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The Fourier transform of $f(ax)$ is $\frac{1}{|a|}F(\frac{u}{|a|})$. So the frequencies are scaled horizontally but the magnitudes are also scaled when the graph of $f$ is scaled horizontally.
On the other hand the fourier series of $f(\theta)$ on $[-\pi,\pi]$ is $\sum_{-\infty}^{\infty} c_n e^{in\theta}$ whereas the f... |
I know I can multiply samples, then clip but perceived volume is non-linear for humans.
Can you please help with a formula.
|
My problem: create a device that can take a scan of a target via a camera and a shooting rig (that I am building).
The camera is connected to a motor that rotates the camera, and this is connected to a belt that translates left/right on a rail.
Diagram:
I leave the translation motor's speed alone and let it go fully f... |
Does anyone know of a filter to attenuate non-speech? I am writing speech recognition software and would like to filter out everything but human speech. This would include background noise, noise produced by a crappy microphone, or even background music. I have already implemented a first order filter that compensates ... |
Suppose that ${X_n; Y_n}$ is a random process with a discrete alphabet, that is, taking on values in a discrete set for $n$ data length. They correspond to the input and output of a communication process. Assuming Y to be the discretized output, what is meant by Shannon's source entropy for a given discretization bin $... |
I'm curious about the algorithm and basic principles behind Optical Character Recognition.
Can anyone explain:
The most basic OCR algorithm that can be fairly easily implemented from scratch? Or the common denominator between different OCR algorithms?
Extensions/changes made to tailor the algorithm for application sp... |
In 1d signal processing, many types of low pass filters are used. Gaussian filters are almost never used, though.
Why are they so popular in image processing applications? Are these filters a result of optimizing any criterion or are just ad hoc solution since image 'bandwidth' is usually not well defined.
|
Is an image a random variable, where each pixel is a realization of the same random variable? Or is an image a collection of random variables (if an image is of size mxn, there are mxn distinct random variables)?
In the latter case, are the RVs (pixels) considered i.i.d. (even though they are not)?
|
In case of Weighted Thresholded Histogram Equalization we use:-
calculate, the Weighted Probablity Density Function for Image using,
$$P_{wt}(k) = \left( \frac{P(k)-P_l}{P_u-P_l} \right)^r P_u$$
Where $P_u$ is the highest probability of a intensity in a Image.
$P_l$ is the lowest probability of a intensity in a ... |
Let $s_{\rm out}[n]$ be the 1D output signal of a system, $s[n]$ be the input, and $k[n,q]$ be the filter kernel for an element $n$ and for fixed value $q$. Then:
$s_{\rm out}[n] = s[n] \ast k[n,q]$
If I know $q$ as a real number, then I can compute the filter kernel $k[n,q]$ and determine $s[n]$.
The values for $q$ n... |
I want to be able to find points in images that are the centre of a radial gradient like the one shown in the left picture below. Any ideas on how I could use a Hough transform or some other computer vision method?
Thanks
example search image:
|
I'm thinking about ways to automatically identify and analyze lots of musical instrument samples, and would like to find the part of the sample that's the most stable in frequency, without any accidental vibrato or anything. My first thought was to do a sliding FFT and find the "width" of the peaks (maybe fitting a pa... |
I have been trying to understand what super-resolution is, in the context of DSP/DIP. What criteria is being maximized/minimized, and why?
Most of my online searches yield super-res techniques from the optical physics stand point, however I know anecdotally that they have been used in image processing, and in some dop... |
Possible Duplicate:
How is Weighted Thresholded Histogram Equalization different from Gamma Correction Image enhancement
In case of Weighted Thresholded Histogram Equalization we use:-
calculate, the Weighted Probablity Density Function for Image using,
Pwt(k) = ((P(k)-Pl)/(Pu-Pl))^r* Pu,
Where Pu is the highest pr... |
I am fairly new to DSP, and have done some research on possible filters for smoothing accelerometer data in python. An example of the type of data Ill be experiencing can be seen in the following image:
Essentially, I am looking for advice as to smooth this data to eventually convert it into velocity and displacement.... |
I'm relatively new to signal processing, so please excuse me if this is a trivial question. Why is the spectrum of a frame of speech samples periodic? What is the meaning of a periodic spectrum? And if a spectrum is periodic, doesn't that mean that it is not band-limited (i.e. it goes on to infinity)? How is the spectr... |
I am working on an audio dynamic range compressor using Matlab.
After calculating the FFT of the audio file, I use several bandpass filters to amplify specific bands separately.
