/// <summary>
/// grabs a frame from the camera
/// </summary>
private static void CaptureFrame(
Capture cam,
int initial_frames,
string output_filename,
string output_format,
IntPtr m_ip)
{
if (cam != null)
{
// start rolling the cameras
if (cam.lastFrame != null)
{
cam.lastFrame.Dispose();
}
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
cam.Resume();
// grab frames
for (int i = 0; i < initial_frames; i++)
{
cam.Grab(ref m_ip, false);
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
}
Bitmap grabbed_image = cam.Grab(ref m_ip, true);
if (grabbed_image != null)
{
System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
output_format = output_format.ToLower();
if (output_format == "bmp")
{
format = System.Drawing.Imaging.ImageFormat.Bmp;
}
if (output_format == "png")
{
format = System.Drawing.Imaging.ImageFormat.Png;
}
if (output_format == "gif")
{
format = System.Drawing.Imaging.ImageFormat.Gif;
}
grabbed_image.Save(output_filename + "." + output_format, format);
}
// stop the camera
cam.Stop();
}
}
/// <summary>
/// grabs a frame from the camera
/// </summary>
private static void CaptureFrame(
Capture cam,
int initial_frames,
string output_filename,
string output_format,
IntPtr m_ip)
{
if (cam != null)
{
// start rolling the cameras
if (cam.lastFrame != null)
cam.lastFrame.Dispose();
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
cam.Resume();
// grab frames
for (int i = 0; i < initial_frames; i++)
{
cam.Grab(ref m_ip, false);
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
}
Bitmap grabbed_image = cam.Grab(ref m_ip, true);
if (grabbed_image != null)
{
System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
output_format = output_format.ToLower();
if (output_format == "bmp") format = System.Drawing.Imaging.ImageFormat.Bmp;
if (output_format == "png") format = System.Drawing.Imaging.ImageFormat.Png;
if (output_format == "gif") format = System.Drawing.Imaging.ImageFormat.Gif;
grabbed_image.Save(output_filename + "." + output_format, format);
}
// stop the camera
cam.Stop();
}
}
/// <summary>
/// grabs frames from two cameras
/// </summary>
private static void CaptureFrames(
Capture cam0,
Capture cam1,
int initial_frames,
string output_filename,
string output_format,
IntPtr m_ip0,
IntPtr m_ip1)
{
const int step_size = 5; // when checking if frames are blank
if ((cam0 != null) && (cam1 != null))
{
/*
if (m_ip0 != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip0);
m_ip0 = IntPtr.Zero;
}
if (m_ip1 != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip1);
m_ip1 = IntPtr.Zero;
}
*/
for (int i = 0; i < 2; i++)
{
Capture cam = cam0;
if (i > 0) cam = cam1;
// start rolling the cameras
if (cam.lastFrame != null)
cam.lastFrame.Dispose();
cam.Resume();
}
// grab frames
Bitmap grabbed_image0 = null;
Bitmap grabbed_image1 = null;
bool is_blank0 = true;
bool is_blank1 = true;
Parallel.For(0, 2, delegate(int j)
{
for (int i = 0; i < initial_frames + 1; i++)
{
if (j == 0)
{
/*
if (m_ip0 != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip0);
m_ip0 = IntPtr.Zero;
}
*/
grabbed_image0 = cam0.Grab(ref m_ip0, true);
is_blank0 = IsBlankFrame(grabbed_image0, step_size);
if (!is_blank0) break;
}
else
{
/*
if (m_ip1 != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip1);
m_ip1 = IntPtr.Zero;
}
*/
grabbed_image1 = cam1.Grab(ref m_ip1, true);
is_blank1 = IsBlankFrame(grabbed_image1, step_size);
if (!is_blank1) break;
}
}
} );
if ((grabbed_image0 != null) &&
(grabbed_image1 != null))
{
System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
output_format = output_format.ToLower();
if (output_format == "bmp") format = System.Drawing.Imaging.ImageFormat.Bmp;
if (output_format == "png") format = System.Drawing.Imaging.ImageFormat.Png;
if (output_format == "gif") format = System.Drawing.Imaging.ImageFormat.Gif;
grabbed_image0.Save(output_filename + "0." + output_format, format);
grabbed_image1.Save(output_filename + "1." + output_format, format);
}
for (int i = 0; i < 2; i++)
{
Capture cam = cam0;
if (i > 0) cam = cam1;
// stop the camera
cam.Stop();
}
}
}
/// <summary>
/// grabs frames from two cameras
/// </summary>
private static void CaptureFrames(
Capture cam0,
Capture cam1,
int initial_frames,
string output_filename,
string output_format,
IntPtr m_ip0,
IntPtr m_ip1)
{
const int step_size = 5; // when checking if frames are blank
if ((cam0 != null) && (cam1 != null))
{
/*
* if (m_ip0 != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip0);
* m_ip0 = IntPtr.Zero;
* }
*
* if (m_ip1 != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip1);
* m_ip1 = IntPtr.Zero;
* }
*/
for (int i = 0; i < 2; i++)
{
Capture cam = cam0;
if (i > 0)
{
cam = cam1;
}
// start rolling the cameras
if (cam.lastFrame != null)
{
cam.lastFrame.Dispose();
}
cam.Resume();
}
// grab frames
Bitmap grabbed_image0 = null;
Bitmap grabbed_image1 = null;
bool is_blank0 = true;
bool is_blank1 = true;
Parallel.For(0, 2, delegate(int j)
{
for (int i = 0; i < initial_frames + 1; i++)
{
if (j == 0)
{
/*
* if (m_ip0 != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip0);
* m_ip0 = IntPtr.Zero;
* }
*/
grabbed_image0 = cam0.Grab(ref m_ip0, true);
is_blank0 = IsBlankFrame(grabbed_image0, step_size);
if (!is_blank0)
{
break;
}
}
else
{
/*
* if (m_ip1 != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip1);
* m_ip1 = IntPtr.Zero;
* }
*/
grabbed_image1 = cam1.Grab(ref m_ip1, true);
is_blank1 = IsBlankFrame(grabbed_image1, step_size);
if (!is_blank1)
{
break;
}
}
}
});
if ((grabbed_image0 != null) &&
(grabbed_image1 != null))
{
System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
output_format = output_format.ToLower();
if (output_format == "bmp")
{
format = System.Drawing.Imaging.ImageFormat.Bmp;
}
if (output_format == "png")
{
format = System.Drawing.Imaging.ImageFormat.Png;
}
if (output_format == "gif")
{
format = System.Drawing.Imaging.ImageFormat.Gif;
}
grabbed_image0.Save(output_filename + "0." + output_format, format);
grabbed_image1.Save(output_filename + "1." + output_format, format);
}
for (int i = 0; i < 2; i++)
{
Capture cam = cam0;
if (i > 0)
{
cam = cam1;
}
// stop the camera
cam.Stop();
}
}
}