/// <summary>
/// Called when the button is clicked to open the video/image.
/// </summary>
private void button1_Click(object sender, EventArgs e)
{
// show file dialog, and continue only if OK was chosen.
OpenFileDialog dialog = new OpenFileDialog();
if (dialog.ShowDialog() != DialogResult.OK)
{
return;
}
// open and play the file (errors are not handled nicely here).
videoPlayer1.Open(dialog.FileName);
// open the video writer (close previously opened writer).
if (writer != null)
{
writer.Release();
}
writer = videoPlayer1.CreateVideoWriter("c:\\myoutput.avi");
// start the video.
videoPlayer1.Play();
}
private void Work()
{
CVImage frame;
try
{
while (true)
{
ReopenCapture();
while ((frame = cap.QueryFrame()) != null)
{
for (int row = 0; row < frame.Height; ++row)
{
for (int col = 0; col < frame.Width; ++col)
{
CVRgbPixel pixel = frame[row, col];
// get black and white value for this pixel.
byte bwValue = pixel.BwValue;
// accumulate the new value to the moving average.
double val = (double)bwValue / 255.0;
avg.Accumulate(row, col, val);
// calculate the diff between the frame and the average up until now.
double delta = val - avg[row, col];
// if delta is smaller than the threshold, eliminate the background.
if (delta < Threshold)
{
// set the color of the background frame to black.
frame[row, col] = backgroundColor;
}
else
{
// if monochrome is checked, set pixel to foreground color.
if (monochrome.Checked)
{
frame[row, col] = foregroundColor;
}
}
}
}
// display the updated frame on the window.
cvPanel.Image = frame.ToBitmap();
if (vw != null)
{
vw.WriteFrame(frame);
}
// delay for 20ms.
Thread.Sleep(20);
frame.Release();
}
}
}
catch (CVException e1)
{
MessageBox.Show(e1.Message);
}
catch (ThreadAbortException)
{
Console.WriteLine("Aborting thread...");
}
finally
{
if (cap != null)
{
cap.Release();
}
if (vw != null)
{
vw.Release();
}
}
}