What I want to do then is remove components of a band and put them in another band.
for example, remove the components of the band 8khz-10khz ... |
Hexagonal shaped Modulator is designed to get better BER than Square Modulator. The constellation diagram is like the figure:
It is supposed to give better BER measurement than Square as it has wider decision boundary. I have designed the modulator in this way.
Modulator for hexagonal
a2=[-2 -2 0 0 2 2 4 4];
a2=a2(:);... |
First of all, this is the first time I try to make a Kalman filter.
I earlier posted the follwoing question Filter out noise and variations from speed values on StackOverflow which describes the background for this post. This is a typical sample of values I'm trying to filter. They don't necessarily have to decrease wh... |
I am quite interested to know the significance of using kalman filter,unscented kalman filter and extended kalman filter in chaos synchronization when infact the very basics of chaos synchronization(physics perspective) never mentions about using kalman filter!However, these papers KF1 and alike use kalman filter for s... |
I made a terrible vocoder earlier and got some help on it here:
My vocoder sounds bad
My new implementation is much better. I'm using the band pass filter described in the document suggested on the old question. It seems to work much better, but the carrier wave is bleeding heavily into the output signal to the point w... |
I saw a video where this guy used a program to do a frequency analysis on a voice signal and a sawtooth wave (I'm assuming this was FFT). Then he saved the plots as images and combined them pixel by pixel through multiplication using photoshop. He then put this picture back into the program and it did the inverse trans... |
This question is regarding application of polyphase decimation filter in symbol time correction. How does choosing a perticular "polyphase branch" in a polyphase decimation filter result in timing adjustment ?
Suppose I have a 256:1 decimation filter with a sampling frequency of $256\textrm{ kHz}$ with total of $256\c... |
I am designing some Downsampling filters using the remez exchange algorithm (Matlab FDAtool). I see that some times i get a spike at the first and last coefficients. does anybody knows why is that? my intuition seems to be that this can introduce some artifacts to the signal..
What will be the consequance of multiplyin... |
I need help on understanding the linkage between Object Recognition and Content-based Image Retrieval. Does OR use CBIR to find similar objects with the help of algorithms like SIFT etc or does CBIR use OR to improve its results on finding images showing the same object?
CBIR could use color histograms to find similar ... |
I've been thinking of an algorithm for object recognition but it would relies heavily on straight non-noisy lines and as far as I know this is hard to obtain with edge detection algorithms. What's the best edge detection algorithm to obtain lines as straight as possible?
|
I checked the literature for recent algorithms used to design a digital filter that is a minimax approximation of a desired frequency response. All the articles I found work out examples where all the poles have magnitude less than 0.92, or less that 0.89, etc. I havn't seen a published example with a pole having magni... |
Is there some learnable segmentation or learnable edge detection algorithm exist?
For example I mark N fotos by hands and than program "learns" how to do it best way and can do it on similar images.
there are some papers on this subject or source code?
Update:
I found some inforamtion supervised edge detection \ superv... |
I've been attempting to work on signal transformation and filtering for the past few months. It's a bit difficult, but I've been making progress.
I was wondering if anyone had any simple examples to show loading in a wave file, editing the volume and frequencies of that file, and re-outputting it to a file? I've alrea... |
How to count blood cells in opencv? The problem is that they stick together.
The example picture :
Maybe pairwise geometric histogram (Geometric Histograms) suitable for matching partial circle shape?
|
I know this is signal dependent, but when facing a new noisy signal what is your bag of tricks for trying to denoise a signal while maintaining sharp transitions (e.g. so any sort of simple averaging, i.e. convolving with a gaussian, is out). I often find myself facing this question and don't feel like I know what I ou... |
I'm experimenting with decimating a signal, in this case a unit impulse.
I'm using Python, with pylab. First, I create a unit impulse, and decimate it by 5.
x = r_[zeros(0), 1, zeros(100)]
N = 2 ** 14
q = 5
y = decimate(x, q, ftype="fir")
subplot(211)
title("Original")
stem(range(len(x)), x)
subplot(212)
title("Decim... |
In this question, I would like to focus on intensity value of the CT Scan. First, take a look at the image below:
The upper image is the original image, while the lower image is the thresholded version. In order to measure volume of any shape, theoretically, it is possible to simply just count the number of voxels in ... |
I am trying to figure out the details on how to implement the 3D structure tensor in C/C++ in an easy but efficient way and need some advice!
