/// <summary>
/// Read a filter bank image from a stream.
/// </summary>
/// <param name="stream">The stream containing the filter bank image</param>
/// <returns>The filter bank image</returns>
public static unsafe FilterBankImage Read(Stream stream)
{
FilterBankImage image = new FilterBankImage();
BinaryReader input = new BinaryReader(stream);
int rows = input.ReadInt32();
int columns = input.ReadInt32();
int channels = input.ReadInt32();
image.SetDimensions(rows, columns, channels);
fixed(float *dataSrc = image.RawArray)
{
float *dataPtr = dataSrc;
for (int r = 0; r < image.Rows; r++)
{
for (int c = 0; c < image.Columns; c++)
{
for (int i = 0; i < image.Channels; i++, dataPtr++)
{
*dataPtr = input.ReadSingle();
}
}
}
}
return(image);
}
/// <summary>
/// Create a new Filter Bank Image. The input image is run through the provided filter banks and their responses are concatenated together to form the channels of the image.
/// </summary>
/// <param name="input">The input image</param>
/// <param name="filterBanks">The filter banks to apply</param>
/// <returns>The image</returns>
public static unsafe FilterBankImage Create(IMultichannelImage <float> input, params FilterBank[] filterBanks)
{
FilterBankImage image = new FilterBankImage();
image.SetDimensions(input.Rows, input.Columns, filterBanks.Sum(o => o.DescriptorLength));
fixed(float *dataSrc = image.RawArray)
{
float *dataPtr = dataSrc;
for (short r = 0; r < input.Rows; r++)
{
for (short c = 0; c < input.Columns; c++)
{
ImageDataPoint <float> point = new ImageDataPoint <float>(input, r, c, 0);
foreach (var fb in filterBanks)
{
float[] values = fb.Compute(point);
for (int i = 0; i < values.Length; i++, dataPtr++)
{
*dataPtr = values[i];
}
}
}
}
}
return(image);
}