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Home Posts tagged "FFT"

Tag: FFT

Enhancing Image Quality of Thermal Images (Seek)

As you may know, I recently bought the ”Seek Thermal Camera” for my smartphone. It works great, but the images I take are blurry and quite noisy. In this post I will try to sharpen …

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Matz September 29, 2015 - 1:16 pm September 29, 2015MATLAB convolution, FFT, Image Processing, matlab, noise 0

Smoothing a Halftone Photo using FFT

In this post I will show how to smooth a halftone image using the fast Fourier Transform (FFT). You can try this out yourself by downloading my Matlab code on the bottom of the article. …

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Matz August 8, 2015 - 11:13 pm August 28, 2015MATLAB FFT, filter, Image Processing 0

Faster Linear Convolution Using Careful Zero Padding

When computing a linear convolution between an image I and a kernel K, the convention is to use FFT, pad with zeroes (also called zero filling) and use the convolution theorem to do this efficiently. …

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Matz April 12, 2014 - 10:31 pm May 7, 2017MATLAB convolution, factor, FFT, matlab, padding, recursion 0

Fast Fourier Transform of a zero vector

This is a short post about FFT of zero vectors and as a result show why FFTW does not check if the argument is a zero vector. I could argue that zero vectors are a …

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Matz February 8, 2014 - 8:20 pm February 16, 2014MATLAB FFT, matlab, optimization 0

Faro Shuffle retention

This post is about faro shuffles. A Faro shuffle is a perfect riffle shuffle of two halves of a deck of cards so that each card from each half is interlaced perfectly. There are two …

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Matz January 10, 2014 - 3:00 pm January 20, 2015Magic, Programming faro shuffle, FFT, magic, matlab 0
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