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I am working in the field of digital image restoration. I have images that are degraded by camera shake. My images are similar to this blurry photo from camera shake. Can anyone please suggest a better non-blind deconvolution algorithm?
I have already checked some of the blind deconvolution algorithms such as Dilip Kri... |
The steps of computing the Mel-Frequency Cepstrum Coefficients (MFCC) are:
Frame blocking -> Windowing-> abs(DFT) -> Mel filter bank-> Sum coefficients for each filter-> Logarithm -> DCT
But what is the purpose of the logarithm step?
|
I have some data sets on which I applied Gaussian smoothing using [1 4 6 4 1] kernel. In my program I iterated this kernel 50 times on the data sets. But only a few of them could retain their shape, most of them just flattened and lost all the patterns
I want to know is there any way I can estimate the number of iterat... |
How to calculate auto-correlation of a bpsk modulated signal, or how to calculate expectation value of complex exponential function manually not by using matlab or any other software?
For example, if
$$x(t)= a\exp(i2\pi ft)+n(t)$$
how would you solve
$$\mathrm{E}[x(t)]=?$$
and
$$R(t,t_1)= \mathrm{E}[x(t+t_1/2)x'(t-t_... |
I have successfully tested 1D phase correlation algorithm to determine vertical shift between two synthetic images.
When I moved to real images, however, it is not able to detect translation at all (the peak is located at 0, which is wrong result).
I have the following images:
And resulting phase correlation (Magnitu... |
I have a noisy signal with frequency between 1/3 and 1/5 of the sampling window.
DFT has a very low resolution for low frequency components, what is the best way to find the frequence?
|
When I recreate a signal it seems to look great. But when I try and increase it's frequency (which is done in a for loop and the variable new_freq=2) it starts to drift.
See Image below (The top image is 1hz and the bottom image is 2hz. I circled the image with the problem). I also noticed when I increase the sample f... |
I have a signal that it is like a Sinusoidal signal with many local maximum, I want to smooth this signal with almost connecting it's local maximum to each other.
|
Hey guys, what is the difference between b.) and c.)? Why do we need each of them?
Excrept from: http://www.dspguide.com/ch8/5.htm (scroll below)
|
How did letter d.) become letter e.)? How do we perform this averaging process? Its clear the averaging the signal causes some noise to be reduced.
|
I am working in digital image restoration field and i have studied this is many research papers that presence of saturated pixels violates the assumption which is initially assumed by many blind deconvolution algorithms, that the image formation process is linear...
Can anyone please explain that how this rule is viola... |
Given a list of overtones (F1, F2, F3, etc), how do I compute the fundamental frequency? Can I do something like F2/F1=F1/F0? Is it the correct method to use?
|
I have a wav file recorded from my smartphone's mic, and I want to reconstruct the sampled signal and plot the reconstructed signal. After some research and search, I was able to get the following code:
[y, fs, nb] = wavread('new.wav');
x=[1:1:length(y)];
z = y(:,[1]);
samp=transpose(z);
b = 48000/fs;
% Quantizing the... |
I read this lecture on using PCA/eigenfaces: http://www.cse.psu.edu/~rcollins/CSE486/lecture32.pdf
And I want to use this general procedure to recognize a 3D clay model that I took pictures of from multiple angles.
I'm having trouble conceptualizing how it's actually implemented in software. I've "trained" the initial ... |
I am sampling a signal at 1kHz, which is essentially a single-frequency sinusoid with a DC offset (and a small amount of noise). I don't know the precise frequency of the sinusoid (it is at most 10Hz), and I want to record the mean value of the signal.
Currently I take samples for an arbitrary number of seconds and fin... |
Assume a camera has no skew, and has square pixels, that is, its camera-calibration matrix, $K$, looks like:
$$
K = \left[\begin{matrix} \alpha&0&u_x\\0&\alpha&u_y\\0&0&1 \end{matrix}\right]
$$
Intuitively, it seems that it should be possible to recover the pose of a rectangular planar object, $P$, (for example a flat ... |
I would like to ask about smoothing data by using Kalman filter. Due to quantization, I have data that is not smooth. How can I smooth this data by using Kalman Filter. For your information, the data is not constant and have some gradient.
|
I am confused while writing code to implement Fisher’s F-ratio.
Suppose I have 4 speakers, each speaker pronounces 2 words and each word has 3 frames and each frame has 30 sub-bands.
$u$ is mean of all speakers.
