图像的邻域处理.ppt

第7章

图像的邻域处理;7.1邻点与邻域处理;图像镶嵌边框与去除边框;7.1.2图像卷积运算;图像卷积计算过程;图像处理中卷积的特点;voidConvolution(CImage*pNewImage,CImage*pOldImage,charOperator[5][5],intnScale,intnOffset,intnOperatorWidth,intnOperatorHeight)

{ …

CopyImage(pNewImage,pOldImage);

nWidth=pOldImage-GetWidth();

nHeight=pOldImage-GetHeight();

for(y=nOperatorHeight/2;ynHeight-nOperatorHeight/2;y++)

for(x=nOperatorWidth/2;xnWidth-nOperatorWidth/2;x++)

{

nNewPixel=0;

for(i=0;inOperatorHeight;i++)

for(j=0;jnOperatorWidth;j++) nNewPixel+=(int)Operator[i][j]*

(BYTE)GetPixelValue(pOldImage,(x-nOperatorWidth/2)+j,(y-nOperatorHeight/2)+i);

nNewPixel=nNewPixel/nScale+nOffset;

if(nNewPixel0xff)

nNewPixel=0xff;

else

if(nNewPixel0)

nNewPixel=0;

SetPixelValueInIndexImage(pNewImage,x,y,(BYTE)nNewPixel);

}

};7.2图像平滑;7.2.2图像平滑－邻域平均法;图像平滑－平滑模板法;voidCImageView::OnSmoothByAverage5()

{

…//去除屏幕

…//显示工作画布中的原始图象

//设置五点平均算子

SetOperatorOfAverage5(Operator);

//卷积图像

AddImageOneEdge(Image1,WorkCanvus);//图像加边

Convolution(Image2,Image1,Operator,5,0,3,3);//图像与算子卷积

SubtractImageOneEdge(SaveCanvus,Image2);//图像去边

…//画五点平均平滑后图象

}

voidSetOperatorOfAverage5(charOperator[5][5])

{

Operator[0][0]=0;Operator[0][1]=1;Operator[0][2]=0;

Operator[1][0]=1;Operator[1][1]=1;Operator[1][2]=1;

Operator[2][0]=0;Operator[2][1]=1;Operator[2][2]=0;

};五点平均;7.2.3中值滤波;中值滤波特点;voidMedianFilteringOf5Points(CImage*pNewImage,CImage*pOldImage)

{

int y,x,nWidth,nHeight;

BYTE Neighbor[20],cNewPixel;

nWidth=pOldImage-GetWidth();

nHeight=pOldImage-GetHeight();

if(!pNewImage-IsNull())

pNewImage-Destroy();//如果画布pNewImage非空,那么去除原有图像(原位图)

pNewImage-Create(nWidth,nHeight,pOldImage-GetBPP());

CopyColorTables(pNewImage,pOldImage);//复制调色板

for(y=1;ynHeight-1;y++)

for(x=1;xnWidth-1;x++)

{//取本点和4邻点数据

Neighbor[0]=(BYTE)GetPixelValue(pOldImage,x,y-1);

Neighbor[1]=(BYTE)GetPixelValue(pOldImage,x,y);

Neighbor[2]=(BYTE)Get