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I have an image which is composed of multiple 'angles' which form a grid shape:
After some searching, Hough seemed like a good fit, because it isn't troubled by breaks in lines. However, the problem I have is that my lines are 'fat', and any edge detection I run (Canny in this case), picks out the edges of the line, a... |
I am trying to extract features from an image, but I have failed to get the points that I want to extract, and hence my image fails to match with the template.
Are there any checkpoints that I have to go through before applying SIFT to my image so that I get good results? For example the template image is;
targeted im... |
Disclaimer: I posted this question on StackOverFlow but learned that it is better suited here.
I am a bit new to image processing so I'd like to ask you about finding the optimal solution for my problem, not help for code.
I couldn't think of a good idea yet so wanted to ask your advice.
I'm working on a project using ... |
In term of proper or accepted naming conventions of DSP graphics or instrumentation output, what is the difference between the words spectrum, spectrogram, spectrograph, and similar terms, and what type of chart, graph, CRT display, or etc. does each best describe.
ADDED: Also I found the term sonogram used in a couple... |
I was wondering if any one with experience with both sensors can give some insight on this.
I've heard there can be problems with alignment of the different signals using a 3CCD.
However, when using the Bayer filter, you need to convert, and you have problems of lower resolution, introducing colors that are not there i... |
My team is working on a program that can read nutrition facts labels using OCR, much like NutriScanner (though by its reviews it doesn't seem like it works particularly well).
I've seen other questions noting that it'd be a good idea to straighten out the image prior to running OCR on it. Is there a good image library ... |
What is the theory behind LPC?
Why are(were) certain implementations of LPC said to be more tolerant of transmission or encoding errors quantization than other compressed voice encoding schemes?
Can LPC methods also be used for smoothing or short term "prediction" similar to the use of Kalman filter methods?
Und... |
An accelerometer is used on a high vibration environment (a bicycle) to measure gravity. The signal clips, so data higher than a clipping value is clamped to that value.
So, simply filtering the signal gives the wrong median mean value when the vibration is high.
I want the mean value over a time much longer than the... |
I'm a sleep researcher and since last december I've been collecting data on mydreaming and awakening in the middle of the night.
Dreaming occurs within a well-known 80-120 minute "cycles", with about 5-6 cycles within a typical night. Each cycle is defined by 4 stages, from light sleep to deep sleep to dreaming. I'm l... |
Given an arbitrary frequency response, what signal processing methods might exist that could guess, estimate or determine a transfer function (pole and zero constellation) which gives a "reasonably good" approximation (for some given estimation quality criteria) to that given frequency response? What means exist to es... |
I want to observe how the signal's phase changes over time and I know Hilbert transform can be used here to get the analytic signal, from which I can extract the amplitude and phase.
I know that to get the analytic signal $x_a(t)$ from a continuous-time signal $x(t)$ I need to calculate this:
$$ x_a(t) = x(t) * \mathc... |
Suppose we are tracking a computer mouse on the screen, if we increase the frequency of the sampling rate(to very high values) then would that increase the error in getting the exact position of the mouse or decrease it?
Would we get lots of outliers and we would have to average out?
What I am trying to ask will it g... |
For some denoising and deconvolution experiments, I'd like to apply a 2nd generation wavelet transform (using lifting steps) to images.
I know that there are several implementations available, but most of them use Matlab, while I want to work in C++ with OpenCV.
Since there is no built-in wavelet transform implementati... |
I'm taking a multimedia systems class in my MSc Computer Science, and I'm having some trouble understanding the formula for the alias frequency - this could stem from my misunderstanding of the alias signal.
My understanding of an alias signal is that if you undersample your input signal (i.e. sample at a rate which is... |
i am making a smart home automation software and i would like to know if there is any software that can recognize noises such as speech ,playing music,phone ringing etc
The exact software i am looking for has already been made by mitsubishi but i cant find the source.
A video by mitsubishi explaining what i need
http:/... |
I like to listen to instrumental music while trying to sleep. So, I've selected 20 songs from my music archive to listen to when I go to bed. The problem is that the loudness levels of the songs differ. Therefore, I have difficulty listening to some songs while the others disturb me for a specific volume level. I want ... |
There are a few excellent discussion threads and answers on this site (eletronics.se) on the theory of Fourier transforms. I tried implementing the same in a simulation tool (MS Excel :)).
I have a few interpretation and implementation issues regarding the same. I am trying to analyse an voltage waveform of 50 Hz. Howe... |
I don't know if this question will make sense as I'm very new to dsp.
