Questions tagged [difference-of-gaussians]

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1answer
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How do I scale Gaussians for Edge detection

Say I have an $m\times n$ image and I want to use DOG for edge detection. I can see in this answer he is using: ...
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1answer
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Capacity loss of fast fading regarding AWGN

The theoric capacity of fast fading channel is: $$ C_{\rm fading}=E\left\{\log\left(1+\lvert h \rvert^2\textrm{SNR}\right)\right\}, \quad\text{with $E$ is expectance operator.}$$ At high SNR: $$\...
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0answers
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Gaussian Pyramid - Expand Operator

I'm trying to understand the EXPAND operator in Burt and Adelson's paper (https://s3.amazonaws.com/content.udacity-data.com/courses/ud810/readings/Burt-Adelson1983Laplacian-Pyramid.pdf) and I'm a bit ...
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2answers
237 views

Ramp function as derivative in frequency domain?

It is said that to get Laplacian of Gaussian in frequency domain, we may multiply the Fourier transform of Gaussian with two differentiating ramp function (1 ramp gives 1 order of derivative). The ...
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1answer
490 views

Which image for DoG filter?

I am studying computer vision and have some trouble with difference of Gaussian filter. We apply Gaussian filters with different values of sigma on original image then subtracting from them. However,...