100 lines
4.1 KiB
Plaintext
100 lines
4.1 KiB
Plaintext
===============================================================================
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JPEG2000 Visualization Software
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- OPJViewer
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Version 0.1 alpha
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===============================================================================
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1. Scope
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=============
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This document describes the installation and use of the OPJViewer in the framework of OpenJPEG library.
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This implementation has been developed using the OpenJPEG library as decoding engine and wxWidgets 2.8.0 as GUI engine.
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If you find some bugs or if you have problems using the encoder/decoder, please send an e-mail to jpwl@diei.unipg.it
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2. Installing the viewer
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==========================
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There are two available options, at the moment: a) compile from source code, and b) download a precompiled binary. In order to perform option a), it is mandatory to have compiled and built the LibOpenJPEG_JPWL library and the wxWidgets 2.8.0 framework (you have to download it from http://www.wxwidgets.org/ and compile the wx* libraries).
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2.1. Compiling the source code in Windows
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-------------------------------------------
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These are the steps required to compile the viewer under windows.
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a) Download at least the libonjpeg, jpwl, and opjviewer folders from the SVN trunk.
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b) Open the OPJViewer.dsw workspace with Visual C++ 6 and activate the "OPJViewer - Win32 Release" configuration.
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c) In the configuration settings, go to the C++ tab and modify the wxWidgets paths in order to reflect your wx* install configuration (Preprocessor -> Additional include directories): simply update each instance of the two wx paths, do not remove or add them.
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d) In the configuration settings, go to the Link tab and modify the wxWidgets path in order to reflect your wx* install configuration (Input -> Additional library path): simply update the wx path.
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e) In the configuration settings, go to the Resources tab and modify the wxWidgets path in order to reflect your wx* install configuration (Additional resource include directories): simply update the wx path.
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f) Build!
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g) Run!
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h) (OPTIONAL) Prepare an installer by compiling the InnoSetup script OPJViewer.iss (you need to download it from http://www.jrsoftware.org/isinfo.php).
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2.2. Compiling the source code in Unix-like systems
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-----------------------------------------------------
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The porting is possible and under way.
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3. General information on the viewer
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====================================
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This viewer is conceived to open and display information and image of J2K, JP2, and MJ2 files.
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The viewer application graphical interface is divided into three main panels:
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- a browsing pane;
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- a viewing pane;
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- a log/peek pane.
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The browsing pane will present the markers or boxes hierarchy, with position (byte number where marker/box starts and stops) and length information (i.e., inner length as signalled by marker/box and total length, with marker/box sign included), in the following form:
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filename
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|_ #000: Marker/Box short name (Hex code)
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| |_ *** Marker/Box long name ***
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| |_ startbyte > stopbyte, inner_length + marker/box sign length (total length)
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| |_ Additional info, depending on the marker/box type
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| |_ ...
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|_ #001: Marker/Box short name (Hex code)
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| |_ ...
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...
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The viewing pane will display the decoded image contained in the JPEG 2000 file.
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It should display correctly images as large as 4000x2000, provided that a couple of GB of RAM are available. Nothing is known about the display of larger sizes: let us know if you manage to get it working.
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The log/peek pane is shared among two different subpanels:
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- the log panel will report a lot of debugging info coming out from the wx GUI as well as from the openjpeg library
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- the peek pane tries to give a peek on the codestream/file portion which is currently selected in the browsing pane. It shows both hex and ascii values corresponding to the marker/box section.
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4. Known bugs and limitations
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===============================
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4.1. Bugs
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-----------
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*
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4.2. Limitations
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------------------
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* For mj2 files, only the first frame is displayed, and only in B/W
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* There is no zooming function
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