Algorithm is a method expressed in a finite list of steps of well-defined instructions to process a signal.

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Determining if an unknown signal has “converged” or become quasi-steady

Relevant background: I am trying to simulate unsteady flow in a converging-diverging nozzle, and trying to see how the flow shedding downstream of the nozzle affects the wall shear stress ...
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18 views

Sub-clock FPGA delays on output line

I am trying to include the ability to have sub-clock delays on an FPGA system's data bus without the need of fractional delay filters. I am using a Xilinx V6 part, and could utilize its IODELAYE1 ...
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31 views

“Quantifying” rotational acceleration from an accelerometer

I hope this post isn't too long, but I'm desperate for help and want to be pretty detailed/specific. I have recently built a system where a rod is attached at one end to a rotating shaft. So, as the ...
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5answers
75 views

Looking for an algorithm that computes “Similarity” between two signals

I'm new in this forum! ... and I'm not an expert in signal processing! ... So I hope to find help here:-) I was wondering if someone could point me to an algorithm/technique that is used to compare ...
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8 views

Placing cluster centers with S regular grid space

I started to working on MATLAB implemantation of following paper. http://www.kev-smith.com/papers/SMITH_TPAMI12.pdf At that paper I need to place K numbers of cluster centers on to a LAB spaced ...
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2answers
69 views

Image segmentation algorithm

I wonder if there are algorithms used to segment images efficiently. The ones I tested by now can not segment hair correctly as on this image: I just want to know if someone can give me some ...
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1answer
38 views

Fragmented recovered image using a Phase Retrieval Algorithm named Error-Reduction

After reading the paper Phase retrieval algorithms: a comparison by J.R.Fienup. I implemented the Error-Reduction Algorithm in MATLAB. The initial phase input was randomly generated, so the final ...
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3answers
49 views

Is there a algorithm for detecting bursts in signal?

Suppose we have a signal like that and we want to know when a burst have happened. Rigth now our approach is pretty straightforward. We measure std of signal at some time window and then with each new ...
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1answer
48 views

I have some questions about background subtraction with Gaussian Mixture Model (GMM)

I'm learning about Gaussian Mixture Model (GMM) for background subtraction.. And have some questions about it.. In Chris Stauffer paper "Adaptive background mixture models for real-time tracking" ...
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3answers
149 views

Get a N-FFT with two N/2-FFT already computed

After somme researchs on the web, I don't find the answer of my problem (or I don't understand it) and I hope this post will succeed. I'm working on a real-time FFT convolution algorithm (C++) which ...
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1answer
43 views

Preprocessing signal before LPC

I have a signal that contains the speaking of three vowels. The signal is contaminated with dc offset and an interference at 60 Hz. I want to perform LPC for the synthesis of the spoken vowels. Do I ...
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1answer
85 views

Algorithm to pan audio

I'm looking for a way to pan the PCM audio I have. At the moment the audio is in a stereo format and I would like to pan it to the desired side (or more/less to a side). I've recently figured out how ...
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3answers
161 views

Books/resources for implementing various mathematical functions in fixed point arithmetic for DSP purposes

I'm looking for books/resources out there that deal with, in detail, implementing mathematical functions - log/exponential/sine/cosine/inverse in fixed point arithmetic for DSP purposes. Looking for ...
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2answers
72 views

Is there a better Fourier Transform-based algorithm to use in Image recognition

I have been trying to use the Fourier transform in recognizing images of the same size 200x400. I have tried many different ways to do that such as: Performing the Fourier on the full image and ...
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43 views

How I can optimize the DFT become the FFT?

As title, I am trying to understand fast Fourier transform, but I have a little trouble, that is: The DFT said that we must multiply the matrix 2n x 2n with ...
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1answer
139 views

Duration of unknown rectangular pulse with additive white Gaussian noise

Problem. There is a discrete signal $f[i]$ (example below). It is known, that $f[i]$ have a form of rectangular pulse with additive white Gaussian noise. $f[i] = s[i] + n[i]$, $s[i] = ...
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23 views

How I can do multiple vehicle tracking with CAMShift?

