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SSTV Tools by VE3NEA

A set of troubleshooting and research tools for the SSTV enthusiasts.
For Windows 95/98/ME/NT4/2000/XP/7

SSTV Signal Generator

What it is
This program generates SSTV audio signals from a bitmap and saves them in a WAV or MMV file. Multiple SSTV formats and sampling rates are supported. The software can generate either a clean signal suitable for transmission, or a signal contaminated with noise, suffering from QSB, etc. - much like in Morse Runner, but with all effects carefully calibrated and measured in dB, Hz, and ms.

What it is good for

Create pre-canned SSTV messages, such as "CQ" or "73 DE", and transmit them without any SSTV software, just by playing the audio back in a media player.
Test your SSTV receiving software and see how tolerant it is to the noise, soundcard calibraion errors, receiver frequency offset, etc. Compare different receiving programs quantitatively.

SSTV Tools VE3NEA

SSTV Signal Viewer

What it is
This program demodulates FM signals from a WAV or MMV file and plots the frequency and magnitude vs. time. It is an extension of the original idea by OK2MNM, implemented with GUI and using a better FM demodulator based on Hilbert transform.

What it is good for
You can use it to view both the files generated by your SSTV program and the ones recorded off the air. Find out what exactly your signal consists of, how accurately it is generated, see how the FSK ID is encoded, discover the parameters of an unknown format, etc.

SSTV Signal viewer. VE3NEA

SSTV Image Denoiser

What it is
This program removes noise from the pictures. The denoising algorithm is specifically optimized for the SSTV images received off the air. Unlike other noise filters used in SSTV software, this one does nor blur the image, and preserves as much fine detail as possible.

What it is good for
Clean up your archive of SSTV pictures, prepare received images for publishing on the web.

How to use it

Click on the Load Image button, and select the image that will be denoised.
Select the filter order and smoothness parameter. The default order of 3 and smoothness of 0.4 are a good start.
Click on the Denoise Image button.
Play with the filter settings and find the parameters that work best for the given image.
Click on the Save Image button to save the denoised image.

For best results, configure your SSTV software to save received pictures as BMP. Though the Denoiser can load and save BMP, PNG, JPG and GIF images, it works best on the uncompressed BMP files. Images compressed with a lossy algorithm, such as JPG, may look great, but they do not contain all information required for denoising.

SSTV Image Denoiser

Below are some examples of before and after Image Denoiser

Before After

All 3 program info with download links HERE