使用C＃进行区域增长图像分割 [英] Region Growing Image Segmentation with C#
本文介绍了使用C＃进行区域增长图像分割的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我不知道这个代码有什么问题，我希望你能解释一下或者让它变得更好......因为我不知道这个代码还有什么...请帮助..
i dont know what is wrong with this code, i hope you can explain it to me or make it better.. because I dont know What else to do with this code.. please help..
public Bitmap Bitmap{
get{
return bitmap;
}
set{
Bitmap bitmap = new Bitmap (CitraAsli.Image);
mask = new bool[bitmap.Height, bitmap.Width];
maskBitmap = new Bitmap(bitmap.Width, bitmap.Height, PixelFormat.Format32bppArgb);
for (int i = 0; i < bitmap.Height; i++)
for (int j = 0; j < bitmap.Width; j++)
mask[i, j] = false;
BitmapData data = bitmap.LockBits(new Rectangle(0, 0,bitmap.Width, bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
pixels = new Color[bitmap.Height, bitmap.Width];
for (int i = 0; i < bitmap.Height; i++)
{
unsafe
{
int* pix = (int*)((int)data.Scan0 + data.Stride * i);
for (int j = 0; j < bitmap.Width; j++)
{
pixels[i, j] = Color.FromArgb(pix[j]);
}
}
}
bitmap.UnlockBits(data);
}
}
int GetColorDistance(Color c1, Color c2){
return Math.Max(Math.Max(Math.Abs(c1.R - c2.R), Math.Abs(c1.G - c2.G)), Math.Abs(c1.B - c2.B));
}
private delegate void IncludeToRegion(int x, int y);
void PushMask()
{
maskStack.Add(mask);
bool[,] orimask = mask;
mask = new bool[bitmap.Height, bitmap.Width];
for (int i = 0; i < bitmap.Height; i++)
{
for (int j = 0; j < bitmap.Width; j++)
{
mask[i, j] = orimask[i, j];
}
}
if (maskStack.Count > MaxUndoCount)
{
maskStack.RemoveAt(0);
}
}
private void UpdateMaskBitmap(){
BitmapData data = maskBitmap.LockBits(new Rectangle(0, 0, maskBitmap.Width, maskBitmap.Height),
ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
for (int i = 0; i < maskBitmap.Height; i++){
unsafe
{
int* pix = (int*)((int)data.Scan0 + data.Stride * i);
for (int j = 0; j < maskBitmap.Width; j++){
pix[j] = Color.FromArgb(mask[i, j] ? 128 : 0,Color.Blue).ToArgb();
}
}
}
maskBitmap.UnlockBits(data);
}
void GrowRegion(){
PushMask();
int y = startPoint.Y;
int x = startPoint.X;
int threshold = 10;
mask[y, x] = true;
bool[,] scanned = new bool[bitmap.Height, bitmap.Width];
for (int i = 0; i < bitmap.Height; i++)
for (int j = 0; j < bitmap.Width; j++)
scanned[i, j] = false;
scanned[y, x] = true;
Queue<Point> queue = new Queue<Point>();
Point curPoint = startPoint;
//double stdev = 0.0;
//double sn = 0.0;
double meanR = pixels[y,x].R;
double meanG = pixels[y,x].G;
double meanB = pixels[y,x].B;
int n = 1;
IncludeToRegion include = delegate(int X, int Y)
{
double diff = Math.Max(Math.Abs(pixels[Y, X].R - meanR) / meanR, Math.Max(Math.Abs(pixels[Y, X].B - meanB) / meanB, Math.Abs(pixels[Y, X].G - meanG) / meanG));
if (diff < threshold)
{
mask[Y, X] = true;
queue.Enqueue(new Point(X, Y));
meanR = (meanR * n + pixels[Y, X].R) / (n + 1);
meanG = (meanG * n + pixels[Y, X].G) / (n + 1);
meanB = (meanB * n + pixels[Y, X].B) / (n + 1);
//sn = sn + (val ‐ mean)*(val‐newMean);
//stdev = Math.Sqrt(sn/(n));
n++;
}
while (true)
{
Point p1, p2, p3, p4;
p1 = new Point(curPoint.X - 1, curPoint.Y);
