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I want to apply a homomorphic process to an image, and one of the steps involves the imadjust function. The source of this code is http://www.csse.uwa.edu.au/~pk/research/matlabfns/
One of the steps in the homomorphic process is the histogram truncation. This is where toward the end, imadjust is applied like this
newi... |
When someone says apply gaussian kernel, is that the same thing as saying, convolve it with a gaussian mask?
|
I am simulating (in Matlab) the transmit portion of a comm system. I generate random data, then I want to modulate it to BPSK, pulse shape the data, and then potentially shift it up in frequency by a carrier. My question is regarding the pulse shaping portion.
Atleast in matlab, to generate the root raised cosine fil... |
Some background: I am putting a sig-gen signal through an ADC, into an FPGA where I can modify it, out a DAC and up to a SpecAn. All that works fine.
I am experimenting with fractional delay filters, coefficients, and IF values (which are just my sine wave coming in for testing). I sample at 200MHz, and I have played... |
I have obtained this from Wikipedia about the application of Earth Movers Distance to pattern recognition. Can anybody explain the concept of signature used in this Wikipedia article. Thanks.
|
I am trying to implement a phase vocoder overlap-add pitch shifting algorithm for part of a plugin I'm writing. I have done this kind of thing offline before and I understand the theory, but this is the first time I've attempted to do realtime processing. This seems to add extra difficulty.
Here's my issue: the audi... |
I know that 3 conditions must be met in order a pair of stochastic processes $X(t)$ and $Y(t)$ to be characterized as jointly WSS:
1. $X(t)\;\; WSS$
2. $Y(t)\;\; WSS$
3. $R_{xy}(t_1,t_2) = R_{xy}(t_1 - t_2) = R_{xy}(t_2 - t_1)$ which means that their cross-correlation function should depend only on the difference $T = ... |
We are using phase correlation to find pattern on image and what we get is 15% of results is spurious. Ours pattern has 32x32 pixels and image for research has 32x512 pixels. So we put Pattern to 32x512 pixels image to the left side and the rest of image is filled by zero pixels. Next we apply FFT to pattern and the im... |
My professor told me that in sampling a signal, is not usual to respect the Shannon theorem because the interpolation formula contains sines and fractions which are difficult to calculate with a microprocessor.
Why is audio sampled at 44.1-48 KHz (Nyquist frequency of audio signals)? Is there a dedicated hardware for ... |
Suppose that I need to apply a convolution filter to an image. I want to do it by using the convolution theorem so I compute the kernel for the size of the input image to later calculate fft's and multiply. But I want the fft calculation to be less time consuming. The kernel loses its magnitude the further from its cen... |
Currently, I am developing a piece of software for chord recognition. There are FFT and pitch class profiling on it. I tried using the pitch class profile proposed by Takuya Fujishima, but the result is not quite accurate. This may be because I misinterpreted the pitch class profile algorithm.
I don't understand the fo... |
I have two sine signals with frequencies f1 and f2, and phase p1 and p2.
I modulate the phase of these signals to transmit two symbols simultaneously, chosen from the set [0,1,2,3]. For example, I represent 0 by 45 degrees phase shift, 1 by 90 degrees phase shift, etc.
The signals will pass through an optical communi... |
I am having trouble understanding the example program for audio recording ,
it comes with PyAudio module.
I am using an external Audio Card to record the sound , obviously, the voice should be converted into the digital form to be presented to the computer. But i do not understand how this code converts the input Anal... |
I have the following vector and wavelet transform (from R waveslim package)
x<-c(0.1,0.4,0.1,-0.05,0.025,0.12,0.42,0.14,-0.15,0.25,0.35,0.23,0.11,-0.35,0.025,0.1,0.4,0.1,-0.05,0.025,-0.12,0.2,0.09,-0.05,0.05,0.15,0.13,0.21,-0.15,0.023,0.1,0.4,0.1,-0.05,0.025,0.12,0.42,0.14,-0.15,0.25,0.35,0.23,0.11,-0.35,0.025)
J = 8
... |
What's the correct way. Should I zero-pad a signal before or after applying a windowing function?
|
I am learning about ADC MCP3422 Chip, because I want to use ADC Pi chip with my Raspberry Pi which is using MCP3424 ADCs, but I am having trouble understanding how the ADC calculation is done in the datasheet.
(Data sheet links are available in the end)
From what I know of ADCs,
An ADC has a bit size.
and ADC tends to... |
I am trying to develop a filtering routine, using Java, and I am using the windowing method.
