我正在尝试使用AForge.NET在C#windows form Project中创建对象检测。
我写了这段代码:
public void DetectCorners()
{
// Load image and create everything you need for drawing
Bitmap image = new Bitmap(@"C:\Users\ssammour\Desktop\Unbenannt.PNG");
originalPicture.ImageLocation = @"C:\Users\ssammour\Desktop\Unbenannt.PNG";
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(image);
Graphics g = this.CreateGraphics();
Blob[] blobs = blobCounter.GetObjectsInformation();
SimpleShapeChecker shapeChecker = new SimpleShapeChecker();
Pen redPen = new Pen(Color.Red);
for (int i = 0, n = blobs.Length; i < n; i++)
{
List<IntPoint> corners;
List<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blobs[i]);
if (shapeChecker.IsQuadrilateral(edgePoints, out corners))
{
g.DrawPolygon(redPen, ToPointsArray(corners));
image = new Bitmap(image.Width, image.Height, g);
}
}
// Display
newPicture.Image = image;
}
private System.Drawing.Point[] ToPointsArray(List<IntPoint> points)
{
System.Drawing.Point[] array = new System.Drawing.Point[points.Count];
return array;
}
结果总是黑色照片,我不知道为什么。 我用这张照片来试试代码:
但仍会收到一张黑色照片。 任何帮助?那为什么呢? 如果你愿意,可以告诉我如何检测图像中的所有物体。
答案 0 :(得分:4)
您在ToPointsArray中没有做任何事情。你只是返回一个相同长度的数组。
你应该做这样的事情(我不知道IntPoint):
private System.Drawing.Point[] ToPointsArray(List<IntPoint> points)
{
System.Drawing.Point[] array = new System.Drawing.Point[points.Count];
int i = 0;
foreach (IntPoint p in points)
{
array[i++] = new System.Drawing.Point(p.X, p.Y);
}
return array;
}
此外,你在for循环中破坏了你的形象。此代码有效:
public void DetectCorners()
{
// Load image and create everything you need for drawing
Bitmap image = new Bitmap(@"C:\Users\ssammour\Desktop\Unbenannt.PNG");
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(image);
Bitmap result = new Bitmap(image.Width, image.Height, Graphics.FromImage(image));
Graphics g = Graphics.FromImage(result);
g.DrawImage(image,0,0);
Blob[] blobs = blobCounter.GetObjectsInformation();
SimpleShapeChecker shapeChecker = new SimpleShapeChecker();
Pen redPen = new Pen(Color.Red);
for (int i = 0, n = blobs.Length; i < n; i++)
{
List<IntPoint> corners;
List<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blobs[i]);
if (shapeChecker.IsQuadrilateral(edgePoints, out corners))
{
corners.Dump();
g.DrawPolygon(redPen, ToPointsArray(corners, image.Height));
}
}
result.Save(@"c:\result.png", ImageFormat.Png);
}
我得到了以下几点:
(0 0),(574 0),(574 398),(0 398)
(161 391),(162 390),(165 393),(165 394)
(301 394),(304 392),(310 398),(303 398)
(552 398),(558 392),(561 392),(562 398)
(155 397),(156 396),(157 398),(155 398)
所以,看起来BlobCounter并没有找到你想要的blob。