I have a project to tracking multiple vehicle.. Here it's my explanation to do multiple tracking: After I find contour of all objects in all frame, I can find x,y,w,h.. Each (x,y,w,h) is used as ...
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1answer
34 views

Is my algorithm is right about blob tracking for vehicle tracking?

I'm doing vehicles tracking project.. The video is a one-way, no vehicles occlusion.. After do background subtraction, erode and dilate I get bounding box objects for each frame, and I can find ...
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2answers
107 views

Vowel detection using MFCC

Does anybody know a simple way to recognize vowels from MFCCs? (not words, just phonemes: a,e,i,o,u). I heard this is a vastly known problem in DSP with several solutions like SVM, GMM and cosine ...
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1answer
47 views

Legal issues when using a paper [closed]

I'm just curious about the copyright issues when publishing a paper on the Internet. Can some simply take the idea I explained in a manuscript and implement it for his own work? (e.g. using some ...
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1answer
33 views

Evaluation of incremental sensor

Evaluating a volume flow incremental sensor does not deliver expected results. The pump of which the volume flow is to be measured has a hand-calculated flow rate of $$Q = \dfrac{n}{ 60 ...
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0answers
58 views

Trying to understand the gold-rabiner pitch detection algorithm

I am currently in the process of taking on implementing the Gold-Rabiner pitch tracking algorithm, and I came across what seemed like a good explanation of it in David Meehan's "A Code Excited Linear ...
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11 views

Video quality assessment method

Do you know any method for objective video quality assessment except PSNR and SSIM? It should be relatively easy implementable in any langugage, but can be more difficuilt than SSIM. I found VIF, but ...
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9 views

GAPES- like estimation methods

I'm searching for a-parametric methods for gap estimation. These methods don't have to relay on spectral analisis. I need these algorithms for comparison between GAPES with other algorithms. thanks.
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32 views

algorithm for low frequency filter and analysis

i have a number of analog signals being monitored and then compared. My issue is that the signals are not synchronized (potentially 4-5 seconds out of phase) and my target "trouble" frequency is much ...
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1answer
102 views

Convert a 1D array into a 'rotated' 2D matrix

simply put, let's say I have this array - [1 2 1] I want to try and get this output in Matlab [1 1 1 1 2 1 1 1 1] It's like my array was 'rotated' ...
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2answers
298 views

Simple and efficient algorithm to detect frequency and phase of a sine signal

I need an algorithm to detect frequency and phase of a pure sine signal. The frequency of the input signal changes between 0 and 100 Hz. The value of the signal gets captured with a frequency of 20 ...
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1answer
57 views

Help me understanding this source code of a Phaser

I tried to understand the following source code of a Phaser: ...
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70 views

Fingerprint minutiae matching

I am working in a fingerprint recognition project using C code running on embedded system. After processing the fingerprint image, I have the minutiae now. I tried to matching two sets of minutiae by ...
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1answer
50 views

Efficient algorithm for computing area under convolution?

Consider $N$ discrete signals $x_1(n), x_2(n), \ldots,x_N(n)$ each a bounded support of size $M$. To convolve them, we can zero-pad each of them, multiply their FFTs, and take the result's inverse ...
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3answers
164 views

Multitone signals with low crest factor

I am trying to generate a multitone signals with low crest factor and as suggested in the Boyd's paper I am using the quadratic phase distribution: $Phase(k) = \pi(k - 1)(k - 1)/N$ where $N$ is the ...
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20 views

Detect road surface in a traffic scene point cloud

I want to analyze a traffic scene. My source data is a point cloud like this one (see images at the bottom of that post). I want to be able to detect objects that are on the road (cars, cyclists ...
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1answer
155 views

AGAST vs FAST evaluation

In ~2006 the FAST corner detector was introduced. One of it characteristics is that you have to train a decision tree from some test image in order to learn the types of corners present and relevant ...
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20 views

Sliding Windows, Global Image, Clustering and …?

