//**************************************************************************
//Thinner.cpp
//细化算法实现文件
//**************************************************************************
#include "StdAfx.h"
#include <stdlib.h>
#include <malloc.h>
#include "Thinner.h"
void beforethin(unsigned char *ip, unsigned char *jp,
unsigned long lx, unsigned long ly)
{
unsigned long i,j;
for(i=0; i<ly; i++)
{
for(j=0; j<lx; j++)
{
//这里要视前景是白点还是黑点而定，可以改动
//如果前景是白点，就是这样；反之反过来
if(ip[i*lx+j]>0)
jp[i*lx+j]=1;
else
jp[i*lx+j]=0;
}
}
}
/////////////////////////////////////////////////////////////////////////
//Hilditch细化算法
//功能：对图象进行细化
//参数：image：代表图象的一维数组
// lx：图象宽度
// ly：图象高度
// 无返回值
void ThinnerHilditch(void *image, unsigned long lx, unsigned long ly)
{
char *f, *g;
char n[10];
unsigned int counter;
short k, shori, xx, nrn;
unsigned long i, j;
long kk, kk11, kk12, kk13, kk21, kk22, kk23, kk31, kk32, kk33, size;
size = (long)lx * (long)ly;
g = (char *)malloc(size);
if(g == NULL)
{
printf("error in allocating memory!\n");
return;
}
f = (char *)image;
for(i=0; i<lx; i++)
{
for(j=0; j<ly; j++)
{
kk=i*ly+j;
if(f[kk]!=0)
{
f[kk]=1;
g[kk]=f[kk];
}
}
}
counter = 1;
do
{
printf("%4d*",counter);
counter++;
shori = 0;
for(i=0; i<lx; i++)
{
for(j=0; j<ly; j++)
{
kk = i*ly+j;
if(f[kk]<0)
f[kk] = 0;
g[kk]= f[kk];
}
}
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk=i*ly+j;
if(f[kk]!=1)
continue;
kk11 = (i-1)*ly+j-1;
kk12 = kk11 + 1;
kk13 = kk12 + 1;
kk21 = i*ly+j-1;
kk22 = kk21 + 1;
kk23 = kk22 + 1;
kk31 = (i+1)*ly+j-1;
kk32 = kk31 + 1;
kk33 = kk32 + 1;
if((g[kk12]&&g[kk21]&&g[kk23]&&g[kk32])!=0)
continue;
nrn = g[kk11] + g[kk12] + g[kk13] + g[kk21] + g[kk23] +
g[kk31] + g[kk32] + g[kk33];
if(nrn <= 1)
{
f[kk22] = 2;
continue;
}
n[4] = f[kk11];
n[3] = f[kk12];
n[2] = f[kk13];
n[5] = f[kk21];
n[1] = f[kk23];
n[6] = f[kk31];
n[7] = f[kk32];
n[8] = f[kk33];
n[9] = n[1];
xx = 0;
for(k=1; k<8; k=k+2)
{
if((!n[k])&&(n[k+1]||n[k+2]))
xx++;
}
if(xx!=1)
{
f[kk22] = 2;
continue;
}
if(f[kk12] == -1)
{
f[kk12] = 0;
n[3] = 0;
xx = 0;
for(k=1; k<8; k=k+2)
{
if((!n[k])&&(n[k+1]||n[k+2]))
xx++;
}
if(xx != 1)
{
f[kk12] = -1;
continue;
}
f[kk12] = -1;
n[3] = -1;
}
if(f[kk21]!=-1)
{
f[kk22] = -1;
shori = 1;
continue;
}
f[kk21] = 0;
n[5] = 0;
xx = 0;
for(k=1; k<8; k=k+2)
{
if((!n[k])&&(n[k+1]||n[k+2]))
{
xx++;
}
}
if(xx == 1)
{
f[kk21] = -1;
f[kk22] = -1;
shori =1;
}
else
f[kk21] = -1;
}
}
}while(shori);
free(g);
}
/////////////////////////////////////////////////////////////////////////
//Pavlidis细化算法
//功能：对图象进行细化
//参数：image：代表图象的一维数组
// lx：图象宽度
// ly：图象高度
// 无返回值
void ThinnerPavlidis(void *image, unsigned long lx, unsigned long ly)
{
char erase, n[8];
char *f;
unsigned char bdr1,bdr2,bdr4,bdr5;
short c,k,b;
unsigned long i,j;
long kk,kk1,kk2,kk3;
f = (char*)image;
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk = i*ly + j;
if(f[kk])
f[kk] = 1;
}
}
for(i=0, kk1=0, kk2=ly-1; i<lx; i++, kk1+=ly, kk2+=ly)
{
f[kk1]=0;
f[kk2]=0;
}
for(j=0, kk=(lx-1)*ly; j<ly; j++,kk++)
{
f[j]=0;
f[kk]=0;
}
c=5;
erase =1;
while(erase)
{
c++;
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk=i*ly+j;
