Package Exports

jpeg-lossless-decoder-js
jpeg-lossless-decoder-js/release/cjs/lossless.cjs
jpeg-lossless-decoder-js/release/lossless.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (jpeg-lossless-decoder-js) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

JPEGLosslessDecoderJS

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

API and more examples

var decoder = new jpeg.lossless.Decoder();
var output = decoder.decompress(buffer [, offset [, length]]);

// Parameters
// {ArrayBuffer} buffer
// {Number} offset offset into buffer (default = 0)
// {Number} length length of buffer (default = end of JPEG block)

// Returns
// {ArrayBuffer} output (size = cols * rows * bytesPerComponent * numComponents)

Install

Get a packaged source file from the release folder:

Or install via NPM:

npm install jpeg-lossless-decoder-js

Testing

npm test

Building

npm run build

This will output lossless.js and lossless-min.js alongside declaration files and source maps to /release.

Acknowledgments

This decoder was originally written by Helmut Dersch for Java. I added support for selection values 2 through 7, contributed bug fixes and ported to JavaScript.

Also thanks to @jens-ox for modernizing this package to TypeScript.