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Is there any instance where Fourier transforms of color images have been used in conjunction with other object recognition method?
Any instance of usage of Fourier transforms in color images? I think there is great potential in the usage of Fourier transforms of color images.
|
I am working on a sinusoidal encoder & decoder to compress .wav files. For now I am trying to regenerate the audio by combining all the frequencies of the original .wav file.
Here is the code I am using:
[x fs] = wavread('clip.wav');
x = mean(x,2);
NFFT = 1024;
hop = NFFT/2;
win = hann(NFFT);
[S F]= spectrogram(x, w... |
I am looking to develop an Android app. As part of the functionality the app would require to randomly sample 3-5 seconds of audio and classify it as containing human speech or not. I understand that this concept is called Voice Activity Detection?
What would be the best way to implement this on a Mobile phone. I devel... |
Which audio features should be used to detect tone from audio? Are there any open source frameworks or implementations which can be ported to mobile phones to process audio?
Alternatively, would it be possible to collect audio features from the phone and then process this on the server so as to detect tone?
|
I am constructing a MFCC and come to a section which is kind of confusing me.
It is:
Step 4: Fast Fourier Transform
and has this equation:
Now I understand that FFT needs to be carried out, I just don't understand where the values are meant for:
h(t)
x(t)
H(w)
x(w)
Up to now, I have:
Inputted the raw signal (vector)... |
I am feeding the samples of pure sin wave to the audio DAC, I would like to create an echo effect. What I am not sure is how to go about it.
I was thinking about superimposing the the current buffer that I am feeding with the delayed version of it with some decaying factor but that does not seem to help at all. I am us... |
I'm trying to understand how to find the coefficients a-h for inverse mapping,
my goal is to program projective transform from scratch.
let assume i have user input 4 coords entered clockwise onto imageA and i want to map imageB.
imageA is 300X300 and imageA is 256X256.
function [ result ] = findCoefficients( imageA, i... |
I'm currently working with audio signals and have a problem:
C = A*B + N, where
C = recorded signal from microphone consisting of:
A = known music file data played on speakers next to microphone
B = some convolution on the recorded A-sound due to speaker->mic roundtrip
(I mean the recorded signal won't be 100% the ... |
the question below asked in my latest signal processing exam. I have no idea about it and i could not find any solution in literature. Could you please help me finding out the answer. Actually i believe that i am quite good at signal processing until this question.
A voltage signal is sampled digitally in the laborator... |
So I'm trying to write a frequency-domain interpolator that zero-pads the frequency response of a signal and inverse transforms. There's two cases I have to deal with:
Even-length response - have to split the $F_s/2$ bin because it's ambiguous. So I copy the negative part of the spectrum, and add n*(interp-1)-1 zero... |
I am trying to decipher a message hidden within a very noisy audio file(.wav)(I think it is white noise with an additional low drone). The message is a six digit number. I have not have any further details about the noise.
I attempted to use a low-pass filter in the hopes that eliminating most of the higher frequencie... |
I'm totally stuck on an issue regarding the segmentation of glassy objects.
I need to get the object as precise as possible.
My approaches were different.
At first I tried to remove the background, so that only some sharp contours are left.
But that only works for objects which have sharp edges / gradients.
Otherwise t... |
I'm trying to generate a buzzer sound like this one in matlab.
When you look at the waveform, it's got sinusoidal notches cut into an otherwise normal looking sinewave.
I generate a sinewave tone,
fs = 44100 ;
t = 0 : (1/fs) : 2 ;
f = 200 ;
y = 0.5*(sin( f*2*pi*t )) ;
sound( y, fs ) ;
I don't know how to cut the not... |
I'm trying to understand a piece of code that is using a camera projection matrix. The camera projection matrix $P = \left[\begin{array}{c}p_1^T \\ p_2^T \\ p_3^T\end{array}\right]$ takes a point $X$ in 3D world coordinates and projects it onto pixel coordinates $x$ of an image. It is a $3 \times 4$ matrix. The 3rd row... |
Is there a way to generate a waveform from data (any kind of data: integer, hexadecimal, string, char, binary), in a common audio player, without converting the data to an audio format?
