/// <summary>
/// grabs frames from two cameras
/// </summary>
protected static void CaptureFrames(
int start_camera_index,
WebcamVisionDirectShowCapture[] cam,
int initial_frames,
string output_filename,
string output_format,
IntPtr[] m_ip,
bool save_images,
int exposure,
bool use_pause,
ref string left_image_filename,
ref string right_image_filename,
ref Bitmap left_image_bitmap,
ref Bitmap right_image_bitmap,
ref DateTime left_image_capture,
ref DateTime right_image_capture)
{
const int step_size = 5; // when checking if frames are blank
if (left_image_bitmap != null)
{
left_image_bitmap.Dispose();
}
if (right_image_bitmap != null)
{
right_image_bitmap.Dispose();
}
if ((cam[start_camera_index] != null) && (cam[start_camera_index + 1] != null))
{
/*
* if (m_ip[start_camera_index] != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip[start_camera_index]);
* m_ip[start_camera_index] = IntPtr.Zero;
* }
*
* if (m_ip[start_camera_index+1] != IntPtr.Zero)
* {
* Marshal.FreeCoTaskMem(m_ip[start_camera_index+1]);
* m_ip[start_camera_index+1] = IntPtr.Zero;
* }
*/
for (int i = 0; i < 2; i++)
{
WebcamVisionDirectShowCapture c = cam[start_camera_index];
if (i > 0)
{
c = cam[start_camera_index + 1];
}
// start rolling the cameras
if (c.lastFrame != null)
{
c.lastFrame.Dispose();
}
c.Resume();
}
// grab frames
Bitmap grabbed_image0 = null;
Bitmap grabbed_image1 = null;
bool is_blank0 = true;
bool is_blank1 = true;
DateTime left_image_cap = DateTime.Now;
DateTime right_image_cap = DateTime.Now;
//for (int j = 0; j < 2; j++)
Parallel.For(0, 2, delegate(int j)
{
for (int i = 0; i < initial_frames + 1; i++)
{
if (j == 0)
{
left_image_cap = DateTime.Now;
cam[start_camera_index].SetExposure(exposure);
grabbed_image0 = cam[start_camera_index].Grab(ref m_ip[start_camera_index], true);
is_blank0 = IsBlankFrame(grabbed_image0, step_size);
if ((!is_blank0) && (i > 1))
{
break;
}
}
else
{
right_image_cap = DateTime.Now;
cam[start_camera_index + 1].SetExposure(exposure);
grabbed_image1 = cam[start_camera_index + 1].Grab(ref m_ip[start_camera_index + 1], true);
is_blank1 = IsBlankFrame(grabbed_image1, step_size);
if ((!is_blank0) && (i > 1))
{
break;
}
}
}
});
left_image_capture = left_image_cap;
right_image_capture = right_image_cap;
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;
}
left_image_bitmap = grabbed_image0;
right_image_bitmap = grabbed_image1;
left_image_filename = output_filename + "0." + output_format;
right_image_filename = output_filename + "1." + output_format;
try
{
if (save_images)
{
grabbed_image0.Save(left_image_filename, format);
grabbed_image1.Save(right_image_filename, format);
}
}
catch
{
left_image_filename = "";
right_image_filename = "";
}
}
for (int i = 0; i < 2; i++)
{
WebcamVisionDirectShowCapture c = cam[start_camera_index];
if (i > 0)
{
c = cam[start_camera_index + 1];
}
// stop the camera
if (use_pause)
{
c.Pause();
}
else
{
c.Stop();
}
}
}
}
/// <summary>
/// grabs a frame from the camera
/// </summary>
protected static void CaptureFrame(
WebcamVisionDirectShowCapture cam,
int initial_frames,
string output_filename,
string output_format,
ref IntPtr m_ip,
int exposure,
bool use_pause)
{
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;
}
}
cam.SetExposure(exposure);
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
if (use_pause)
{
cam.Pause();
}
else
{
cam.Stop();
}
}
}
/// <summary>
/// grabs a frame from the camera
/// </summary>
protected static void CaptureFrame(
WebcamVisionDirectShowCapture cam,
int initial_frames,
string output_filename,
string output_format,
ref IntPtr m_ip,
int exposure,
bool use_pause)
{
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;
}
}
cam.SetExposure(exposure);
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
if (use_pause)
cam.Pause();
else
cam.Stop();
}
}
