            p[k * 3 + 0],
            p[k * 3 + 1],
            p[k * 3 + 2]
          );
          k++;
        }
        fprintf(fp, "\n");
      }
    
      fclose(fp);
    }
    

    ppmP3_read.hpp

    #include <iostream>
    
    // https://www.study.suzulang.com/2dcg-functions/nbyte-data-type
    #include "NByteData.hpp"
    
    // https://suzulang.com/ppmp3_read-memalloc-ver/
    #include "ppmP3_read.hpp" #include "thermography.h" #include <vector> #include <array> void ppmP3_write( const char* const fname, const int width, const int height, const unsigned char* const p, const int vmax ); int main() { using PixelT = NByteData<3>; std::vector<PixelT> mem; // 画像読み込み int width; int height; int vmax; ppmP3_read( "C:\\test\\ppp.ppm", &width, &height, &vmax, [&mem](const size_t pixelcount) { mem.resize(pixelcount); return (unsigned char*)&mem[0]; } );
      //////////////////////////////////////////////
      //////////////////////////////////////////////
      std::vector< std::array<int, 3>> ColorTable{
        std::array<int, 3>{ 0 , 0,  0 }, // 黒
        std::array<int, 3>{ 0 , 0, 255}, // 青
        std::array<int, 3>{ 0 ,200,200}, // 水色
        std::array<int, 3>{ 0 ,255, 0 }, // 緑
        std::array<int, 3>{200,200, 0 }, // 橙
        std::array<int, 3>{255, 0 , 0 }, // 赤
        std::array<int, 3>{255,255,255}  // 白
      };
    
      Thermography c;
      c.setArea(0, 255);//この範囲外の値は0,255として扱われる
      c.setColorTable(ColorTable.begin(), ColorTable.end());
      
    
      // 色を反転
      for (auto& p : mem) {
    
        std::array<unsigned char,3> rgb = c.thermography(p.data()[0]);
    
        p.data()[0] = rgb[0];
        p.data()[1] = rgb[1];
        p.data()[2] = rgb[2];
    
        p.data()[0] = (p.data()[0] > 255) ? 255 : p.data()[0];
        p.data()[1] = (p.data()[1] > 255) ? 255 : p.data()[1];
        p.data()[2] = (p.data()[2] > 255) ? 255 : p.data()[2];
    
      }
    
      /////////////////////////////////
      /////////////////////////////////
      ppmP3_write(
        "C:\\test\\qqq.ppm",
        width,
        height,
        (unsigned char*)&mem[0], 255);
    
    }
    
    
    
    //! @brief PPM(RGB各1byte,カラー,テキスト)を書き込む
    //! @param [in] fname ファイル名
    //! @param [in] width 画像の幅
    //! @param [in] height 画像の高さ
    //! @param [in] p 画像のメモリへのアドレス
    //! @param [in] vmax 全てのRGBの中の最大値。普通の画像なら255
    //! @details RGBRGBRGB....のメモリを渡すと、RGBテキストでファイル名fnameで書き込む
    void ppmP3_write(
      const char* const fname,
      const int width,
      const int height,
      const unsigned char* const p,
      const int vmax
    ) {
    
      FILE* fp = fopen(fname, "wb");
      fprintf(fp, "P3\n%d %d\n%d\n", width, height, vmax);
    
      size_t k = 0;
      for (size_t i = 0; i < (size_t)height; i++) {
        for (size_t j = 0; j < (size_t)width; j++) {
          fprintf(fp, "%d %d %d ",
            p[k * 3 + 0],
            p[k * 3 + 1],
            p[k * 3 + 2]
          );
          k++;
        }
        fprintf(fp, "\n");
      }
    
      fclose(fp);
    }