均值滤波器与中值滤波器的实现

最新推荐文章于 2025-09-26 10:00:38 发布

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本文介绍了一种图像处理技术中的均值滤波器和中值滤波器的实现方法。均值滤波器通过计算局部窗口内像素的平均值来减少图像噪声，而中值滤波器则通过计算局部窗口内的中值来去除椒盐噪声。这两种方法都是针对灰度图像进行处理。

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//均值滤波器

//nWindowSize 为滤波器窗口大小，取奇数。

// pSrcImage 指向原始图像的指针。

//返回值是指向处理后图像的指针。

#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;
}

//中值滤波器

#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++;