Questions tagged [difference-of-gaussians]

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What does a sketch of difference of gaussians convolved on an image look like for different value of sigma?

What happens when I convolve an image $I(x,y)$ defined by the table below, with a $DoG = G(\sigma^{2}) - G(\sigma^2*{k^2})$ where $k^2=2$? What would be a sketch of $\sigma^{2}$ (on the x-axis) and ...
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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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147 views

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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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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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,...