From my studies, I was told that if I make a plot of the impulse response of an ideal lowpass filter, I would get a SINC graph. In this situation, what am I plotting against (i.e., what values are on the X-Axis?)?
|
I am a beginner in opencv and have started learning it using visual studio 2012 and opencv 2.4.7 . But i got stuck at very beginning .I want to know about Mat used in Opencv .It is a class and an image name is a variable of this class .i just know this .but still i am feeling like i didn't get it totally like what are ... |
This is a rather general question. Suppose I have an arbitrary filter, $F$, defined in the Laplace domain;
$$
F=k\frac{\prod_i (s+z_i)}{\prod_j(s+p_j)}.
$$
How do I calculate the impulse response of this filter analytically? As a specific simple example, consider the first order low pass filter
$$
F_0=\frac{1}{s+p}.
... |
Is there any way to remove useless information (unimportant details) from an image?
If, for example, we have a specific image, so this contains both useful and useless information. If this image can be recognized directly without the useless information, the unnecessary information can be removed (e.g., illumination, s... |
I'm experimenting with a 30 Hz sine wave and I want to extract the frequencies of this, and have implemented the algorithm to do so. This gives a correct reading, well, gives 29 Hz.
I'm now wanting to compute the algorithm for an STFT. So, for this, I use NFFT = 256 with an overlap of 128, using the Hanning Window fun... |
I'm trying to implement the Iterative Hard Thresholding recovery algorithm for compressive sensing in python. It is a very simple algorithm, given
$ \mathbf{y}( = \mathbf{A}\mathbf{x}), \mathbf{A}$,
we start with $\mathbf{x}^{[0]}=0$ and update the estimate of $\mathbf{x}$ iteratively with,
$\begin{equation} \mathbf{x... |
I have a (rough) known period sine wave coming in, held in an array, with superimposed noise. I need to find and count the maxima and minima (in C). Any suggestions or algorithms? The signal has already been received and buffered, so not real time.
|
I'm having a hard time wrapping my head around doppler and how it affects a digital communications signal's baud rate. The examples that I've seen explain that the center frequency of a signal is shifted when either the receiver and/or transmitter are moving relative to each other. What I don't understand is the why ... |
I have a handwritten document which contains graphics, tables, and text paragraphs.
I know how to extract graphics from this document. Now I want to know how can I discriminate between text lines and table rows, if I have already segmented the document into lines?
You can see an example of a document image below: in re... |
What are the best ways to estimate the power spectrum of a given time series? Any pointers to review articles or book chapters would be appreciated.
A little more information: When estimating a power spectrum from a time series, I typically use Welch's method (matlab command pwelch) with the default parameters. My un... |
I have a chemical spectrum with amplitude on the Y axis and wavenumbers on the X axis, sampling interval I think this is $1.5^{10}$ hertz. I would like to reconstruct the amplitude/time representation of the original signal by performing a ifft of the signal however I have no phase information. Since the information is... |
I might be going crazy here. Following my question: here
I did some thinking and probably understood that my STFT algorithm was not performing correctly.
I followed this algorithm:
-> Get 256 of data
-> Apply windowing function
-> Get the FFT
-> get the first 128 points
Here is my result. I have used NFFT = 256 which... |
Having some trouble understanding this concept, really could do with some advice.
I want my STFT to have the following parameters: NFFT = 256 overlap/hop = 128
Now essentially, the algorithm will work as follows:
1) Split the signal into blocks of 256
This will result in around 72*265:
2) For each of these blocks, ca... |
I was reading on windowed fourier transform and wavelet transform, and i was thinking that the windowed fourier transform is a subset of wavelet transform. Is that true?
|
A device is rotating with a particular wind speed and producing such pulse frequencies in a minute:
24.988 25.224 25.212 25.066 25.310 24.963 24.826 24.944 25.490 25.176 24.740 24.988
24.994 24.722 24.510 24.863 25.249 24.931 25.218 24.907 25.459 25.292 25.163 25.447
25.072 25.360 24.976 25.103 25.237 24.845 25.23... |
I am trying to replicate the spetrum as given in Audacity and other commercial software... I am getting crazy with the correct scaling needed in order to have dBFS (with reference to a full scale sine wave).
Suppose $x_t$ is the PCM sample at $k$ bit precision, first of all I rescale the PCM samples
$$
s_t = \frac{x_t... |
I'm doing pattern matching by means of normalized grey-scale correlation. My input image is noisy and so the peaks in the correlation plot cannot be found just by thresholding.
