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Basic Image Thresholding
This example thresholds monochromatic TestImage output image using ThresholdImage function and displays it in the picture box. To have the example work, a single form with PictureBox and TrackBar controls is needed. Changing the trackbar position changes the threshold and displays updated result image in the PictureBox.
//... using System.Linq; using AvlNet; //... public partial class Form1 : Form { Image lenaMonoImage; public Form1() { InitializeComponent(); //prepare reusable lena image that will be thresholded Image lenaRGBImage; //dummy TestImage output AVL.TestImage(TestImageId.Lena, out lenaRGBImage, out lenaMonoImage); } private void trackBar1_ValueChanged(object sender, EventArgs e) { //get thresholded image with AVL function. //In the form designer trackBar1 Maximum property is set to 255 //so the thresholding may be performed in the full range. Image thresholdedImage; AVL.ThresholdImage(lenaMonoImage, null, null, trackBar1.Value, 1.0f, out thresholdedImage); //dispose previously displayed image if (pictureBox1.Image != null) pictureBox1.Image.Dispose(); //create .NET Bitmap that can be displayed by the PictureBox control pictureBox1.Image = thresholdedImage.CreateBitmap(); //dispose AVL image. It's copy is already displayed in the pictureBox. thresholdedImage.Dispose(); }
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