chap09.htm

数字图像处理入门. 一位图像处理高手写的书. 从图像处理的最基础开始,然后慢慢以一些例子做说明,进入图像处理的更高阶段.学习图像处理不可多得的比较朴实的书

  <p style='line-height:
18.0pt'><span lang=EN-US>MessageBox(hWnd,&quot;File c:\\test.pcx not found!&quot;,&quot;Error    
    Message&quot;,</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>MB_OK|MB_ICONEXCLAMATION);</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>return FALSE;</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>读出头信息</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp; </span>&nbsp; fread((char*)&amp;header,1,sizeof(PCXHEAD),PCXfp);</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp; </span>&nbsp; if(header.manufacturer!=0x0a){    
    //<span style='font-family:宋体;
&quot;Times New Roman&quot;'>不是一个合法的</span><span lang=EN-US>PCX</span><span
style='font-family:宋体;"Times New Roman"'>文件</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>MessageBox(hWnd,&quot;Not a valid Pcx file!&quot;,&quot;Error    
    Message&quot;,</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>MB_OK|MB_ICONEXCLAMATION);</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>fclose(PCXfp);</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp; </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    
    return FALSE;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>将文件指针指向调色板开始处</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>fseek(PCXfp,-769L,SEEK_END);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>获取颜色数信息</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>PcxTag=fgetc(PCXfp)&amp;0xff;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>if(PcxTag!=12){    
    //<span style='font-family:宋体;
&quot;Times New Roman&quot;'>非</span><span lang=EN-US>256</span><span
style='font-family:宋体;"Times New Roman"'>色，返回</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp; </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    
    MessageBox(hWnd,&quot;Not a 256 colors Pcx file!&quot;,&quot;Error Message&quot;,</p>   
  <p style='line-height:
18.0pt'><span lang=EN-US>MB_OK|MB_ICONEXCLAMATION);</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>fclose(PCXfp);</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>return FALSE;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span
lang=EN-US>//</span><span style='font-family:宋体;
&quot;Times New Roman&quot;'>创建新的</span><span lang=EN-US>BITMAPFILEHEADER</span><span
style='font-family:宋体;"Times New Roman"'>和</span><span lang=EN-US>BITMAPINFOHEADER</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>memset((char    
    *)&amp;bf,0,sizeof(BITMAPFILEHEADER));&nbsp;&nbsp;&nbsp;&nbsp; </p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>memset((char    
    *)&amp;bi,0,sizeof(BITMAPINFOHEADER));</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>填写</span><span lang=EN-US>BITMAPINFOHEADER</span><span
style='font-family:宋体;"Times New Roman"'>头信息</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biSize=sizeof(BITMAPINFOHEADER);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>得到图象的宽和高</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biWidth=header.xmax-header.xmin+1;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biHeight=header.ymax-header.ymin+1;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biPlanes=1;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biBitCount=8;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bi.biCompression=BI_RGB;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>ImgWidth=bi.biWidth;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>ImgHeight=bi.biHeight;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>NumColors=256;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>LineBytes=(DWORD)WIDTHBYTES(bi.biWidth*bi.biBitCount);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>ImgSize=(DWORD)LineBytes*bi.biHeight;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>填写</span><span lang=EN-US>BITMAPFILEHEADER</span><span
style='font-family:宋体;"Times New Roman"'>头信息</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bf.bfType=0x4d42;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bf.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+</p>
  <p style='line-height:
18.0pt'><span lang=EN-US>NumColors*sizeof(RGBQUAD)+ImgSize;</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>bf.bfOffBits=(DWORD)(NumColors*sizeof(RGBQUAD)+</p>
  <p style='line-height:
18.0pt'><span lang=EN-US>sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER));</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>为新图分配缓冲区</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>if((hImgData=GlobalAlloc(GHND,(DWORD)</p>
  <p style='line-height:18.0pt'><span
lang=EN-US>(sizeof(BITMAPINFOHEADER)+</span></p>
  <p style='line-height:18.0pt'><span
lang=EN-US>NumColors*sizeof(RGBQUAD)+ImgSize)))==NULL)</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>{</p>
  <p style='line-height:
18.0pt'><span lang=EN-US>MessageBox(hWnd,&quot;Error alloc memory!&quot;,&quot;ErrorMessage&quot;,</span></p>
  <p style='line-height:
18.0pt'><span lang=EN-US>MB_OK|MB_ICONEXCLAMATION);</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp; </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    
    fclose(PCXfp);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>return FALSE;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>lpImgData=(LPBITMAPINFOHEADER)GlobalLock(hImgData); 
  </p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>拷贝头信息</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>memcpy(lpImgData,(char    
    *)&amp;bi,sizeof(BITMAPINFOHEADER));</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>lpPtr=(char    
    *)lpImgData+sizeof(BITMAPINFOHEADER);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>为</span><span lang=EN-US>256</span><span style='font-family:
宋体;&quot;Times New Roman&quot;'>色调色板分配内存</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp; </span>&nbsp; hPal=LocalAlloc(LHND,sizeof(LOGPALETTE)+</p>   
  <p style='line-height:
18.0pt'><span lang=EN-US>NumColors* sizeof(PALETTEENTRY));</span></p>
  <p style='line-height:18.0pt'><span
lang=EN-US>pPal =(LOGPALETTE *)LocalLock(hPal);</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp; </span>&nbsp; pPal-&gt;palNumEntries    
    =256;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>pPal-&gt;palVersion    
    = 0x300;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>for    
    (i = 0; i &lt; 256; i++) {</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>//<span
style='font-family:宋体;"Times New Roman"'>读取调色板中的</span><span lang=EN-US>RGB</span><span
style='font-family:宋体;"Times New Roman"'>值</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp; </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    
    pPal-&gt;palPalEntry[i].peRed=(BYTE)fgetc(PCXfp);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>pPal-&gt;palPalEntry[i].peGreen=(BYTE)fgetc(PCXfp);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>pPal-&gt;palPalEntry[i].peBlue=(BYTE)fgetc(PCXfp);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>pPal-&gt;palPalEntry[i].peFlags=(BYTE)0;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>*(lpPtr++)=(unsigned char)pPal-&gt;palPalEntry[i].peBlue;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>*(lpPtr++)=(unsigned char)pPal-&gt;palPalEntry[i].peGreen;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>*(lpPtr++)=(unsigned char)pPal-&gt;palPalEntry[i].peRed;</p>   
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>*(lpPtr++)=0;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>产生新的逻辑调色板</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>hPalette=CreatePalette(pPal);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>LocalUnlock(hPal);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>LocalFree(hPal);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>hDc=GetDC(hWnd);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>if(hPalette){</p>
  <p style='line-height:
18.0pt'><span lang=EN-US>hPrevPalette=SelectPalette(hDc,hPalette,FALSE);</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    </span>RealizePalette(hDc);</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>}</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span
style='font-family:宋体;"Times New Roman"'>解码行所占的字节数</span></p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>PcxBytesPerLine=(unsigned    
    int)header.bytes_per_line;</p>
  <p style='line-height:18.0pt'><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//<span