📄 edgecontour.cpp
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* HoughDIB()
*
* 参数:
* LPSTR lpDIBBits - 指向源DIB图像指针
* LONG lWidth - 源图像宽度(象素数,必须是4的倍数)
* LONG lHeight - 源图像高度(象素数)
* 返回值:
* BOOL - 运算成功返回TRUE,否则返回FALSE。
*
* 说明:
* 该函数用于对检测图像中的平行直线。如果图像中有两条平行的直线,则将这两条平行直线
* 提取出来。
*
* 要求目标图像为只有0和255两个灰度值的灰度图像。
************************************************************************/
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
lpNewDIBBits = (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0-180,每格2度
iMaxAngleNumber = 90;
//为变换域分配内存
hTransArea = LocalAlloc(LHND, lWidth * lHeight * 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++)
{
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; iAngleNumber<iMaxAngleNumber; 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
for (iDist=0; iDist<iMaxDist;iDist++)
{
for(iAngleNumber=0; iAngleNumber<iMaxAngleNumber; iAngleNumber++)
{
if((int)*(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber)>MaxValue1.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 < 10;iDist++)
{
for(iAngleNumber=-1; iAngleNumber<2; iAngleNumber++)
{
if(iDist+MaxValue1.Dist>=0 && iDist+MaxValue1.Dist<iMaxDist \
&& iAngleNumber+MaxValue1.AngleNumber>=0 && iAngleNumber+MaxValue1.AngleNumber<=iMaxAngleNumber)
{
*(lpTransArea+(iDist+MaxValue1.Dist)*iMaxAngleNumber+\
(iAngleNumber+MaxValue1.AngleNumber))=0;
}
}
}
//找到第二个最大值点
for (iDist=0; iDist<iMaxDist;iDist++)
{
for(iAngleNumber=0; iAngleNumber<iMaxAngleNumber; iAngleNumber++)
{
if((int)*(lpTransArea+iDist*iMaxAngleNumber+iAngleNumber)>MaxValue2.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.AngleNumber-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.AngleNumber*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;
}
/*************************************************************************
*
* 函数名称:
* Fill2DIB()
*
* 参数:
* LPSTR lpDIBBits - 指向源DIB图像指针
* LONG lWidth - 源图像宽度(象素数,必须是4的倍数)
* LONG lHeight - 源图像高度(象素数)
* 返回值:
* BOOL - 种子填充成功返回TRUE,否则返回FALSE。
*
* 说明:
* 该函数用于对图像进行种子填充运算。
*
* 要求目标图像为只有0和255两个灰度值的灰度图像。
************************************************************************/
BOOL WINAPI Fill2DIB(LPSTR lpDIBBits, LONG lWidth, LONG lHeight)
{
// 指向源图像的指针
LPSTR lpSrc;
//循环变量
long i;
//像素值
unsigned char pixel;
//左右边界像素位置
int xl,xr;
//是否已填充至边界
BOOL bFilll,bFillr;
//种子堆栈及指针
Seed Seeds[10];
int StackPoint;
//当前像素位置
int iCurrentPixelx,iCurrentPixely;
int iBufferPixelx,iBufferPixely;
//初始化种子
Seeds[1].Height = lHeight / 2;
Seeds[1].Width = lWidth / 2;
StackPoint = 1;
while( StackPoint != 0)
{
//取出种子
iCurrentPixelx = Seeds[StackPoint].Width;
iCurrentPixely = Seeds[StackPoint].Height;
StackPoint--;
// if(Seed2.Height== 75)
// {
// return true;
// i++;
// }
bFilll = true;
bFillr = true;
//填充种子所在的行
//保存种子像素的位置
iBufferPixelx = iCurrentPixelx;
iBufferPixely = iCurrentPixely;
//先向左填充
while(bFilll)
{
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + iCurrentPixelx;
