[gdal-dev] New JPEG 2000 Driver

[Aaron Boxer]

 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20210227/36e80248/attachment.html>