public override void Decode(
DicomPixelData oldPixelData,
DicomPixelData newPixelData,
DicomCodecParams parameters)
{
if (oldPixelData.NumberOfFrames == 0)
{
return;
}
// IJG eats the extra padding bits. Is there a better way to test for this?
if (newPixelData.BitsAllocated == 16 && newPixelData.BitsStored <= 8)
{
// check for embedded overlays here or below?
newPixelData.BitsAllocated = 8;
}
var jparams = parameters as DicomJpegParams ?? GetDefaultParameters() as DicomJpegParams;
var oldNativeData = oldPixelData.ToNativePixelData();
int precision;
try
{
try
{
precision = JpegHelper.ScanJpegForBitDepth(oldPixelData);
}
catch
{
// if the internal scanner chokes on an image, try again using ijg
precision = new Jpeg12Codec(JpegMode.Baseline, 0, 0).ScanHeaderForPrecision(oldNativeData);
}
}
catch
{
// the old scanner choked on several valid images...
// assume the correct encoder was used and let libijg handle the rest
precision = oldPixelData.BitsStored;
}
if (newPixelData.BitsStored <= 8 && precision > 8)
{
newPixelData.BitsAllocated = 16; // embedded overlay?
}
var codec = GetCodec(precision, jparams);
var newNativeData = newPixelData.ToNativePixelData();
var jNativeParams = jparams.ToNativeJpegParameters();
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
codec.Decode(oldNativeData, newNativeData, jNativeParams, frame);
}
}
public override void Decode(
DicomPixelData oldPixelData,
DicomPixelData newPixelData,
DicomCodecParams parameters)
{
if (oldPixelData.NumberOfFrames == 0) return;
// IJG eats the extra padding bits. Is there a better way to test for this?
if (newPixelData.BitsAllocated == 16 && newPixelData.BitsStored <= 8)
{
// check for embedded overlays here or below?
newPixelData.BitsAllocated = 8;
}
var jparams = parameters as DicomJpegParams ?? GetDefaultParameters() as DicomJpegParams;
var oldNativeData = oldPixelData.ToNativePixelData();
int precision;
try
{
try
{
precision = JpegHelper.ScanJpegForBitDepth(oldPixelData);
}
catch
{
// if the internal scanner chokes on an image, try again using ijg
precision = new Jpeg12Codec(JpegMode.Baseline, 0, 0).ScanHeaderForPrecision(oldNativeData);
}
}
catch
{
// the old scanner choked on several valid images...
// assume the correct encoder was used and let libijg handle the rest
precision = oldPixelData.BitsStored;
}
if (newPixelData.BitsStored <= 8 && precision > 8) newPixelData.BitsAllocated = 16; // embedded overlay?
var codec = GetCodec(precision, jparams);
var newNativeData = newPixelData.ToNativePixelData();
var jNativeParams = jparams.ToNativeJpegParameters();
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
codec.Decode(oldNativeData, newNativeData, jNativeParams, frame);
}
}