I'm looking for a way to "code" an arbitrary file in to audio (obtain an audio-descriptor of the data).
|
I am specifically working on a categorical time series of best n number of parallel threads (for n=1..16) for a multicore workstation. I constructed the Walsh-Fourier periodogram for size 2^10 and 2^11 data points. Both of the images are with the first value removed to allow a scaled image. The difference is dramatic a... |
I'm looking for a method for scale and rotation invariant Template matching. I already tried some, but they didn't work so good for my examples or took for ever to execute
.
SIFT and SURF Feature detection failed totally. I also tried to implement a Log-Polar Template Matching function, but I never finished (didn't kno... |
b = [0.9355,-3.6135,5.3603,-3.6135,0.9355]
a = [1,-3.7339,5.3562,-3.4929,0.8752]
Use MATLAB to quantize the coefficients in the vectors a and b to 16 bits of precision. First, take each vector and divide by the smallest power of two such that, after division, the magnitude of the largest filter coefficient is no large... |
I have a bunch of audio files all sampled at 44100 Hz sample frequency. I am trying to remove all the frequencies which are outside the human hearing range (I use the following as reference: Frequency Range of Human Hearing, as well as robert.b's answer for determining the frequency value of a given bin: How to get Fre... |
I am very confused about how to get the transmit sequence of the DPSK signal.
In my lecture notes, teacher give as the following example.
Assume the following rule is apply
"no change" of sign for information 1
"change" of sign for information 0
if the data sequence is "0000 1010 1110 0011"
then the transmitted seque... |
One Question of my note is like this.
Consider a communication channel with a bandwidth of 2400Hz. If QPSK technique is
used, what is the possible transmission rate? (Assume that rectangular
pulses are used in the baseband signals, and that 90% energy preservation is
required.)
For a baseband system, a bipolar signal ... |
Possible Duplicate:
Convolution and DTFT
$x_1(n)=x_2(n)=1$
where $0 ≤ n ≤ N-1$
1)The linear convolution of the signal gives a triangle how you write it in mathematical form?
The DTFT of the signal is given as
$X_1(e^{jw})=X_2(e^{jw})=\pi \sum_{k=-\infty}^\infty \delta(w-2\pi k)+$$ \frac1 {1-e^{jw}}$
How to calculate... |
Suppose PSD of a signal $x(n)$ is $ PSD_{xx}(\omega)=1$. Now if a window function $w(n)$ of length $ 0\le n \le N-1$ is applied to $x(n)$, what will the new PSD be?
|
I am building a whiteboard to track the position of its pen. I have n ultrasound receivers placed on the periphery of the whiteboard, and an ultrasound emitter in the pen. The pen emits pulses the receivers detect. A microprocessor gathers the arrival times of the pulses for each receiver, and with the time differences... |
This is a question I found on internet under DSP section so that's why I am posting it here. Help me understand it please.
A computer adds 1000 random numbers that have each been rounded off to the nearest 10$^{\rm th}$. Find the probability that the total round-off error for the sum is $\ge 1$.
How probability of a... |
I am creating an application that works like the Shazam service. In short, my goal is to create an audio pattern matching service. However, I would like to use DWT and not the short time Fourier transform.
