Hi Jukka,
> I would like to see something that is open source and fast with JPEG2000. I > think that it would be OK to support only a subset of JPEG2000 standard if > the basic operations would be super fast. I took just a moment ago some > timings for another purpose but they may be interesting. I converted the > same 12000x12000 pixel image (432 MB uncompressed) with a few different > methods: > > GDAL (64-bit) from tiff to tiff: 3 seconds > GDAL (64-bit) ECWJP2 (SDK 5.0) from lossless JPEG2000 to tiff: 21 seconds > GDAL (64-bit) JP2KAK (SDK 7.3.2) from lossless JPEG2000 to tiff: 14 seconds > Kakadu 7.3.2 (64-bit) kdu_expand from lossless JPEG2000 to tiff: 7 seconds. > > The new library with opencl should be at least as fast as ECWJP2 with GDAL > but the faster the better. > > Using GPGPU has a potential 10x to 20x speedup over CPU. My new library is progressing: now working on the CUDA to OPenCL conversion. > It is interesting to see that native Kakadu application was two times > faster > than GDAL with JP2KAK driver of the same Kakadu version. Of course the use > case is very simple. > I don't know enough about the GDAL drivers to comment on this, but it does seem odd. Aaron
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