Open source implementation of High-throughput JPEG2000 (HTJ2K), also known as JPH, JPEG2000 Part 15, ISO/IEC 15444-15, and ITU-T T.814. Here, we are interested in implementing the HTJ2K only, supporting features that are defined in JPEG2000 Part 1 (for example, for wavelet transform, only reversible 5/3 and irreversible 9/7 are supported).
The interested reader is referred to the short HTJ2K white paper, or the extended HTJ2K white paper for more details on HTJ2K. This paper explores the attainable performance on CPU, while this and this explores performance on the GPU.
The standard is available free of charge from ITU website. It can also be purchased from the ISO website.