OpenCV学习(十四)之彩色图像RGB通道的分离、合并与显示

悠悠 2022-08-06 06:13 241阅读 0赞

由于算法的需要，需要把彩色图像的R、G、B值分离出来，OpenCV中正好有split() 和 merge() 函数可以实现。

实验环境：VS2010 + OpenCV2.4.9

一、对单独彩色图片的RGB通道分离：

#include <iostream>
    #include "cv.h"
    #include "highgui.h"
    
    using namespace std;
    using namespace cv;
    
    int main(int argc,char* argv[])
    {
    	Mat img = imread("lena.jpg"/*,CV_LOAD_IMAGE_COLOR*/);
    	Mat channel[3];
    	split(img,channel);
    	imshow("original",img);
    	imshow("B",channel[0]);
    	imshow("G",channel[1]);
    	imshow("R",channel[2]);
    
    	//set blue channel to 0
    	channel[0] = Mat::zeros(img.rows,img.cols,CV_8UC1);
    	//merge red and green channels
    	merge(channel,3,img);
    	imshow("R_G_merge",img);
    
    	waitKey(0);
    	return 1;
    }

下面是实验图片：

第一张是原始图片：

![20141229101710896][]

![20141229101913372][]

![20141229101933406][]

![20141229101920532][]

![20141229102019750][]

二、对摄像头摄入视频帧的RGB彩色通道分离

int main(int argc,char* argv[])
    {
    	VideoCapture cap;
    	cap.open(0);
    
    	if(!cap.isOpened()) 
    	{
    		exit(0);
    	}
    
    	cap.set(CV_CAP_PROP_FRAME_WIDTH,250);
    	cap.set(CV_CAP_PROP_FRAME_HEIGHT,250);
    
    	cout << "Frame Width: " << cap.get(CV_CAP_PROP_FRAME_WIDTH) << endl;
    	cout << "Frame Height: " << cap.get(CV_CAP_PROP_FRAME_HEIGHT) << endl;
    
    	Mat frame;
    	vector<Mat> rgb;
    	cap >> frame;
    
    	//rgb.push_back( Mat(frame.rows, frame.cols, CV_8UC1));
    	//rgb.push_back( Mat(frame.rows, frame.cols, CV_8UC1));
    	//rgb.push_back( Mat(frame.rows, frame.cols, CV_8UC1));
    	//rgb.push_back( Mat(frame.rows, frame.cols, CV_8UC1));
    
    	namedWindow("original", 1);
    	namedWindow("red", 1);
    	namedWindow("green", 1);
    	namedWindow("blue", 1);
    
    	for(;;)
    	{
    		cap >> frame;
    		imshow("original", frame);
    		split(frame, rgb);
    
    		imshow("red", rgb.at(2));
    		imshow("green", rgb.at(1));
    		imshow("blue", rgb.at(0));
    
    		if(waitKey(30) >= 0) 
    			break;
    	}
    
    	waitKey(0);
    	return 1;
    }

![20141229113038590][]

上帝之手，O(∩\_∩)O哈哈~

[20141229101710896]: /images/20220806/699d49bee35d46319f261010f3d77e21.png
[20141229101913372]: /images/20220806/92f3bea19027422fb3db82dff5a58ebb.png
[20141229101933406]: /images/20220806/a2d305c00f7b4310acfe83311e5baa4f.png
[20141229101920532]: /images/20220806/dab0a181a2d74ae79fe7fd82f2fd580b.png
[20141229102019750]: /images/20220806/8ff21ae2322f4c8482e5f418b411027b.png
[20141229113038590]: /images/20220806/b7e8786a766b4bc98a193a567bca12c1.png