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# Tag Info

### Curve Fit of Step Function with Boundary on the 2nd Derivative

Hmmmmmmmmm, interesting question. Since you want to use the second derivative as your criteria, it would seem that you would want to have the maximum second derivative absolutie value for as short of ...
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### Derivative with respect to complex conjugate

That's a trick which you will also find in a DSP context, that's why I choose to provide an answer here. It is related to the Wirtinger derivative, and you can find more details about it in this ...
• 90.4k

### Best Metric to Compare Sparsity of Vectors

I am sorry I cannot comment your answer due to my low reputation. Gini and your suggested sparsity ratio ($l_1(x)/l_2(x)$) both give me the same value for $\lambda$. But The problem I still see is ...
• 223

### Why Do Most of The Papers Use the Frobenius Norm for Denoising?

The Frobenius Norm has multiple equivalent definitions – the useful for error measure is probably this one: $$\left\|M\right\|_\mathrm F = \sqrt{\sum_{p\in M}\left\lvert p\right\rvert^2}$$ That's a ...
• 31.1k
Accepted

### Why use parametric based estimation methods - confusion regarding terms

Hi: I'll try to answer as briefly as possible and only with respect to statistics. not dsp. In statistics, if you have a nice pdf such as the normal distribution, then maximizing the likelihood is ...
• 1,117
Accepted

• 19.7k
Accepted

### Fastest Available Algorithm to Blur an Image (Low Pass Filter)

The fastest blur would be Box Blur. You can implement it using Running Sum. I think Intel FilterBoxBorder works in that manner. If you'd like you can do a few ...
• 19.7k

### Fastest Available Algorithm to Blur an Image (Low Pass Filter)

I have implemented a fast 5x5 Gaussian-blur in C++ and compared the performance to OpenCV on Raspberry Pi 3B+ running 32bit Raspbian OS. The function uses all the 4 cores of the Raspberry Pi and works ...
Accepted

### Why does it seem most of people will optimize the downlink rate,not the uplink rate?

This simply reflects the load asymmetry of real world applications. On most networks, traffic is dominated by content streaming, which is a download activity. Netflix alone accounts for 15% of the ...
• 45.4k