Suppose $x_{ij}$ is one sub-band energy of the $j$th speech frame of
speaker $i$ with $j= 1\ldots N$, and $i... |
I am trying to find the three cervical vertebrae (C2 , C3 , C4)in x-ray videos (gray images)
I am using SURF to identify the place that has these 3 vertebrae (big box for all of them )
SURF gives me good result in this case
Now I am trying to identify each one of these vertebrae from this big box, but SURF failed in t... |
I was asked this question and couldn't come up with an answer on the spot which didn't involve the frequency domain (basically that the co-efficients of the delay sequence are the impulse response of a FIR filter).
Does anyone have any insight which makes this process 'obvious'?
|
I thought that DSP would be done by using FFT of portions of a signal, modify the samples that result from FFT (since they represent the spectrum of our signal + noise) and remove any unwanted signals and than do an inverse FFT to get a time domain representation of the filtered signal (noise has been removed now). Thi... |
I am trying to understand the LidarBoost algorithm as explained in this paper (PDF warning).
I don't understand how they take the original depth-images $Y_k$ and transform them into the up-sampled images $D_k$. I get how optical flow is used to align the $Y_k$ into a chosen reference frame, but is the transform betwee... |
If I record a sound at a rate of 8000 samples per second I know that the highest frequency that can be reproduced from the sound is 4000 Hz. What I want to know is;
If the sound contains frequencies above 4000 Hz when I play the sound
back what would I hear and what frequencies would be produced at the
points wher... |
I am trying to implement OFDM on gnuradio. I have two questions.
The sampling frequency which is slightly higher than available bandwidth satisfies Nyqvist criterion for complex baseband signals. So why do we need to add oversampling factor again? Suppose say oversampling factor is 2. How does that help us in recover... |
I extracted sift feature to construct a bag-of-words model. I did the following to extract the feature vector:
Extracted features from the key frames.
After the feature extraction I tried using Principle Component Analysis to reduce the size of my features.
Query: What further pre-processing steps should I take befor... |
Consider a filter which tracks $x_i$, clipping $|x_i - x_{i-1}| >$ some limit, say 1:
in: 0 1 2 10 0 0 10 10 10 0 0 0 0
out: 0 1 2 3 2 1 2 3 4 3 2 1 0 -- |delta| <= 1
(in Python with Numpy: cumsum( clip( diff( x ), - limit, limit ))
Can anyone point me to a description of such filters,
either in theory o... |
I'm new to Matlab/Simulink and would like to convert the continuous system below to discrete for eventual conversion to C code. Matlab has a c2d function, but I don't know how to apply it to a simulink system. The c2d function requires the system to be in transfer function or state-space form, neither of which I know ... |
I am working for my class project on making animal repellent , I need to know how I could go about taking a normal audio file and shift its frequency/Pitch very high to make it an ultrasonic sound.
|
I am learning about the Discrete Cosine Transform (DCT) and I read somewhere that, in general, images have very few high frequency components. Can someone give me an intuitive explanation for why this is so? Is this assumption violated in any scenario?
|
I have a signal that was recorded with around 300 samples in a second. Now I want to run a low pass and a high pass butterworth filter over it. The frequency for the high pass filter is around 0.05 Hz and the one for the low pass around 5 Hz.
But how can I decide which order my butterworth filters should have? Is there... |
This is a classical image segmentation problem: I need to make a visual measurement of particles.
I've been using watershed, kmeans and mean shift but it doesn't work well on this image. Could you please recommend me some other methods/open source code?
P/S: Any manual/semi automatic segmentation is also ok with me. I ... |
How can I calculate the (black body equivalent) color temperature of the light source illuminating a given image? Below are screenshots of Adobe Lightroom manipulating color temperature and a shift in the RGB Histograms. Given RGB components of the image, how do I go about calculating it? I should expect a single value... |
Why do we need to flip the kernel in 2D convolution in the first place?
What's the benefit of this?
So, why can't we leave it unflipped? What kind of terrible thing can happen if you don't flip it?