I am faced with some problems interpreting the results of the DWT. In particular I have the following questions:
... |
It's very easy to filter a signal by performing an FFT on it, zeroing out some of the bins, and then performing an IFFT. For instance:
t = linspace(0, 1, 256, endpoint=False)
x = sin(2 * pi * 3 * t) + cos(2 * pi * 100 * t)
X = fft(x)
X[64:192] = 0
y = ifft(X)
The high frequency component is completely removed by this... |
If I pass a signal with DC component through a Low Pass Filter will the output be without the DC component?
|
I am implementing reconstruction of image from gradient domain. This requires solving the following partial differential equation (a Poisson equation) on a 2D grid:
$$\nabla^{2}I=\mathbb{div} G$$
$\mathbb{div} G$ is divergence of a gradient field, which is simply an image with Laplacian operator applied (second-order d... |
I need to simulate the sampling of a continuous (fsCtu = 128000Hz), acoustic signal with two microphones that have a slight offset in sampling rate (fsMic1 = 16000, fsMic2 = 16000.1) in Matlab. What is the best way to do this?
Things I tried:
The Matlab "resample" command only works for resampling to 16000, not to 160... |
Endolith's recent question on zeroing FFT bins got me thinking about a possible error in my workflow and I'd like to double check.
Consider a signal $x_i[m],\ m\in\{1,\ldots,M\}$, i.e. $M$ samples sampled at $f_s$ and the subscript denotes the $i^{th}$ such signal segment. I then filter this with a bandpass filter to b... |
Project Description:
Input:
Frontal Face Image
Expression
Angle
Size
Details:
I have to convert the input frontal face image into 3D face and simulate the given expression (smile, cry, neutral, ..); rotate by the given angle and re-size to the given size. Again convert back into 2D face after the changes.
After googli... |
I created a discrete signal sampled at 44.1kHz that is 330Hz for 1 second, 360Hz for 0.5s, and 390Hz for 0.25s. I did an FFT transformation of this, and got the magnitude graph below:
I don't understand how this magnitude information (combined with the phase information not shown) can reconstitute the original signal... |
What exactly is the difference or relationship between power spectral density and power density function? I thought they referred to the same thing but one article I need says to calculate both of them so now I don't know if they are different. A layman's explanation or explanation in terms of physical meaning would be... |
I need to estimate (extract/produce) the colored noise of a given PSD Data. I have the following procedure to get the desired results.
First of all I calculate the filter coefficiencts using firls command in MATLAB by implementing Helbert Transform firls(filter_order,norm_freq,signal,'hilbert'), the problem I face is ... |
I started working on a autonomous robot project in my spare time. Everything is finished except the image proccessing part. I want my robot to follow an object with particular properties. For the start, I decided to use color as the particular property. For example if object's color is yellow, then I want my robot to c... |
I would like to compute the Inverse Fourier Transform of a given function using the DTFT definition
$$H(e^{jω})=\frac{1}{(2−e^{jω})(2−e^{−jω})}$$
But I have to use the definition of the DTFT
$$H(e^{j\omega}) = \sum_{n = -\infty}^{n = \infty}{h(n) e^{j\omega n}}$$
My approach was that I assume that $x=e^{jω}$, which the... |
I'm trying to match SURF points between 2 images using SURF with opencv. One is the rotation of the other.
The problem is that the few matching it can found are wrong.
image of matching points
I mainly took my code from opencv http://docs.opencv.org/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.... |
I want to stitch 2 images by crosscorrelation measure, but I don't want to use fft.
I tryed this but something seems to be wrong.any suggestions?
void test(IplImage* src,IplImage* temp)
{
double max_peak=0;
Point pt;
double per_x=0.5;
double per_y=0.5;
for... |
I'm new to the field of DSP.
I'm trying to determine the period and shift of the function. I've tried using FFT, but haven't had much luck. Seems like it should be simple.
Signal (pastebin of Octave matrix):
# Created by Octave 3.2.4, Wed Dec 12 00:26:41 2012 PST <jjohnson@jjohnson>
# name: a
# type: matrix
# rows: 1... |
At a glance, the constant-Q fourier transform and the complex Gabor-Morlet wavelet transform seem the same. Both are time-frequency representations, based on constant-Q filters, windowed sinusoids, etc. But maybe there's a difference that I'm missing?
Constant-Q Transform Toolbox for Music Processing says:
CQT refe... |
I would like to use MFCC analysis to distinguish between a male voice and a female voice.
