Algorithm is a method expressed in a finite list of steps of well-defined instructions to process a signal.
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17 views
Spatial Expectation Maximization matlab
I am looking for the way to implement spatial Expectation Maximization matlab code. Because traditional EM cannot handle with noise image. Hence, I want to find improved EM matlab code. Could you ...
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0answers
35 views
The relationship between zero level set and thickness information
I have one problem that need you help. I am try to find the relationship between active contour and thickness information. For defination of thickness we can find at thickness measuring and active ...
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2answers
45 views
Measure of intermittency/continuousness of a signal
I have three signals (below) each having the same standard deviation, however, are clearly very different temporally.
Is there some such metric that could be calculated for each of these signals to ...
3
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1answer
60 views
Measuring similarity of music, using lossy compression
I have two sound clips $C_1,C_2$ which are pretty similar. I'd like to measure how perceptually similar they are, i.e., how similar a human would perceive the two to be. Is there a way to use a ...
3
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2answers
169 views
Algorithms for finding fundamental frequency based on ACF result
I am developing a software for fundamental frequency tracking. For this purpose, I have designed a function which calculates autocorrelation over the signal and a second function which, based on ...
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1answer
52 views
Detecting changes between voice and music
I have a bunch of audio files that have both speech and music parts (think radio). For instance, a given file might consist of the following sections:
...
3
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2answers
67 views
What is the state of the art for vocal elimination/reduction?
I have no background in signal processing but I would like to know what is the actual state of the art for vocal elimination/reduction. Obviously, I am not talking about the infamous "stereo ...
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0answers
21 views
select meaningful part out of a signal (for goertzel)
I have an on going input signal, most of the time with no activity.
Once in a while there is an activity (oscillations in different freq).
I need to take good 205 samples out of the signal.
what i ...
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2answers
59 views
what is the output of BoW after an image has been trained with SIFT algorithm and k-means
SIFT algorithm provides a 128 dimensional feature vector that is used for image classification.When all the interest points(key points) are taken together and K-means clustering is applied,the image ...
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1answer
101 views
Voice Audio Detection algorithm
I have to detect speech intervals in large pre-recorded files in my project. I think, there won't be so much noise in the background (audio will be recordered in the room or even in the studio), but ...
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0answers
24 views
Macbeth Color Chart auto detection
I'm a looking for a way to detect macbeth chart in a given image.
I have already seen these 2:
https://github.com/ryanfb/macduff
...
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1answer
36 views
Unsupervised way to choose k in K-Means algorithm
There are couple of methods listed here about finding the value of k in k means algorithm. How much sound is each of these procedure when used to find out the value of k in unsupervised manner.
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1answer
25 views
Non-linearly additive spectral subtraction?
The following pictures describe my situation. Any thoughts on an appropriate algorithm I could use to solve this problem?
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1answer
44 views
Gesture recognition from analog sensor value
Not sure if this is the right place for my question but let me give it a try.
I have a very simple analog sensor (piezo transducer) which is attached to a microcontroller. I'm using this sensor to ...
2
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1answer
81 views
How to detect quadrilaterals in a point cloud?
How can I detect a quadrilateral in a point cloud that looks almost like a rectangle? How do I set the criteria (i.e orientation, size etc) to get the shape for example in the image below?
2
votes
1answer
141 views
Barcode localization in difficult environments
I'm creating a program for localizing types of barcodes.
(I know plenty exist, that's not the question :) )
I'm focusing for the time being on 1D barcodes.
The difficulty I have is that the barcodes ...
1
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1answer
63 views
Speech Enhancement Libraries
Is there any speech enhancement algorithm library?
I need to process a sound to voice recognition, and I want to remove noise from audio source.
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2answers
184 views
HPS Algorithm for detecting the fundamental frequency of a guitar string
When you plucked on a string, the string is vibrate and except the fundamental frequency,
there are an integer multiple of the fundamental frequency, which are the harmonics.
I know that the HPS ...
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2answers
67 views
Digital Panning Effect
To get a panning effect I know that there is a need for a Circular Matrix.
The angle is can be set as a default or I can let the user to select the angle.
So if the angle is '0' (teta)
The ...
3
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1answer
174 views
Digital Distortion effect algorithm
I read the DAFX book by Udo Zoler about the distortion effect at pages 124-125
and it says that suitable simulation of the distortion is given by the function:
...
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0answers
96 views
Digital Image Processing - Contemporary Research Topics
I need to propose a masters degree topic, and I'd like it to be in digital image processing. What are currently relevant topics in this area?
I suppose that I'm looking for some kind of ...
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4answers
187 views
Best signal processing method for this application?
I have a signal I'm getting from a sensor (shown below in the photo of an excel plot) and I need to process it to get it to look something like the red line I've overdrawn on it. Sort of a moving ...
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0answers
38 views
Shadow removal from gray scale single image and unknown light source
I look for a paper that treat the case of shadow removal from a single grayscale image where the shadow is created by a unknow light source.
5
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1answer
98 views
PID With Prediction
First, I just want to start off by saying that I am a programmer, and am no expert in complex algorithms, and will probably not be able to apply complex pseudo-code or other descriptions of a ...
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1answer
52 views
Online materials on Support Vector Machine [closed]
I am doing my final year project on Image Processing.I want to know about the Support Vector Machine.Please suggest some links for the former.
Thanks and regards in Advance
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1answer
221 views
AutoExposure with nonlinear camera: Non linear proportional PID?
Now I', wondering how to best implement a control algorithm for it. I tried using a PID controler but started with a simple P-control first. The problem is, that when using the equation ...
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1answer
138 views
discrete Haar wavelet transform, fast and efficient method?
