Steve on Image Processing

Concepts, algorithms & MATLAB

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Results for: Fourier transforms

FFT Stories

Posted by Steve Eddins,

My last meeting of the day ended just a little while ago, and I was starting to think seriously about figuring out a blog post for this week. What to write about? That's when I happened to see that Cleve posted just yesterday about the FFT. Ah ha! I'll write about that, too (in honor of National Blog About the FFT Week).... read more >>

Negative frequencies 10

Posted by Steve Eddins,

I recently asked for your advice about how to continue my Fourier transform series. I appreciate all the enthusiastic and helpful responses. I'd like to continue focusing on some basic points that confuse folks who don't have an extensive signal processing background: ... read more >>

No units in the DTFT 4

Posted by Steve Eddins,

OysterEngineer (I love that name!) asked some interesting questions in response to my last Fourier transform post, which concerned the relationship between the discrete-time Fourier transform (DTFT) and the discrete Fourier transform (DFT). ... read more >>

The DFT and the DTFT 8

Posted by Steve Eddins,

It's finally time to start looking at the relationship between the discrete Fourier transform (DFT) and the discrete-time Fourier transform (DTFT). Let's look at a simple rectangular pulse, for . The DTFT of is: ... read more >>