CyberMen
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Help understanding Hough transform
Accepted answer
11 votes

Firstly, Matlab has a Built in Hough Transform: no need to reinvent the wheel. [H,T,R] = hough(BW,'RhoResolution',0.5,'Theta',-90:0.5:89.5); Although your image doesn't necessarily require edge ...

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Smoothing signal / detecting bumps in a data stream
6 votes

Effects of Averaging Using a moving average filter will smooth out the irregularities in the signal. The noise becomes E/N where N is the length of the moving average filter. The side effect of ...

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How to Resample Audio Using FFT or DFT
5 votes

While the above answer is really complete: Here is the gist of it: to downsample a signal it needs to be a whole number. Before the down sampling of a signal, you need to FILTER the signal. you can ...

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How to measure a detector's performance under extremely complex real-world environment?
5 votes

on an ROC curve your plotting FP(x-axis) vs TP(y-axis) They are calculated by: True-positives = # of correctly detected positives/# of actual positives False-Positives = # of positives that are ...

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FFT window phase syncronising
4 votes

Here are a few things that aren't right: 1) Regardless of the Carrier Synchronization: You are using 0 and 90 degrees for your signaling. You would need an I and Q channel in order to decode the ...

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survey/book on adaptive/self-tuning of PI controllers?
2 votes

Typically Self tuning controllers are done in the digital domain. You may want to look into Least Squares Method for controller tuning.

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What is the "waterbed effect" in control system design?
2 votes

If I am understanding this paper please correct me if I am wrong: A common effect, usually associated with unstable zeroes and poles of the open loop plant, makes it theoretically impossible to make ...

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How to get coefficients for sine/cosine function from complex FFT?
2 votes

This is a no brainer for anyone who's studied signal processing (Im wondering why its been so long since its been answered) The Fourier Transform itself is a function that tells you what sinusoid do ...

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Calculate Phase angle between two signals i.e. digital Phase meter
2 votes

It sounds like the OP is looking to align two signals. One simple way of caluclating this is to do something similar to the cross Corr: 1) Mark the left or right channel as the Reference channel 2)...

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Beat detection in Matlab or Python
1 votes

The area you're asking about is called "Onset Detection" this is used all throughout signal processing, but most oven used in Music Information Retrieval to identify the start and stop to notes. ...

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How can I use the fourier transform of a sequence of x-ray scan images to segment it?
1 votes

If I am understanding what you're asking for, you're looking for an algorithm that uses the FT for image segmentation. 1) the FT will tell you where in your image is there a high frequency ...

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change the frequency component of a spectrum in an audio file
1 votes

Here is another solution: Assuming these are flat bands, calculate the center frequency of the band you would like to move to. multiply the band you would like to move down by cos(2*pi*centerFreq + ...

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How to Remove Gaussian Noise from an Image without Destroying the Edges?
1 votes

While every signal processing challenge there is no one fits all solution here is an idea: since you are trying to preserve the edges find out where they are in the image. Use a canny edge detector ...

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