pnmtofiasco - Convert PNM file to FIASCO compressed file
pnmtofiasco [option]... [filename]...
pnmtofiasco compresses the named pbm, pgm, or ppm image files, or Standard Input if no
file is named, and produces a FIASCO file on Standard Output.
All option names may be abbreviated; for example, --optimize may be written --optim or
--opt. For most options a one letter short option is provided. Mandatory or optional
arguments to long options are mandatory or optional for short options, too. Both short
and long options are case sensitive.
The basic options are:
-i name, --input-name=name
Compress the named images, not Standard Input. If name is -, read Standard Input.
name has to be either an image filename or a template of the form:
Templates are useful when compressing video streams: e.g., if you specify the tem-
plate img0[12-01-2].pgm, then pnmtofiasco compresses the images img012.pgm,
img010.pgm, ..., img002.pgm.
If name is a relative path, pnmtofiasco searches for the image files in the current
directory and in the (colon-separated) list of directories given by the environment
-o output-file, --output-name=name
Write FIASCO output to the named file, not to Standard Output.
If name is a relative path and the environment variable FIASCO_DATA is a (colon-
separated) list of directories, then pnmtofiasco writes the output file to the
first (writable) directory of this list. Otherwise, pnmtofiasco write it to the
-q N, --quality=N
Set quality of compression to N. Quality is 1 (worst) to 100 (best); default is
Print pnmtofiasco version number, then exit.
-V N, --verbose N
Set level of verbosity to N. Level is 0 (no output at all), 1 (show progress
meter), or 2 (show detailed compression statistics); default is 1.
-B N, --progress-meter N
Set type of progress-meter to N. The following types are available; default is 1:
0: no progress meter
1: RPM style progress bar using 50 hash marks
2: percentage meter
-f name, --config=name
Load parameter file name to initialize the options of pnmtofiasco. See file sys-
tem.fiascorc for an example of the syntax. Options of pnmtofiasco are set by any of
the following methods (in the specified order):
1) Global ressource file /etc/system.fiascorc
3) command line
Print brief help, then exit.
Print detailed help, then exit.
The options for advanced users are:
-b name, --basis-name=name
Preload compression basis name into FIASCO. The basis name provides the initial
compression dictionary. Either use one of the files "small.fco", "medium.fco", or
"large.fco" that come with pnmtofiasco or create a new ASCII basis file.
-z N, --optimize=N Set optimization level to
N. Level is 0 (fastes) to 3 (slowest); default is 1. Be warned, the encoding time
dramatically increased when N=2 or N=3 while the compression performance only
Use additional predictive coding. If this optimization is enabled then the image is
compressed in two steps. In the first step, a coarse approximation of the image is
computed using large unichrome blocks. Finally, the delta image is computed and the
prediction error is approximated using the standard FIASCO algorithm.
-D N, --dictionary-size=N
Set size of dictionary that is used when coding the luminance band to N; default is
10000, i.e., the dictionary is not restricted.
-C N, --chroma-dictionary=N
Set size of dictionary that is used when coding chroma bands to N; default is 40.
-Q N, --chroma-qfactor=N
Reduce the quality of chroma band compression N-times with respect to the user
defined quality q of the luminance band compression (--quality=q); default is 2.
-t N, --tiling-exponent=N
Subdivide the image into 2^N tiles prior coding; default is 4, i.e. the image is
subdivided into 16 tiles. The processing order of the individual tiles is defined
by the option --tiling-method=name.
-T name, --tiling-method=name
Order the individual image tiles (the image is subdivided into; see option
--tiling-exponent=N) by method name; default is "desc-variance".
desc-variance: Tiles with small variances are processed first.
asc-variance: Tiles with large variances are processed first.
desc-spiral: Tiles are process in spiral order starting in the middle.
asc-spiral: Tiles are process in spiral order starting at the border.
Use N mantissa bits for quantized coefficients.
Use N mantissa bits for quantized DC coefficients.
Coefficients outside the quantization interval [-N,+N] are set to zero.
DC coefficients outside the quantization interval [-N,+N] are set to zero.
Additional options for video compression are:
-s N, --smooth=N
Smooth decompressed reference frames along the partitioning borders by the given
amount N. N is 0 (no smoothing) to 100; default is 70. This factor is stored in the
-m N, --min-level=N
Start prediction (motion compensated prediction or additional prediction) on block
level N; default is level 6. I.e., motion compensation is applied to all image
blocks of at least 8x8 pixels (binary tree level N=6), 16x8 (N=7), 16x16 (N=8),
-M N, --max-level=N
Stop prediction (motion compensated prediction or additional prediction) on block
level N; default is level 10. I.e., motion compensation is applied to all image
blocks of at most 16x16 pixels (N=8), 32x16 (N=9), 32x32 (N=10), etc.
Use half pixel precise motion compensation.
-F N, --fps=N
Set number of frames per second to N. This value is stored in the FIASCO output
file and is used in the decoder dfiasco(1) to control the framerate.
-p type, --pattern=type
Defines the type of inter frame compression which should be applied to individual
frames of a video stream. type is a sequence of characters; default is
"IPPPPPPPPP". Element N defines the type of predicting which should be used for
frame N; the frame type pattern is periodically extended. Valid characters are:
I: intra frame, i.e., no motion compensated prediction is used at all.
P: predicted frame, i.e., a previously encoded frame is used for prediction (for-
B: bidirectional predicted frame, i.e., not only a previously shown frame but also
a frame of the future is used for prediction (forward, backward or interpolated
Instead of using exhaustive search the "Cross-B-Search" algorithm is used to find
the best interpolated prediction of B-frames.
Also use previously encoded B-frames when prediction the current frame. If this
option is not set, only I- and P-frames are used to predict the current frame.
pnmtofiasco < foo.ppm >foo.wfa
Compress the still image "foo.ppm" to the FIASCO file "foo.wfa" using the default
pnmtofiasco -2 -p "IBBPBBPBB" -fps 15 -o video.wfa foo0*.ppm
Compress the video frames "foo0*.ppm" to the FIASCO file "video.wfa" using half
pixel precise motion compensation at a frame rate of 15 frames per second. Intra
frame 1 is used to predict P-frame 4, frames 1 and 4 are used to predict B-frames 2
and 3, and so on. Frame 10 is again an intra-frame.
The systemwide initialization file.
The personal initialization file.
Search path for image files. Default is "./".
Search and save path for FIASCO files. Default is "./".
fiascotopnm(1), ppmtojpeg(1), pnmtojbig(1), ppmtogif(1), pnm(5)
Ullrich Hafner, Juergen Albert, Stefan Frank, and Michael Unger. Weighted Finite Automata
for Video Compression, IEEE Journal on Selected Areas In Communications, January 1998
Ullrich Hafner. Low Bit-Rate Image and Video Coding with Weighted Finite Automata, Ph.D.
thesis, Mensch & Buch Verlag, ISBN 3-89820-002-7, October 1999.
Ullrich Hafner <firstname.lastname@example.org>
July 12, 2000 pnmmtofiasco(1)