openjpeg/applications/jpip/README

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                    OpenJPIP software 2.1 ReadMe

OpenJPEG:
http://www.openjpeg.org

Written by:
Kaori Hagihara
UCL/SST/ICTM/ELEN
February 18 2011
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Contents:
1. Introduction
2. License
3. System requirements
4. Implementing instructions
5. JP2 encoding instructions


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1. Introduction
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OpenJPIP software is an implementation of JPEG 2000 Part9: Interactivity tools, APIs and protocols (JPIP).
( For more info about JPIP, check the website: http://www.jpeg.org/jpeg2000/j2kpart9.html)
The current implementation uses some results from the 2KAN project (http://www.2kan.org).

Version 2.1 covers:
 - JPT-stream (Tile) and JPP-stream (Precinct) media types
 - Session, channels, cache model managements
 - JPIP over HTTP, HTTP requests and TCP return
 - Indexing JPEG 2000 files
 - Embedding XML formatted metadata
 - Region Of Interest (ROI) requests
 - Access to JP2 files with their URL

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2. License
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This software is released under the BSD license, anybody can use or modify the library, even for commercial applications.
The only restriction is to retain the copyright in the sources or the binaries documentation.
Neither the author, nor the university accept any responsibility for any kind of error or data loss which may occur during usage.

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3. System requirements
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 - FastCGI development kit (C libraries) at server (http://www.fastcgi.com)
 - libcURL library
 - Java application launcher at client
<Optional>
 - Xerces2 java XML parser on the client for accessing embedded image metadata (http://xerces.apache.org/xerces2-j)

We tested this software with a virtual server running on the same Linux machine as the clients.

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4. Building instructions
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A Makefile is available in the same directory as this README file. Simply type 'make' and it will build all the required C-executables.
Concerning the java-based opj_viewer, simply type 'ant' in the corresponding directory (requires 'ant' utility of course)

The documentation can be build this way (requires doxygen utility):
  cd doc
  doxygen Doxyfile

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5. Usage
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Preliminary notes : 
  * HTML documentation is available at http://www.openjpeg.org/jpip/doc/html
  * Example image is available at http://www.openjpeg.org/jpip/data/copenhague1.zip (20 Mb !)

Webserver: 
  You need a webserver running with the fastcgi module enabled and correctly configured. 
  For Apache, add the following line to your /etc/apache2/mods-available/fastcgi.conf configuration file:
  
      FastCGIExternalServer /var/www/myFCGI -host localhost:3000
  
  where /var/www is your DocumentRoot. 
  Please refer to 'http://www.openjpeg.org/jpip/doc/ApacheFastCGITutorial.pdf' for more details.

Server:
 1. Store JP2 files in the same directory as opj_server

 2. Launch opj_server from the server terminal:
    % spawn-fcgi -f ./opj_server -p 3000 -n
 
 For shutting down JPIP server:
     %GET http://hostname/myFCGI?quitJPIP
     Notice, http://hostname/myFCGI is the HTTP server URI (myFCGI refers to opj_server by the server setting)
     Requst message "quitJPIP" can be changed in Makfile, modify -DQUIT_SIGNAL=\"quitJPIP\"

Client:
 1. Launch image decoding server, and keep it alive as long as image viewers are open
    % ./opj_dec_server [portnumber (50000 by default)]

    You might prefer to implement this program from another directory since cache files are saved in the working directory.
    % mkdir cache
    % cd cache
    % ../opj_dec_server

 2. Open image viewers (as many as needed)
    % java -jar opj_viewer.jar http://hostname/myFCGI path/filename.jp2 [hostname] [portnumber] [stateless/session] [jptstream/jppstream] [tcp/udp]
    ( The arguments 
      - http://hostname/myFCGI is the HTTP server URI (myFCGI refers to opj_server by the server setting)
      - path/filename.jp2 is the server local path or URL of a JP2 file
      - host name of opj_dec_server, localhost by default
      - portnumber of opj_dec_server, 50000 by default
      - request type stateless for no caching, session (default) for caching
      - return media type, JPT-stream tile based stream, or JPP-stream (default) precinct based stream
      - auxiliary return protocol, tcp or udp (udp is not implemented yet), if not given, return data is filled in http chunk
    Image viewer GUI instructions:
      Scale up request: Enlarge the window
      ROI request:      Select a region by mouse click and drag, then click inside the red frame of the selected region
    <If Xerces2 is installed>
    % java -jar opj_viewer_xerces.jar http://hostname/myFCGI JP2_filename.jp2
      Annotate image with ROI information in XML metadata: Click button "Region Of Interest"
      Open a new window presenting an aligned image with a locally stored image: Click button "Image Registration" (Under Construction)

 3. Quit the image decoding server through the telnet, be sure all image viewers are closed
    % telnet localhost 50000
      quit

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5. JP2 encoding instructions
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An example to encode a TIF image "copenhague1.tif" at resolution 4780x4050, 8bit/pixel, grayscale.
   % ./image_to_j2k -i copenhague1.tif -o copenhague1.jp2 -p RPCL -c [64,64] -t 640,480 -jpip -TP R

 options
  -jpip : embed index table box into the output JP2 file (obligation for JPIP)
  -TP R : partition a tile into tile parts of different resolution levels (obligation for JPT-stream)

<Option>
 3. Embed metadata into JP2 file
    % ./addXMLinJP2 copenhague1.jp2 copenhague1.xml
    Input metadata file "copenhague1.xml" looks like:
    <xmlbox>
      <roi name="island" x="1890" y="1950" w="770" h="310"/>
      <roi name="ship" x="750" y="330" w="100" h="60"/>
      <roi name="airport" x="650" y="1800" w="650" h="800"/>
      <roi name="harbor" x="4200" y="1650" w="130" h="130"/>
      <irt refimg="name1.jp2" m1="0.50" m2="-0.50" m3="0" m4="0.80" m5="-0.80" m6="0" m7="500" m8="1000" m9="0"/>
    </xmlbox>