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Codecs

The cornnerstoneWADOImageLoader uses the following third party libraries to decode the various ways DICOM images are compressed:

  1. OpenJPEG.js for JPEG2000 images. Based on the OpenJPEG library

  2. OHIF/image-JPEG2000 For JPEG2000 Images. Based on the PDF.js library

  3. CharLS.js for JPEG-LS images. Based on the CharLS library

  4. JPEGLossless Decoder JS for JPEG Lossless images.

  5. JPEG Lossy for JPEG Lossy images. Based on notmasteryet with changes contributed by gSquared

  6. pako.js for deflate based images.

JPEG2000

The OpenJPEG based codec is the default codec for JPEG2000 images. This codec is the default because the OpenJPEG library is in wide use, activily supported and believed to be able to decode most of if not all JPEG2000 images found in medical imaging. The PDF.js library is not recommended as it has known issues that nobody is fixing and not actively supported. The performance of the PDF.js library may be better on some browsers or with some types of images, here are some benchmarks:

Images from ftp://medical.nema.org/MEDICAL/Dicom/DataSets/WG04/compsamples_j2k.tar

iMac Retina 5k Late 2014 4GHz Intel Core i7 Chrome 50.0.2661.102 (64 bit)

Image OpenJPEG PDF.js
NM1_J2KR 233 ms 103 ms
CT1_J2KR 424 ms 147 ms
RG1_J2KR 6058 ms 2311 ms
MG1_J2KR 19312 ms 7380 ms

iMac Retina 5k Late 2014 4GHz Intel Core i7 FireFox 46.0.1

Image OpenJPEG PDF.js
NM1_J2KR 240 ms 102 ms
CT1_J2KR 185 ms 91 ms
RG1_J2KR 3445 ms 1594 ms
MG1_J2KR 10295 ms 14207 ms

iMac Retina 5k Late 2014 4GHz Intel Core i7 Safari 9.1.1

Image OpenJPEG PDF.js
NM1_J2KR 64 ms 56 ms
CT1_J2KR 115 ms 94 ms
RG1_J2KR 2367 ms 1567 ms
MG1_J2KR 6496 ms 18547 ms