SEE:
"First, flip the kernel, which is the shaded box, in both horizontal and vertical direction"
http://www.songho.ca/dsp... |
So I am working on a project using digital signal processing, which I am not familiar with at all, and a lot of this is all new to me. I am using SciPy\NumPy to play around with code to understand the Fourier Transform. Basically, I have been able to read in a wave file and perform an FFT on the data using the followi... |
Suppose there is a distribution that has values sampled on the interval 1-25 with corresponding sample values that have to be smoothed. For example:
n f[n]
3 123
5 234
8 246
10 567
14 253
18 251
24 132
The first column has sample points between 1-25 but does not have samples for all points on the ... |
i am working in digital image restoration field, i am familiar with java and i want to use java in image restoration, can any please suggest me any book or tutorials where i can learn about image restoration using java.
I have already checked this java tutorial
|
I am doing some massive number crunching in MATLAB which involves millions of PSD estimations. Each data segment has length 41. So I have been using the multi-taper method with nfft=41 (details below in the code). My last simulation took more than eight hours. The code is optimized and vectorized as I can make it so I ... |
I've sampled a propagating wave so that I know its amplitude at several equidistant points on a line, and at several points in time. That is, I have this discrete function:
f[t,x]
Now, I want to find the frequency of the wave. But there seems to be two frequencies I can calculate: by finding the FFT at different point... |
I know there's a benefit of knowing the Fourier Transform for image processing, but is there a benefit to know Fourier series, or could you just skip them? Would you recommend skipping Fourier series or would that make it too abstract? What's your opinion on this?
|
I'm modulating a message with particular baudrate, say 2MHz using BPSK , Carrier frequency(Fc) is 8MHz, What should be appropriate Sampling Frequency(Fs) following Nyquist criteria, Should it be greater than 2*(2*baudrate) or 2*(Fc+baudrate)?
|
Wikipedia lists a number of different FFT algorithms:
Cooley–Tukey FFT algorithm, Prime-factor FFT algorithm, Bruun's FFT algorithm, Rader's FFT algorithm, and Bluestein's FFT algorithm
What are the pros and cons of each algorithms? (think about: computational expense, parallelizability, ease of implementation, etc.)
A... |
I need to smooth some data segments and one of the techniques I am experimenting is a low-pass filter. So I designed a low-pass filter in matlab and applied it to my signals. Here is what happened with two of them.
Panel A is one of the data segments plotted with its filtered signal. It looks good. This is what I expe... |
I have a small 2D Gaussian image filter that I am currently applying as a window by convolution. I would like to do this in the Fourier domain as a single multiplication. I would like to convert my current small filter to the Fourier domain as it is with maximum possible fidelity.
I do not know the size of the image th... |
I am going through an old exam paper and trying to understand this question where they ask us to tell them what effect the following image filter would have if its convolved with an image:
0 0 0 0 1 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
... |
Can you help me (show me how) to solve the following exercise?
For the process with transfer function $G(s)=e^{-2s}/(s+1)$ design a digital controller with sampling time $T_{s} = 1$ that meets the specifications:
$e_{∞}$ (steady state error) null whit a step as input;
dominant poles in closed loop with damping $ζ≥0,5$... |
I am trying to understand how image processing is applied for detection of cancer tumor using image processing. Towards this direction I am trying to get latest information i.e state of the art in this area. I found one book titled
"Image-Processing Techniques for Tumor Detection"
But this is more than 10 years old an... |
I have a degree in Electrical Engineering (focusing on VLSI). However, I am more mathematically minded, and only recently discovered that image processing seems to contain lots of interesting maths. I am looking to break into this field in a about a year or so in spite of not having any formal experience in this area. ... |
This link contains the following statement:
In contrast to the frequency domain, it is possible to implement non-linear filters in the spatial domain. In this case, the summations in the convolution function are replaced with some kind of non-linear operator.
Why is it not possible to perform non-linear filtering in ... |
Update 8
Unhappy of having to upload tracks to the service and looking at the new release of RekordBox 3 I've decided to take another look for an offline approach and a finer resolution :D
Sounds promising though still in a very alpha state:
Johnick - Good Time
Note that there's no logarithmic scale nor palette tunin... |
According to this page, the Baudline software tool implements
...the uHz-rotator algorithm that operates in the complex domain to
calculate an extremely accurate estimate of the frequency.
