均值濾波器與中值濾波器的實現

//均值濾波器

//nWindowSize 爲濾波器窗口大小，取奇數。

// pSrcImage 指向原始圖像的指針。

//返回值是 指向處理後圖像的指針。

#include "StdAfx.h"
#include "filterfunction.h"

IplImage* meanfilter(const IplImage* pSrcImage,int nWindowSize)
{
    int nRadius = (nWindowSize-1)/2;
 //
 if (pSrcImage->nChannels!=1)
    {
  MessageBox(NULL,"Images with more than one channel are not surpported yet.^_^", "Error", MB_OK);
  //handle error here
  return 0;
    }
 //handle image with one channel
 IplImage* pDesImage = cvCloneImage(pSrcImage);
 int nSumWindow = 0;
 for (int i = nRadius; i < pSrcImage->height-nRadius; i++)
 {
  for (int j = nRadius; j < pSrcImage->widthStep-nRadius; j++)
  {
           
    nSumWindow = 0;
    for (int m = -nRadius; m <= nRadius; m++)
    {
     for (int n = -nRadius; n <= nRadius; n++)
     {
      nSumWindow = nSumWindow + (unsigned char) (pSrcImage->imageData[pSrcImage->widthStep*(i+m)+j+n]);
     }

    }   
    pDesImage->imageData[pDesImage->widthStep*i + j] = (unsigned char)(nSumWindow/(nWindowSize*nWindowSize));
 
  }
 }
 return pDesImage;
}

//中值濾波器

 

#include "StdAfx.h"
#include "filterfunction.h"

unsigned char FindMedianValue(unsigned char* array,int nLength);

IplImage* medianfilter(const IplImage* pSrcImage,int nWindowSize)
{
 int nRadius = (nWindowSize-1)/2;
 //
 if (pSrcImage->nChannels!=1)
    {
  MessageBox(NULL,"Images with more than one channel are not surpported yet.^_^", "Error", MB_OK);
  //handle error here
  return 0;
    }
 //handle image with one channel
 IplImage* pDesImage = cvCloneImage(pSrcImage);

 
 unsigned char* pWindowData = new unsigned char[nWindowSize*nWindowSize];
 memset(pWindowData,0,nWindowSize*nWindowSize*sizeof(char));
 unsigned char* ptemp = pWindowData;

 for (int i = nRadius; i < pSrcImage->height-nRadius; i++)
 {
  for (int j = nRadius; j < pSrcImage->widthStep-nRadius; j++)
  {
   ptemp = pWindowData;
            for (int m = -nRadius;m <= nRadius;m++)
   {
    for (int n = -nRadius;n <= nRadius;n++)
    {
     *ptemp = (unsigned char) (pSrcImage->imageData[pSrcImage->widthStep*(i+m)+j+n]);
     ptemp++;
    }
            }
            pDesImage->imageData[pSrcImage->widthStep*i+j] = FindMedianValue(pWindowData,nWindowSize*nWindowSize);       
  
  }
 }
 //delete pWindowData;
 return pDesImage;
}

unsigned char FindMedianValue(unsigned char* array,int nLength)
{
 //冒泡
 unsigned char* ptemp = array;
 unsigned char ntemp = 0;
 for (int i = 0;i < nLength;i++)
 {
  ptemp = array;
 
  for (int j = 0;j < nLength-i;j++)
  {
   if(*ptemp > *(ptemp+1))
   {
    ntemp = *ptemp;
    *ptemp = *(ptemp+1);
    *(ptemp+1) = ntemp; 
    ptemp++;
   }else
    ptemp++;

  }
 }

 return *(array+(nLength-1)/2);

}