p2 = new Point(curPoint.X + 1, curPoint.Y);
p3 = new Point(curPoint.X, curPoint.Y - 1);
p4 = new Point(curPoint.X, curPoint.Y + 1);
if (p1.X >= 0 && !scanned[p1.Y, p1.X])
{
scanned[p1.Y, p1.X] = true;
include(p1.X, p1.Y);
}
if (p2.X < bitmap.Width && !scanned[p2.Y, p2.X])
{
scanned[p2.Y, p2.X] = true;
include(p2.X, p2.Y);
}
if (p3.Y >= 0 && !scanned[p3.Y, p3.X])
{
scanned[p3.Y, p3.X] = true;
include(p3.X, p3.Y);
}
if (p4.Y < bitmap.Height && !scanned[p4.Y, p4.X])
{
scanned[p4.Y, p4.X] = true;
include(p4.X, p4.Y);
}
if (queue.Count() != 0)
curPoint = queue.Dequeue();
else
break;
UpdateMaskBitmap();
}
};
}
推荐答案
您能否在此写下您需要达到的目标？
查看代码，我发现从不使用Bitmap属性setter。该初始化代码应该放在getter中。
Could you please write here what you need to achieve?
Looking at your code, I see that Bitmap property setter is never used. The initalization code is supposed to be placed in the getter instead.
public Bitmap Bitmap
{
get
{
Bitmap bitmap = new Bitmap(CitraAsli.Image);
mask = new bool[bitmap.Height, bitmap.Width];
maskBitmap = new Bitmap(bitmap.Width, bitmap.Height, PixelFormat.Format32bppArgb);
for (int i = 0; i < bitmap.Height; i++)
for (int j = 0; j < bitmap.Width; j++)
mask[i, j] = false;
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
pixels = new Color[bitmap.Height, bitmap.Width];
for (int i = 0; i < bitmap.Height; i++)
{
unsafe
{
int* pix = (int*)((int)data.Scan0 + data.Stride * i);
for (int j = 0; j < bitmap.Width; j++)
{
pixels[i, j] = Color.FromArgb(pix[j]);
}
}
}
bitmap.UnlockBits(data);
return bitmap;
}
}
GrowRegion（）功能没完成。你想在这个函数中做什么？
GrowRegion() function is not completed. What you want to do in this function?
void GrowRegion()
{
PushMask();
int y = startPoint.Y;
int x = startPoint.X;
int threshold = 10;
mask[y, x] = true;
bool[,] scanned = new bool[bitmap.Height, bitmap.Width];
for (int i = 0; i < bitmap.Height; i++)
for (int j = 0; j < bitmap.Width; j++)
scanned[i, j] = false;
scanned[y, x] = true;
Queue<point> queue = new Queue<point>();
Point curPoint = startPoint;
//double stdev = 0.0;
//double sn = 0.0;
double meanR = pixels[y, x].R;
double meanG = pixels[y, x].G;
double meanB = pixels[y, x].B;
int n = 1;
IncludeToRegion include = null;
// .... what's next? what you want to achieve? where is the code?
}</point></point>
提供有关您的目标的更多详细信息，我可能会帮助您。
在缩放图像时，您必须记住两件重要的事情：
宽高比
Antialiasing
以下讨论应该帮助您了解图像调整大小的技巧：
http://stackoverflow.com/questions/10442269/scaling-a-system-drawing-bitmap-to-a-given-size-while-保持纵横比 [ ^ ]
http://stackoverflow.com/questions/333589/image-resizing-in-net-with-antialiasing [ ^ ]
希望这有帮助。
provide more details about your goal and I might help you.
There are two important things, that you have to keep in mind when scaling images:
Aspect ratio
Antialiasing
Following discussions should help you to understand images resizing techniques:
http://stackoverflow.com/questions/10442269/scaling-a-system-drawing-bitmap-to-a-given-size-while-maintaining-aspect-ratio[^]
http://stackoverflow.com/questions/333589/image-resizing-in-net-with-antialiasing[^]
Hope this helps.
这篇关于使用C＃进行区域增长图像分割的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
