protected override IJpegNativeCodec GetCodec(int bits, DicomJpegParams jparams)
{
if (bits <= 8) return new Jpeg8Codec(JpegMode.Lossless, jparams.Predictor, jparams.PointTransform);
if (bits <= 12) return new Jpeg12Codec(JpegMode.Lossless, jparams.Predictor, jparams.PointTransform);
if (bits <= 16) return new Jpeg16Codec(JpegMode.Lossless, jparams.Predictor, jparams.PointTransform);
throw new DicomCodecException("Unable to create JPEG Process 14 codec for bits stored == {0}", bits);
}
protected override IJpegNativeCodec GetCodec(int bits, DicomJpegParams jparams)
{
if (bits == 8)
{
return(new Jpeg8Codec(JpegMode.Baseline, 0, 0));
}
throw new DicomCodecException("Unable to create JPEG Process 1 codec for bits stored == {0}", bits);
}
protected override IJpegNativeCodec GetCodec(int bits, DicomJpegParams jparams)
{
if (bits == 8)
return new Jpeg8Codec(JpegMode.Sequential, 0, 0);
if (bits <= 12)
return new Jpeg12Codec(JpegMode.Sequential, 0, 0);
throw new DicomCodecException("Unable to create JPEG Process 4 codec for bits stored == {0}", bits);
}
/// <summary>
/// Loads the pixel data for specified frame and set the internal dataset
///
/// </summary>
/// <param name="dataset">dataset to load pixeldata from</param>
/// <param name="frame">The frame number to create pixeldata for</param>
private void Load(DicomDataset dataset, int frame)
{
Dataset = dataset;
if (PixelData == null)
{
PixelData = DicomPixelData.Create(Dataset);
PhotometricInterpretation = PixelData.PhotometricInterpretation;
}
if (Dataset.InternalTransferSyntax.IsEncapsulated)
{
// decompress single frame from source dataset
DicomCodecParams cparams = null;
if (Dataset.InternalTransferSyntax == DicomTransferSyntax.JPEGProcess1 || Dataset.InternalTransferSyntax == DicomTransferSyntax.JPEGProcess2_4)
{
cparams = new DicomJpegParams {
ConvertColorspaceToRGB = true
};
}
var transcoder = new DicomTranscoder(Dataset.InternalTransferSyntax, DicomTransferSyntax.ExplicitVRLittleEndian);
transcoder.InputCodecParams = cparams;
transcoder.OutputCodecParams = cparams;
var buffer = transcoder.DecodeFrame(Dataset, frame);
// clone the dataset because modifying the pixel data modifies the dataset
var clone = Dataset.Clone();
clone.InternalTransferSyntax = DicomTransferSyntax.ExplicitVRLittleEndian;
var pixelData = DicomPixelData.Create(clone, true);
pixelData.AddFrame(buffer);
// temporary fix for JPEG compressed YBR images
if ((Dataset.InternalTransferSyntax == DicomTransferSyntax.JPEGProcess1 || Dataset.InternalTransferSyntax == DicomTransferSyntax.JPEGProcess2_4) && pixelData.SamplesPerPixel == 3)
{
pixelData.PhotometricInterpretation = PhotometricInterpretation.Rgb;
}
_pixelData = PixelDataFactory.Create(pixelData, 0);
}
else
{
// pull uncompressed frame from source pixel data
_pixelData = PixelDataFactory.Create(PixelData, frame);
}
_pixelData.Rescale(_scale);
_overlays = DicomOverlayData.FromDataset(Dataset).Where(x => x.Type == DicomOverlayType.Graphics && x.Data != null).ToArray();
_currentFrame = frame;
CreatePipeline();
}
protected override IJpegNativeCodec GetCodec(int bits, DicomJpegParams jparams)
{
if (bits <= 8)
{
return(new Jpeg8Codec(JpegMode.Lossless, 1, jparams.PointTransform));
}
if (bits <= 12)
{
return(new Jpeg12Codec(JpegMode.Lossless, 1, jparams.PointTransform));
}
if (bits <= 16)
{
return(new Jpeg16Codec(JpegMode.Lossless, 1, jparams.PointTransform));
}
throw new DicomCodecException("Unable to create JPEG Process 14 [SV1] codec for bits stored == {0}", bits);
}
