[gdal-dev] New JPEG 2000 Driver

[Kurt Schwehr]

I can't touch grok... GNU Affero General Public License

On Sat, Feb 27, 2021, 9:50 AM Aaron Boxer <boxerab at gmail.com> wrote:

>  Hello Everyone,
>
> For those who aren’t aware, there is a pending PR for a new open source
> JPEG 2000 driver, based on the Grok JPEG 2000 library
>
> https://github.com/OSGeo/gdal/pull/3449
>
> Notable Library Features:
>
> 1. support for reading TLM and PLT markers, for fast random access into
> large tiled or single-tiled images
>
> 2. support for memory mapped files, which helps speed up random access
> decode for large images
>
> 3. internal tile cache that allows efficient reading of multiple tiles
> from single Grok codec object
>
> 4. support for new Part 15 of the JPEG 2000 standard (HTJ2K) which
> promises up to **10x** speedup
>
> of encode and decode
>
>
> Benchmarks:
>
> I haven't done a thorough comparison between Kakadu, Grok and OpenjPEG,
> but here are a few results (more details in PR)
>
> 1. Compression: multi-tile
>
> Kakadu is 2X faster than Grok; Grok is 5X faster than OpenJPEG
>
> 2. Decompression: large single tile image with PLT markers
>
> Kakadu is 60% faster than Grok; Grok is 2.5x faster than OpenJPEG
>
> 3. Decompression: 4000x4000 sub-region of large single tile image with PLT
> markers
>
> Kakadu is 40% faster than Grok; Grok is 5X faster than OpenJPEG
>
>
> This year should see Grok reaching performance parity with Kakadu.
>
>
> There is an RFC for the new driver, which is complete, and tested on a few
> compression and decompression work flows.
>
>
> Any comments or feedback is very welcome.
>
>
> Cheers,
>
> Aaron
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>
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