DSP tutorial: SSTV decoding with slant correction

This improved SSTV decoder corrects slant using the Hough transform. I’ve put a moving average lowpass filter before the FM demodulator part to reduce noise, as you can see, this helps a lot:

MMSSTV’s image is on the right. The lowpass filters reduce noise but they keep the details. Here’s a video of my app and MMSSTV decoding a distorted signal:

Resources

Slant correction using the Hough transform
SSTV signal generator

Open source SSTV apps:

qsstv
slowrx

Source code

download (mirror2) (4.9 mb, 376 dls, today: 0)

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Nonoo
I'm Nonoo. This is my blog about music, sounds, filmmaking, amateur radio, computers, programming, electronics and other things I'm obsessed with. ... »

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