Are there any particular quantifiable characteristics consistent with, and exclusive to, either gender? (E.g., energy, fundamental frequency, excitation, the presence of certain waveforms, etc.)
|
All thresholding algorithms I have read about make no mention about color space, except sometimes using pixel values between 0 and 255 as an example.
But since the intensity output by a monitor of a greyscale is $greyscale^{gamma}$, the perceived difference between 1 and 2 is less than the difference between 254 and 25... |
By definition of Fourier transform
$$X(\omega)=\int_{-\infty}^\infty x(t) e^{-j\omega t} dt $$
Now what will happen to the answer of transform for example in case of $x(t)= \cos(\omega_0 t)$ if limit is $0$ to $A$ instead of $-\infty$ to $\infty$?
For $x(t)=\cos(\omega_0 t)$ its fourier transform is given by $ X(\om... |
Is there any better measurement of error between two images than just taking pixel value differences?
The problem I am tackling is stitching images containing "sensitive" objects, such as moving people. Here are two images I would like to blend:
I compute error map using inter-pixel differences:
The image is then co... |
Prewitt filters are popular filters in image processing for edge detection
http://en.wikipedia.org/wiki/Prewitt_operator
Can anyone give a proof on why Perwitt and other edge detecting filters are high pass?
|
Allow me to show you a snip from Szeliski's Computer Vision book on bilateral filter. I don't know how to interpret these kernel definitions:
In the actual summation what values do the $k$ and $l$ take? E.g For a kernel of size 5x5 does $k$ take values between negative and positive inf? or between 1 to 5 (e.g. in matl... |
My lecture slides mention that two-level ("2-tasoiset" in Finnish) signals are good in identification with linear systems. I am trying to understand this in noisy system. I cannot find any method really to identify the impulse response, perhaps good pre-processing and some other checks?
This is a sub-problem 2F here f... |
i need some guidance with understanding frequency response characteristics.
i have the a signal A with is played on speakers and recorded via microphone which is signal B.
then i apply a window function, shift both signals to frequency domain and analyze the magnitudes,
but the peak for the most dominant frequency is n... |
I am working in face detection and recognition project. I am using STASM for face detction and locating face landmarks. On googling I found AAM (Active Appearance Model) and found that it is also used for face detection and locating face landmarks. Is AAM more efficient than STASM, can you provide your ideas like pros ... |
For a project I need to do convolution and i use gpu for calculations. Sometimes I have to deal with kernel sizes of 50x50 and this size of kernel is sufficiently large that it chokes the gpu. (not enough memory svailable by the gpu) I need to find a way to break the kernel into smaller sizes (8x8 or similar) and do th... |
Let's say we have an ARMA (Auto Regressive Moving Average Model) process where the transfer function is a minimum phase system (Namely Invertible).
By Wold's Decomposition it is guaranteed to have MA representation of that system (Infinite order).
My question is could it be also represented by AR (Auto Regressive) syst... |
With weight vector I mean the vector with weights that you have to multiply the observations in the window that slides over your data with so if you add those products together it returns the value of the EMA on the right side of the window.
For a linear weighted moving average the formula for finding the weight vector... |
What is the difference between circular and linear convolution? When would I choose one over the other? In image processing where a filter is applied to an image with a mask which type of convolution should I choose?
|
I'm writing on a qualitative evaluation study of interest-point-detectors and descriptors. I've read all Mikolajczyk papers as well as most of the surves from Datta et al. etc. Now I'm implementing an evaluation-tool in OpenCV. I'll take to images. One referred as source- and one as comparison-image.
1.) Detectors: Mik... |
I know how the process works, first from difference equation make a homogeneous equation and then find natural response , then find a particular response (in the form of input) substitute it back in the equation and find constants. And we get a forced response. I have a doubt in finding constants.
This example is Dri... |
tl;dr: What is a fast way to get the equation of this line?
