C#AForge.Net图像处理在image上绘图
C# AForge.Net image processing drawing on image
我正在使用这个例子:
http://www.aforgenet.com/framework/features/blobs_processing.html
我尝试使用最后一个示例并在单击按钮后在图片框中显示输出:
using AForge;
using AForge.Imaging;
using AForge.Imaging.Filters;
using AForge.Math.Geometry;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Image_Processing_testings
{
public partial class Form1 : Form
{
Bitmap image = null;
public Form1()
{
InitializeComponent();
Bitmap bitmap = new Bitmap("C:\Users\user\Desktop\test.png");
Bitmap gsImage = Grayscale.CommonAlgorithms.BT709.Apply(bitmap);
DifferenceEdgeDetector filter = new DifferenceEdgeDetector();
image = filter.Apply(gsImage);
// process image with blob counter
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(image);
Blob[] blobs = blobCounter.GetObjectsInformation();
// create convex hull searching algorithm
GrahamConvexHull hullFinder = new GrahamConvexHull();
// lock image to draw on it
BitmapData data = image.LockBits(
new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.ReadWrite, image.PixelFormat);
int i = 0;
// process each blob
foreach (Blob blob in blobs)
{
List<IntPoint> leftPoints, rightPoints, edgePoints = new List<IntPoint>();
// get blob's edge points
blobCounter.GetBlobsLeftAndRightEdges(blob,
out leftPoints, out rightPoints);
edgePoints.AddRange(leftPoints);
edgePoints.AddRange(rightPoints);
// blob's convex hull
List<IntPoint> hull = hullFinder.FindHull(edgePoints);
Drawing.Polygon(data, hull, Color.Red);
i++;
}
image.UnlockBits(data);
MessageBox.Show("Found: " + i + " Objects");
}
private void button1_Click_1(object sender, EventArgs e)
{
pictureBox1.Image = image;
}
}
}
结果是我得到了过滤后的图像,但上面没有任何多边形。
我计算了斑点的数量,这张图片有 3 个:
您提供的 link 中的示例假设白色像素属于对象,黑色像素属于背景。您提供的图像恰恰相反。因此,在应用该算法之前反转图像应该可以工作。
我正在使用这个例子: http://www.aforgenet.com/framework/features/blobs_processing.html
我尝试使用最后一个示例并在单击按钮后在图片框中显示输出:
using AForge;
using AForge.Imaging;
using AForge.Imaging.Filters;
using AForge.Math.Geometry;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Image_Processing_testings
{
public partial class Form1 : Form
{
Bitmap image = null;
public Form1()
{
InitializeComponent();
Bitmap bitmap = new Bitmap("C:\Users\user\Desktop\test.png");
Bitmap gsImage = Grayscale.CommonAlgorithms.BT709.Apply(bitmap);
DifferenceEdgeDetector filter = new DifferenceEdgeDetector();
image = filter.Apply(gsImage);
// process image with blob counter
BlobCounter blobCounter = new BlobCounter();
blobCounter.ProcessImage(image);
Blob[] blobs = blobCounter.GetObjectsInformation();
// create convex hull searching algorithm
GrahamConvexHull hullFinder = new GrahamConvexHull();
// lock image to draw on it
BitmapData data = image.LockBits(
new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.ReadWrite, image.PixelFormat);
int i = 0;
// process each blob
foreach (Blob blob in blobs)
{
List<IntPoint> leftPoints, rightPoints, edgePoints = new List<IntPoint>();
// get blob's edge points
blobCounter.GetBlobsLeftAndRightEdges(blob,
out leftPoints, out rightPoints);
edgePoints.AddRange(leftPoints);
edgePoints.AddRange(rightPoints);
// blob's convex hull
List<IntPoint> hull = hullFinder.FindHull(edgePoints);
Drawing.Polygon(data, hull, Color.Red);
i++;
}
image.UnlockBits(data);
MessageBox.Show("Found: " + i + " Objects");
}
private void button1_Click_1(object sender, EventArgs e)
{
pictureBox1.Image = image;
}
}
}
结果是我得到了过滤后的图像,但上面没有任何多边形。
我计算了斑点的数量,这张图片有 3 个:
您提供的 link 中的示例假设白色像素属于对象,黑色像素属于背景。您提供的图像恰恰相反。因此,在应用该算法之前反转图像应该可以工作。