[gdal-dev] Copy meta data from one JP2 to another JP2 C++

[Norman Barker]

A JP2 is just a JPEG2000 codestream with a JPEG2000 header, as soon as you
get to the SOC marker then you have all the metadata. Alternatively you
could use the JPX file format to store the metadata separately to the
codestream.

I probably wouldn't use GDAL for this task, just read the metadata until
you hit the SOC marker.


Norman

On Wed, Apr 15, 2015 at 1:46 PM, Dr. Joshua Jackson <josh at nside.io> wrote:

> I’m looking for a good solution to copy the image meta data from one JP2
> to another JP2 in C++.  I have a folder full of 4096x4096 JPEG2000 images
> that I am processing with OpenCV.  On some of them I create a copy of the
> image and do some manipulations to.  As expected the new image file is
> missing all the metadata.
>
> I have tried using CreateCopy() with the OpenJPEG library; and while this
> does work it takes a really long time per image ~40sec.  (My image
> manipulations take only ~10sec).
>
> Is there some way to use the GetGDALDataSet() on the source file and then
> call SetMetaData() on the destination file for each meta data item?  How
> would one iterate through the metadata items?
>
> Here is a sample GDALInfo printout for a source image:
>
> Driver: JP2OpenJPEG/JPEG-2000 driver based on OpenJPEG library
> Files: middle_mask.jp2
> Size is 4096, 4096
> Coordinate System is:
> GEOGCS["WGS 84",
>     DATUM["WGS_1984",
>         SPHEROID["WGS 84",6378137,298.257223563,
>             AUTHORITY["EPSG","7030"]],
>         AUTHORITY["EPSG","6326"]],
>     PRIMEM["Greenwich",0],
>     UNIT["degree",0.0174532925199433],
>     AUTHORITY["EPSG","4326"]]
> Origin = (-96.965332031250000,32.464599609375000)
> Pixel Size = (0.000001341104507,-0.000001341104507)
> Image Structure Metadata:
>   INTERLEAVE=PIXEL
> Corner Coordinates:
> Upper Left  ( -96.9653320,  32.4645996) ( 96d57'55.20"W, 32d27'52.56"N)
> Lower Left  ( -96.9653320,  32.4591064) ( 96d57'55.20"W, 32d27'32.78"N)
> Upper Right ( -96.9598389,  32.4645996) ( 96d57'35.42"W, 32d27'52.56"N)
> Lower Right ( -96.9598389,  32.4591064) ( 96d57'35.42"W, 32d27'32.78"N)
> Center      ( -96.9625854,  32.4618530) ( 96d57'45.31"W, 32d27'42.67"N)
> Band 1 Block=1024x1024 Type=Byte, ColorInterp=Red
>   Overviews: 2048x2048, 1024x1024, 512x512, 256x256
>   Overviews: arbitrary
> Band 2 Block=1024x1024 Type=Byte, ColorInterp=Green
>   Overviews: 2048x2048, 1024x1024, 512x512, 256x256
>   Overviews: arbitrary
> Band 3 Block=1024x1024 Type=Byte, ColorInterp=Blue
>   Overviews: 2048x2048, 1024x1024, 512x512, 256x256
>   Overviews: arbitrary
>
> Joshua Jackson, PhD
>
> Senior ResearchEngineer
>
> (800) 604-1822 Ext. 5109 <8006041822,5109>   (256) 648-5109 <2566485109>
>
> josh at nside.io   www.nSide.io
>
> <http://www.nside.io/> 4031 Parkway Dr, Suite B, Florence, AL 35630
>
>  <http://www.linkedin.com/company/nside/> <http://twitter.com/nSide__Out>
>
>
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