JPEGLosslessDecoder
A common DICOM compression format is JPEG Lossless. This format is generally not supported in standard JPEG decoder libraries.
This decoder can read data from the following DICOM transfer syntaxes:
- 1.2.840.10008.1.2.4.57 JPEG Lossless, Nonhierarchical (Processes 14)
- 1.2.840.10008.1.2.4.70 JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])
Usage (raw stream)
JPEGLosslessDecoder decoder = new JPEGLosslessDecoder(compressedBytes);
// single component
int[] decompressedData = decoder.decode()[0];
// rgb components
final int[][] decompressedData = decoder.decode();
final int[] redData = decompressedData[0];
final int[] greenData = decompressedData[1];
final int[] blueData = decompressedData[2];
Usage (BufferedImage)
JPEGLosslessDecoderWrapper decoder = new JPEGLosslessDecoderWrapper();
//currently supports 24 bit rgb, 16 & 8 bit grayscale
BufferedImage image = decoder.readImage(compressedBytes);
Building
ant build.xml
Acknowledgments
This decoder was originally written by Helmut Dersch. I added support for selection values 2 through 7, contributed bug fixes and code cleanup.