/// <summary>
/// Captures an image from a video
/// </summary>
/// <param name="source_video">FileInfo contia</param>
/// <param name="capture_time">Time in seconds at which you want to capture the image</param>
/// <param name="sleep_time">Time in milliseconds to sleep so that MediaPlayer doesn't crap itself</param>
/// <returns>A System.Drawing.Bitmap captured from the video</returns>
public static Bitmap Capture(FileInfo source_video, double capture_time, int sleep_time)
{
try
{
MediaPlayer paused_video = InternalTools.GetPausedVideo(source_video.FullName, capture_time, sleep_time);
BitmapFrame image_data_at_position = InternalTools.GetVideoImageData(paused_video);
BitmapEncoder image_data_encoder = InternalTools.GetImageDataEncoder(image_data_at_position);
Bitmap captured_bitmap;
using (MemoryStream stream = new MemoryStream())
{
image_data_encoder.Frames.Add(image_data_at_position);
image_data_encoder.Save(stream);
byte[] bit = stream.ToArray();
captured_bitmap = Bitmap.FromStream(stream) as Bitmap;
stream.Close();
}
return(captured_bitmap);
}
catch (Exception e)
{
throw new ImagingTools.MediaToolsGenericException(
"Capture_Bitmap.Capture(FileInfo source_video, double capture_time, int sleep_time)",
e
);
}
}
/// <summary>
/// Scale a bitmap to a max dimension, maintaining the original aspect ratio
/// </summary>
/// <param name="source_bitmap"></param>
/// <param name="max_dimension_value"></param>
/// <returns>Scaled System.Drawing.Bitmap</returns>
public static Bitmap Scale(Bitmap source_bitmap, int max_dimension_value)
{
try
{
System.Drawing.Size new_size = InternalTools.GetScaledSize(source_bitmap, max_dimension_value);
return(BitmapTools.Resize(source_bitmap, new_size.Width, new_size.Height));
}
catch (Exception e)
{
throw new ImagingTools.MediaToolsGenericException(
"Save_Bitmap.Save(Bitmap source_bitmap, FileInfo saved_bitmap_file_info)",
e
);
}
}
public static float GetDerivedDimension(
float constant_value,
float max_dimension_value,
float derived_value
)
{
ResizeType resize_type = InternalTools.GetResizeType(
(int)constant_value,
(int)max_dimension_value
);
float multiplier = 0f;
if (resize_type == ResizeType.Reduction)
{
multiplier = max_dimension_value / constant_value;
}
else
{
multiplier = constant_value / max_dimension_value;
}
return(derived_value * multiplier);
}
/// <summary>
/// Make a grayscale copy of the bitmap
/// </summary>
/// <param name="source_bitmap">The System.Drawing.Bitmap you want to convert</param>
/// <returns>Grayscale copy of the original bitmap</returns>
public static Bitmap Desaturate(Bitmap source_bitmap)
{
try
{
Rectangle source_rectangle = new Rectangle(0, 0, source_bitmap.Width, source_bitmap.Height);
//create a blank bitmap the same size as original
Bitmap desaturated_bitmap = new Bitmap(source_bitmap.Width, source_bitmap.Height);
Graphics g = Graphics.FromImage(desaturated_bitmap);
ImageAttributes desaturated_bitmap_attributes = new ImageAttributes();
desaturated_bitmap_attributes.SetColorMatrix(InternalTools.GetGrayscaleMatrix());
//draw the original image on the new image
//using the grayscale color matrix
g.DrawImage(
source_bitmap,
source_rectangle,
0,
0,
source_bitmap.Width,
source_bitmap.Height,
GraphicsUnit.Pixel,
desaturated_bitmap_attributes
);
//dispose the Graphics object
g.Dispose();
return(desaturated_bitmap);
}
catch (Exception e)
{
throw new ImagingTools.MediaToolsGenericException(
"Save_Bitmap.Save(Bitmap source_bitmap, FileInfo saved_bitmap_file_info)",
e
);
}
}