The original correlation plot displayed as a surface, the peaks are visible, but are not the only local maxima in the picture, I need to find ... |
If I have the discrete Hartley transform of a signal of length 2n, how can I use it to efficiently obtain the discrete Hartley transform of the same signal padded to length 2n+m for some m > 0?
|
I was reading a paper 'A Flexible Framework for Local Phase Coherence Computation' (paper URL) on using wavelets for local phase coherence. I just want to be sure. Is the gabor wavelet the same as the gabor function in the gabor transform (STFT)? If not, can we use a Windowed Fourier Transform instead?
|
I have a signal that consists of a sine wave, on which I apply a rectangular window and then an FFT. I'm only interested in the magnitude of the sine wave, and I want it to stay the same even if the signal shifts a few samples to the right relative to the window (of course assuming the sine wave has the same amplitude ... |
I am new to DSP, so I wan't to know a couple of things. How does µlaw encoding function on a log scale such that you can input 16-bit signals and get the 8-bit µlaw signal output, after compression, and then use that as a building block to expand it back to 16-bit signals. I would love if someone can guide me through t... |
I have a question regarding the fourier transform. If I plot the frequency against the fourier transform for a periodic signal and I get a peak, What is the physics behind it? I want to know the physical meaning of it.
Why we get a peak and what does it signify?
Thanks
|
I have been using convolution for finding outputs of various systems .I know how to use it.But I still don't know what does convolution exactly means? how one can define convolution ?
|
I have been experimenting with speaker independent automatic speech recognition. At this point, I understand that the signal is typically segmented into overlapping frames and MFCCs are extracted as features for each frame.
A lot of the texts I read talk about reducing the dimensionality of the features using (for exa... |
I'm working on a sound card based OFDM system and ran into some problems:
How can I perform DAC on the real and imaginary parts of the IFFT? I think they are real numbers instead of 0 and 1. Thanks.
|
Ok, so I'm kind of moving forward with implementing the STFT. I realise that I was taking the entire FFT and not the first half.
The problem that I'm having now is, understanding how to get the Freq bins, what calculation should I use? For example, I have been using this formula:
(10 * log10(sqrt(v[i][j].re * v[i][j].r... |
Given a difference equation, how do we tell if it is an IIR filter or FIR filter?
For example,
y(n) = x(n-3)+y(n-1) . Is it FIR or IIR? Can you please give me a way to figure this out?
Thanks! :)
|
I'm trying to implement an sound card-based OFDM modem. A paper says:
...A serial to parallel converter is applied and the IFFT operation is
performed on the parallel complex data.
Say I have a stream $S$ of complex numbers, then after serial-to-parallel (S/P) conversion, it becomes $S_1$ and $S_2$. But as far as I... |
I was reading a paper which uses a filter bank of gabor filters with different frequencies and orientations. However, I often see the construction of a filter bank of gabor filters with different frequencies and scales.
I am not sure on the construction of it. How do I construct it, any generic example will be ok. Than... |
I'm doing a small overview of different image representations used in image processing and computer vision. For every representation, I would like to have (at least) the following information:
the name of the family of representations
some basic characteristics of the representation family (what information is retaine... |
When output histogram is not same as reference histogram, why is the method called histogram equalization?
For example below are two figures from http://en.wikipedia.org/wiki/Histogram_equalization. The output histogram (2nd figure) looks nothing like a discrete uniform distribution. Why is it called "equalization" the... |
I sample a continuous signal $s(T)$ over time. This leads to $s[t]$, which depends on several factors of which some are (pseudo-) periodic. I am interested in the effect of one such periodic factors and want to look at signal changes during this period under differing experimental conditions. I know the start and end o... |
I'm trying to apply a frequency shift to a generated despreading code in order to find and track a broadcast signal CDMA. Expected doppler shift range of the signal from center frequency would be approx +/- 5KHz. Based on freq2 = c/(c-orbitspeed) * freq1.