I'm working on my own implementation of the discrete Haar wavelet transform, I understand the wavelet theory and how to construct the Haar matrix of size N to perform the transform, but obviously ...
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0answers
53 views
Estimating Position Based on Range Measurement
I want to present Kalman Filter problem.
For simplicity I'd assume the simplest dynamic model - Piece Wise Constant Velocity.
The state vector and dynamic model are given by:
$$
\begin{bmatrix}
...
2
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1answer
89 views
Histogram evaluation for image quality concerning illumination
I'm currently trying to develop an algorithm to control the camera characteristic of a camera (the camera characteristic can be controlled to adopt it to the different lightning situation which can ...
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1answer
36 views
Algorithm to change an already sampled guitarstring to sound like it was a bit damped by the hand [closed]
I'm trying to simulate the damping of the hand on a guitarstring on an already recorded/sampled open guitarstring sound. I've been trying to use low pass filter and had a moving frequency range but ...
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0answers
45 views
How does sensor fusion work? I want to understand the math/physics/algorithms
Sensor fusion algorithms can give a more precise 3D orientation (and possibly postion?) of a device by combining readings from an accelerometer, gyroscope, and magnetometer.
Can anyone explain, or ...
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0answers
88 views
Using Bhattacharyya Distance for feature selection
I have a set of 240 features extracted using Image Processing. The objective is to classify test cases into 7 different classes after training. For each class there are about 60 observations(viz, I ...
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2answers
109 views
How do I perform the sifting process in empirical mode decomposition?
I am programming a voice activity detection algorithm and I found a paper that recommends the use of HHT. I have been trying to program it and understand how to calculate $m1(x)$, but the shifting ...
5
votes
1answer
177 views
How to detect specific behavior in time series?
I was not quite sure what the right SE for this was, so I posted this also here on SciComp. Please tell me which one to remove :)
Problem statement
I have a few hundred unrelated time series, say ...
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1answer
124 views
Image processing research areas using GPU [closed]
I'm an undergraduate student and I am currently trying to find suitable topic for my bachelor thesis. The broader topic I've selected is "Image processing on GPU", so basically I'll be developing ...
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1answer
120 views
Guitar Tuner or Guitar effects Algorithms? [closed]
I need to explore the algorithm of the digital guitar tuner or the digital guitar effects algorithms.
Is there any Book or articles that you recommend of?
All I know is that relate to DSP.
thanks
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1answer
51 views
How to find f given that f(some_image) = processed_image
I have a before/after image pair with pixel transformations only (for example, grayscale, or a hue shift. No blur, border, sharpen, etc.). I'm trying to find a function such that for every pixel ...
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0answers
13 views
What is the preferred way to regularly space data? [duplicate]
I have some data that was collected at irregular intervals, and I want to estimate the values on a regularly spaced time grid, so that I can take FFTs etc. I've not had to do this much before, and I'm ...
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3answers
92 views
Algorithm to compute the Variance of the signal?
I have 6.4 sec recording of a discrete signal on 40Hz frequency (256 values).
How can I compute the variance of the signal?
Please, share an algorithm in pseudo-code or in an actual programming ...
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0answers
179 views
HOG descriptor algorithm
I would like to implement a HOG descriptor in C++.
I found an implementation of this code here.
An extract of the code follows:
...
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2answers
526 views
Algorithm to zero pad data before FFT
I've seen some other questions on here about zero padding (like this one) but I'm still a little confused about my situation.
I'm attempting to zero pad my input time series data, so I get an ...
2
votes
1answer
218 views
Improving the communication speed on a 10km cable (with high capacitance)
I'm working on improving the modem communication speed that can be achieved over a 10km cable. The current modem achieves a speed of 9600 bps via hardware (phase locked loop) and I'm looking for ways ...
1
vote
1answer
93 views
How to calculate the similarity of two electric waves
I have two electric signals from different sources and I think that are similar.
I have the FFT of the signals and I have their spectrums of frequency in separate arrays.
How should I proceed to ...
3
votes
1answer
174 views
How to add more cowbell?
Remember that Christopher Walken skit on Saturday Night live where he told the band “it needs more cowbell” https://en.wikipedia.org/wiki/More_cowbell ? This site automated it ...
3
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1answer
327 views
QPSK soft decoding
I'm trying to decode a Hamming Block Code transmitted using a QPSK modulation.
For the moment I can sucessfully decode it using hard decision but in order to improve performance I'd like to use soft ...
2
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0answers
71 views
a moving average relation that I can't find a counter-example to
Hi: I'm new to this list but I had a question that's not exactly related to dsp but maybe in a slight way and I didn't know where else to send it. So, here goes and my apologies if this is totally ...
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0answers
116 views
FFT of irregular shaped data
I have an irregular shaped 3D image that I want to do frequency domain filtering on. Currently I simply zero-pad the data to make it a cube, then do an fft.
I was wondering if this was a valid ...
2
votes
2answers
312 views
12 bit ADC to 8 bit DAC
A bit of background information:
I plan to start experimenting with digital signal processing on microcontrollers. The particular microcontroller I plan to use (TI Stellaris LM4F230H5QR, from the ...
1
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1answer
186 views
Practical Gardner timing error implementation
I'm trying to demodulate a QPSK communication.
For the moment I do:
Signal detection by computing the ratio between the power of the carrier wave compared to the signal power.
Initial clock ...
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1answer
547 views
voice pattern matching algorithm
My idea is to find a word in wav/mp3 files. It is just one word.
I have a database with a few hundred songs.
I am looking for pattern matching (this is not an exact pattern) it can be an word i ...
