# Tagged Questions

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### DFT/FFT: What did N stand for again? [migrated]

So if I have an image of the size: 1920×1080 and I want to apply a convolution filter of 3x3. What is N in this case?
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### Explanation of LidarBoost Algorithm?

I am trying to understand the LidarBoost algorithm as explained in this paper (PDF warning). My apologies if this isn't the appropriate exchange; I've posted in DSP, but I didn't get a response there, ...
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### Speedup prediction of rotating mask filter

I am trying to do the speed up analysis of the rotating mask filter (section 4.2.3). Let $N^2$ be the pixels in the image and let $m^2$ be the neighborhood of a given pixel, what I have for my ...
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### Flipping the kernel in 2D convolution?

SEE: http://www.songho.ca/dsp/convolution/convolution2d_example.html "First, flip the kernel, which is the shaded box, in both horizontal and vertical direction" Why do we need to flip the kernel in ...
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