I am wanting to shift the code based on equations, assuming data... |
I was reading and trying to reproduce the results in the arXiv preprint of Periodic Gabor Functions with Biorthogonal Exchange: A Highly Accurate and Efficient Method for Signal Compression by Asaf Shimshovitz et al., and a few questions arose. In brief, the paper outlines a new (as of 2012) family of wavelet-like expa... |
A very simple MATLAB experiment:
f = 200;
fs = 1000;
t = 0: 1/fs : 1;
x = cos(2*pi*f*t);
plot(angle(fftshift(fft(x))));
And here's the output:
Now, made a minor change to the above code snippet; reducing the time duration by just 1 sample, as follows:
f = 200;
fs = 1000;
t = 0: 1/fs : 1 - 1/fs;
x = cos(2*... |
Conditional entropy $H(X|Y)$ tells us how much the average uncertainty about a channel input $X$ is after observing channel output $Y$, and mutual information $I(X,Y)$ measures how much information about channel input $X$ can be obtained observing channel output $Y$.
Doesn't this mean that $H(X|Y)$ and $I(X,Y)$ complem... |
I am wondering about whether or not there is a theoretical limit as to the speed at which we can compute a DFT. We all know that the FFT executes in $O (N \log N)$ time. However, is this a lower bound of some sort?
Might there be yet faster algorithms that have yet to be discovered which we do not currently know about... |
I am using a miniature car and I want to estimate the position. We can not use GPS modules and most of the tracking systems that I saw, are using IMU sensor with the GPS module. In our car we are able to find our exact correct location with image processing but for some parts that don;t have enough markings we can not ... |
I understand and have implemented a 2D discrete wavelet transform that uses a Haar wavelet to process images.
Now I would like to implement a 2D Cohen-Daubechies-Feauveau wavelet transform, but I am uncertain about how to do the inverse transform.
The Haar transform uses a 2x2 kernel, so I have 4 coefficients for each ... |
First of all I would like to say that :
I'm new to DSP and in a "learning curve" hence the "basicness" of my questions.
I've read as many posts/articles as possible on the internet but still need "guidance".
I'm french hence the bad formulation sometimes.
My mission/data context :
Performing data analysis on real dat... |
I am fairly new to DSP have been reading up on digital filters and have a few questions. I have a signal with very high frequencies whose DC component i want to estimate. The magnitudes of these frequencies can be very high too. I can average out the signal, and this works, but the high frequencies mean high sample rat... |
Using MATLAB signal processing toolbox, I have created signals like dirichlet, chirp and etc and and obtained their fourier and cosine fourier transform. Now I want to find the frequency where for example A% frequencies are less than that and use it as a thresholding frequency to compact the signal and eliminate unnece... |
I'm trying to understand PSD, and, it's functions.
So far I have carried out the following:
Segmented a signal with NFFT = 256 and hop_size = 128
Windowed each of these segments (Hamming)
DFT of each Window
Taken the first half of the resulting matrix (n/2+1)
From what I have read so far, the algorithm can be best de... |
I'm trying to figure out how FFT's phase works. Here's my code:
import numpy as np
t = np.linspace(0,120,1200)
acc = lambda t: 10*np.sin(2*np.pi*t)
# signal is a perfect 10 amplitude 1 frequency sin wave
signal = acc(t)
FFT = np.fft.rfft(signal)
freqs = np.fft.rfftfreq(len(signal),1/10.)
real = signal[110]
total = 0... |
I have a doubt, it may be silly. Please explain me.
In K-L Transform, For forward transform we have the below equation
For inverse transform we have the below equation
In reverse transform why the 'A' transpose is not common to both y and m(mean of x) as in Forward transform equation?
|
I am running an acoustic simulation. I put in a frequency and get out a complex number; the frequency response for that frequency.
I wish to generate a 1024-sample impulse response (supposing my output sample-rate is 44.1kHz)
How do I go about it?
I think I have the first step: take the Nyquist frequency 22.05kHz, and... |
I am a quite new to the area of digital signal processing. I am currently doing a project on sine wave generation. I know that according to Gibbs phenomenon, many sine waves add up to form a square wave. So, square wave would contain many frequencies. If we filter that square wave stage by stage using low pass and band... |
I'm learning about the Wiener filter, and I'm working on my own implementation. I'm starting out with the non-causal filter, and I need to calculate some covariance matrices. If the signal is assumed to be a linear combination of a target signal and noise, then the signal can be modeled as: $$x[n] = y[n] + w[n]$$ where... |
I am I am working with 'wav' files in audio signal processing. I am able to find out STFT by using the function " spectrogram(file name, window length). Now I want to apply Inverse Short time fourier transform on the above signal. I tried "invspectrogram". but its showing error as Undefined function for input argument ... |
I know we can use a
-step
-impulse
-sinus
-multisine
-random phase multisine
To identify a system.
But what are the advantages/disadvantags of each type of input?
|
I want to know what is the difference between additive noise, multiplicative noise.. In what domain these noises are handled to remove?
I am interested particularly in image dataset
Does different domains are used in case of satellite imaging where noise due to reflection of frequencies is statistically independent?
|
This question comes from a realistic problem that how to obtain a time domain wind pressure from known wind spectrum. Or similarly, gets rail surface curve from spatial rail spectrum.
Obviously, this question does not have unique solution, since phase information is not given. Usually we assume that phase of the time/... |
I just read the article linked to below:
http://www.eetimes.com/document.asp?doc_id=1275520
Now, I'm planning on doing a Masters in Signal Processing. I'd like to know what the career prospects are for someone graduating in this specialization. Note that I live in the high-tech capital of India, so I should be in abou... |
I am reading a paper using log-gabor filters for feature detection. I was thinking about the difference between Gabor filters and log-gabor filters. Can anyone tell me the difference(s), and a way to implement them? Thanks in advance.
|
Could someone tell me where it is that I might be going wrong with the following problem?
Ok, so I'm computing a spectrogram, and, trying to return the PDS of the signal (to show where the signal has the most energies) which I will then use in plotting the decibels.
In my approach, I multiply each of the frames by the ... |
Hi I was researching on STFT when I encountered this slide online
I don't understand the points, Can anyone explain them? Thanks in advance.
|
I'm trying to compute the real cepstral coefficients of recorded telephone audio in Matlab using the rceps function.
On some audio frames (480 samples per frame -- 60ms of audio at 8kHz), I get a Matlab error: "rceps:ZeroInFFT". The cepstrum does not exist because some of the DFT coefficients are 0. The frames in ques... |
I have done with iris localization. Now I need to perform iris normalization, but I don't have any idea about it. How to implement iris normalization please?
|
Ok, so I have some recorded data over several hours that looks like this (values on y, time on x).
See this image http://imgur.com/fdakUlk
I need a way to use matlab to divide the data into sections depending on their mean value. The sections needs to be atleas a couple of hours. Just by looking at the data they can ea... |
I just started learning about image processing. I am using the book "Digital image processing" by Gonzalez and Woods but I don't like this book very much. I would like to read a book which can actually make me interested in image processing.
Can you suggest some good resources?
|
According to my question about separability of Gabor filters in this link, I want now to convolve my image with this separable filter by using the normalized cross correlation operation. Assume my Gabor filter is G, my image is I. My Gabor is separated into Low-Pass gaussian filter f(x) and Band-Pass gaussian filter g(... |
I am working on signal processing for speaker verification.
I have extracted MFCC features for few wav files using GMM algorithm.
Now, i want to add any 2 MFCC features to another variable.
How can I achieve this?
|
What is the conceptual difference between Kolmogorov-Sinai entropy, Shannon entropy and Boltzmann entropy? Are they interchangeable and mean the same? Where can I find a good lucid explanation about Kolmogorov entropy and why it is needed and its significance. Thank you.
|
I'm trying to analyze the power spectral density of a signal recorded from a Ham radio antenna. The signal is about 30 seconds long, recorded at a 48 kHz sample rate. The frequency is center frequency of 8 kHz recording, with the receiver centered on 5.275 MHz. The signal I'm currently looking at is supposed to be arou... |
I have several seconds of speech signal and I have to detect moments in time of arousal with excitation signal, which is creating by larynx. I'm looking for useful reference since several days. I know that a speech signal is a convolution of excitation signal with a filter response and I've read about cepstral analysis... |
I have a doubt related to calculating the Discrete Time Fourier Transform (DTFT) by hand. Specifically in how calculate the frequency axis of the spectrum. My signal has N values and was sampled at FS Hz, the spectrum would have N entries too (where N/2 values are a mirror of the other half). The maximum representable ... |
I want to extract the oilspill affected areas in SAR images using thresholding, where the affected area appears as darker than surroundings. Here I am attaching the code, where I am able to extract the white portions in the image.
i=imread('oil.jpg');
figure(1);
imshow(i)
title('Orginal image');
% RGB to Gray convers... |
I wanted to consult with some experts whether or not this pre-processing step is excessive for what I'm trying to achieve. I am in a similar scenario as the author of the article, where I have many many colonies that I'm trying to segment and distinguish from the background. So I found this article:
A System for Automa... |
How would you use the MATLAB function below to create a FIR filter with a custom magnitude and phase response? It is from the Statistical Modeling and Inference MATLAB Toolbox
function [a, rw, info] = irls(X, y, wf, s, r2, a0, varargin)
% Iterative Reweighted Least Square
%
% The iterative reweighted least square al... |
I have to find the partial derivative of an image with respect to its x dimension. I am using central difference method i.e
$ \partial_x F(x) = \frac{F(x+1,y)-F(x-1,y)}{2} $
Here $F(x,y)$ represents the image and if I want to use spatial filtering for the same then I can use filter mask as
$0.5 \times [0, -1, 0;0, 0, ... |
According to my question in this link, I applied (with a big help from lennon310) the separability of Gabor filters of any orientation.
