On Sat, Feb 27, 2021 at 1:18 PM Kurt Schwehr <schw...@gmail.com> wrote:
> I can't touch grok... GNU Affero General Public License > No problem, this driver will be optional. The current commercial and open source drivers are quite good. > > On Sat, Feb 27, 2021, 9:50 AM Aaron Boxer <boxe...@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 >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> https://lists.osgeo.org/mailman/listinfo/gdal-dev >> >
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