Matlab使用colormap Jet 可以将灰度图像生成彩色的热度图，灰度值越高，色彩偏向暖色调。相反亦然。

// ColorMap.h

#ifndef COLORMAP_H

#define COLORMAP_H

class colormap

{

public:

static void GroundColorMix(BYTE* color, double x, double min, double max);

static void Convert2Colormap(BYTE* Image, int *imSize);

};

#endif

//ColorMap.cpp

#include "ColorMap.h"

#define BChannel 2

#define GChannel 1

#define RChannel 0

void colormap::GroundColorMix(BYTE* color, double x, double min, double max)

{

double posSlope = (max-min)/60;

double negSlope = (min-max)/60;

if( x < 60 )

{

color[RChannel] = max;

color[GChannel] = posSlope*x+min;

color[BChannel] = min;

return;

}

else if ( x < 120 )

{

color[RChannel] = negSlope*x+2*max+min;

color[GChannel] = max;

color[BChannel] = min;

return;

}

else if ( x < 180 )

{

color[RChannel] = min;

color[GChannel] = max;

color[BChannel] = posSlope*x-2*max+min;

return;

}

else if ( x < 240 )

{

color[RChannel] = min;

color[GChannel] = negSlope*x+4*max+min;

color[BChannel] = max;

return;

}

else if ( x < 300 )

{

color[RChannel] = posSlope*x-4*max+min;

color[GChannel] = min;

color[BChannel] = max;

return;

}

else

{

color[RChannel] = max;

color[GChannel] = min;

color[2] = negSlope*x+6*max;

return;

}

}

void colormap::Convert2Colormap(BYTE* Image, int *imSize)

//Image为三通道的灰度图像，R=G=B

{

const int stride = imSize[1]*imSize[2];

const int height = imSize[0];

const int width = imSize[1];

for (int i=0; i

{

BYTE *rowIndex = &Image[i*stride];

for (int j=0; j

{

GroundColorMix(&rowIndex[j],rowIndex[j],0.0,255.0);

}

}

}

#undef BChannel

#undef GChannel

#undef RChannel

结果图