OpenCV2马拉松第7圈——图像金字塔

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>

using namespace cv;

Mat src, dst, tmp;
const char* window_name = "Pyramids Demo";
int main(int argc,char **argv)
{
  printf( "\n Zoom In-Out demo  \n " );
  printf( "------------------ \n" );
  printf( " * [u] -> Zoom in  \n" );
  printf( " * [d] -> Zoom out \n" );
  printf( " * [ESC] -> Close program \n \n" );

  src = imread(argv[1]);
  if( !src.data )
    { printf(" No data! -- Exiting the program \n");
      return -1; }

  tmp = src;
  dst = tmp;

  namedWindow( window_name, CV_WINDOW_AUTOSIZE );
  imshow( window_name, dst );

  for(;;)
  {
    int c;
    c = waitKey(10);

    if( (char)c == 27 )
      { break; }
    if( (char)c == ‘u‘ )
      { pyrUp( tmp, dst, Size( tmp.cols*2, tmp.rows*2 ) );
        printf( "** Zoom In: Image x 2 \n" );
      }
    else if( (char)c == ‘d‘ )
      { pyrDown( tmp, dst, Size( tmp.cols/2, tmp.rows/2 ) );
        printf( "** Zoom Out: Image / 2 \n" );
      }

    imshow( window_name, dst );
    tmp = dst;
   }

   return 0;
}

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <vector>
#include <sstream>

using namespace cv;
using namespace std;

Mat src,tmp;
vector<Mat>gaussPyrs;
vector<Mat>DOG;
int maxLevel = 3;

int main(int argc,char **argv)
{
  	src = imread(argv[1]);
  	if( !src.data ){ 
  		printf(" No data! -- Exiting the program \n");
      	return -1; 
	}

	buildPyramid(src, gaussPyrs, maxLevel);
	
	for(int i = 0;i < maxLevel;i++){
		Size ss;
		pyrUp( gaussPyrs[i+1], tmp, ss); 
		Mat dst = gaussPyrs[i] - tmp;
		DOG.push_back(dst);
	}
	
	for(int i = 0;i < maxLevel;i++){
		stringstream ss;
		ss << i;
		string s;
		ss >> s;
		namedWindow( s, CV_WINDOW_AUTOSIZE );
  		imshow( s, DOG[i] );
	}
	
	waitKey(0);
  	return 0;
}