The only disadvantage of this method is the convolution in the complex domain. So we can treat the Gabor filter G(x,y) as a two dimensional matrix that has a low rank, since the filter ... |
I'm calculating the beat of song through the frequency domain. I have 60 seconds of audio sampled at 48000Hz, multiplied by a Hanning window in the time domain. This gives me a resolution in the frequency domain of 1BPM, and I'm interested in frequencies from ~10 BPM to ~300BPM, which is only the first 300 bins of the ... |
I know for sure that white noise is considered as a stationary sound, but is that true for the rest of them? http://en.wikipedia.org/wiki/Colors_of_noise
Also, can we meet some of these sounds in nature? Is there any relation between these noises and noises that you can hear in a town(vehices,traffic,people chatting) o... |
So far, I have read that all the non-parametric estimation techniques decrease the frequency resolution in order to decrease the variance in the spectral estimate
What is the general "overview" meaning of variance and what is the advantage in decreasing the variance of spectral estimate?
The PSD can be calculated from ... |
I understand the cyclic prefix, but in (1) it's said that: "If we consider that the channel effect is minimal and can be neglected. then the phase difference of the CP and the OFDM symbol which the victim of CFO can be found by $2\pi\beta N/N= 2\pi\beta$." and then, the author derives the equation for estimating the CF... |
I have got a video containing 200 frames and i am extracting low level features at pixel level. Then i am dividing the entire frame in to small spatial patches (say of size 7x7) and creating a feature vector for each spatial patch (by summing up the feature values of the pixel inside the particular patch). If i want to... |
In certain applications, you have enough SNR available to, for example, perform an FFT and identify peak location and hence the signal frequency. If my understanding is correct, parameter estimation techniques, such as maximum likelihood, will only be useful when your SNR is so low that you can't run a basic peak searc... |
I'm currently reading this paper: http://www.rssd.esa.int/SP/LISAPATHFINDER/docs/Data_Analysis/GH_FFT.pdf
On page 21, it has a section called "Putting it all together", it states the following steps:
Input data
Frequency resolution and length of DFT
Window function
Splitting of the data stream
FFT
Scaling
Now, the "W... |
Ok, so finally some things are making sense.
I'm trying to scale the results, which I have done by the following equation:
$$
PS_{rms} = \frac{2 \cdot \left |y _{m} \right |^{2}}{
S_{1}^{2}
} m = 0.....N/2
$$
Where $y_{m} = (re*re+im*im)$
This produces the following:
(Sorry about the axis - I have not had time... |
I'm trying to relate a near shore tidal signal (point A) to 3 points along a long model boundary (points B C D). I want to possibly have a relationship between B C D with which we can convert A predictions into B C and D. At the moment I'm doing a single phase shift, an amplitude ration for levels above zeros, an ampli... |
When I was studying dispersion of refraction index in semiconductors and dielectrics, my professor tried to explain that if a filter (like a dielectric absorbing some light frequencies, or an electric RC-filter) removes some frequencies, then the remaining ones must be phase shifted to compensate for those frequencies ... |
I would like to know what is the Compression Algorithm used by Facebook for compressing the images? I uploaded a image of size 242 Kb and I downloaded the same image from my Facebook album. The size of downloaded image is 46 Kb and the subjective quality is similar, I wasn't able to differentiate between the original (... |
I have just a quick question about how to calculate Deltas from MFCC. I have found the formula for calculating deltas here:
$$d_t=\frac{\sum_{n=1}^{N}n\left(c_{t+n}-c_{t-n}\right)}{2\sum_{n=1}^{N}n^2}$$
Another source states it is a regression equation. From what I can see, it takes coefficient from a previous and next... |
I am pursuing a master's in signal processing and I am working on object tracking. Till now I have done object tracking using colors, background subtraction and the Lucas-Kanade method along with a Kalman filter. For my final dissertation, I want to do something new on object tracking and I have explored a lot to get s... |
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