Opencv cvPyrDown and cvPyrUp 函数_c++ opencv pyrup实现代码-优快云博客

本文链接：https://blog.youkuaiyun.com/sunboyiris/article/details/18266745

本文介绍了一种实现图像平滑与下采样的方法，通过高斯内核进行图像平滑并下采样，展示如何使用OpenCV库在C++中实现图像处理功能。包括代码实现与图像展示步骤。

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#include "stdafx.h"
#include <iostream>
#include <highgui.h>
#include <cv.h>

IplImage * doPryDown(IplImage * in,int filter=CV_GAUSSIAN_5x5)
{
  
    IplImage * out=cvCreateImage(cvSize(in->width/2,in->height/2),in->depth,in->nChannels);
    cvPyrDown(in,out,CV_GAUSSIAN_5x5);//filter=7 目前只支持CV_GAUSSIAN_5x5
    return (out);
}

IplImage * doPyrUp(IplImage * in,int filter=CV_GAUSSIAN_5x5)
{
  
    IplImage * out=cvCreateImage(cvSize(in->width*2,in->height*2),in->depth,in->nChannels);
    cvPyrUp(in,out,CV_GAUSSIAN_5x5);//filter=7 目前只支持CV_GAUSSIAN_5x5
    return (out);
}
int main()
{
    cvNamedWindow("in");
    cvNamedWindow("out");
    IplImage * in= cvLoadImage("C:\\Users\\Administrator\\Desktop\\1001.png");
    cvShowImage("in",in);
    IplImage * out = doPryDown(in);
    cvShowImage("out",out);

    cvWaitKey(0);//key point
    cvReleaseImage(&in);
    cvReleaseImage(&out);
    cvDestroyWindow("in");    
    cvDestroyWindow("out");
}

/*
   Smoothes the input image with gaussian kernel and then down-samples it.
   dst_width = floor(src_width/2)[+1],
   dst_height = floor(src_height/2)[+1]
*/
CVAPI(void)  cvPyrDown( const CvArr* src, CvArr* dst,
                        int filter CV_DEFAULT(CV_GAUSSIAN_5x5) );

/*
   Up-samples image and smoothes the result with gaussian kernel.
   dst_width = src_width*2,
   dst_height = src_height*2
*/
CVAPI(void)  cvPyrUp( const CvArr* src, CvArr* dst,
                      int filter CV_DEFAULT(CV_GAUSSIAN_5x5) );