I have to extract the "line of best fit" from this data (shown below), and many others like it (so I need a robust method). It is a a spectrogram of a linear chirp. The x axis is frequency and the y-axis is time. The linear chirp came from a truck outputting 4... |
I would like some feedback on possible techniques that one may use to determine the envelope of a broad-band time domain signal. I have heard anecdotally, that it is not as straight-forward as it seems, but I am not sure. (Some previous discussions about similar subjects exist here and here but I would like an explicit... |
I need to downscale an image in a factor of $s_x$ horizontally and $s_y$ vertically ($s_x$, $s_y$ < $1$).
I want to use a finite $n\times m$ low-pass filter before downsampling.
How should I determine the low-pass filter parameters ($n, m$ and the Gaussian $\sigma$) to get it as a function of $s_x$ and $s_y$?
Specifica... |
I understand that the time domain representation of white noise looks like impulses. How do colored noises like brown, pink etc. look like when we perform an inverse Fourier Transform on them ? What could be some sources of colored noise that may affect speech signals?
|
I am studying methods for recovering images (that has been blurred and noised).
Can someone explain the difference between:
http://en.wikipedia.org/wiki/Wiener_deconvolution
http://en.wikipedia.org/wiki/Wiener_filter
I can understand that wiener deconvolution is used for Deblurring while wiener filter is used for Den... |
I am relatively new to image processing and am working on a project that requires the thinning of binary images. In the literature, I've seen references to the Safe Point Thinning Algorithm(SPTA) quite a lot, but have failed to find any definitive source to the algorithm, maybe because most of the articles quoted to de... |
I would like to know if there's a standard way to obtain the FIR coefficients for a sampling frequency $F'$ when the coefficients are for a sampling frequency $F$.
I would like to implement the filter described in ITU R BS.1770-3
(the oversampling FIR filter, page 18).
The filter coefficients are given for a sampling f... |
Possible Duplicate:
What does frequency domain denote in case of images?
I am studying applications of low and high pass filters in images. However, first I'm trying to understand what exactly low and high frequencies are in images.
|
I have two distance maps that describe distances from blue segment and the red segment. I need to compute a single weight map that describes transition from blue segment to the red segment. The weight map should have values in the 0-1 range where 0 is one segment and 1 is the other one.
There are the distance maps with... |
I have an unknown black-box that is generating a deterministic continuous periodic signal and the period is variable between 1 to 30 seconds.
When the black box is turned on, the period is fixed, but unknown.
Sampling rate and signal period are not synched, and it is highly unlikely to be integer coefficient of one a... |
How to recognize a zebra crossing from top view using OpenCV?
It is not a straight zebra crossing - it has some twists and turns.
I have some ideas:
parallel line detection, but the available techniques only work to find straight parallel lines, not curved
template matching to match a template of back to back white an... |
Correct me if I'm wrong, I should read bitmap into matrix of float values where I would get numbers up to little more than 16*10^6, then I should expand my image matrix to size 2^k putting the original image matrix into top left corner of the new expanded matrix.
I should then expand given filter to that size (you coul... |
Project: 3D face reconstruction
Input: 2D frontal face Image Output: 3D face Reconstruction and expression simulation Platform: Matlab or Opencv cpp.
I found out after study that 3D Morphable Models (3DMM) algorithm is a good starting point for my project. But I don't have the Basel Face Model (3D face Database) to imp... |
Apologies if this is too basic.
I need to implement a band-pass filter, for a realtime system.
Not sure what to use. FIR? IIR? Something else ?
Any tips would be highly appreciated.
|
I'm trying to determine what "filter" has been applied to an image. I have the original, raw image and the processed image. The processed image has been put through a pipeline (black box) that does various things to the image in an iterative manner.
The filter, as far as I can tell, is similar to an unsharp-mask, but... |
I'm trying to determine the effect of a particular non-linear process on my data. From simulations, I can measure the power spectra of "ideal" and "processed" images and take their ratio, which (I think) should correspond to some sort of filter or filtering process.
