从左上角到右下角的像素积分图

像素积分图计算：

 

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;

int main(int argc, char** argv) {
    Mat src = imread("L:/5.jpg", IMREAD_GRAYSCALE);
    if (src.empty()) {
        printf("could not load image...
");
        return -1;
    }
    namedWindow("input image", CV_WINDOW_AUTOSIZE);
    imshow("input image", src);

    Mat sumii = Mat::zeros(src.rows + 1, src.cols + 1, CV_32FC1); //参数1.左上角像素和
    Mat sqsumii = Mat::zeros(src.rows + 1, src.cols + 1, CV_64FC1);//参数2.左上角像素平方和
    integral(src, sumii, sqsumii);  //积分算法API

    Mat iiResult;
    normalize(sumii, iiResult, 0, 255, NORM_MINMAX, CV_8UC1, Mat());// 归一化
    imshow("Integral Image", iiResult);

    waitKey(0);
    return 0;
}