Opencv第四講：分離合並通道

前言：

開發環境：win10 Visual Studio 2017

開發語言：C++

編譯器：Debug X64

Opencv版本：4.1.1

代碼實現：

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace cv;
using namespace std;

bool MultiChannelBlending();

int main()
{
	system("color 0F");

	if (MultiChannelBlending())
	{
		cout << endl << "OK! Please start your performance ! ";
	}

	while (1)
	{
		if (waitKey(100) == 27)
			break;
	}
}

bool MultiChannelBlending()
{
	Mat Background, Bull, Rocket, Celts, Toronto, NewYork, Pelicans;
	Mat  BlueChannelsBackground, BlueChannelsBull, BlueChannelsSpur;
	Mat  GreenChannelsBackground, GreenChannelsCelts, GreenChannelsToronto;
	Mat  RedChannelsBackground,RedChannelsNewYork, RedChannelsPelicans;
	vector<Mat>ChannelsBackground, ChannelsBull, ChannelsSpur, ChannelsCelts, ChannelsToronto, ChannelsNewYork, ChannelsPelicans;

	//【1】讀入圖片
	Background = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\背景.png");
	Bull = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\bull.png");
	Rocket = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\火箭.png");
	Celts = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\凱爾特人.png");
	Toronto = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\猛龍.png");
	NewYork = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\NewYork.png");
	Pelicans = imread("D:\\vs2017_Project\\5th-Separate_and_combine_channels\\鵜鶘.png");

	//【2】把一個3通道圖像轉換成3個單通道圖像
	split(Background, ChannelsBackground);//分離色彩通道
	split(Bull, ChannelsBull);//分離色彩通道
	split(Rocket, ChannelsSpur);//分離色彩通道
	split(Celts, ChannelsCelts);//分離色彩通道
	split(Toronto, ChannelsToronto);//分離色彩通道
	split(NewYork, ChannelsNewYork);//分離色彩通道
	split(Pelicans, ChannelsPelicans);//分離色彩通道

	//【3】將原圖的某通道引用返回給imageBlueChannel，注意是引用，相當於兩者等價，修改其中一個另一個跟着變
	// 【3-1】藍色通道
	BlueChannelsBackground = ChannelsBackground.at(0);
	BlueChannelsBull = ChannelsBull.at(2);
	BlueChannelsSpur = ChannelsSpur.at(0);
	// 【3-2】綠色通道
	GreenChannelsBackground = ChannelsBackground.at(1);
	GreenChannelsCelts = ChannelsCelts.at(1);
	GreenChannelsToronto = ChannelsToronto.at(1);
	// 【3-3】紅色通道
	RedChannelsBackground = ChannelsBackground.at(2);
	RedChannelsNewYork = ChannelsNewYork.at(2);
	RedChannelsPelicans = ChannelsPelicans.at(2);

	//【4】將原圖的某通道的某座標處下的一塊區域和logo圖進行加權操作，將得到的混合結果存到對應背景圖的通道中
	// 【4-1】藍色通道
	addWeighted(BlueChannelsBackground(Rect(0, 220, Bull.cols, Bull.rows)), 1.0, BlueChannelsBull, 0.5, 0,BlueChannelsBackground(Rect(0, 220, Bull.cols, Bull.rows)));
	addWeighted(BlueChannelsBackground(Rect(0, 0, Rocket.cols, Rocket.rows)), 1.0, BlueChannelsSpur, 0.5, 0,BlueChannelsBackground(Rect(0, 0, Rocket.cols, Rocket.rows)));
	// 【4-2】綠色通道
	addWeighted(GreenChannelsBackground(Rect(220, 0, Celts.cols, Celts.rows)), 1.0,GreenChannelsCelts, 0.5, 0, GreenChannelsBackground(Rect(220, 0, Celts.cols, Celts.rows)));
	addWeighted(GreenChannelsBackground(Rect(220, 220, Toronto.cols, Toronto.rows)), 1.0,GreenChannelsToronto, 0.5, 0, GreenChannelsBackground(Rect(220, 220, Toronto.cols, Toronto.rows)));
	// 【4-3】紅色通道
	addWeighted(RedChannelsBackground(Rect(440, 0, NewYork.cols, NewYork.rows)), 1.0, RedChannelsNewYork, 0.5, 0, RedChannelsBackground(Rect(440, 0, NewYork.cols, NewYork.rows)));
	addWeighted(RedChannelsBackground(Rect(440, 220, Pelicans.cols, Pelicans.rows)), 1.0, RedChannelsPelicans, 0.5, 0, RedChannelsBackground(Rect(440, 220, Pelicans.cols, Pelicans.rows)));

	//【5】將三個單通道重新合併成一個三通道
	merge(ChannelsBackground, Background);  // 注意，這裏是將三個合併後的單通道再次合併爲一個三通道，只需要一步操作！

	//【6】顯示效果圖
	imshow("NBA", Background);
	

	return true;
}

結果：

參考資料：

https://blog.csdn.net/poem_qianmo/article/details/21176257

https://blog.csdn.net/gdfsg/article/details/50927257