forked from KolibriOS/kolibrios
137 lines
5.8 KiB
Plaintext
137 lines
5.8 KiB
Plaintext
===============================================================================
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JPEG2000 Part 11 (ISO/IEC 15444-11 JPWL) Software
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Version 20061213
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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 JPWL module in the framework of OpenJPEG library.
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This implementation has been developed from OpenJPEG implementation of JPEG2000 standard, and for this reason it is written in C language.
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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 code
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==========================
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The JPWL code is integrated with the standard OpenJPEG library and codecs: it is activated by setting the macro USE_JPWL to defined in the preprocessor configuration options of your preferred C compiler.
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2.1. Compiling the source code in Windows
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-------------------------------------------
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The "jpwl" directory is already populated with a couple of Visual C++ 6.0 workspaces
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* JPWL_image_to_j2k.dsw - Creates the encoder with JPWL functionalities
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* JPWL_j2k_to_image.dsw - Creates the decoder with JPWL functionalities
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2.2. Compiling the source code in Unix-like systems
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-----------------------------------------------------
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Under linux, enter the jpwl directory and type "make clean" and "make".
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3. Running the JPWL software
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=========================
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The options available at the command line are exactly the same of the base OpenJPEG codecs. In addition, there is a "-W" switch that activates JPWL functionalities.
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3.1. JPWL Encoder
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-------------------
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-W : adoption of JPWL (Part 11) capabilities (-W params)
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The parameters can be written and repeated in any order:
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[h<tile><=type>,s<tile><=method>,a=<addr>,z=<size>,g=<range>,...
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...,p<tile:pack><=type>]
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h selects the header error protection (EPB): 'type' can be
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[0=none 1,absent=predefined 16=CRC-16 32=CRC-32 37-128=RS]
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if 'tile' is absent, it applies to main and tile headers
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if 'tile' is present, it applies from that tile
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onwards, up to the next h<tile> spec, or to the last tile
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in the codestream (max. 16 specs)
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p selects the packet error protection (EEP/UEP with EPBs)
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to be applied to raw data: 'type' can be
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[0=none 1,absent=predefined 16=CRC-16 32=CRC-32 37-128=RS]
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if 'tile:pack' is absent, it starts from tile 0, packet 0
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if 'tile:pack' is present, it applies from that tile
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and that packet onwards, up to the next packet spec
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or to the last packet in the last tile in the codestream
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(max. 16 specs)
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s enables sensitivity data insertion (ESD): 'method' can be
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[-1=NO ESD 0=RELATIVE ERROR 1=MSE 2=MSE REDUCTION 3=PSNR
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4=PSNR INCREMENT 5=MAXERR 6=TSE 7=RESERVED]
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if 'tile' is absent, it applies to main header only
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if 'tile' is present, it applies from that tile
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onwards, up to the next s<tile> spec, or to the last tile
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in the codestream (max. 16 specs)
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g determines the addressing mode: <range> can be
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[0=PACKET 1=BYTE RANGE 2=PACKET RANGE]
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a determines the size of data addressing: <addr> can be
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2/4 bytes (small/large codestreams). If not set, auto-mode
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z determines the size of sensitivity values: <size> can be
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1/2 bytes, for the transformed pseudo-floating point value
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ex.:
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h,h0=64,h3=16,h5=32,p0=78,p0:24=56,p1,p3:0=0,p3:20=32,s=0,s0=6,s3=-1,a=0,g=1,z=1
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means
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predefined EPB in MH, rs(64,32) from TPH 0 to TPH 2,
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CRC-16 in TPH 3 and TPH 4, CRC-32 in remaining TPHs,
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UEP rs(78,32) for packets 0 to 23 of tile 0,
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UEP rs(56,32) for packets 24 to the last of tile 0,
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UEP rs default for packets of tile 1,
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no UEP for packets 0 to 19 of tile 3,
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UEP CRC-32 for packets 20 of tile 3 to last tile,
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relative sensitivity ESD for MH,
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TSE ESD from TPH 0 to TPH 2, byte range with automatic
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size of addresses and 1 byte for each sensitivity value
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ex.:
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h,s,p
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means
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default protection to headers (MH and TPHs) as well as
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data packets, one ESD in MH
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N.B.: use the following recommendations when specifying
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the JPWL parameters list
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- when you use UEP, always pair the 'p' option with 'h'
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3.2. JPWL Decoder
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-------------------
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-W <options>
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Activates the JPWL correction capability, if the codestream complies.
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Options can be a comma separated list of <param=val> tokens:
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c, c=numcomps
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numcomps is the number of expected components in the codestream
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(search of first EPB rely upon this, default is 3)
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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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* It is not possible to save a JPWL encoded codestream using the wrapped file format (i.e. JP2): only raw file format (i.e. J2K) is working
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4.2. Limitations
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------------------
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* When specifying an UEP protection, you need to activate even TPH protection for those tiles where there is a protection of the packets
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* RED insertion is not currently implemented at the decoder
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* JPWL at entropy coding level is not implemented
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