Thread Subject: Eliminate Signal crests

My input is a bit noisy, I wish to transform it in a more smooth one to avoid some errors. In the pict in blue is current signal, in red what it should be. How can I realize it?

http://i27.tinypic.com/2nk89w4.jpg

"Giacomo " <bigbig1982@hotmail.com> wrote in message <h4s0qk$3tj$1@fred.mathworks.com>...
> My input is a bit noisy, I wish to transform it in a more smooth one to avoid some errors. In the pict in blue is current signal, in red what it should be. How can I realize it?
>
> http://i27.tinypic.com/2nk89w4.jpg

Use smoothing and filtering methods like moving average, kernel smoothing, wavelet scaling approximation, just to name a few examples. Also if you look for low-pass filters and smoothing methods there are some already implemented into MATLAB.

Regards

Thomas

"Thomas " <meinl@iism.uni-karlsruhe.de> wrote in message <h4s25l$sui$1@fred.mathworks.com>...
> "Giacomo " <bigbig1982@hotmail.com> wrote in message <h4s0qk$3tj$1@fred.mathworks.com>...
> > My input is a bit noisy, I wish to transform it in a more smooth one to avoid some errors. In the pict in blue is current signal, in red what it should be. How can I realize it?
> >
> > http://i27.tinypic.com/2nk89w4.jpg
>
> Use smoothing and filtering methods like moving average, kernel smoothing, wavelet scaling approximation, just to name a few examples. Also if you look for low-pass filters and smoothing methods there are some already implemented into MATLAB.
>
> Regards
>
> Thomas

Thx for the reply Thomas, will it work even for real time plots like a sensor input?

"Giacomo " <bigbig1982@hotmail.com> wrote in message <h4s0qk$3tj$1@fred.mathworks.com>...
> My input is a bit noisy, I wish to transform it in a more smooth one to avoid some errors. In the pict in blue is current signal, in red what it should be. How can I realize it?
>
> http://i27.tinypic.com/2nk89w4.jpg

If you're very confident of the shape of your data, and you just need to detect the transition point, you might try the Ramer-Douglas-Peucker algorithm for simplifying curves: http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm .