MATLAB (MATrix LABoratory) is a numerical computing environment and a fourth-generation programming language. Use this tag with care.. see excerpt.

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Fingervein image process [on hold]

I should process finger vein image using Matlab software in 2 mounth, i have not worked with matlab a lot, but i know matlab toolbox, can anyone help me, what function should i use for vein detection ...
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2answers
55 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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37 views

Velocity estimation knowing acceleration and displacement from measurements using Kalman filter

I am having a hard time in trying to use a Kalman filter to obtain velocity from acceleration and position measurements. I think the main reason is that I am not familiar with Kalman filters (I had ...
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1answer
34 views

Discrete or continuous Kalman filter?

I have position and acceleration measurements and I would like to apply a Kalman filter to estimate the velocity of the system. I am not sure yet about how to procede, but I will check the already ...
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15 views

perform linear regression by taking a batch of sample from an acoustic signal

I have an acoustic signal of a machining operation sampled at .1Mhz. I need to continously acquire a batch of n samples from this acoustic data and make a linear fit for the sample. Can anyone help me ...
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5 views

How do we find the SNRseg if I have a block with 2D in time domain

I always get the answer -.0017 and it suppose to have some negative number around 30. I get the average for the plane voice then the average for the difference between plain and the encrypted voice ...
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31 views

making video of wheel after sampling in MATLAB

Write a Matlab function named wheel.m to create a movie showing the spokes image rotate clockwise at a constant speed. The function should take parameters to change the frame rate and the speed of the ...
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2answers
61 views

time domain data into FFT using Matlab

I do like to generate the FFT from time domain history data (experimental lab) using MATLAB. I am not so sure if my coding is right? Can someone verify the coding. My code is as follow: ...
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19 views

How to plot magnitude response on MATLAB Gui [closed]

I have a FIR digital filter with some impulse response, I would like to graph the magnitude response on Fs = 44.1kHz on MATLAB Gui - axes I tried to use fft but it has two-sided look, linear scale, ...
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1answer
74 views

removing vocal from audio file

I want to create a program in matlab that could act like karaoke software. At this moment i have following lines of code: ...
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1answer
32 views

Adjust Matlab Gui parameter while playing an audio [closed]

I would like to design a very simple MATLAB Gui program to adjust the magnitude of an audio while it is being played via a slider (slider1). However, the program ...
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1answer
20 views

How convert scal to frequency when use cwt in matlab

I am new in DSP.I have the flowing code t = linspace(0,1,1000); x = cos(2*pi*60*t); CWTcoeffs = cwt(x,1:64,'sym8','plot'); colormap jet; and my output is: ...
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1answer
42 views

What is the correct inverse function of the Matlab function fft? [closed]

I used the Matlab function fft but I am not sure which function is the correct inverse to go back to the time domain.
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23 views

Matlab coding for bandwidth interval

I have time domain history data. Then, I convert it into FFT to get the frequency domain history data. The problem is, how to determine the bandwidth of the FFT data? Is it automatically synchronize ...
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1answer
23 views

Classification from a feature vector

I'm quite new to this; I'm try to classify textures as defective or non-defective. I've used a Gabor filter bank with Matlab which outputs a column vector of the Gabor features of an image. I have a ...
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1answer
55 views

Real valued FFT in Matlab

I'm trying to compute FFT of size (N/2) for sequence of real values of length N. I'm using this recipe. Here is my code in matlab: ...
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0answers
19 views

Sound source locator using multiple microphones — How to? [closed]

I need to create a sound source locator using three microphones. I plan to start off by connecting three microphones to my windows PC, and then taking input from them using matlab to monitor their ...
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1answer
27 views

Algorithm implemented in the timeseries\resample function of Matlab

Does anyone know what algorithm is implemented in the Matlab function resample for timeseries? I had a look on the manual but it just gives the instruction to use ...
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1answer
30 views

Avoiding identifying objects within previously identified objects in MATLAB

Apologies if the question title is confusing. I've got some code below in MATLAB, which identifies squares/rectangles in an image. ...
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0answers
17 views

extracting audio and video from video file

I tried the following code in MATLAB R2013b ...
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1answer
49 views

Phase difference between two sinuisoidal signal

Currently, I have two signals, the main components of both signals are 60Hz, but both also have weaker response at 180Hz + small amount of noise. As shown in the photo below, I want to find the phase ...
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1answer
70 views

Fourier transform possible on non-rectangular part of an image

Dear Signal Processing readers, I want to introduce 'noise' into parts of images. Until now, I worked with rectangluar images for a similar purpose and did the following, using (inverse) Fourier ...
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1answer
38 views

Formulas to plot Frequency Impulse Response Coefficients

I made this question newbie:Plotting FFT and Impulse Response Coefficients, using Java I have the IRC: Impulse Response Coefficients: $h(k), k = 0, 1,.., N-1$ Low Pass: ...
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2answers
50 views

Simulating noise in OFDM

I'd like to simulate a certain $E_s/N_0$ in a baseband OFDM MATLAB modem to generate SER curves. I randomize 50 QAM symbols with $N$ subcarriers each in frequency domain, add null frequencies (guard ...
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1answer
83 views

Object Detection Algorithms

I'm a complete beginner to object recognition. I need to identify and count how many of a certain type of Lego, in a picture full of different pieces of Lego, using MATLAB. The pieces of Lego I need ...
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1answer
32 views

Re sizing and thresholding small font scanned Arabic words

I am working on an arabic OCR for printed scanned documents ... Some of the scanned documents may written with font size of height 8 which is quite small ... I want to resize the height to 60 pixels ...
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8 views

How is the extracted HoG size related to the original image?

I would like to know if there exists any correlation between the extracted HoG size and the image it was extracted from. For example, in undecimated wavelet transform, the feature size is exactly ...
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17 views

Why Matlab fdatool designed butterworth filter and butter command's co-efficients are different

I met an great confusion. Using below command I have got co-efficents for a 300Hx cut-off high pass filter of order two. [z p k] = butter(2,(300/44100),'high') [sos,g] = zp2sos(z,p,k) Now ...
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2answers
24 views

Trying to recreate sawtooth and square wave in Matlab

I've been asked to recreate the square and sawtooth wave shown below: And I've managed to recreate the square wave form but I can't seem to get my sawtooth wave to match. ...
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3answers
61 views

Generate projection image by OpenGL or Matlab

I want to generate the "projection" image described as bellow. The left picture is the original picture and the right image is what I want. But, I have no idea about how to generate the right image. I ...
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1answer
19 views

Problems filtering image with prewitt

I'm trying to filter an image vertically to get the edges, in MATLAB, but I get very different results from convultion and correlation. CODE: ...
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0answers
26 views

Imposing a prescribed motion field to a grayscale image

I have a grayscale image with intensity distribution $I_1\left(i,j\right)$. I am trying apply a motion field $$u\left(i,j\right), v\left(i,j\right)$$ where $\left(i,j\right)$ is the index ...
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41 views

Modulating Gaussain Pulse

I'm trying to generate a modulated Gaussian pulse. First I'm generating the pulse in the time domain perform FFT and displaying both in time and frequency, then I'm multiplying it with cosine term ...
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26 views

Using bilinear method while filtering a signal - Matlab

i have to current signal in matlab: Fs = 8000; T = 1/Fs; N=512; t = (0:N-1)*T; ...
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2answers
55 views

Line tracing folowing a path of an almost connected components

say we have a binary image like the one in below i would like to extract each black line, even if it's not almost connected i have marked here in red, example of lines that correspond to those to be ...
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1answer
27 views

Applying lowpass and highpass filters to an image in frequency domain in matlab

What i want is simply to apply low pass and highpass filters to an image in the frequency domain. Does matlab image processing toolbox have any commands for this?
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16 views

Estimate Image power spectrum of the noise

I want to implement Wiener filter. I have original image and image blured with linear motion. The one thing I am lack of(to implement it) is Noise power spectrum. I know that it is hard task. I've ...
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16 views

How to measure spectrum envelope in matlab

I would like to measure the energy change of the spectrum envelope of a wav file like 20hz - 40 hz and plot a graph like this in matlab: Sorry I have no knowledge about signal and would like someone ...
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2answers
111 views

system response: time vs frequency. Why do I get different magnitudes?

I am simulating a linear system described by the following equation $m \ddot{x} + c \dot{x} + k x = A \sin(\omega t)$ ...
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1answer
40 views

retrieve phase of an extrapolated periodic 1D signal

I have a periodic signal on a given grid, say (in matlab format): ...
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21 views

Applying Bilinear filter to a signal -MATLAB

I have the following code: ...
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2answers
56 views

How to calibrate three orthogonal cameras?

I am trying to find out intrinsic parameters(focal length ,principle point,and lens distortion coefficients)as well as the extrinsic parameters(rotation and translation of each camera relative to the ...
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1answer
25 views

Hough Tranform Matlab

i Want to implement hough transform on image without using inbuilt function...some papers say that the image is first flipped before applying hough transform i am not understanding how matlab is doing ...
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14 views

Isolated word classification using LDA

I would like to do a project on speech processing. How can I classify isolated word using linear discriminant analysis for my speaker recognition project.
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1answer
51 views

Why oversample data before using raised cosine filter?

In the process of creating a baseband signal, the complex symbols are filtered using a raised cosine filter to perform pulse shaping (I'm following some literature as a guide). The pulse shaping is ...
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0answers
27 views

Choosing the frequency for a comb filter

I have an audio sample. From doing FFT on it it looks as if I need to use a comb filter to remove resonant frequencies. This is what I generate: I honestly have no clue where to start ...
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1answer
61 views

Implementing overlap add method for convolution with a slice of the filter

In overlap add method for convolution a filter $x$ of length $M$ will get convolved with a signal $y$ of length $N$ where $M << N$, i.e., $z = x * y $. Here the signal $y$ is sliced into ...
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1answer
65 views

Get data ready for IFFT

I am having troubles applying the IFFT function to some data I have. I already had a look here Complex conjugate and IFFT and here What assumptions should be used to invert spectrum into time domain ...
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1answer
28 views

coded filter vs fdatool : inconsistency in the results for same parameters

I tried creating a filter in 2 different ways in Matlab and I obtain different results: one filter is stable, whereas the other one is unstable. Coded filter ...
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1answer
64 views

Filters performance analysis

I am working on some experimental data which, at some point, need to be time-integrated and then high-pass filtered (to remove low frequency disturbancies introduced by integration and unwanted DC ...