Furthermore
Under good conditions (strong signal and low noise) the frequency
accuracy can exceed 8 significant digits (~.00... |
I have a feedback loop with transfer $L(z)= \frac{H(z)C(z)}{1+H(z)C(z)}$.
$$H(z) = h\quad \text{and} \quad C(z) = \frac{K}{z-\alpha}.$$
If I manually calculate the transfer function, I get:
$$L(z) = \frac{Kh}{z-\alpha + Kh}$$
But if I let MATLAB do the calculation I get:
$$L(z) = \frac{z-\alpha}{z-\alpha}\frac{Kh}{z-\a... |
Can any one suggest me a Bandpass filter in java which I would like to apply on generated sine wave of a particular frequency
|
For OFDM synchronisation, we are using two training symbols according to the Schmidl and Cox method of frequency synchronization and timing synchronization. The paper says:
The first OFDM training symbol has only even numbered subcarriers applying a PN sequence.The result is two identical half symbols in time domain e... |
Is it possible to break out the i and q of a complex WiFi signal? If I have a laptop with a standard WiFi card in it, could I break out the i and q in analog, or upon sampling in an FPGA via digital means?
It must be possible since it is being done on a WiFi receiver, right?
|
I am creating a system (modulator and demodulator) for broadcasting binary data through an analog signal. I'm using BPSK with great success – at least, I'm generating great graphs.
Green is input signal, red is carrier phase, pink is digital zeroes and ones.
My question is – now that I have that pink stream of binary ... |
The following binary maps are the results of a measurement I've carried out. I'm looking for a quantifiable measure of the red areas. I could trace rectangles manually (the green rectangle on the upper-right image), but it's hard to motivate their shapes.
Is there a natural (and well-used) method to detect the shapes ... |
Using a signal of three joined sinus of equal length at different frequencies (40 Hz, 50 Hz, 80 Hz) I calculate a scalogram of it (scale vertical, time horizontal, The steps of variing the scale parameter are equidistant):
Plot of the Scalogram:
In contrast to my expection that lower frequencies (i.e. higher values f... |
We know that DFT (discrete Fourier transform) breaks down a signal into multiple frequencies of sine waves. Does there exist a transform that does the same thing, but for triangle waves?
For my purposes, im only talking about 1-d signals (like voltages, etc). I'm studying historical stock market data, and I just want t... |
I'm writing a C++ application to extract four modulated carrier signals at four separate frequencies, from a single input signal. I've designed four FIR filters at t-filter.appspot.com but they run very slowly, even when I reduce # of taps to 80.
Is there a better option? People seem to point to biquad filters – are th... |
In a baseband complex signal, I need to generate a BSPK modulated signal at a given frequency. If I generate a CW at this frequency, all is good. However, when I then BPSK modulate the CW, I get a signal at both the positive and negative frequencies.
Is there a way of implementing BPSK modulation without this negativ... |
I was wondering if anyone had run into the problem of trying to estimate errors in their signal processing on spectroscopic data. I know that many people use spectroscopic techniques to estimate concentrations of different materials, but I would like to know how accurate these measurements can be (i.e. I would like to... |
EDIT
The first version of my question has not worked as I expected, so that I will try to be a little bit more specific.
The final goal I am trying to achieve is the generation of a ten minutes time series: to achieve this I have to perform an FFT operation, and it's the point I have been stumbling upon.
Generally the ... |
This may be a very straightforward question but I've been trying to understand this for a long time and can't wrap my head around it.
How would one go about discretizing the following continuous time signal:
signal_continuous = 1/6 * sin(880*pi*t) + 1/15*sin(1760*pi*t);
As far as I understand, if I wanted to sample th... |
I am working on a image processing application which uses a discrete fourier transform to implement blurring/sharpening. The application is more or less working, but something about the mechanics is still confusing to me.
In particular, it is how the process of centering the zero frequencies is being done.
The exampl... |
Suppose I have a $4x4$ image with the following values as its grey-level intensity for each pixel like this:
I want to get its Fourier spectrum. Usually, I would just punch into Matlab and run a fft for everything to be calculated automatically. Now, if I don't have Matlab, and I have to do it by hand and with just an... |
I am looking for theory on whether compressed sensing reconstruction via ℓ1-minimization is unique and under which conditions.
I have looked through:
Tropp, J. A., "Just relax: convex programming methods for identifying sparse signals in noise," IEEE Transactions on Information Theory, 2006, 52, 1030-1051.
This pape... |
What is the meaning of $Ta_k$ of fourier series or transform?
I am taking a course on signal and systems.
In 286 page of my textbook, it says that as T becomes arbitrarily large the original periodic square wave approaches a rectangular pulse.