In my limited foray into audio dsp I've come across:
Frequency Modulation
Amplitude Modulation
Additive Synthesis
Subtractive Synthesis
My question is: are these the main fundamental categories of signal manipulation (specifically for audio)?
In o... |
I have a database of Chinese character stroke animations. Each entry is basically a set of points which shows how and in which order a character should be drawn.
To make lookup easier, I would like to allow the user to manually draw a character with the mouse, then my software would propose some possible matches (like ... |
I do not quite understand the difference between the CDM and FFCDM.
How can I implement CDM in a program?
|
Context:
(Disclaimer: This is NOT a comm problem).
I am trying to estimate the fundamental frequency of a real, periodic signal. This signal, was constructed by match filtering a raw signal, to that of a pulse. (the matched filter). The resultant signal has the following characteristics:
It is periodic. (Fundamental i... |
Hi I'm taking a multimedia systems course and I'm preparing for my exam on tuesday. I'm trying to get my head around LPC compression on a general level, but I'm having trouble with what is going on with the linear predictive filter part. This is my understanding so far:
LPC works by digitising the analog signal and s... |
Hi I'm doing a past exam question about converting from stereo to mono. The scenario is below:
The first question is: Explain why would this result in a noisy encoding. How is the noise introduced and what does it sound like?
Second Question: What would you do to prevent such noise being introduced?
Answer 1:
The ... |
I'm doing practice exam questions for my multimedia systems exam one tuesday and a topic which seems to come up frequently is the appropriate use of encoding B-frames based on:
1) the previous I or P frame
2) the next I or P frame
3) an average of the previous I or P frame
I'm having a bit of trouble thinking up dec... |
Hi I'm preparing for my exam tomorrow and I've come across a 17 Mark question which seems trivially easy, so I think I'm missing a key point giving the rest of this exam is fairly difficult. The question is below and my attempt is below that.
Question
The frame sizes are below:
My attempt:
I looked up video capture ... |
In all video coding standards, motion estimation is always done in pixel domain using block matching. I wonder why it cannot be estimated in DCT(Discrete cosine transform) domain using block matching directly? If two blocks are similar in value in DCT domain, doesn't it mean that they are similar to each other in pixel... |
I know that why we use Carrier of high frequency to send message signal over a long distance, when the frequency is low , energy will be obviously low. To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency)... |
Background information
According to Cover's text book on information theory Mutual Information is calculated as:
$$(1) I(W;C) = \Sigma_k\Sigma_i P(C_k,W_i)log(\frac{P(C_k,W_i)}{P(C_k)P(W_i)})
$$
Now if we were interested in a single Word W_i we would just calculate this with one sum:
$$(2) I(W_i;C) = \Sigma_k P(C_... |
I realize the two are derived using different algorithms, and the units are different, but from a conceptual standpoint of the information they provide how do they differ?
I'm thinking here about the more or less specific (yet general) case of a "representative" block of samples from a time series, where the gross stat... |
I have taken a series of images of a fringe pattern at regular time intervals. This fringes are generated by shining a laser beam onto the CCD camera. The laser goes through a lot of optics, which is why it creates these fringes.
There is some vibration in the laser system setup which causes these fringes to move aro... |
My question is about edge descriptors produced from an edge detection method applied on an object image. As we know, an edge has four descriptors edge normal, edge direction, edge position, and edge strength. These descriptors are used for differentiating between the detected edges.
Are all of this descriptors are nec... |
I am right now dealing with some image processing in Python via PIL (Python Image Library). My main aim is counting the number of colored cells in an immunohistochemistry image. I know that there are relevant programs, libraries, functions and tutorials about it, and I checked almost all of them. My major aim is writin... |
Given a periodic impulse train and it's impulse response, how is an auto-regressive model of this system computed or estimated?
|
Designing a simple 2nd order IIR bandpass Buterworth filter with a centre frequency of 500 Hz and a 1 octave bandwidth gives me the following frequency response ...
Now, if I take the impulse response and normalise it and convert it to dB, we can observe the decay of the impulse response.
The decay of the impulse res... |
I have a binary image obtained from a canny edge detector. The edges are not nicely detected in the center and I need to join them. The connection of edges is orientation and neighborhood dependent. I need to connect the vertices if they are below a threshold (say less than 5 pixel distance). If my almost linear featur... |
Is it possible to use voice recognition algorithms to reduce/remove the noise in financial time-series?
Does such an approach even make sense?
