opencv学习(6)——图像金字塔

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#include "opencv2/imgproc/imgproc.hpp"#include "opencv2/imgcodecs.hpp"#include "opencv2/highgui/highgui.hpp"#include <math.h>#include <stdlib.h>#include <stdio.h>using namespace cv;/// Global variablesMat src, dst, tmp;const char* window_name = "Pyramids Demo";/** * @function main */int main( void ){  /// General instructions  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" );  /// Test image - Make sure it s divisible by 2^{n} src=imread("D:\\software_anz\\opencv\\opencv\\sources\\samples\\data\\HappyFish.jpg" );  if( src.empty() )    { printf(" No data! -- Exiting the program \n");      return -1; }  tmp = src;  dst = tmp;  /// Create window  namedWindow( window_name, WINDOW_AUTOSIZE );  imshow( window_name, dst );  /// Loop  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;}

1.waitKey()函数
int waitKey( int delay=0 )
返回值为int型，函数的参数为int型，当delay小于等于0的时候，如果没有键盘触发，则一直等待，此时的返回值为-1，否则返回值为键盘按下的码字；当delay大于0时，如果没有键盘的的触发，则等待delay的时间，此时的返回值是-1，否则返回值为键盘按下的码字。
2.pyrDown与pyrUp分别表示向下降采样与向上升采样，但是二者并不是互为逆操作；
void pyrDown(InputArray src, OutputArray dst, const Size& dstsize=Size(), int border-Type=BORDER_DEFAULT )
void pyrUp(InputArray src, OutputArray dst, const Size& dstsize=Size(), int border-Type=BORDER_DEFAULT )

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