Also it says that all that remains in the time domain is an aperiodic signal... |
i have to estimate a process which changes over time, not with respect to the system-evolution or the measurement-function, but regarding the number of objects that have to be estimated. So every iteration I have to estimate e.g. 5 more state variables of a new object. Do you know method to do this with a Kalman or Par... |
I'm trying to remove noise from an audio file. This audio file contains speech as well as constant pink noise. I know that I have to use the Fourier transform to convert to the frequency domain then use a filter to filter out the frequencies of the pink noise, but I really don't know where to start with that. It also s... |
Before anyone yells at me I fully realize that this question has been asked numerous times. I assure you that I've read through the existing questions and answers but I am still confused about part of the problem.
I have a sound source that plays music (A) in a closed environment. I have a mic that I'm using to record... |
I'm writing an app that recognizes Sudoku puzzles from a camera input. I'd like to remove camera blur from the images to improve recognition. Here is an example image:
Since I'm processing a continuous camera feed, I'm concerned about speed, since slow algorithms will degrade my frame rate. On the other hand, the t... |
We're trying to implement a "simple" speech recognition application in MATLAB (isolated words from a very limited dictionary). We've been trying the following methods:
Extract MFCC coefficients for each frame of the word, and then compare to templates that we have recorded previously using DTW, and take the template t... |
I want to ask about this scheme:
$u_0$ should be something as input in specific point given by the initial conditions and $y_0$ output. Block State Spase represented linearized system by A, B, C, D state metrices.
And I'm wondering why there is "-" by $u_0$ and "+" by $y_0$. Is this scheme universal? Why does it look ... |
It is well known that the DFT can be interpreted as a filter bank. The same can be done for the DCT, for instance Fig. 3.29, pag. 129 in [1] shows a plot of the frequency response of a DCT filter bank. I am wondering how this plot (and similar plots for other transforms like DST, etc.) was obtained. For the DFT, we hav... |
I am having trouble with zero-padding. As I understand it, in theory, zero-padding in the time-domain should 'sinc-interpolate' the FFT of the signal in the frequency domain.
This would mean, that 1) none of the values of the original signal change. 2) the overall profile of the FFT doesnt change- aka the peaks remain... |
I am working in digital image processing field, i have set of mammogram images in .bmp format, when i am opening anyone image using MATLAB then i am getting intensity value as 0 for a particular location (i,j), but when i am opening this image from java program using BufferedImage then i am getting intensity value as 5... |
I have a block of audio and I have performed an FFT on it. Now what I want to do is convert this FFT into a set of MFCCs, however while I know I need to do something with weighting the FFT samples based upon a set f triangular filters I haven't really got a clue what this involves.
Can anyone go into some good detail ... |
Is there any way to control per-pixel contrast? E.g., a way to set an upper or lower limit on the contrast between pixels?
The closest thing I've found is a high-pass filter of an n-pixel radius, inverted and applied as an overlay layer in Photoshop. Other kinds of filters, such as median, blurs, and traditional contra... |
I started studying DSP and the first things that came out were the differences between continuous and discrete time signals. So, I was wondering if I understood well these concepts before I keep going into more difficult topics.
The first thing I realized is that discrete-time signals replace the continuous parameter $... |
I have a question about matched filtering. Does the matched filter maximise the SNR at the moment of decision only? As far as I understand, if you put, say, NRZ through a matched filter, the SNR will be maximised at the decision point only and that is the advantage of the matched filter. Does it maximise the SNR any... |
I have a question concerning BPSK and the bandpass filter that seems to be sometimes placed before the receiver circuit (the receiver is a mixer and lowpass filter).
Basically, from what I've noticed, there is sometimes a bandpass filter before the receiver of BPSK (and other types of receivers too I think). Is the on... |
I'm trying to find out why digital systems are stable iff poles oh their transfer function are inside the unit circle (or are there any others conditions?).
