OpenCV自带颜色表操作

用OpenCV自带颜色表改变图像色彩

函数

1. colormap（色度图）

OpenCV的定义colormap（色度图），可以应用于灰度图像，使用函数applycolormap产生伪彩色图像。

//定义ColormapTypes 枚举数据类型
enum ColormapTypes
{COLORMAP_AUTUMN = 0, //!< ![autumn](pics/colormaps/colorscale_autumn.jpg)COLORMAP_BONE = 1, //!< ![bone](pics/colormaps/colorscale_bone.jpg)COLORMAP_JET = 2, //!< ![jet](pics/colormaps/colorscale_jet.jpg)COLORMAP_WINTER = 3, //!< ![winter](pics/colormaps/colorscale_winter.jpg)COLORMAP_RAINBOW = 4, //!< ![rainbow](pics/colormaps/colorscale_rainbow.jpg)COLORMAP_OCEAN = 5, //!< ![ocean](pics/colormaps/colorscale_ocean.jpg)COLORMAP_SUMMER = 6, //!< ![summer](pics/colormaps/colorscale_summer.jpg)COLORMAP_SPRING = 7, //!< ![spring](pics/colormaps/colorscale_spring.jpg)COLORMAP_COOL = 8, //!< ![cool](pics/colormaps/colorscale_cool.jpg)COLORMAP_HSV = 9, //!< ![HSV](pics/colormaps/colorscale_hsv.jpg)COLORMAP_PINK = 10, //!< ![pink](pics/colormaps/colorscale_pink.jpg)COLORMAP_HOT = 11, //!< ![hot](pics/colormaps/colorscale_hot.jpg)COLORMAP_PARULA = 12, //!< ![parula](pics/colormaps/colorscale_parula.jpg)COLORMAP_MAGMA = 13, //!< ![magma](pics/colormaps/colorscale_magma.jpg)COLORMAP_INFERNO = 14, //!< ![inferno](pics/colormaps/colorscale_inferno.jpg)COLORMAP_PLASMA = 15, //!< ![plasma](pics/colormaps/colorscale_plasma.jpg)COLORMAP_VIRIDIS = 16, //!< ![viridis](pics/colormaps/colorscale_viridis.jpg)COLORMAP_CIVIDIS = 17, //!< ![cividis](pics/colormaps/colorscale_cividis.jpg)COLORMAP_TWILIGHT = 18, //!< ![twilight](pics/colormaps/colorscale_twilight.jpg)COLORMAP_TWILIGHT_SHIFTED = 19 //!< ![twilight shifted](pics/colormaps/colorscale_twilight_shifted.jpg)
};

引用举例

int colormap[] = {COLORMAP_AUTUMN,COLORMAP_BONE,COLORMAP_JET,COLORMAP_WINTER,COLORMAP_RAINBOW,COLORMAP_OCEAN,COLORMAP_SUMMER,COLORMAP_SPRING,COLORMAP_COOL,COLORMAP_PINK,COLORMAP_HOT,COLORMAP_PARULA,COLORMAP_MAGMA,COLORMAP_INFERNO,COLORMAP_PLASMA,COLORMAP_VIRIDIS,COLORMAP_CIVIDIS,COLORMAP_TWILIGHT,COLORMAP_TWILIGHT_SHIFTED,};

2. applyColorMap（） 伪彩色函数

//定义
CV_EXPORTS_W void applyColorMap(InputArray src, OutputArray dst, int colormap);

参数	说明
src	源图像（灰度图或彩色图（CV_8UC1 or CV_8UC3））
dst	在源图像上进行色彩映射后的结果图像
colormap	提供的色彩图代码值（参见：ColormapTypes 枚举数据类型）

例

applyColorMap(image,dst,colormap[index%20]);//index%20 保证colorMap里面的参数在colormap[0-19]之间,以方便选择枚举数据类型中的成员

代码

#pragma once#include <opencv2\highgui.hpp>#include <opencv2\imgproc.hpp>using namespace cv;
//定义类
class QuickDemo{
public:void colorSpace_Demo(Mat &image);//色彩空间转换函数2021-12-24void mat_creation_demo(Mat &image);//Mat对象与创建2021-12-27void pixel_vist_Demo(Mat &image);//图像像素的读写操作2022-1-3void operators_demo(Mat &image);//图像像素的算数操作2022-1-4void tracking_bar_demo(Mat &image);//滚动条操作演示2022-1-7void key_demo(Mat &image);//键盘响应操作2022-1-12void color_style_demo(Mat &image);//OpenCV自带颜色表操作2022-1-12
};

QuickDemo.cpp

#include <opencv2\highgui.hpp>#include <opencv2\imgproc.hpp>#include<quickopencv.h>#include <iostream>
void QuickDemo::color_style_demo(Mat &image)
{int colormap[] = {COLORMAP_AUTUMN,COLORMAP_BONE,COLORMAP_JET,COLORMAP_WINTER,COLORMAP_RAINBOW,COLORMAP_OCEAN,COLORMAP_SUMMER,COLORMAP_SPRING,COLORMAP_COOL,COLORMAP_PINK,COLORMAP_HOT,COLORMAP_PARULA,COLORMAP_MAGMA,COLORMAP_INFERNO,COLORMAP_PLASMA,COLORMAP_VIRIDIS,COLORMAP_CIVIDIS,COLORMAP_TWILIGHT,COLORMAP_TWILIGHT_SHIFTED,COLORMAP_HSV,};Mat dst;int index = 0;while (true){int c = waitKey(1000);if (c == 27){break;}applyColorMap(image,dst,colormap[index%20]);//index%19 保证colorMap里面的参数在0-18之间index++;imshow("色彩风格", dst);}
}

OpencvTest.cpp

#include <iostream>
#include <opencv2\highgui.hpp>
#include <opencv2\imgproc.hpp>
#include<quickopencv.h>using namespace cv;
using namespace std;int main()
{Mat scr = imread("...\\image\\1.jpg");//打开一张图if (!scr.data == 1)//判空return -1;namedWindow("窗口1", WINDOW_NORMAL);//创建 WINDOW_FREERATIO窗口imshow("窗口1",scr);//在创建的窗口显示QuickDemo qd;qd.color_style_demo(scr);waitKey(0);return 0;
}

显示效果

20个颜色间隔1秒依次显示，按ESC键退出程序