@abasb75/jpeg-lossless-decoder
v2.1.2-a
Published
A JavaScript JPEG Lossless decoder.
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@abasb75/jpeg-lossless-decoder
@abasb75/jpeg-lossless-decoder is a build from @rii-mango/JPEGLosslessDecoderJS that work up 3x faster for some images in vite.
===== 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.