I understand analogous systems are stable iff all poles of their transfer function are negative 'cause of inverse Laplace transform, where $\mathcal{L}^{-1} \left ... |
I've been sent here from this question in stackoverflow, please excuse me if the question comes too specific and it's not in the manners in here:)
The task is to find a glass with specific liquid in it. Let me show you the pictures and then describe what i'm trying to achieve and how i was trying to achieve so far in t... |
I have as a homework to determine the line rate and frame rate for a system described above:
Heigh of monitor: 40cm
Screen Aspect Ratio: 16:9
Pixel Aspect Ratio: 4:3
Progressive scan
Viewing distance from screen: 0.6m
Active line period: 15μs
Horizontal Blanking: 5μs
... |
I would like to ask, cuz I don't know much from that, how we can find the BER at a GSM network (uplink & downlink separately of course), while we are using FSK modulation? I mean the equations precisely, cuz I searched the Internet and there's nothing clear. Most cases where about MFSK, QFSK etc., but not specific for ... |
I've been trying to do some research on audio watermarking and what i wanted is to insert string into audio file in the transform domain (DWT), i've read some literature of DWT especially HAAR transform and try to implement it. So far i can embedd and extract watermark from the audio which is wav file beacuse i followi... |
I have these values,
m2 = 1 -1 -1 1
w2 =-1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1
Im about to multiply m2 with w2
Should i multiply m2 with all of w2
(1 * -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1)
(-1 * -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1)
(-1 * -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1... |
I'm an electronics engineering student with high inclination to analysis and pure mathematics. I was just wondering if there was any book ( or any resource ) that treats signal and systems and signal processing with a lot of mathematics rigour ( actually doing proper complex analysis, using functional analysis and lin... |
I'm trying to intuitively understand why a windowing function of a signal is a low-pass filter.
I know its DTFT is a sinc function, making it mathematically a low-pass filter, but my logic says truncating a signal with a windowing function would preserve high frequencies better than low frequencies, since high frequenc... |
I'm processing audio data for voice input from a mic. The data arrives in 32 bit floats [-1 ~ +1].
My first filter is to remove DC:
// x = new input value, y = filtered output value
m_x += ( 0.01 * ( x - m_x ) );
y = ( x - m_x );
When I feed it audio that is close to clipping (but not actually hitting -1 or +1), I'll... |
I'm sure there must be an easy way to do this, but given the Fourier transform of an isotropic filter kernel, $\hat{f}(\mathbf{u}) = \mathcal{F}f(\mathbf{z})$, can one calculate the value of the kernel at $\mathbf{z} = 0$?
|
I have a image and I want calculate fft2 of it, after it I want recover image only by magnitude of it. how can I achieve this work?
I=imread('1.bmp');
I = rgb2gray(I);
imafft = fft2(double(I));
% Gets magnitude and phase.
mag = abs(imafft);
% Generates the modified spectrum
newfft = mag.*exp(0*angle(imafft));
im... |
I'm pretty new on signal processing and I've been reading a lot the last days in order to understand a little about it. But still there are things that I'm not sure if I got well. Sorry if I don't use the terms well.
I'm developing an application that detects onsets using a frequency spectrum, using KissFFT. Basically ... |
Here we have the basic formula of a Proportional Integral Derivative controller. This is the formula from the Wikipedia page on the subject
I want to implement this type of controller in my system. Currently the system (function in the software) is fed a psi value and told to set an analog output to a value so that th... |
I have a discrete function that represents a 1d position in space over time. I have a motion system that would like to achieve this curve, but, due to constraints on jerk (3rd derivative) and acceleration (2nd derivative), it cannot actually achieve the motion. This occurs due to a discontinuity in the function, wher... |
I am software engineer studying DSP on my own. I came across this question in a graduate textbook and am not sure how to proceed.
Determine the frequency response for the filter:
H(z) = 1.5 / (1 + 3z^-1)
Clearly, this is a z-domain transfer function. How do I get the frequency response? I am thinking of converting it ... |
Take the simple frequency-domain band-pass filtering operation below . . .
NFFT = 128;
x = randn(NFFT,1);
H = zeros(NFFT,1);
H(10:20) = 1;
y = ifft(H.*fft(x), 'symmetric');
This gives a real output because I'm using the conjugate symmetric flag to the ifft operation.
I want a function that returns the conjugate symmet... |
I want to calculate the total bit rate of a video system.
In order to calculate the total bit rate for a 1080/50p video system(4:2:2) we need:
• Luminance sampling rate:Fs=13.5MHz (standard for 4:2:2)
• Number of bits: N=8
• Number of components per PEL: M=3 (Y,Cb,Cr)
• Number of lines: L=1080
• Line durat... |
I have to use image processing for quality control of a cookie manufacturer (as a part of my project). The program must be able to detect oversized, undersized, distorted cookies, cookies having cracks, etc. I am new to opencv. Can you please suggest which all functions would help me?
|
What does $|H(j\omega)|^2$ in $20 \log_{10}|H(j\omega)|$ mean?
Is it some ratio of energy or power? And why? How to derive it?
I'm sorry for curtness of my questin.
|
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