If "yes", how could that be done technically?
|
I understand that a Laplacian-of-Gaussian filter can be approximated by a Difference-of-Gaussians filter, and that the ratio of the two sigmas for the latter should be 1:1.6 for the best approximation. However, I'm not sure how the two sigmas in the Difference of Gaussians relates to the sigma for the Laplacian of Gaus... |
I have $n$ surfaces: $z_i(x,y)$ with a measured attribute (variable) on each surface: $a_i(x,y)$. Most of the surfaces will have a random distribution of the attribute across the surface, but some surfaces (the interesting ones) will show a meandering river pattern:
I need your help in coming up with a measure that w... |
In a current audio processing application, I am working entirely in the time domain using IIR filters. This is so I can use an audio buffer of just 3 or 4 samples and can guarantee that there will be some form of audio output within that frame.
If I were to switch to FIR based filters (to reduce filter ringing time as... |
I'm gathering temperature data from a refrigerator. The data looks like a wave. I would like to determine the period and frequency of the wave (so that I can measure if modifications to the refrigerator have any effect).
I'm using R, and I think I need to use an FFT on the data, but I'm not sure where to go from ther... |
I am interested in implementations of the Haar transform, and its inverse, such that when composed always result in the identity operation. My inputs are discrete ordinals within a given range - and I need the output of the Haar transform to be similarly discrete ordinal (or fixed-point) numbers.
I've worked on the ba... |
I'm reading a paper in which a discrete signal
$$x(n) = s(n) + w(n)$$
is considered. $s(n)$ is a known, deterministic series, and $w(n)$ is white noise with zero mean. The authors write that
signals were generated with an SNR of 20 dB
What does this mean?
What does signal energy mean? There seems to be several way... |
With application code, I have implemented a linear ADSR envelope for shaping the amplitude of an oscillator's output. The parameters for attack, decay and release duration as well as sustain level can be set on the envelope and everything works as expected.
However, I would like to tweak the ramp shapes of the envelop... |
I am trying to compare audio waveform from input waveform (A) to preset waveform (B)from in the device.
I try to lookup everywhere. Most likely someone give such a source code as follow :
function compireAudio(){
var audio1 = "http://soundjax.com/reddo/86502%5Ealarm.mp3";
var audio2 = "http://soun... |
I was reading the chapter on discrete Fourier transforms in Lyons' book -- Understanding Digital Signal Processing -- and could not understand the last paragraph about symmetry.
There’s an additional symmetry property of the DFT that deserves mention at this point. In practice, we’re occasionally required to determine... |
I have to detect my elbow. I'm able to produce an image in which I'm facing the camera, standing before it and my arms are in my body plane(body plane is plane containing my head,chest,and legs)(i.e. to say that my arms don't stick out of this plane though they may be placed on my chest parallel to the body plane). The... |
I have to connect nearby contours in an image based on the distance between them which specifies if the contours are to be connected.
Now there's a question already on the same problem here https://stackoverflow.com/questions/8973017/opencv-c-obj-c-connect-nearby-contours but here he merges all contours into a single o... |
I have to capture skin colour independent of illumination.
I used the following criteria(using hsv and rgb) but it ain't working:
int h = get_hue(...);
int s = get_saturation(...);
int r = get_red_component(...);
int g = get_green_component(...);
int b = get_blue_component(...);
if ((h<38)&&(h>6)&&(s>0.23)&&(s<0.68)){... |
I think I must have misunderstood something regarding the relation between impulse and frequency responses.
I have calculated the Impulse Response Function, IRF, from the Frequency Response Function, FRF, by FFT and then I find some strange things, among these that my assumption that the IRF will always be real is not... |
I am developing an augmented reality SDK that uses Kalman for tracking a planar marker. My state is composed of 3D position, a quaternion, velocity and angular velocity.
\begin{bmatrix}{\vec{p}}\\{\vec{q}}\\{\vec{v}}\\{\vec{\omega }}\end{bmatrix}
For some reason Kalman is not tracking properly. I think that the proble... |
I'm receiving PCM data trough socket connection in packets containing 320 samples. Sample rate of sound is 8000 samples per second. I am doing with it something like this:
int size = 160 * 2;//160;
int isinverse = 1;
kiss_fft_scalar zero;
memset(&zero,0,sizeof(zero));
kiss_fft_cpx fft_in[size];
kiss_fft_cpx fft_out[siz... |
I´m currently working on an accordion synthesizer and I would like to make it sound as natural as possible.