For a discrete function $ I(x_i,y_j,z_k)$ the 3D structure tensor is given by:
$$ S=\begin{pmatrix}
W \ast I_x^2 & W \ast (I_xI_y) & W \ast (I_xI_z)\\
W \ast (I_xI_y) & W \ast I_... |
I'm making a Laser Harp.
The application needs the position of the hand along each of the laser beams to modulate a sound synthesis or modify the properties of a sampled instrument.
I'm wondering if doing a Color Tracking with OpenCV will do.
Make the beam visible with fog machine.
Segmenting the image for each beam.
... |
I am implementing a BFSK algorithm with frequency hopping on an embedded system and I am using the Goertezel algorithm in my demodulation approach. Basically, I use the goertzel alorithm to determine the powers of the signal at the next expected frequencies for both both bits 0 and 1 and whichever gives a higher power... |
I am working on a photo stitching application that uses multi-band blending. I need to get rid of unpleasant edges appearing at some places:
Here is the area of overlap (left - new image added to the mosaic, right - current mosaic contaning pixels of new image on background pixels to improve blending, middle - blendin... |
I am woking on an sound processing application where I have limited processing resources. I need to be able to detect acoustic feedback and then signal that such an event occurred. I am not concerned with the more complex task of feedback cancellation, in which the detection circuit would (presumably) need to output ac... |
In order to correct gradual changes of intensities in the background of grey-scales images, I have been blurring them and then subtracting the original images from the convolved one.
In some cases, I have seen improvement using median blur instead of blur.
I was therefore wondering if I could go further and use a filte... |
I've put together a multi-band audio EQ using biquad filters. I'm getting the coefficients using the methods from the RBJ cookbook.
Now I want to plot the curve showing the magnitude response. I'm using an equation from this source
Here is my function to get the coefficients and get the magnitude response at points o... |
I am measuring position and velocity, both have some noise in them. Velocity is defined as derivative of position. The system is apparently non-linear so I need to use EKF.
Model:
\begin{align}
X&=\begin{bmatrix}p\\v\end{bmatrix}\\
p_{k+1}&=A_0\sin\left(b_0k\right)+A_1\sin\left(b_1k\right)+A_2\sin\left(b_2k\right)\\
v_... |
[ Cross-posted from: https://math.stackexchange.com/questions/164169/estimating-the-input-to-a-system-from-a-system-state ]
I have a system for which I have obtained a non-linear time-varying state-space representation. For this system I am able to measure one of the states. I would like to estimate the input from this... |
I asked this at Stack Overflow, they told me to come here.
First, please excuse my ignorance in this field, I'm a programmer by trade but have been stuck in a situation a little beyond my expertise (in math and signals processing).
I have a Matlab script that I need to port to a C++ program (without compiling the matla... |
I need some face similarity metric.
I know about PCA,LDA approaches that uses raw pixels data, but they are not scale invariant(I know that I can resize image but I think that's not good solution).
Maybe I need to use AAM,ASM aproaches?
But I'm interested in metric that gives me the greatest separability of faces.
At f... |
I'm playing with the built in OpenNI access within OpenCV 2.4.0 and I'm trying to measure the distance between two points in the depth map. I've tried this so far:
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
using namespace cv;
usi... |
I want to detect textures on images, for example after proccessing on image must be shown areas of each texture and area where is no texture.And I want to compute "mean" texture of selected area.
how can I do that?
Update:
yes, I know that I can use some corelation technic with some small patches or just split whole i... |
I am implementing a BFSK frequency hopping system with TX and Rx modules. I am using Goertzel Algorithm at the receiver end to demodulate the data i.e. to determine the carrier frequency of the recevied signal data. Following is the implementation of the goertzel implementation:
float goertzel(int numSamples,int TARGET... |
I tried to use bessel filter from here,
but in the case of a large dataset, I have overshoot. Since I know a bessel filter shouldn't have overshoot, is this code wrong or am I doing something else wrong?
// Sample rate : 1e9
// Cut off Frequency : 50e6
int s=50000;
double[] sample = new double[s];
for(int i=s/2; i<s... |
Wondering if someone could offer me any advice or help. Sorry if this question is too broad or anything.
I'm wanting to complete an algorithm in basic Speech analysis. The algorithm will detect whether an inputted sample is either saying yes, or, saying no.
