OpenCV中的颜色映射函数applyColorMap的使用

• 操作系统：ubuntu22.04
• OpenCV版本：OpenCV4.9
• IDE:Visual Studio Code
• 编程语言：C++11

算法描述

OpenCV 中应用类似于 GNU Octave 或 MATLAB 中的颜色映射，虽然 OpenCV 中的颜色映射类型与 GNU Octave 或 MATLAB 中的颜色映射类型名称不完全相同，但它们在功能上是类似的。

函数原型

void cv::applyColorMap	
(InputArray 	src,OutputArray 	dst,int 	colormap 
)		

参数

• 参数src 源图像，灰度或彩色，类型为 CV_8UC1 或 CV_8UC3。
• 参数dst 结果是带有颜色映射的源图像。注意：Mat::create 会在 dst 上被调用。
• 参数colormap T要应用的颜色映射，参见颜色映射类型（ColormapTypes）。

代码示例

#include <iostream>
#include <opencv2/opencv.hpp>int main( int argc, char** argv )
{// 加载灰度图像cv::Mat grayImage = cv::imread( "/media/dingxin/data/study/OpenCV/sources/images/qiu.jpg", cv::IMREAD_GRAYSCALE );if ( grayImage.empty() ){std::cerr << "Error: Image cannot be loaded!" << std::endl;return -1;}// 创建一个空的 Mat 对象来保存彩色图像cv::Mat colorImage;cv::imshow( "Original Gray Image", grayImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_JET );cv::imshow( "Colored Image COLORMAP_JET", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_BONE );cv::imshow( "Colored Image COLORMAP_BONE", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_HOT );cv::imshow( "Colored Image COLORMAP_HOT", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_COOL );cv::imshow( "Colored Image COLORMAP_COOL", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_SPRING );cv::imshow( "Colored Image COLORMAP_SPRING", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_SUMMER );cv::imshow( "Colored Image COLORMAP_SUMMER", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_AUTUMN );cv::imshow( "Colored Image COLORMAP_AUTUMN", colorImage );cv::applyColorMap( grayImage, colorImage, cv::COLORMAP_WINTER );cv::imshow( "Colored Image COLORMAP_WINTER", colorImage );cv::waitKey( 0 );return 0;
}

运行结果