VC6.0图像处理3--灰度变换

源码下载：

//书接前文，我们继续看一些灰度操作，由于比较简单，我们多放几个函数

//添加菜单以及处理函数

void CBMPViewerDoc::OnMenuitem32777() //灰度拉伸 { // TODO: Add your command handler code here int linewidth; linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4; int r1 = 60; int r2 = 200; double k = 1.5; // TODO: Add your command handler code here // TODO: Add your command handler code here for(int i = 0 ; i< bi.biHeight ; i++){ for(int j = 0 ; j< bi.biWidth ; j++){ unsigned char *lpScr; lpScr = (unsigned char *)lpBuf+linewidth*(bi.biHeight - i -1) + j; // *(lpScr) = BYTE((*lpScr - min)*256/(max- min)); // *(lpScr) = BYTE(0); if(*lpScr < r1){ *lpScr = BYTE(*lpScr/ k); } else if(*lpScr < r2){ *lpScr = BYTE((*lpScr - r1)*k + r1/k); } else { *lpScr = BYTE((*lpScr - r2)/k + 255 -(255 -r2)/k); } } } UpdateAllViews(NULL,0,NULL); }

void CBMPViewerDoc::OnMenuitem32780() //亮度增减 亮度增加20 { // TODO: Add your command handler code here int linewidth; linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4; // TODO: Add your command handler code here for(int i = 0 ; i< bi.biHeight ; i++){ for(int j = 0 ; j< bi.biWidth ; j++){ unsigned char *lpScr; lpScr = (unsigned char *)lpBuf+linewidth*(bi.biHeight - i -1) + j; if(*lpScr < 235){ *(lpScr) = BYTE(*lpScr +20); } else *lpScr = BYTE(255); } } // Invalidata(TRUE); UpdateAllViews(NULL,0,NULL); } void CBMPViewerDoc::OnMenuitem32781() //取对数 { // TODO: Add your command handler code here int linewidth; linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4; // TODO: Add your command handler code here for(int i = 0 ; i< bi.biHeight ; i++){ for(int j = 0 ; j< bi.biWidth ; j++){ unsigned char *lpScr; lpScr = (unsigned char *)lpBuf+linewidth*(bi.biHeight - i -1) + j; double c ; c = 255/log(255); *lpScr = BYTE(c*log(*lpScr +1)); } } // Invalidata(TRUE); UpdateAllViews(NULL,0,NULL); } void CBMPViewerDoc::OnMenuitem32782() //取指数 { // TODO: Add your command handler code here int linewidth; linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4; // TODO: Add your command handler code here for(int i = 0 ; i< bi.biHeight ; i++){ for(int j = 0 ; j< bi.biWidth ; j++){ unsigned char *lpScr; lpScr = (unsigned char *)lpBuf+linewidth*(bi.biHeight - i -1) + j; double c ; c = 255/pow(255 ,2); *lpScr = BYTE(c*pow(*lpScr , 2)); } } // Invalidata(TRUE); UpdateAllViews(NULL,0,NULL); }

void CBMPViewerDoc::OnMenuitem32785() //降低亮度 { // TODO: Add your command handler code here int linewidth; linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4; // TODO: Add your command handler code here for(int i = 0 ; i< bi.biHeight ; i++){ for(int j = 0 ; j< bi.biWidth ; j++){ unsigned char *lpScr; lpScr = (unsigned char *)lpBuf+linewidth*(bi.biHeight - i -1) + j; if(*lpScr > 20){ *(lpScr) = BYTE(*lpScr -20); } else *lpScr = BYTE(0); } } // Invalidata(TRUE); UpdateAllViews(NULL,0,NULL); }