public static void Update(
string camera_devices,
int image_width,
int image_height,
int initial_frames,
string output_filename,
int exposure,
int no_of_captures,
int capture_interval_mS)
{
int[] directshow_filter_index = GetFilterIndexes();
if (directshow_filter_index != null)
{
Capture[] cam = new Capture[directshow_filter_index.Length];
int[] camera_filter_index = new int[directshow_filter_index.Length];
IntPtr[] m_ip = new IntPtr[directshow_filter_index.Length];
PictureBox[] preview = new PictureBox[directshow_filter_index.Length];
bool auto_exposure = false;
if (exposure <= 0) auto_exposure = true;
// get the devices
int no_of_cameras = 1;
if (camera_devices.Contains(","))
{
string[] str = camera_devices.Split(',');
no_of_cameras = str.Length;
if (no_of_cameras > cam.Length) no_of_cameras = cam.Length;
for (int i = 0; i < no_of_cameras; i++)
{
camera_filter_index[i] = Convert.ToInt32(str[i]);
m_ip[i] = IntPtr.Zero;
}
}
else
{
camera_filter_index[0] = Convert.ToInt32(camera_devices);
m_ip[0] = IntPtr.Zero;
}
Update(cam, preview, m_ip, no_of_cameras, image_width, image_height, directshow_filter_index, camera_filter_index, initial_frames, output_filename, exposure, auto_exposure, no_of_captures, capture_interval_mS);
}
}
private static void Update(
Capture[] cam,
PictureBox[] preview,
IntPtr[] m_ip,
int no_of_cameras,
int image_width,
int image_height,
int[] directshow_filter_index,
int[] camera_filter_index,
int initial_frames,
string output_filename,
int exposure,
bool auto_exposure,
int no_of_captures,
int capture_interval_mS)
{
DateTime start_time = DateTime.Now;
string output_format = "jpg";
if (output_filename.Contains("."))
{
string[] str = output_filename.Split('.');
output_filename = str[0];
output_format = str[1];
}
// create camera objects
for (int i = no_of_cameras-1; i >= 0; i--)
{
preview[i] = new PictureBox();
StartCamera(image_width, image_height, ref cam, directshow_filter_index, camera_filter_index, ref preview, i, exposure, auto_exposure);
}
TimeSpan setup_time = DateTime.Now.Subtract(start_time);
#if SHOW_TIMING
Console.WriteLine("Setup time: " + setup_time.TotalMilliseconds.ToString() + " mS");
#endif
ulong prev_itt = 0;
ulong itteration = 0;
start_time = DateTime.Now;
bool finished = false;
int start_camera_index = 0;
while (!finished)
{
Console.Write(".");
if (no_of_cameras > 1)
{
//for (int i = 0; i < no_of_cameras - 1; i += 2)
{
string filename = output_filename;
if (no_of_captures != 1) filename += itteration + "_";
if (no_of_cameras > 2) filename += start_camera_index.ToString() + (start_camera_index + 1).ToString() + "_";
CaptureFrames(cam[start_camera_index], cam[start_camera_index + 1], initial_frames, filename, output_format, m_ip[start_camera_index], m_ip[start_camera_index + 1]);
}
start_camera_index += 2;
if (start_camera_index >= no_of_cameras) start_camera_index = 0;
}
else
{
string filename = output_filename;
if (no_of_captures != 1) filename += itteration + "_";
CaptureFrame(cam[0], initial_frames, filename, output_format, m_ip[0]);
}
itteration++;
if ((no_of_captures > 0) &&
(itteration >= (ulong)no_of_captures))
{
finished = true;
}
else
{
//for (int i = 0; i < 50; i++) Thread.Sleep(2);
// wait for a while
ulong itt = prev_itt;
while (itt <= prev_itt)
{
TimeSpan diff = DateTime.Now.Subtract(start_time);
itt = (ulong)(diff.TotalMilliseconds / capture_interval_mS);
Thread.Sleep(5);
}
prev_itt = itt;
}
}
Console.WriteLine("");
TimeSpan capture_time = DateTime.Now.Subtract(start_time);
#if SHOW_CAPTURE_TIME
Console.WriteLine("Capture time: " + capture_time.TotalMilliseconds.ToString() + " mS");
#endif
start_time = DateTime.Now;
// dispose camera objects
for (int i = 0; i < no_of_cameras; i++)
if (cam[i] != null) cam[i].Dispose();
TimeSpan close_time = DateTime.Now.Subtract(start_time);
#if SHOW_TIMING
Console.WriteLine("Close time: " + close_time.TotalMilliseconds.ToString() + " mS");
#endif
}
/// <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();
}
}
private static void StartCamera(
int image_width,
int image_height,
ref Capture[] cam,
int[] directshow_filter_index,
int[] camera_filter_index,
ref PictureBox[] preview,
int index,
int exposure,
bool auto_exposure)
{
cam[index] = new Capture(directshow_filter_index[camera_filter_index[index]], image_width, image_height, preview[index], true);
if (cam[index] != null)
{
if (!cam[index].Active)
{
// if still image capture mode fails
// use regular video capture
// trash the previous object
cam[index].Dispose();
// then try again
cam[index] = new Capture(directshow_filter_index[camera_filter_index[index]], image_width, image_height, preview[index], false);
}
if (cam[index] != null)
{
// set the initial exposure value
if (auto_exposure)
cam[index].SetExposureAuto();
else
cam[index].SetExposure(exposure);
cam[index].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();
}
}
}