I know that this has already been done, and I got my inspirat... |
I am looking for an algorithm to measure attenuation of a discrete signal $s[t]$. Starting at the beginning of the signal sequence, is it possible to compute either sliding DFT or Gabor transform windows and use the amplitude and phase information to compute an attenuation coefficient? Is a reference available for su... |
Say there are 3 people in the room. Each of them have a unique voice timbre. I want to recognize people by their timbre and know who's speaking.
|
I've posted the same question on stackoverflow.com with little success, so I thought I would try here!
I'm using C++/C to perform forwards and reverse FFT on some data which is supposed to be the pulsed output of a laser.
The idea is to take the output, use a forward FFT to convert to the frequency domain, apply a line... |
Basically, (I know I've asked a simular question, but I have been away and really thought about it this time)!
Let me try and explain this in the best way possible:
Basically, I'm attempting to create an algorithm that takes a voice sample (.wav)
of someone saying either "Yes", or "No". Now, in order to do this I am a... |
I'm learning Kalman Filter for a week now. I just discovered that EKF (extended Kalman Filter) might be more appropriate for my case.
Le't suppose I'm applying KF/EKF for variometer (the device that tells planes and parachuters what's their vertical position and velocity). In my case I've generated some sample data: th... |
I have large database of pictures, about a few million.
I need an algorithm to find pictures which are similar to those in the database, up to a scale factor or a crop and shift (I have only these types of variations).
I know about histogram matching and perceptual hash, but is there a faster algorithm that exist for t... |
I was wondering if anyone knew anywhere I can obtain benchmark comparison of various algorithms used for similarity recognition. In my research I found one study from 2008 or so, but misplaced the URL.
|
I have a basic understanding of the acoustic preprocessing involved in speech recognition: divide the speech into frames, find the mel frequency cepstral coefficients of each frame, construct a feature vector from the MFCC's and signal energy, and compare the speech to several "prototype" speech samples to find the clo... |
I want to implement an on-the-fly training process for face detection. I'm not sure but it seems it's called online boosting.
Вefore, I have used OpenCV face detection with my own cascades, but I'm interested in technique which can "learn in process".
For example, If I train a boost classifer with 1000 marked images a... |
What techniques/algorithms can I use to remove noise from a raw recording of sound (voice)?
The purpose is to get a smoother graph (removing the "jaggedness"). What I have tried was to average-out small deviations by using the surrounding two values to either side, but ended up with distorted sound. What better way is... |
I am trying to transmit binary data from one device to another over an audio channel (speaker/mic). I use AFSK (Audio Frequency Shift Keying) as in Packet Radio, with $1200 \text{ Baud}$ and two frequencies $f_{mark} = 1200 \text{ Hz}$ and $f_{space} = 2200 \text{ Hz}$. I played around a bit in Ruby and my first implem... |
I'm trying to determine frequency of a repeating pattern in a time series. The sampling rate 100Hz and the pattern repeats itself with periods between 0.5 second and 1.25 second. This corresponds to a frequency range between 0.8Hz and 2Hz. At each second, I want to find the period of the pattern with 10msec precision, ... |
I have implemented a feature detector based on Harris corners. It works fine most times, but there are cases where it performs poorly. I need to make it work on many different images without configuring it individually.
The problem is with the detector threshold value. If set too low, the detector fires too many times ... |
I am very new to signal processing and my background is in physics. I would like to know if it is possible to determine the number of parity bits needs to theoretically get 100% transmission from a transmission channel with known percent error. Over a given transmission 25-30% of the transmission is incorrect.
Is i... |
What kind of bit error rate do they get from deep space communications (Pioneer, Voyager, et.al.), and what kind of modulation and FEC allows them to recover messages with that microscopic level of received signal power?
Are there more modern modulation methods and encoding schemes for similar channel conditions?
|
I have a mixture of Gaussians and I want to look at their power power spectrum. The spatial distribution looks like this:
It's already been convolved with a Gaussian window function. I subtract the mean over all values and run an FFT in matlab.
For the power spectrum I used $|\mathcal{F}|^2 $ and the image under is a... |
What algorithms are available for optimizing estimated bit clock recovery of an audio FSK modulated signal over an extremely low S/N ratio channel? (e.g. barely audible due to high ambient noise and low max available signal power)
Assume the audio signal is very long in duration and the payload is suitably pseudo-rando... |
I am developing an application that requires audio fingerprints. I have been reading a lot of articles and PDFs, now i think i have gotten myself confused. Based on my present understanding, I have some questions
After decoding the audio to its raw format, resampling and extracting the mono channel. Do i convert the ... |
The equation governing a leaky integrator (according to Wikipedia at least) is
$\frac{d\mathcal{O}}{dt} + A\mathcal{O}(t) = \mathcal{I}(t)$.