I really like how the following wave sounds:
https://dl.dropbox.com/u/20437903/onda%20acordeon.wav
The wave looks like this:
Looking at the wave it looks like it had harmonics added and substracted. Am I wrong?
... |
I'm trying to add documentation for all the window functions in scipy.signal, and I'm stuck on the Slepian (same as DPSS?) and Generalized Gaussian windows, which I'd never heard of before.
There are two variables that are shape parameters of some type, p in the generalized Gaussian, and width in the Slepian. (sig app... |
For a linear state-space model with independent Gaussian state and output noises and perfect guess for initial state, do Kalman estimates have the following properties:
$$
E(\hat{x}_{k|k} - x_k) = 0
$$
$$
P_{k|k} = Var(\hat{x}_{k|k} - x_k),\text{ or }Var(\hat{x}_{k|k}),\text{ or }Var(x_k) ?
$$
where
$x_k$ is the stat... |
I've been using a program for identifying harmonics for a wave after doing a fourier analysis.
http://www.phon.ucl.ac.uk/resource/sfs/esynth.htm
I would like to be able to tweak some of the harmonics involed in a wave and also to add harmonics.
The program mentioned above permits this kind of operations but it isn't pr... |
I have an image of 480x360 px that contains eye portion only i.e., sclera iris, pupil, eyebrows etc. Now I have to find the lower eyelid in the image.
What I've done till now is that cut the image in 2 parts upper and lower half. Now apply edge detector (Canny) on lower part and then parabola fitting on the resultant... |
i have to distinguish between palm and elbow in my contour(I'm using cvconvexitydefect for that purpose). Here's the image:
I'm taking contour of left image.
the 2 topmost points in right image are shoulder(detected by other method)
bottom left 2 are darker than bottom right 2 (to distinguish between left and right ha... |
I'm trying to make a channel vocoder that takes two inputs, one a frequency rich carrier (a musical sound) and the other a modulator (vocals). Applying operations involved in the channel vocoder generates an output that makes the vocals sing in the tone of the carrier. (Think Songify.)
Presently I'm splitting both the ... |
I'm preparing for my exams I stumbled across this exercise. Now I can't seem to figure it out. Anybody can help me ?
The exercise:
For the 8bit data word: 00111001 the check bits are: 0111. Now if the word is read from the memory and the check bits are 1101, what is the dataword?
The text is translated from another lan... |
I have microphones measuring sound over time at many different positions in space.
The sounds being recorded all originate from the same position in space but due to the different paths from the source point to each microphone; the signal will be (time) shifted
and distorted. A priori knowledge has been used to compen... |
I'm developing correlation filters based image recognition.
I implemented MACE correlation filter in matlab:
training code:
D = diag(mean(abs(X),2));
% inv(A) * B = A \ B
XDX = ctranspose(X) * (D \ X);
h = (D \ X) * (XDX \ u);
H = reshape(h, size(I));
where X is the d.^2xN matrix of vectorized FFT2 transformed trainin... |
I'm a chemical engineer, not an EE, so this is a bit difficult.
I'm trying to figure out how to take amplitude vs time data and transform it into frequency vs time. My first instinct is to slice my data into chunks, perform the FFT on each chunk, and then plot that. Unfortunately, as the time duration of each slice a... |
Consider the 4 following waveform signals:
signal1 = [4.1880 11.5270 55.8612 110.6730 146.2967 145.4113 104.1815 60.1679 14.3949 -53.7558 -72.6384 -88.0250 -98.4607]
signal2 = [ -39.6966 44.8127 95.0896 145.4097 144.5878 95.5007 61.0545 47.2886 28.1277 -40.9720 -53.6246 -63.4821 -72.3... |
So if you generate a square wave by just switching a signal between two values, at sample boundaries, it produces an infinite series of harmonics, which alias and produce tones below your fundamental, which is very audible. The solution is Band-Limited Synthesis, either using additive synthesis or band-limited steps t... |
I am looking for good tools for Audio signal processing. e.g Speech & music analysis, automatic language identification, etc.
Does the Scipy library provide functions for audio processing? Does it have a good tool for Audio Signal processing?
