Opencv操作像素示例

下面的代码对图像中的B分量进行了增强

#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main(int argc, const char * argv[]) {
    // insert code here...
    Mat yyImg = imread("/Users/username/Documents/mine/YY.jpeg");
    Mat yyImgNew;
    resize(yyImg, yyImgNew, cv::Size(300, 300), INTER_AREA);
    int rows = yyImgNew.rows;
    int cols = yyImgNew.cols;
    int channels = yyImg.channels();
    cout<<"rows:"<<rows<<" cols:"<<cols<<" channels:"<<channels<<endl;
    for(int i = 0; i < rows; i++)
    {
        for(int j = 0; j < cols; j++)
        {
            int newValue = yyImgNew.at<Vec3b>(i, j)[0] + 170;
            if(newValue > 255)
            {
                yyImgNew.at<Vec3b>(i, j)[0] = 255;
            } else{
                yyImgNew.at<Vec3b>(i, j)[0] = newValue;
            }
        }
    }
    imshow("YY", yyImgNew);
    std::cout << "Hello, World!\n";
    waitKey();
    return 0;
}

原始图像：

WechatIMG233ORI.png

增强后的图像：

WechatIMG232.png