Is a continuous-time leaky integrator thus the same thing as a low pass filter with time-constant $A$, up to some scaling of the input?
|
Possible Duplicate:
Introduction to Statistical Signal Processing
Currently I am doing an (undergrad) class on statistical signal analysis, but I find the reader at hand (no book, buh) very hard to read and understand. The bad thing is, my professor did not include a read list of any kind, and this is not really a t... |
I am having a hard time trying to find documentation to implement band-pass or high-pass filter with python/scipy/numpy.
I can easily create and apply a low-pass filter, though, so I ask:
Would it be conceptually correct to low-pass-filter a signal, then subtract the result from the original signal, in order to get jus... |
In a typical Digital cable environment in the US, the spectrum is divided into 6MHz bands. When a tuner locks to a signal at say 800MHz, I would assume that the band for that signal is 797 - 803 MHz. The signal is QAM modulated. I would like to know why is that 6 MHz band required? If I can lock to a signal at 800MHz w... |
I use a combination of Visual Basic Programming interfaced with FAMOS which is a DSP software like MATLAB but much easier. I am trying to separate signals from a group, which requires filtering each signal. I used FFT and then IFFT on a 600s signal but the IFFT was longer than the original.
I don't understand if this c... |
In this paper or multirate filtering, the author establishes the following mathematical relationship. Let $y_D$ be the output of a downsampler such that
$$y_D[n] = x[Mn]$$
where $M$ is the downsampling factor. In other words, we keep every $M$-th sample of the original signal. The author then goes on to state the follo... |
I need a little bit more explanation on technical details regarding Fourier Transform in Image Processing, mainly on the frequency aspect.
I see that we can use Discrete Fourier Transform to change an image into a signal. From spatial domain to frequency. But from this definition, suppose I want to manipulate, let's sa... |
As stated in gagnon1997speckle in paragraph 2.2, under the unit-mean noise assumption one can say that:
\begin{equation}
ENL = \left(\frac{\bar{y}}{\sigma_{y}} \right)^2 = \frac{1}{\sigma_{n}^2}
\end{equation}
where
\begin{equation}
y = nx, \qquad \bar{y} = E[y]
\end{equation}
Can you help me to understand that asserti... |
If a signal undergoes repeated averaging (n times) with a filter (h) of size m. Is it possible to achieve the same averaging result with an averaging filter(H) of a larger size?
h = {1/m, 1/m... m times}
|
For a machine vision application, we take short duration (50uSec) monochrome pictures with IR flash. The images we get are decent quality however the light color subjects (light blue, light green, yellow) are all lost or become less visible.
We convert these 10 bit images to 8 bit and look at them that way which alrea... |
I'm working on a project which ranked some images based on quality.
For this project, I want to figure out the noise and the sharpness from a image.
To calculate the noise (from a CCD-Sensor) I think I can calculate the average noise from a image. How could I do this? I've read something about MSE, PSNR and SSIM. Ho... |
I am trying to detect a pitch in a narrow range of the audio spectrum with minimal samples. This corresponds to the rattling of certain mechanical systems. For example, the hum of an engine.
To do this, I am hoping to identify if there is a frequency at at a certain range such as 550hz-555hz.
I spoke with a learned fe... |
I'm a complete novice to digital signal processing, and I've started reading a few books on it. In particular, I've run across the concept of upsampling and downsampling. As I understand it, given a discrete time signal $x(n)$, upsampling transforms the signal by (essentially) inserting $L-1$ zeros between each sample... |
I'm working from an example posted here. I understand the steps to acquire the fourier transform and can clearly see the spikes at normalized frequencies at 15 and 40 Hz from the 0-centered periodogram. Knowing this, I believe that I can reconstruct a smoother version of the signal as:
$x_{\text{reconstructed}}(t)=\a... |
Possible Duplicate:
breaking the input signal into segments while calculating DFT
Im reading a book about DSP and there is an example about investigating the sound that travel through the ocean. The sound was recorded as the time-domain signal and they tried to analyze it in frequency domain.
The input signal was br... |
Im reading a book about DSP and there is an example about investigating the sound that travel through the ocean. The sound was recorded as the time-domain signal and they tried to analyze it in frequency domain.
The input signal was broke up into 256 point segments. Each of these segments is multiplied by the Hamming ... |
This post also contributes to the post at Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers by Jav_Rock (since I cannot add any comment there and I don't know why)
It can be seen that the translation vector 1x3 and rotation matrix 3x3 can be derived from homography matrix.