Imagine that you have an algorithm that must detect some feature in an image. Right now, I know three "families" of search algorithms. Sliding Windows: You take a patch of some size (e.g. 15x15 ...
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75 views

Bhattacharyya distance for image segmentation explanation

I have a question need some your suggestion. I spent 2 months to resolve that problem but the result is not so good. Hence, I would like ask you some thing about my implementation. My goal is that I ...
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2answers
65 views

Algorithms for deformable image registration

I need to perform a deformable image registration (DIR) for delineation of the different brain parts on the brain MRI 3D image. I faced with a problem that there are a lot of different approaches for ...
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17 views

Stegnography and cryptography

I am last year student working on the project: Separable reversible data hiding technique In encrypted image. What are the algorithms that we can apply on jpeg/png image for compression which ...
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1answer
121 views

Analysis and algorithmic complexity of the Constant Q transform

Here I am again (Implementation of the constant Q transform + property questions) :) I was reading this paper on a constant-q transform algorithm, where they managed to turn the following equation ...
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117 views

GCC-PHAT cross correlation

I am trying to implement GCC-PHAT in python. The approach is similar to the following two links: link1 and link2 It seems the only difference between GCC-PHAT and normal cross-correlation using FFT ...
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2answers
81 views

Pose estimation of colored checkerboard cubes

I want to find the orientation of 2x2 checkerboard cubes, like these: That is to say, I want to recover their positions and rotations within the image relative to the camera. In my particular ...
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2answers
34 views

variable length no-refrence filter algorithm

I'm searching for a an algorithm or an idea of implementation. I need to filter a signal in real time, and want to change the length of it (number of taps) in order to change the delay. In low ...
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20 views

How to choose weighting factors of a cost function?

suppose I have a cost function to be minimizedidea of the form $$ J(k) = e(k)^TQe(k)+ u(k)^TRu(k)$$ where $e(k)$ is the residual error, $u(k)$ is some control signal and $Q$ and $R$ are wighting ...
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25 views

Low dimensional system identification algorithms

I'm a physics Phd student and just have a self-taught knowledge about lti-systems. After a while I found out that several techniques such as heat capacity or thermal-conductance measurements can be ...
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2answers
234 views

What's the underlying algorithm for detail-preserving upsampling in Photoshop CC?

The detail-preserving upsampling algorithm in Photoshop CC is truly amazing. It can upscale any image while preserving details in almost real-time. And I truly wonder how it is implemented. I've ...
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2answers
253 views

fast 2D cross correlation algorithm

I want to match a small template to a larger image, that the distance between the template and the subimage with the same size of the template is minimized. It can be solved directly or by applying 2D ...
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3answers
233 views

Measuring audio Signal Similarities

i have recorded samples of lungs sound (person breath) signals from electronic stethoscope. how can i measure(in percentage) the similarity between two audio signals (lung sound), the general idea is ...
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33 views

I'm interested in the state-of-the-art of vocal sound synthesis. Please advise me [closed]

Some of the things I'd like to accomplish: Strip the vocals from a recorded song as best as possible Recreate someone's song voice (like a famous artists') using someone else's voice as input Adjust ...
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1answer
99 views

Which come first, PCA, FFT, filtering

Might be a simple question, but I keep second guessing my algorithm, so a confirmation would be good. I first do bandpass filtering, then PCA, then FFT of the top principle components. I also do some ...
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1answer
101 views

Computer Vision/Image Processing Riddles [closed]

I know this topic is not clearly relevant to the forum, but I think it's fun and interesting. I'm looking for computer vision riddles - fun and interesting questions that have a clear and precise ...
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1answer
131 views

How to transmit the real+imaginary output of an IFFT over a transmission channel?

I'm working on a modem system using a 16-QAM scheme. The transmitter runs an IFFT to modulate the signal, and has a 12-bit DAC. The receiver runs an FFT to demodulate the signal, and has a 12-bit ADC. ...