Improve support for region of interest

[GoogleCodeExporter]

It would be very useful to be able to specify a rectangular region of interest 
to be extracted when using j2k_to_image. This is especially useful when working 
with very large images where only small portions of the images are needed.

Original issue reported on code.google.com by keith.hu...@gmail.com on 15 Sep 2010 at 7:44

• Blocked on: Large single-tile image and memory: need low level streaming implementation #94

[GoogleCodeExporter]

Original comment by mathieu.malaterre on 29 May 2012 at 1:31

• Added labels: Milestone-Release2.0

[GoogleCodeExporter]

Original comment by mathieu.malaterre on 25 Feb 2014 at 2:20

• Changed title: Support for region of interest specification in opj_decompress
• Added labels: Priority-Low
• Removed labels: Milestone-Release2.0, Priority-Medium

[GoogleCodeExporter]

Original comment by mathieu.malaterre on 25 Feb 2014 at 3:42

[GoogleCodeExporter]

$ opj_decompress -h
[...]
  -d <x0,y0,x1,y1>
    OPTIONAL
    Decoding area
    By default all the image is decoded.

Original comment by mathieu.malaterre on 4 Mar 2014 at 2:50

• Changed state: Fixed
• Added labels: Milestone-Release2.1

[GoogleCodeExporter]

The decode area didn't take into account the case where the file is not tiled.
In this case all the image is decoded and only the decoded area is written in 
the output file.

Original comment by savmick...@gmail.com on 6 Mar 2014 at 11:39

• Changed state: Accepted

[GoogleCodeExporter]

Reformulating OP request. OpenJPEG should provide a low level functionality to 
decode only portion of the image based on precinct (case image is single tiled 
for example). Until issue 94 is solved, this cannot be fixed.

Original comment by mathieu.malaterre on 6 Mar 2014 at 11:50

• Changed title: Improve support for region of interest
• Removed labels: Milestone-Release2.1
• Now blocked on: Large single-tile image and memory: need low level streaming implementation #94