Can you please suggest a tool for this?
|
I use a Quadrature Demodulator in my SDR application, which is defined as:
$\angle (S_n, S_{n+1})=arctan(S_{n+1}*\overline{S_{n}})$
So practically its amplitude is the angle between two Samples $S_n$ and $S_{n+1}$ where $n$ refers to a position in a sequence of complex values of I and Q. $\overline{S}$ be the complex c... |
I am developping a program, that extracts very expressive frames from a video (meaning: frames, which could summarize a video) for a university seminar. One of my ideas was, to analyze the audio data (e.g.: if it's very loud, there must be sth. happening and so on). I'm using Praat for this analysis. Now, I stumbled up... |
I have to do an exercise. Given this signal: $H(f)=\frac{\frac{T}{2}}{1+(\pi f\frac{T}{2})^2}$ calculate the frequency at $-6 db$. How can I resolve this exercise? I tried this: $\frac{\frac{T}{2}}{1+(\pi f\frac{T}{2})^2}=10^{-0.6}$ but I don't know if it is correct
|
I have hue, saturation and value of a color (HSV color-space). The color has to be set on a device that displays them incorrectly. If I specify white it displays light magenta. However, if you specify some green it displays the best white it can (let's say: gray). How do I remove this color cast? Actually: How do I cre... |
I didn't take any class on image processing but I studied the subject based on lecture notes and important books for last three months. So at this point, I would like to sharp my image processing skills. Of course, I am practicing a lot of image processing work but the work seems to be very similar.
As a programmer, I ... |
I am trying to understand the bode plot result I have obtained.
The blue, green, and red plots are $a$, $ b$, and $a+b$ respectively.
What I'm having a hard time understanding is how a+b is formed. Looking at the magnitude of $a$, it is in the range of $500 dB$ or $$10^{25}$$. Whereas, looking at $b$, it is a nega... |
This question is on dsp.SE as I'm mostly interested in the signal processing part.
There is an Indian movie Mughal-e-Azam which was released in 1960 in black & white which has been reproduced in color in 2004.
How did they color each pixel perfectly?
What technique have they
used to identify the color placement on eac... |
While looking for an answer to this problem, I found this board so decided to cross post this question of mine from Stack Overflow.
I am searching for a method of determining the similarity between an audio segment and a human voice, which is expressed numerically.
I've searched quite a bit, but what I've found so far... |
I have the task related to Radon transform which contains a subtask which uses resampling by means of DFT.
Let's consider the non-periodical discretized signal (Fig.1) (for example the string of pixels) having 515 pixels length. In my implementation for resampling contains following steps:
Cyclic left shift (Fig.2).
... |
What differences or other criteria can be used to help decide between using overlap-add and overlap-save for filtering? Both overlap-add and overlap-save are described as algorithms for doing FFT based fast convolution of data streams with FIR filter kernels. What are the latency, computational efficiency or caching ... |
Assume some unknown but small and finite number of poles and zeros in the complex Z plane, all with complex conjugates, producing some response. Strictly from the absolute value of a set of equally spaced points around the unit circle, say greater than 2X the number of poles and zeros, of that response, is it possible... |
I am currently working with and comparing the performance of several feature detectors provided by OpenCV as basis for visual feature matching.
I am using SIFT descriptors. I have accomplished satisfactory matching (after rejecting bad matches) when detecting MSER and DoG (SIFT) features.
Currently, I am testing my cod... |
I am just wondering how does camera auto focus work. What kind of processing does it do on images in order to adjust the focus? Is there freely available code that detects the focus level of an image or video?
|
I got a tracked robot toy and I'm controlling it with an iPhone. The robot outputs a live camera feed of a known frame size and I'm displaying it on UIImage.
I've added a laser pointer to the robot and fixed it alongside the axis of the robot. I'm trying to detect the laser pointer dot on the image and thus try to cal... |
I am attempting to implement a basic bandpass filter but the center frequency of my filter seems to be irrelevant as I can change it all I want but it has no effect on the filter.
where am I going wrong?
I have given my calculations here in the hope that someone will be able to point out where I'm making a mistake.
Fil... |
I am currently reading the paper A Highly Robust Audio Fingerprinting System and on page 4 one can read about the technical parameters they use: Sampling rate of 5000 Hz, frames of 2048 samples as input to the FFT and with these settings they analyse frequencies from 300 Hz to 2000 Hz. Here are the respective quotes:
... |
I have fairly good understanding of DSP theory and algorithm design (and also MATLAB and C). What are the best books or what other advice could be given for learning how to actually implement DSP algorithms i.e. DSP programming (e.g. fixed-point/floating-point considerations etc.)
I have also considered getting a DSP e... |
I've found on multiple sites that convolution and cross-correlation are similar (including the tag wiki for convolution), but I didn't find anywhere how they differ.
