[gdal-dev] New JPEG 2000 Driver

[Aaron Boxer]

On Sat, Feb 27, 2021 at 1:18 PM Kurt Schwehr <schwehr at 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 <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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>> gdal-dev at lists.osgeo.org
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>>
>
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