[opencv] 伪彩色和彩虹图

// OpenCV_1.cpp : 定义控制台应用程序的入口点。
//
//彩虹图的颜色分配取一下值
// R G B gray
//----------------------------------
// 红 255, 0, 0 255
// 橙 255, 127, 0 204
// 黄 255, 255, 0 153
// 绿 0, 255, 0 102
// 青 0, 255, 255 51
// 蓝 0, 0, 255 0

#include "stdafx.h"
#include 
#include 
using namespace cv;

int _tmain(int argc, _TCHAR* argv[])
{

   Mat img = imread("1.bmp", CV_LOAD_IMAGE_GRAYSCALE);//采用灰度格式读取图片
   namedWindow("bmp_img");
   imshow("bmp_img", img);

   Mat img_pseudocolor(img.rows, img.cols, CV_8UC3);//构造RGB图像，参数CV_8UC3教程文档里面有讲解
   int tmp=0;
   for (int y=0;y(y,x);
         img_pseudocolor.at(y,x)[0] = abs(255-tmp); //blue
         img_pseudocolor.at(y,x)[1] = abs(127-tmp); //green
         img_pseudocolor.at(y,x)[2] = abs( 0-tmp); //red
      }
   }
   namedWindow("img_pseudocolor");
   imshow("img_pseudocolor", img_pseudocolor);

 Mat img_color(img.rows, img.cols, CV_8UC3);//构造RGB图像
#define IMG_B(img,y,x) img.at(y,x)[0]
#define IMG_G(img,y,x) img.at(y,x)[1]
#define IMG_R(img,y,x) img.at(y,x)[2]
   uchar tmp2=0;
   for (int y=0;y(y,x);
         if (tmp2 <= 51)
         {
            IMG_B(img_color,y,x) = 255;
            IMG_G(img_color,y,x) = tmp2*5;
            IMG_R(img_color,y,x) = 0;
         }
         else if (tmp2 <= 102)
         {
            tmp2-=51;
            IMG_B(img_color,y,x) = 255-tmp2*5;
            IMG_G(img_color,y,x) = 255;
            IMG_R(img_color,y,x) = 0;
         }
         else if (tmp2 <= 153)
         {
            tmp2-=102;
            IMG_B(img_color,y,x) = 0;
            IMG_G(img_color,y,x) = 255;
            IMG_R(img_color,y,x) = tmp2*5;
         }
         else if (tmp2 <= 204)
         {
            tmp2-=153;
            IMG_B(img_color,y,x) = 0;
            IMG_G(img_color,y,x) = 255-uchar(128.0*tmp2/51.0+0.5);
            IMG_R(img_color,y,x) = 255;
         }
         else
         {
            tmp2-=204;
            IMG_B(img_color,y,x) = 0;
            IMG_G(img_color,y,x) = 127-uchar(127.0*tmp2/51.0+0.5);
            IMG_R(img_color,y,x) = 255;
         }
      }
   }
   namedWindow("img_ rainbowcolor");
   imshow("img_ rainbowcolor", img_color);

   
   
   waitKey(0);
   destroyAllWindows();
 return 0;
}

彩虹图的效果明显比伪彩色要好

 参考:  http://blog.chinaunix.net/uid-26450922-id-3458574.html