What is the difference between the two? Can you say that autocorrelation is also a kind of a convolution?
|
I have a continuous signal x(t) such that
$x(t)=12cos(6\pi t)+6cos(24\pi t)+3cos(30 \pi t)$
and is asked to sketch a 1-sided Amplitude Spectrum of the signal x(t) if sampled above the minimum sampling rate.
because $w=2\pi$, i worked out that the three signals are 3Hz, 12Hz and 15 Hz.
I'm just wondering, when I plot th... |
I am doing a final year project which involves finding the position and orientation of a screw which has to be opened by a robot hand having a screw driver as an end effector.
I have developed a program in matlab that detects the screw and returns its centroid, I have also gone ahead to calibrate the camera and I have ... |
I am trying to figure out if there is anything more to the phrase 'complex band shifting' than just, a simple band shift. Disclaimer, this is NOT a communications problem, and I only say this so that some answers do get carried away with bit rates, etc.
Basically, let us say that I am interested in a signal, that exist... |
This wiki post on wiki.hydrogenaudio.org says that it is very similar to PEAQ and also a part of ITU-R BS.1387 recommendation ? How reliable it is for determining audio quality.
Are there any other open implementations of PEAQ that are good.
|
I have been working in and learning about both Computer vision and Image processing for a few years now, and I believe that I am not a complete beginner any more.
Still, after all these years, it is hard for me to tell for any particular part of my work whether it is mostly Computer vision related, or if it is Image pr... |
The values that one can find in a wave file, e.g.
0.0036
0.0026
0.0174
0.0050
0.0026
0.0108
0.0154
-0.0114
-0.0006
0.0115
are - as I assume - relative values between -1 and 1, the range you normally see when watching a waveform in some audio editing program. Now, how are these rel... |
I read in a paper http://tcts.fpms.ac.be/publications/regpapers/2011/nrmmbgtd_icvs_LNCS.pdf about spatio-temporal filters, which is applied to frames of the videos. I could not understand these terms in the paper if anyone can help.
3D Low Pass Filtering
Temporal Neighborhood
Spatio Temporal Filters
|
I'm a beginner in radio demodulation, and several days can't solve my problem. The problem is to get bit stream from known frequency.
I made I C# application that gets the data in real time from FunCube dongle and applies FFT. But what to do next - it is a puzzle for me.
The final goal is to detect narrow-band signal ... |
The target is to get a color of selected area from taken photo on a mobile device.
So I've needed to make some image processing programmatically.
Is it exist any algorithm to approximate color to it's natural value?
|
I'm studying about the analysis of (mainly) fMRI and EEG data. Multiple times it's mentioned that to reduce noise, you can use averaging, but nothing more detailed than that.
There never is literally stated that you can use this or that technique to average.
So, what exactly is averaging? What techniques can be used to... |
I would like a pair of complementary IIR filters (lowpass/highpass). By complementary, I mean, when the output from the two filters is summed, the original signal is recovered. I thought I could build such pairs with butterworth filters but using a little math, I discovered only 1st order filters were complementary. I ... |
I have created a database (DB) of amplitde vs time delay of UWB pulses originating from various (known) points in a certain (known) "region" in a space. This DB also stores region name, since there are several regions . This is "training phase".
the folowup part is called "localization phase" -- I assume that there is... |
Anyone have an idea of how I can implement autocorrelation of power spectrum of one image? I tried using:
autocorrel = ifft( | fft(power spectrum) | ^ 2 );
but it's not working. Do you have any idea why or some other way?
|
I see the HSV colour space used all over the place: for tracking, human detection, etc... I'm wondering, why? What is it about this colour space that makes it better than using RGB?
|
I am trying to parallelize the computation of an FFT on terabyte-sized signal files. Right now such an FFT using an open-source library takes many hours, even running through CUDA on the fastest GPU I have. The framework I am trying to adapt to this process is Hadoop. In very basic terms, Hadoop distributes a problem o... |
If I wanted to apply a 100Hz frequency shift to a QAM signal with a 500MHz carrier frequency, I would
Demodulate it at the carrier frequency
Apply a frequency shift to the original signal
Modulate it again at the new carrier frequency
Is there a way to apply a frequency shift to the IQ values of a QAM signal without ... |
I am dabbing a little bit into signal processing on MATLAB. And I have the following question that I would like to know the answer to.
What has to be done : Plot the Spectrogram of an audio file.
What I know : Since its an audio file, I use wavread to read it and use the array returned to plot any of the graphs that I... |
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