//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 && pixel != 0)
return FALSE;
//遇到边界
if(pixel == 0)
{
bFilll = false;
xl=iCurrentPixelx+1;
}
else
{
*lpSrc = (unsigned char)0;
iCurrentPixelx--;
//防止越界
if(iCurrentPixelx<0)
{
bFilll = false;
iCurrentPixelx = 0;
xl = 0;
}
}
}
//再向右填充
//取回种子像素的位置
iCurrentPixelx = iBufferPixelx+1;
if(iCurrentPixelx>lWidth)
{
bFillr = false;
iCurrentPixelx = lWidth;
xr = lWidth;
}
iCurrentPixely = iBufferPixely;
while(bFillr)
{
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + iCurrentPixelx;
//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 && pixel != 0)
return FALSE;
//遇到边界
if(pixel == 0)
{
bFillr = false;
xr=iCurrentPixelx-1;
}
else
{
*lpSrc = (unsigned char)0;
iCurrentPixelx++;
//防止越界
if(iCurrentPixelx>lWidth)
{
bFillr = false;
iCurrentPixelx = lWidth;
xr = lWidth;
}
}
}
//上、下两条扫描线是否全为边界象素或已填充过
//先看上面的扫描线
iCurrentPixely--;
if(iCurrentPixely < 0)
{
iCurrentPixely = 0;
}
for (i = xr; i>= xl;i--)
{
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + 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;
//有未填充的像素,将新的种子压入堆栈
if (pixel == 255)
{
StackPoint++;
Seeds[StackPoint].Height = iCurrentPixely;
Seeds[StackPoint].Width = i;
break;
}
}
//再看下面的扫描线
iCurrentPixely+=2;
if(iCurrentPixely > lHeight)
{
iCurrentPixely = lHeight;
}
for (i = xr; i>= xl;i--)
{
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + 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;
//有未填充的像素,将新的种子压入堆栈
if (pixel == 255)
{
StackPoint++;
Seeds[StackPoint].Height = iCurrentPixely;
Seeds[StackPoint].Width = i;
break;
}
}
}
// 返回
return TRUE;
}
/*************************************************************************
*
* 函数名称:
* FillDIB()
*
* 参数:
* LPSTR lpDIBBits - 指向源DIB图像指针
* LONG lWidth - 源图像宽度(象素数,必须是4的倍数)
* LONG lHeight - 源图像高度(象素数)
* 返回值:
* BOOL - 种子填充成功返回TRUE,否则返回FALSE。
*
* 说明:
* 该函数用于对图像进行种子填充运算。
*
* 要求目标图像为只有0和255两个灰度值的灰度图像。
************************************************************************/
BOOL WINAPI FillDIB(LPSTR lpDIBBits, LONG lWidth, LONG lHeight)
{
// 指向源图像的指针
LPSTR lpSrc;
//像素值
unsigned char pixel;
//种子堆栈及指针
Seed *Seeds;
int StackPoint;
//当前像素位置
int iCurrentPixelx,iCurrentPixely;
//初始化种子
Seeds = new Seed[lWidth*lHeight];
Seeds[1].Height = lHeight / 2;
Seeds[1].Width = lWidth / 2;
StackPoint = 1;
while( StackPoint != 0)
{
//取出种子
iCurrentPixelx = Seeds[StackPoint].Width;
iCurrentPixely = Seeds[StackPoint].Height;
StackPoint--;
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + iCurrentPixelx;
//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 && pixel != 0)
return FALSE;
//将当前点涂黑
*lpSrc = (unsigned char)0;
//判断左面的点,如果为白,则压入堆栈
//注意防止越界
if(iCurrentPixelx > 0)
{
lpSrc = (char *)lpDIBBits + lWidth * iCurrentPixely + iCurrentPixelx - 1;
//取得当前指针处的像素值,注意要转换为unsigned char型
pixel = (unsigned char)*lpSrc;
if (pixel == 255)
{
StackPoint++;
Seeds[StackPoint].Height = iCurrentPixely;
Seeds[StackPoint].Width = iCurrentPixelx - 1;
}
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