Questions tagged [real-analysis]

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Mirrored spectrum after computing derivatives of 2D function in Fourier domain

I use FFTW library to compute gradients and divergences of my function by the relation $\nabla_\vec x = i \vec k $. I use the transformation functions for the real signal to save the memory and indeed ...
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Signals in real world?especially natural signals?

Do all the signals in real world ,that are of interest in engineering(for measurements or processing)are only continous/analog or there any other alternatives also? For example birds make voice,...
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Understanding the Probability Distribution of Intensity Values

From "Digital Image Processing 4th ed. - Gonzalez, Woods" Let $p_r(r)$ and $p_s(s)$ denote the PDFs of intensity values $r$ and $s$ in two different images. A fundamental result from probability ...