Slowrx is an SSTV decoder for Linux.

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README.md

slowrx

A shortwave listener's Linux tool for decoding analogue SSTV images received through the sound card. Aims for intuitive simplicity and lack of features not needed by the SWL.

Features

Support for a multitude of modes (see modespec.c for a list)
Detect frequency-shifted signals – no need to fine-tune the radio
Automatic slant correction (compensation for sound card clock error)
Adaptive noise reduction
FSK ID decoding
Save received pictures as PNG
Written in C

Requirements

Linux
Alsa
Gtk+ 3
FFTW 3
pnglite

And, obviously:

shortwave radio with SSB
computer with sound card
means of getting sound from one to the other

References

The program was inspired by several articles:

Barber, JL (N7CXI) (May 2000). "Proposal for SSTV Mode Specifications". Presented at the Dayton SSTV forum, 20 May 2000.
Cordesses L, Cordesses R (F2DC) (May 2003). "Some thoughts on 'Real-Time' SSTV Processing". QEX May/June 2003: 3–20.
Gasior M, Gonzalez J L (May 2004). "Improving FFT Frequency Measurement Resolution by Parabolic and Gaussian Spectrum Interpolation". AIP Conf. Proc. (Geneva: CERN) 732 (2004): 276–285.
Jones, D (KB4YZ) (Feb 1998). "List of SSTV Modes with VIS Codes".
Jones, D (KB4YZ) (May 1999). "List of SSTV Modes with Line Timing".

Licensing

Copyright (c) 2007-2011, windytan (OH2-250)

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.