So, are there any filters, or filtering processes,... |
I came across this paragraph in an article about signal processing.
Addition of redundant bits for improving the error probability leads to bandwidth expansion of the
transmitted signal by an amount equal to the reciprocal of the code rate.
(page 16)
http://www.ece.rice.edu/~ashu/publications/encylopedia.pdf
I am not ... |
My goal is to build a real-time filter for EEG data. The data are being recorded in 512Hz and I wish to filter it (in a real-time, from 0.5Hz to 30Hz in the most optimal way).
Unfortunately I'm not expert in DSP stuff, so I'm not sure which type of filter I should use, an IIR or FIR? What is the recommended filter typ... |
I have an image with arbitrary area (the boundary is shown in gray):
I would like to blur just the image within boundaries.
Ordinary blur causes the background proliferating to image and vice versa. This results in dark areas near boundaries of the image:
|
Why does oversampling make the job of an anti-alias filter easier? I don't understand the intuition on why it becomes helpful.
Isn't it economical to just keep the sampling rate at the minimal level, that is twice the highest frequency of the signal, in that way, we can save energy, and processing and computational po... |
I hope this is not off-topic for this site.
In my problem, Viterbi decoder is used for decoding convolutional-coded (rate = 1/2, constraint length = 7) messages.
A message is 250 bits where the first 8 bits are 1/3 of a preamble. There are several types of messages. A message is received as 500 bits because of the codi... |
I need to produce a signal which contains only several frequencies, for example, 17KHz, 17.2 kHz,17.6 kHz. The components I'm using are microcontroller (PIC16F1783 by microchip) which works at 80 kHz frequency, and produces an analog signal, which is then fed into an audio amplifier and then into a speaker.
First, I'm... |
How can I use interpolation with an FIR filter? I am more familiar with interpolation such as nearest distance interpolation, linear interpolation and so on.
Suppose a signal is given as the following series:
time= 1 2 3 4 5 6 7 8
signal=[ 1 1 2 2 3 2 7 6]
Then, if I ask what's the signal value at time 2, ... |
I am working on finding the distance between a camera and an object using image processing.
In many places, it's written that we have to use a stereo pair, but my project allows only one camera. Is it feasible to find distance to an object using just one camera? If so, what are the possible ways to do this?
|
Possible Duplicate:
How to extract traffic signs from a photograph?
I am working on a project which involves detecting north american speed signs (black/white) using a 720p HD camera. My problem is that I cannot seem to figure out how to classify the rectangular profile of the speed signs in order to pass it on to t... |
I want to use Prony's method to fit a signal given by the sum of $p$ complex exponentials
$x[n]=\displaystyle{\sum_{k=1}^p} A_k{\rm e}^{\,{\rm j}\theta_k} {\rm e}^{2\pi\, {\rm j} f_k (n-1)}$.
The problem is that Prony's standard formulation (Hildebrand, Introduction to Numerical Analysis, pp. 378-382) assumes that all ... |
What are the known possibilities to date for filtering the phases of an image and what are they used for?
Phases are used in some edge detection algorithms.
They are also used for cross correlation of 2 images.
Is there something more? (I'm thinking about the same principle used with the amplitudes, bandpass filtering)... |
I'm working on a piano tuning program and part of it requires real-time pitch detection. Here is the scheme I have so far which works to some degree but could probably use some refinement.
I'm capturing mono, 44.1kHz, 16-bit PCM audio in chunks of 2^14 samples. I combine the last 4 samples into a 2^16 length buffer, ... |
I am a power systems engineer and am doing preliminary leg-work for detection of a specific anomaly in power systems that cause the observed waveform to be distorted. False positives are somewhat acceptable here, as missing the said event can be catastrophic. This is what the signal looks like:
Now this waveform is a... |
I have started looking into DSP and made an implementation of short-time fourier transform, using kissFFT to perform the FFT. I then render a spectrogram.
