HOUGH变换的VC代码.docx

1、HOUGH变换的VC代码HOUGH变换的VC代码 BOOL WINAPI HoughDIB(LPSTR lpDIBBits, LONG lWidth, LONG lHeight) / 指向源图像的指针 LPSTR lpSrc; / 指向缓存图像的指针 LPSTR lpDst; / 指向变换域的指针 LPSTR lpTrans; / 图像每行的字节数 LONG lLineBytes; / 指向缓存DIB图像的指针 LPSTR lpNewDIBBits; HLOCAL hNewDIBBits; /指向变换域的指针 LPSTR lpTransArea; HLOCAL hTransArea; /变换域

2、的尺寸 int iMaxDist; int iMaxAngleNumber; /变换域的坐标 int iDist; int iAngleNumber; /循环变量 long i; long j; /像素值 unsigned char pixel; /存储变换域中的两个最大值 MaxValue MaxValue1; MaxValue MaxValue2; / 暂时分配内存，以保存新图像 hNewDIBBits = LocalAlloc(LHND, lWidth * lHeight); if (hNewDIBBits = NULL) / 分配内存失败 return FALSE; / 锁定内存 lp

3、NewDIBBits = (char * )LocalLock(hNewDIBBits); / 初始化新分配的内存，设定初始值为255 lpDst = (char *)lpNewDIBBits; memset(lpDst, (BYTE)255, lWidth * lHeight); /计算变换域的尺寸 /最大距离 iMaxDist = (int) sqrt(lWidth*lWidth + lHeight*lHeight); /角度从0180，每格2度 iMaxAngleNumber = 90; /为变换域分配内存 hTransArea = LocalAlloc(LHND, lWidth * l

4、Height * sizeof(int); if (hNewDIBBits = NULL) / 分配内存失败 return FALSE; / 锁定内存 lpTransArea = (char * )LocalLock(hTransArea); / 初始化新分配的内存，设定初始值为0 lpTrans = (char *)lpTransArea; memset(lpTrans, 0, lWidth * lHeight * sizeof(int); / 计算图像每行的字节数 lLineBytes = WIDTHBYTES(lWidth * 8); for(j = 0; j lHeight; j+)

5、for(i = 0;i lWidth; i+) / 指向源图像倒数第j行，第i个象素的指针 lpSrc = (char *)lpDIBBits + lLineBytes * j + i; /取得当前指针处的像素值，注意要转换为unsigned char型 pixel = (unsigned char)*lpSrc; /目标图像中含有0和255外的其它灰度值 if(pixel != 255 & *lpSrc != 0) return FALSE; /如果是黑点，则在变换域的对应各点上加1 if(pixel = 0) /注意步长是2度 for(iAngleNumber=0; iAngleNumbe

6、riMaxAngleNumber; iAngleNumber+) iDist = (int) fabs(i*cos(iAngleNumber*2*pi/180.0) + j*sin(iAngleNumber*2*pi/180.0); /变换域的对应点上加1 *(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber) = *(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber) +1; /找到变换域中的两个最大值点 MaxValue1.Value=0; MaxValue2.Value=0; /找到第一个最大值点 f

7、or (iDist=0; iDistMaxValue1.Value) MaxValue1.Value = (int)*(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber); MaxValue1.Dist = iDist; MaxValue1.AngleNumber = iAngleNumber; /将第一个最大值点附近清零 for (iDist = -9;iDist =0 & iDist+MaxValue1.Dist=0 & iAngleNumber+MaxValue1.AngleNumber=iMaxAngleNumber) *(lpTransAr

8、ea+(iDist+MaxValue1.Dist)*iMaxAngleNumber+ (iAngleNumber+MaxValue1.AngleNumber)=0; /找到第二个最大值点 for (iDist=0; iDistMaxValue2.Value) MaxValue2.Value = (int)*(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber); MaxValue2.Dist = iDist; MaxValue2.AngleNumber = iAngleNumber; /判断两直线是否平行 if(abs(MaxValue1.AngleN

9、umber-MaxValue2.AngleNumber)=2) /两直线平行，在缓存图像中重绘这两条直线 for(j = 0; j lHeight; j+) for(i = 0;i lWidth; i+) / 指向缓存图像倒数第j行，第i个象素的指针 lpDst = (char *)lpNewDIBBits + lLineBytes * j + i; /如果该点在某一条平行直线上，则在缓存图像上将该点赋为黑 /在第一条直线上 iDist = (int) fabs(i*cos(MaxValue1.AngleNumber*2*pi/180.0) + j*sin(MaxValue1.AngleNum

10、ber*2*pi/180.0); if (iDist = MaxValue1.Dist) *lpDst = (unsigned char)0; /在第二条直线上 iDist = (int) fabs(i*cos(MaxValue2.AngleNumber*2*pi/180.0) + j*sin(MaxValue2.AngleNumber*2*pi/180.0); if (iDist = MaxValue2.Dist) *lpDst = (unsigned char)0; / 复制腐蚀后的图像 memcpy(lpDIBBits, lpNewDIBBits, lWidth * lHeight); / 释放内存 LocalUnlock(hNewDIBBits); LocalFree(hNewDIBBits); / 释放内存 LocalUnlock(hTransArea); LocalFree(hTransArea); / 返回 return TRUE;