我正在尝试使用 AForge.NET 来检测图像中的粗白线。
这就像我得到的管道一样,是应用阈值过滤器后我想要的结果。
我知道如何检测形状并且我已经在这样做了,但是这在任何形状下都不匹配,因为它没有边缘而且不是圆形。
我有检测等边形状的示例代码,但我不知道这是否相关。
public void DetectQuadrilateralType(Bitmap bitmap)
{
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(bitmap);
Blob[] blobs = blobCounter.GetObjectsInformation();
//Graphics object to draw
Pen pen;
Graphics g = Graphics.FromImage(bitmap);
SimpleShapeChecker shapeChecker = new SimpleShapeChecker();
for (int i = 0; i < blobs.Length; i++)
{
List<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blobs[i]);
List<IntPoint> corners;
if (i < edgePoints.ToArray().Length && i > -1)
{
try
{
if (shapeChecker.IsConvexPolygon(edgePoints, out corners))
{
PolygonSubType subType = shapeChecker.CheckPolygonSubType(corners);
pen = new Pen(colors[subType], 2);
g.DrawPolygon(pen, ToPointsArray(corners));
pen.Dispose();
}
}
catch (Exception e) { }
}
}
g.Dispose();
}
这是我要检测的图像:
如果有人知道我如何使用 AForge 或以其他方式使用 C#/.NET 检测该白色 Blob ,我将非常感激。
上面的代码只检测边缘,所以它只会检测有锐边的形状,这种情况很少见。
编辑
我有点让它用下面的方法工作
public void DetectBigBlobs(Bitmap bitmap)
{
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(bitmap);
Rectangle[] rects = blobCounter.GetObjectsRectangles();
//Graphics object to draw
Pen pen = new Pen(Color.Red, 2);
Graphics g = Graphics.FromImage(bitmap);
foreach (Rectangle rect in rects)
{
if (rect.Width > 200 && rect.Height > 150)
{
g.DrawRectangle(pen, rect);
}
}
pen.Dispose();
g.Dispose();
}
肯定有比使用固定宽度更好的方法(因为它们可能变化很大)
最佳答案
如果你想得到一个标记的blob,你可以使用这个代码
public void DetectBigBlobs(Bitmap bitmap)
{
BlobCounter blobCounter = new BlobCounter();
Graphics g = Graphics.FromImage(bitmap);
//filtering the blobs before searching for blobs
blobCounter.FilterBlobs = true;
blobCounter.MinHeight = bitmap.Height/3;
blobCounter.MinWidth = bitmap.Width/3;
blobCounter.ProcessImage(bitmap);
Blob[] blobs = blobCounter.GetObjectsInformation();
foreach (Blob b in blobs)
{
//getting the found blob edgepoints
List<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(b);
//if you want to mark every edge point RED
foreach (IntPoint point in edgePoints)
bitmap.SetPixel(point.X, point.Y, Color.Red);
//if you want to draw a rectangle around the blob
g.DrawRectangle(Pens.Blue,b.Rectangle);
}
g.Dispose();
}
问我是否想要不同的东西,我会尽我所能提供帮助:)
关于c# - 白色 Blob 检测,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9794196/