if(f[kk]!=1)
continue;
kk1 = kk-ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[3] = f[kk1];
n[2] = f[kk2];
n[1] = f[kk3];
kk1 = kk - 1;
kk3 = kk + 1;
n[4] = f[kk1];
n[0] = f[kk3];
kk1 = kk + ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[5] = f[kk1];
n[6] = f[kk2];
n[7] = f[kk3];
bdr1 =0;
for(k=0; k<8; k++)
{
if(n[k]>=1)
bdr1|=0x80>>k;
}
if((bdr1&0252)== 0252)
continue;
f[kk] = 2;
b=0;
for(k=0; k<=7; k++)
{
b+=bdr1&(0x80>>k);
}
if(b<=1)
f[kk]=3;
if((bdr1&0160)!=0&&(bdr1&07)!=0&&(bdr1&0210)==0)
f[kk]=3;
else if((bdr1&&0301)!=0&&(bdr1&034)!=0&&(bdr1&042)==0)
f[kk]=3;
else if((bdr1&0202)==0 && (bdr1&01)!=0)
f[kk]=3;
else if((bdr1&0240)==0 && (bdr1&0100)!=0)
f[kk]=3;
else if((bdr1&050)==0 && (bdr1&020)!=0)
f[kk]=3;
else if((bdr1&012)==0 && (bdr1&04)!=0)
f[kk]=3;
}
}
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk = i*ly + j;
if(!f[kk])
continue;
kk1 = kk - ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[3] = f[kk1];
n[2] = f[kk2];
n[1] = f[kk3];
kk1 = kk - 1;
kk2 = kk + 1;
n[4] = f[kk1];
n[0] = f[kk3];
kk1 = kk + ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[5] = f[kk1];
n[6] = f[kk2];
n[7] = f[kk3];
bdr1 = bdr2 =0;
for(k=0; k<=7; k++)
{
if(n[k]>=1)
bdr1|=0x80>>k;
if(n[k]>=2)
bdr2|=0x80>>k;
}
if(bdr1==bdr2)
{
f[kk] = 4;
continue;
}
if(f[kk]!=2)
continue;
if((bdr2&0200)!=0 && (bdr1&010)==0 &&
((bdr1&0100)!=0 &&(bdr1&001)!=0 ||
((bdr1&0100)!=0 ||(bdr1 & 001)!=0) &&
(bdr1&060)!=0 &&(bdr1&06)!=0))
{
f[kk] = 4;
}
else if((bdr2&040)!=0 && (bdr1&02)==0 &&
((bdr1&020)!=0 && (bdr1&0100)!=0 ||
((bdr1&020)!=0 || (bdr1&0100)!=0) &&
(bdr1&014)!=0 && (bdr1&0201)!=0))
{
f[kk] = 4;
}
else if((bdr2&010)!=0 && (bdr1&0200)==0 &&
((bdr1&04)!=0 && (bdr1&020)!=0 ||
((bdr1&04)!=0 || (bdr1&020)!=0) &&
(bdr1&03)!=0 && (bdr1&0140)!=0))
{
f[kk] = 4;
}
else if((bdr2&02)!=0 && (bdr1&040)==0 &&
((bdr1&01)!=0 && (bdr1&04)!=0 ||
((bdr1&01)!=0 || (bdr1&04)!=0) &&
(bdr1&0300)!=0 && (bdr1&030)!=0))
{
f[kk] = 4;
}
}
}
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk = i*ly + j;
if(f[kk]!=2)
continue;
kk1 = kk - ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[3] = f[kk1];
n[2] = f[kk2];
n[1] = f[kk3];
kk1 = kk - 1;
kk2 = kk + 1;
n[4] = f[kk1];
n[0] = f[kk3];
kk1 = kk + ly -1;
kk2 = kk1 + 1;
kk3 = kk2 + 1;
n[5] = f[kk1];
n[6] = f[kk2];
n[7] = f[kk3];
bdr4 = bdr5 =0;
for(k=0; k<=7; k++)
{
if(n[k]>=4)
bdr4|=0x80>>k;
if(n[k]>=5)
bdr5|=0x80>>k;
}
if((bdr4&010) == 0)
{
f[kk] = 5;
continue;
}
if((bdr4&040) == 0 && bdr5 ==0)
{
f[kk] = 5;
continue;
}
if(f[kk]==3||f[kk]==4)
f[kk] = c;
}
}
erase = 0;
for(i=1; i<lx-1; i++)
{
for(j=1; j<ly-1; j++)
{
kk = i*ly +j;
if(f[kk]==2||f[kk] == 5)
{
erase = 1;
f[kk] = 0;
}
}
}
}
}
/////////////////////////////////////////////////////////////////////////
//Rosenfeld细化算法
//功能：对图象进行细化
//参数：image：代表图象的一维数组
// lx：图象宽度
// ly：图象高度
// 无返回值
void ThinnerRosenfeld(void *image, unsigned long lx, unsigned long ly)
{
char *f, *g;
char n[10];
char a[5] = {0, -1, 1, 0, 0};
char b[5] = {0, 0, 0, 1, -1};
char nrnd, cond, n48
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