opencv分离RGB三通道

注：本文非标准教程，仅是总结个人学习过程，可能存在纰漏，如有错误之处欢迎留言告知，非常感谢

本文用RGB通道来改变图像颜色。

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/core/core.hpp>using namespace std;
using namespace cv;
int R = 10, G = 10, B = 10;
static Mat frame;
//1//
//1//
//2//
vector<Mat> channels;
Mat channels1, channels2, channels3;
Mat img_color_channel;
vector<Mat> newChannels;//2//
static void callbackAdjust(int, void *);
int main()
{frame = imread("1.jpg");//2//split(frame, channels);channels1 = channels[0];//获取通道1channels2 = channels[1];//获取通道2channels3 = channels[2];//获取通道3//2//namedWindow("test");createTrackbar("R", "test", &R, 255, callbackAdjust);createTrackbar("G", "test", &G, 255, callbackAdjust);createTrackbar("B", "test", &B, 255, callbackAdjust);/*for (;;){*///cap >> frame;imshow("src", frame);callbackAdjust(0, 0);waitKey(0);
//}return 0;
}//static void callbackAdjust(int, void *)
//{//  //2//
//  for (int i = 0; i < frame.rows; i++)
//  {//      for (int j = 0; j < frame.cols; j++)
//      {//          channels3.at<Vec3b>(i, j)[0] += B;
//          channels2.at<Vec3b>(i, j)[1] += G;
//          channels1.at<Vec3b>(i, j)[2] += R;
//      }
//  }
//  newChannels.push_back(channels3);
//  newChannels.push_back(channels2);
//  newChannels.push_back(channels1);
//  merge(newChannels, img_color_channel);
//  imshow("test", img_color_channel);
//  //2//
//}static void callbackAdjust(int , void *)
{Mat img_color_channel(frame.rows, frame.cols, CV_8UC3);for (int i = 0; i < frame.rows; i++){for (int j = 0; j < frame.cols; j++){img_color_channel.at<Vec3b>(i,j)[2] = frame.at<Vec3b>(i,j)[2] ;img_color_channel.at<Vec3b>(i,j)[1] = frame.at<Vec3b>(i,j)[1] ;img_color_channel.at<Vec3b>(i,j)[0] = frame.at<Vec3b>(i,j)[0] ;}}for (int i = 0; i < frame.rows; i++){for (int j = 0; j < frame.cols; j++){img_color_channel.at<Vec3b>(i,j)[2] += R ;img_color_channel.at<Vec3b>(i,j)[1] += G ;img_color_channel.at<Vec3b>(i,j)[0] += B ;}}imshow("test", img_color_channel);
}

emmmmm炸了。。

所以改代码。。。。。。

#include<opencv2/opencv.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<iostream>using namespace std;
using namespace cv;int aSlider_1, aSlider_2, aSlider_3;
double Blue, Green, Red;
int Max = 100;void on_Trackbar_1(int, void*)
{Blue = (double)aSlider_1;
}
void on_Trackbar_2(int, void*)
{Green = (double)aSlider_2;
}
void on_Trackbar_3(int, void*)
{Red = (double)aSlider_3;
}bool MultiChannelBlending()
{while (1){Mat frame=imread("1.jpg");Mat temp1(frame.rows, frame.cols, CV_8UC3, Scalar(0, 0, 0));Mat temp2(frame.rows, frame.cols, CV_8UC3, Scalar(0, 0, 0));Mat temp3(frame.rows, frame.cols, CV_8UC3, Scalar(0, 0, 0));Mat temp4(frame.rows, frame.cols, CV_8UC3, Scalar(0, 0, 0));createTrackbar("蓝%d", "red", &aSlider_1, Max, on_Trackbar_1);createTrackbar("绿%d", "red", &aSlider_2, Max, on_Trackbar_2);createTrackbar("红%d", "red", &aSlider_3, Max, on_Trackbar_3);for (int i = 0; i < frame.rows; i++){for (int j = 0; j < frame.cols; j++){int red = frame.at<Vec3b>(i, j)[2];temp1.at<Vec3b>(i, j)[2] = red * Red / Max;int blue = frame.at<Vec3b>(i, j)[0];temp1.at<Vec3b>(i, j)[0] = blue * Blue / Max;int green = frame.at<Vec3b>(i, j)[1];temp1.at<Vec3b>(i, j)[1] = green * Green / Max;}}on_Trackbar_1(aSlider_1, 0);on_Trackbar_2(aSlider_2, 0);on_Trackbar_3(aSlider_3, 0);imshow("girlfriend", temp1);imshow("girlfriend", frame);int num = waitKey(1);if ((char)num == 30)break;}return 0;
}
int main()
{if (MultiChannelBlending()){cout << endl << "\n!";}waitKey(0);
}

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