opencv学习笔记8 高斯金字塔，拉普拉斯金字塔，调整大小

迷南。 2023-06-04 03:55 19阅读 0赞

一。图像金字塔

高斯金字塔用来向下降采样图像

拉普拉斯金字塔用来从金字塔底层图像中向上采样重建一个图像

1.像上采样

void pyrUp(InputArray src, OutputArraydst, const Size& dstsize=Size(), int borderType=BORDER\_DEFAULT )

![1615707-20190912183922653-51696195.png][]

2.向下采样

void pyrDown(InputArray src,OutputArray dst, const Size& dstsize=Size(), int borderType=BORDER\_DEFAULT)

![1615707-20190914150303866-442290771.png][]

1 #include<opencv.hpp>
     2 using namespace cv;
     3 int main()
     4 {
     5     Mat src = imread("F:/opencv/lena.jpg");
     6     Mat pyrup,pyrdown;
     7     pyrUp(src, pyrup, Size(src.cols * 2, src.rows * 2)); //图片放大
     8     pyrDown(src, pyrdown, Size(src.cols / 2, src.rows / 2)); //图片缩小
     9     imshow("src", src);
    10     imshow("pyrup", pyrup);
    11     imshow("pyrdown", pyrdown);
    12     waitKey();
    13     return 0;
    14 }

二。调整图像大小

void resize(InputArray src,OutputArray dst, Size dsize, double fx=0, double fy=0, int interpolation=INTER\_LINEAR )

![1615707-20190912181101861-669557765.png][]

1 #include<iostream>
     2 #include<vector>
     3 #include<opencv2/opencv.hpp>
     4 using namespace std;
     5 using namespace cv;
     6 int main() 
     7 {
     8     Mat src = imread("E:/test.jpg");
     9     Mat dst1, dst2 = Mat::zeros(1000, 1000,CV_8UC3);
    10     imshow("src", src);
    11     resize(src, dst1, Size(), 0.5, 0.5);
    12     imshow("dst1", dst1);
    13     resize(src, dst2, dst2.size());
    14     imshow("dst2", dst2);
    15     waitKey();
    16     return 0;
    17 }

![1615707-20190912182348430-1821035015.png][]

转载于:https://www.cnblogs.com/sclu/p/11514599.html

[1615707-20190912183922653-51696195.png]: /images/20230601/618754aefed743d58bd7cbea0041c033.png
[1615707-20190914150303866-442290771.png]: /images/20230601/07f6e14688ca4013b3f5de3598e51cf2.png
[1615707-20190912181101861-669557765.png]: /images/20230601/6b5a46a1707d4fa394890c67e9ea591d.png
[1615707-20190912182348430-1821035015.png]: /images/20230601/43057471adb3468fb9cef869d81d76bb.png