二值图像跟踪曲线程序
稍后提交一个完整的测试程序
1
2BOOL WINAPI TraceDIB(LPSTR lpDIBBits,LONG lWidth,LONG lHeight,CArray<CPoint,CPoint>* pPoint,CArray<int,int>* pSlope)
3
{
4
// 指向源图像的指针
5BYTE*lpSrc;
6
7// 指向缓存图像的指针
8BYTE*lpDst;
9
10// 指向缓存DIB图像的指针
11BYTE*lpNewDIBBits;
12HLOCALhNewDIBBits;
13
14// 图像每行的字节数
15LONG lLineBytes=WIDTHBYTES(lWidth * 8);
16
17long i,j;
18DWORD ii=0;
19
20BYTE pixel;
21bool bFindStartPoint;
22
23//是否扫描到一个边界点
24bool bFindPoint;
25
26
27//起始边界点与当前边界点
28CPoint StartPoint,CurrentPoint;
29 //顺时针方向
30
int Direction[8][2]={{1,0},{1,-1},{0,-1},{-1,-1},{-1,0},{-1,1},{0,1},{1,1}};
31int BeginDirect;
32
33hNewDIBBits = LocalAlloc(LHND, lLineBytes * lHeight);
34if (hNewDIBBits == NULL)
35{
36// 分配内存失败
37return FALSE;
38
}
39lpNewDIBBits = (BYTE* )LocalLock(hNewDIBBits);
40// 初始化新分配的内存，设定初始值为255
41lpDst = (BYTE*)lpNewDIBBits;
42memset(lpDst, (BYTE)255, lLineBytes * lHeight);
43
44
45//先找到最左下方的边界点
46bFindStartPoint = false;
47for (j = 0;j < lHeight && !bFindStartPoint;j++)
48{
49for(i = 0;i < lWidth && !bFindStartPoint;i++)
50{
51// 指向源图像倒数第j行，第i个象素的指针
52lpSrc = (BYTE *)lpDIBBits + lLineBytes * j + i;
53
54pixel = (BYTE)*lpSrc;
55
56if(pixel == 0)
57{
58bFindStartPoint = true;
59
60StartPoint.y = j;
61StartPoint.x = i;
62
63// 指向目标图像倒数第j行，第i个象素的指针
64lpDst = (BYTE *)lpNewDIBBits + lLineBytes * j + i;
65*lpDst = (BYTE)0;
66}
67}
68}
69
70//由于起始点是在左下方，故起始扫描沿左上方向
71BeginDirect = 5;
72//跟踪边界
73bFindStartPoint = false;
74//从初始点开始扫描
75CurrentPoint.y = StartPoint.y;
76CurrentPoint.x = StartPoint.x;
77pPoint->Add(CurrentPoint);
78// 第一个点的斜率为2
79pSlope->Add(int(2));
80ii++;
81
82while(!bFindStartPoint)
83{
84bFindPoint = false;
85while(!bFindPoint)
86{
87//沿扫描方向查看一个像素
88long offset = lLineBytes * ( CurrentPoint.y + Direction[BeginDirect][1])
89+ (CurrentPoint.x + Direction[BeginDirect][0]);
90lpSrc = (unsigned char *)lpDIBBits + offset;
91lpDst = (unsigned char *)lpNewDIBBits + offset;
92pixel = (unsigned char)*lpSrc;
93
94if(pixel == 0&&(unsigned char)*lpDst==255)
95{
96bFindPoint = true;
97CurrentPoint.y = CurrentPoint.y + Direction[BeginDirect][1];
98CurrentPoint.x = CurrentPoint.x + Direction[BeginDirect][0];
99pPoint->Add(CurrentPoint);
100
101// s = BeginDirect%4;
102//if(s==3)
103//s = -1;
104 //左上方代表方向的5，以后按照
105pSlope->Add(BeginDirect);//s;
106ii++;
107*lpDst = (unsigned char)0;
108//扫描的方向逆时针旋转两格
109BeginDirect--;
110if(BeginDirect == -1)
111BeginDirect = 7;
112BeginDirect--;
113if(BeginDirect == -1)
114BeginDirect = 7;
115}
116else
117{
118if(pixel!=0)
119{
120//扫描方向顺时针旋转一格
121BeginDirect++;
122if(BeginDirect == 8)
123BeginDirect = 0;
124}
125else{
126// 扫描到以扫过的点
127bFindPoint = true;
128bFindStartPoint = true;
129}
130}
131
132}
133}
134
135ASSERT(pPoint->GetSize()==ii);
136
137// 复制腐蚀后的图像
138memcpy(lpDIBBits, lpNewDIBBits, lWidth * lHeight);
139
140// 释放内存
141LocalUnlock(hNewDIBBits);
142LocalFree(hNewDIBBits);
143
144// 返回
145return TRUE;
146
}
147
148
2
BOOL WINAPI TraceDIB(LPSTR lpDIBBits,LONG lWidth,LONG lHeight,CArray<CPoint,CPoint>* pPoint,CArray<int,int>* pSlope)