An example image that I have generated can be seen below. On top is the spectrogram of a music file from my implementation and under it is the spectrogram of the sam... |
I want to know how to solve those types of problems.. is it by inspection ?
Consider the linear system below. When the inputs to the system $x_1[n]$, $x_2[n]$ and $x_3[n]$, the responses of the systems are $y_1[n]$, $y_2[n]$ and $y_3[n]$ as shown.
Determine whether the system is time invariant or not. Just your answ... |
I have two audio signals that I want to mix at various mixing ratios. Initially, I simply went for something like
$y(t) = \alpha \cdot x_1(t) + (1-\alpha) \cdot x_2(t)$
where $\alpha$ is the ratio between zero and one and $x_1$ and $x_2$ are the two signals.
However, I have seen a few panning curves that did not mix si... |
I am currently studying DSP and FFT, I am very new to this and have been doing electronics for a long time with Arduino and hobby projects. Recently, I am doing a project with the goal to map potholes along your daily commute in the car, measuring road roughness. This is not the road profile, but the subjected roughnes... |
Reading about independent component analysis (ICA), I learned that one of its applications is face recognition. I think in this problem we have a database of images and a test image to be recognized. However, I can't figure out what the independent components are and what the mixture (multivariate signal) is.
|
How do I implement an Infinite Impulse Response (IIR) filter using Finite State Machine(FSM)? The problem is FSM has finite memory, but an IIR filter has infinite outputs. The closest match is this paper . Unfortunately I do not have access to the paper.
|
Possible Duplicate:
Looking for algorithm to extract line network from binary images within LabView
I would like to create a LabView VI that receives an input image and the RGB-color codes of the powerlines depicted in the image. The output should (eventually) consist of id'd polygonial connections and their coordin... |
I'm studying OpenCV and, in computer vision and image processing, people speak of blobs, contours, connected regions, and I sometimes hear the phrase "image moments".
I know of an article on Wikipedia about it, but I think it is too technical. I don't really want to go deep into the math background but I want to know ... |
Are the following sequence of operations the same -
Down-sampling filtering followed by gradient filtering with kernel [-1 0 1]
Gradient filtering with kernel [-1 0 1] followed by down-sampling
Could you point me to some math which can answer this question.
Intuitively, I am thinking that these operations are the sam... |
I would like to create a LabView VI that receives an input image and the RGB-color codes of the powerlines depicted in the image. The output should (eventually) consist of id'd polygonial connections and their coordinates.
Right now i've finished creating a VI that converts the source image to a binary image with the r... |
I need to know the "number of clusters" in a dataaset.
To find the number of clusters, I am using a Gaussian Mixture model fitting,
bear with me,
Because the underlying distributions (each cluster) are not Gaussian, the GM tends to give very bad fits, because it is trying to compensate for the skewness of the data by i... |
I'm sampling a signal at 44100kHz, and I have 1024 samples on which I perform an FFT.
My bin resolution is therefore around 43 hz/bin, so the frequencies I get energy for are multiples of 43hz: 43Hz,86Hz,129Hz etc...
The problem is that I the frequency I need to calculate the energy for lies between those bins! Specifi... |
Both 4QAM and QPSK apparently produce the same waveform, but are they the same mathematically?
In a QPSK constellation, are the mapping points at 45, 135, 225 and 315 degrees while the 4QAM is at 0, 90, 180 and 270?
I also struggle to understand the I/Q components of such a constellation diagram. What does "inphase" an... |
I explain my question with a simplified example.
I can design an industrial vision system for the automatic inspection of an item with these main requirements:
the image of a good piece must be a black background and the piece must be grey.
the defect must appear as a white area inside the grey area.
These requiremen... |
I'm thresholding an image where the threshold value is a count of the pixels such that for instance if the threshold value is 100, any color value which has less than a 100 pixels is classified black and any color value which has greater than 100 pixels is classified as white. Right now, I'm using a manual method of sp... |
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