/// <summary>
/// Detect edge transitions using value deltas
/// </summary>
/// <param name="parms">Detection parameters</param>
public void DetectEdges(DetectorParams parms)
{
Bitmap srcImg = parms.SourceImage;
int threshold = parms.Threshold;
Bitmap destImg = new Bitmap(srcImg.Width, srcImg.Height);
float step = 100f / (float)(srcImg.Height + 1);
State = DetectorState.Processing;
int[,] levels = DetectorHelper.GetChannel(srcImg, parms.Channel, UpdateUi);
for (int y = 0; y < destImg.Height - 1 && State == DetectorState.Processing; y++)
{
for (int x = 0; x < destImg.Width - 1; x++)
{
int dx = levels[x + 1, y] - levels[x, y];
int dy = levels[x, y + 1] - levels[x, y];
Color rgb = (dx > threshold || dy > threshold) ? Color.White : Color.Black;
destImg.SetPixel(x, y, rgb);
}
UpdateUi(50 + y * 50 / destImg.Height);
}
EndUpdate(destImg);
State = DetectorState.Ready;
}
/// <summary>
/// Update the image details for the current image
/// </summary>
private void UpdateDetails()
{
DetectorParams parms = _images[_imageIndex];
TbImageIndex.Text = (_imageIndex + 1).ToString();
TbTotalImages.Text = _images.Count.ToString();
if (parms.DestImage != null)
{
TbImageSize.Text = string.Format("{0} x {1}", parms.DestImage.Width, parms.DestImage.Height);
}
else
{
TbImageSize.Text = "";
}
if (parms.Detector != null)
{
TbImageAlg.Text = parms.Detector.Name;
TbImageThreshold.Text = parms.Threshold.ToString();
TbImageChannel.Text = parms.Channel.ToString();
}
else
{
TbImageAlg.Text = "";
TbImageThreshold.Text = "";
TbImageChannel.Text = "";
}
}
private void BtnOpenFile_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.InitialDirectory = Directory.GetCurrentDirectory();
if (ofd.ShowDialog() == DialogResult.OK)
{
Stream fs = null;
try
{
fs = ofd.OpenFile();
Image img = Image.FromStream(fs);
DetectorParams parm = new DetectorParams();
parm.DestImage = new Bitmap(img);
_images.Add(parm);
_imageIndex = _images.Count - 1;
UpdateDetails();
PbImage.Image = img;
PbImage.SizeMode = PictureBoxSizeMode.Zoom;
Text = string.Format("Edge Detect - {0} ({1},{2})",
Path.GetFileName(ofd.FileName),
img.Width,
img.Height);
}
finally
{
if (fs != null)
{
fs.Dispose();
}
}
}
}
/// <summary>
/// Called when detection is complete
/// </summary>
/// <param name="result">Image created from edge detection</param>
void DetectUpdateEnd(Bitmap result)
{
if (InvokeRequired)
{
Invoke((MethodInvoker) delegate { DetectUpdateEnd(result); });
}
else
{
// Update current then add to the list
_currentParams.DestImage = result;
_images.Add(_currentParams);
_imageIndex = _images.Count - 1;
_currentParams = null;
CmbChannel.Enabled = true;
CmbEdgeDector.Enabled = true;
BtnDetect.Text = "Detect";
DetectProgress.Visible = false;
UpdateDetails();
PbImage.Image = result;
PbImage.Invalidate();
}
}
/// <summary>
/// User clicked [Detect] button. If active, stop the detection process. Otherwise start a new detection thread.
/// </summary>
private void BtnDetect_Click(object sender, EventArgs e)
{
if (_currentParams != null && _currentParams.Detector.State == DetectorState.Processing)
{
_currentParams.Detector.State = DetectorState.Abort;
}
else
{
DetectProgress.Value = 0;
DetectProgress.Visible = true;
CmbEdgeDector.Enabled = false;
CmbChannel.Enabled = false;
BtnDetect.Text = "Stop";
_currentParams = new DetectorParams();
_currentParams.Detector = CmbEdgeDector.SelectedItem as IEdgeDetector;
_currentParams.SourceImage = _images[_imageIndex].DestImage;
_currentParams.Threshold = int.Parse(TbThreshold.Text);
_currentParams.Channel = (DetectorChannel)CmbChannel.SelectedIndex;
Thread thd = new Thread(StartDetect);
thd.Start();
}
}