3
{
4
// 指向源图像的指针
5
BYTE*lpSrc;
6
7
// 指向缓存图像的指针
8
BYTE*lpDst;
9
10
// 指向缓存DIB图像的指针
11
BYTE*lpNewDIBBits;
12
HLOCALhNewDIBBits;
13
14
// 图像每行的字节数
15
LONG lLineBytes=WIDTHBYTES(lWidth * 8);
16
17
long i,j;
18
DWORD ii=0;
19
20
BYTE pixel;
21
bool bFindStartPoint;
22
23
//是否扫描到一个边界点
24
bool bFindPoint;
25
26
27
//起始边界点与当前边界点
28
CPoint StartPoint,CurrentPoint;
29
//顺时针方向
30
int Direction[8][2]={{1,0},{1,-1},{0,-1},{-1,-1},{-1,0},{-1,1},{0,1},{1,1}};
31
int BeginDirect;
32
33
hNewDIBBits = LocalAlloc(LHND, lLineBytes * lHeight);
34
if (hNewDIBBits == NULL)
35
{
36
// 分配内存失败
37
return FALSE;
38
}
39
lpNewDIBBits = (BYTE* )LocalLock(hNewDIBBits);
40
// 初始化新分配的内存，设定初始值为255
41
lpDst = (BYTE*)lpNewDIBBits;
42
memset(lpDst, (BYTE)255, lLineBytes * lHeight);
43
44
45
//先找到最左下方的边界点
46
bFindStartPoint = false;
47
for (j = 0;j < lHeight && !bFindStartPoint;j++)
48
{
49
for(i = 0;i < lWidth && !bFindStartPoint;i++)
50
{
51
// 指向源图像倒数第j行，第i个象素的指针
52
lpSrc = (BYTE *)lpDIBBits + lLineBytes * j + i;
53
54
pixel = (BYTE)*lpSrc;
55
56
if(pixel == 0)
57
{
58
bFindStartPoint = true;
59
60
StartPoint.y = j;
61
StartPoint.x = i;
62
63
// 指向目标图像倒数第j行，第i个象素的指针
64
lpDst = (BYTE *)lpNewDIBBits + lLineBytes * j + i;
65
*lpDst = (BYTE)0;
66
}
67
}
68
}
69
70
//由于起始点是在左下方，故起始扫描沿左上方向
71
BeginDirect = 5;
72
//跟踪边界
73
bFindStartPoint = false;
74
//从初始点开始扫描
75
CurrentPoint.y = StartPoint.y;
76
CurrentPoint.x = StartPoint.x;
77
pPoint->Add(CurrentPoint);
78
// 第一个点的斜率为2
79
pSlope->Add(int(2));
80
ii++;
81
82
while(!bFindStartPoint)
83
{
84
bFindPoint = false;
85
while(!bFindPoint)
86
{
87
//沿扫描方向查看一个像素
88
long offset = lLineBytes * ( CurrentPoint.y + Direction[BeginDirect][1])
89
+ (CurrentPoint.x + Direction[BeginDirect][0]);
90
lpSrc = (unsigned char *)lpDIBBits + offset;
91
lpDst = (unsigned char *)lpNewDIBBits + offset;
92
pixel = (unsigned char)*lpSrc;
93
94
if(pixel == 0&&(unsigned char)*lpDst==255)
95
{
96
bFindPoint = true;
97
CurrentPoint.y = CurrentPoint.y + Direction[BeginDirect][1];
98
CurrentPoint.x = CurrentPoint.x + Direction[BeginDirect][0];
99
pPoint->Add(CurrentPoint);
100
101
// s = BeginDirect%4;
102
//if(s==3)
103
//s = -1;
104
//左上方代表方向的5，以后按照
105
pSlope->Add(BeginDirect);//s;
106
ii++;
107
*lpDst = (unsigned char)0;
108
//扫描的方向逆时针旋转两格
109
BeginDirect--;
110
if(BeginDirect == -1)
111
BeginDirect = 7;
112
BeginDirect--;
113
if(BeginDirect == -1)
114
BeginDirect = 7;
115
}
116
else
117
{
118
if(pixel!=0)
119
{
120
//扫描方向顺时针旋转一格
121
BeginDirect++;
122
if(BeginDirect == 8)
123
BeginDirect = 0;
124
}
125
else{
126
// 扫描到以扫过的点
127
bFindPoint = true;
128
bFindStartPoint = true;
129
}
130
}
131
132
}
133
}
134
135
ASSERT(pPoint->GetSize()==ii);
136
137
// 复制腐蚀后的图像
138
memcpy(lpDIBBits, lpNewDIBBits, lWidth * lHeight);
139
140
// 释放内存
141
LocalUnlock(hNewDIBBits);
142
LocalFree(hNewDIBBits);
143
144
// 返回
145
return TRUE;
146
}
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