However, the followi... |
For which filters, does the resulting signal have the same integral (/average) as the original? Obviously this is true for a moving average, but is it also mathematically true for e.g. a Butterworth filter?
I am trying to build a lowpass filter for a signal of measurement samples. While there is a lot of noise, the ave... |
Consider a linear chirp signal, i.e. $f(t) = f_0 + kt$, where $f_0$ is the starting frequency, and $k$ is the chirp rate. After applying an FFT, how would I find the starting frequency and chirp rate?
|
I know very little DSP beyond an intro undergrad course. I was looking to write a C algorithm that takes ADC samples and determines if a specific frequency is present (in the range of 100KHz); not caring about any other components of the signal.
I'm not sure where to start. I looked at Goertzel algorithm; would this be... |
I'm trying to implement a software audio modem with FSK to transmit and receive short digital data between two devices (e.g. a PC and an iPhone) so I'm simulating simple cases study using Scilab/MATLAB.
While I can reconstruct the original signal when no noise nor background sound is present, problems arise when playin... |
I'm trying to process an 1D signal containing a waveform of 100000 pixel.
As it was acquired with a laser scanning system, and therefore it is corrupted by some annoying speckle noise.
I tried to prefilter it with a well-known type of non-linear image processing filter such as Lee and Kuan filters, obviously modified f... |
I've got a 1D signal (position of a servo motor over time) and I've extracted 'peaks'/'key' positions picking running average "local extrema" points.
Below is are 2 plots from 2 servos and the white markers indicate key positions I'd like to interpolate between:
I've played with linear interpolation, but the motion lo... |
I have read the description of the Kalman filter, but I am not clear on how it comes together in practice. It appears to be primarily targeted at mechanical or electrical systems since it wants linear state transitions and that it is not useful for anomaly detection or locating state transitions for the same reason (it... |
Sorry if this question seems to trivial, but I am a bit of a novice when it comes to signal and image processing and I need some guidance.
I have a 3D stack of about 256 grey scale images, each with pixel resolution 256x256, coming from an x-ray tomography scan of a rock sample. I want to segment the data to isolate... |
When we plot FFT in a matlab it doesn't ask for Frequency , all we need to input the sequence and it simply shows the output using stem command.
If i want to compute two different signal using FFT, one with High and the other with Low frequency what should i suppose to do ?
and what will be the difference between the t... |
I am trying to implement a binary offset carrier (BOC) direct sequence spread spectrum scheme in MATLAB. In that scheme, a code $c(t)$ (a binary vector which repeats after a certain number of zeros and ones) should be calculated by an other square (sub) carrier of the following form sign(sin(1*pi*fs*t) where fs is the ... |
I'm trying to test the specgram function located in the signal package in octave but I'm a little confused at the variables in specgram. What I would like to do is be able to get the specgram data into an array that will show the frequency and the length of time when the frequency starts and stops.
See example code b... |
Possible Duplicate:
What does frequency domain denote in case of images?
If we look deeply into Digital Images they are purely generated by the pixels distributed in rows and coloumn and the pixel consists of number of certain bits which define the complete Image.
Then what is the role of Frequency in generating Dig... |
I am new to Digital Signal Processing, and am reading a paper. I don't know how they can extract some features from signal, like root mean square (RMS), Constant False Alarm Rate - CFAR, Mean Value Dispersion Statistic – MVD, Ratio of Power – ROP, and Autocorrelation from a signal, as shown in the following figure:
Co... |
What would happen if you took the STFT of a signal, discarded the phase information, and re-synthesized it? For example, just modulate oscillators tuned to each frequency bin by the amplitudes for those bins and add all of the results together for the output. Could human ears detect much of a difference? Would it make ... |
When i looked in to the algorithm of Salt n Pepper noise in a Matlab i've found this,
case 'salt & pepper' % Salt & pepper noise
b = a;
x = rand(sizeA);
d = find(x < p3/2);
b(d) = 0; % Minimum value
d = find(x >= p3/2 & x < p3);
b(d) = 1; % Maximum (saturated) value
Which i simplified as this,
... |
I have the measurements of a filter’s Group delay and S-parameters.
The S-parameters are of the following form, presented in a touchstone file.
!Agilent Technologies,N5242A,MY49421489,A.09.33.09
!Agilent N5242A: A.09.33.09
Date: Thursday, March 22, 2012 19:50:06
!Correction: S11(Full 2 Port(1,2))
!S21(Full 2 ... |
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