/// <summary>
/// Called by the video player to handle the next video frame.
/// </summary>
private void videoPlayer1_NextFrame(OpenCVDotNet.UI.VideoPlayer sender, OpenCVDotNet.UI.NextFrameEventArgs args)
{
// args.Frame contains the frame to be handled.
CVImage frame = args.Frame;
// go over all the pixels (rows, cols)
for (int y = 0; y < frame.Height; ++y)
{
for (int x = 0; x < frame.Width; ++x)
{
CVRgbPixel pixel = frame[y, x];
// invert RGB colors.
frame[y, x] = new CVRgbPixel(
(byte)(255 - pixel.R),
(byte)(255 - pixel.G),
(byte)(255 - pixel.B));
}
}
// assign resulting frame to picture box as a bitmap.
pictureBox1.Image = frame.ToBitmap();
writer.WriteFrame(frame);
}
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();
}
}
}