fiasco(3) FIASCO fiasco(3)
Fractal Image And Sequence COdec Fractal Image And Sequence COdec
April, 2000
NAME
fiasco_coder - compress image files to a FIASCO file
SYNOPSIS
#include <fiasco.h>
int
fiasco_coder (char const * const * image_names,
const char * fiasco_name,
float quality,
const fiasco_c_options_t * options);
DESCRIPTION
The fiasco-coder() function compresses the image file(s) given by the
list of image_names and creates the new FIASCO output file
fiasco_name. Besides the approximation quality, several compression
parameters can be adjusted by the class options (see
fiasco_c_options_new(3)).
ARGUMENTS
image_names
NULL terminated array of image filenames to process. If the first
array element is "-" or a NULL pointer then FIASCO reads the
image from standard input. Each array element either has to be an
image filename or a template of the form:
prefix[start-end{+,-}step]suffix
Templates are useful when compressing video streams: e.g., if the
template "img0[12-01-2].pgm" is given as array element, then
FIASCO compresses the images img012.pgm, img010.pgm, ...,
img002.pgm (in this order).
If a filename is a relative path then the images are searched for
in the current directory and in the (colon-separated) list of
directories given by the environment variable FIASCO_IMAGES.
fiasco_name
Name of the FIASCO output file. If the name is "-" or NULL then
the file is produced on standard output.
If fiasco_name is a relative path and the environment variable
FIASCO_DATA is a (colon-separated) list of directories, then the
output file is written to the first (writable) directory of this
list. Otherwise, the current directory is used to store the
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fiasco(3) FIASCO fiasco(3)
Fractal Image And Sequence COdec Fractal Image And Sequence COdec
April, 2000
output file.
quality
Defines the quality of compression. Quality has to be a positive
value, its typical range is 1.0 (worst) to 100.0 (best). Larger
values are also allowed - at the cost of exploding encoding
times.
options
This "class" encapsulates the various coding and decoding
parameters. Use the functions fiasco_c_options_new(3) and
fiasco_c_options_delete(3) to create and delete an object of this
class. Several member functions (see fiasco_c_options(3)) are
available to change the default values.
RETURN VALUE
The function fiasco_coder() returns 1 if the FIASCO file has been
successfully written. If an error has been catched during compression,
0 is returned - use the function fiasco_get_error_message(3) to get
the last error message of FIASCO.
ENVIRONMENT
FIASCO_IMAGES
Search path for image files. Default is "./".
FIASCO_DATA
Search and save path for FIASCO files. Default is "./".
SEE ALSO
fiasco_c_options_new(3), fiasco_c_options_delete(3),
fiasco_c_options(3), fiasco_get_error_message(3)
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.
AUTHOR
Ullrich Hafner <hafner@bigfoot.de>
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