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I am trying to search for image/video compression schemes which offer superior compression performance (holding image quality as constant) when compared to widely adopted industry standards (i.e. JPEG/H.264), but for reasons of them being either too computationally or resource intensive, implementing them on CPU-based ... |
It may be a very simple question. We would appreciate any comments, guide or complete solution. We prefer however incomplete solutions but novel practical ideas.
- How to find the main direction of variation i.e., main diagonal in the following example figure (north-east,south-west)?
Any algorithm and idea for coding o... |
I'm trying to implement a simple demodulator as an evening project (to understand how this works - my background is in physics not engineering) and was wondering if anyone has any advice.
To make a working demodulator I think I need to implement an:
Equaliser (I was thinking of using a steepest descent algorithm).
Ch... |
Whenever we need to find component of one signal along another signal we can do so by the help of dot product. I want to as if this method is valid for all kind of signals. Are there any restrictions upon either of the signals?
|
I was explaining to someone how Fourier series work in context of constructing signals that are not everywhere differentiable, e.g. square waves, sawtooth waves, etc. When I mentioned the Gibbs phenomenon however, I realized that I never really learned of why it happens. In fact, as the story goes, not everyone even re... |
I'm trying to perform automatic pitch tracking for piano. It's easy to detect the note when there's only a single note pressed. There are 88 keys on the piano and I set the result to one of them. There may be misclassifications due to octave shift. For example, instead of 40, I find 52. They are both C, but 52 is one o... |
I am looking for open source implementation of thinning algorithm in 3D.
Thinning algorithm: Convert binary shapes to 1-pixel wide lines, without shortening it or breaking it apart. For example, the thresholded version of hand written or printed alphanumerics can be thinned for better represetation and further proces... |
I want to amplify regions with a specified color in an image. For this purpose I have defined a simple function
$B(x,y)=s_r(x,y) \cdot w_r + s_g(x,y) \cdot w_g + s_b(x,y) \cdot w_b$
which produces a gray scale image B(x,y).
The weights I have defined with
$w_r \in [-2,2],w_g \in [-2,2], w_b \in [-2,2]$
The channels of ... |
This was the image obtained after Gabor filtering... Is there some way of removing the lines inside the image except the bright white rounded defect.
Did try another orientation of gabor filter go the following result:
After thresholding :Which is ok enough but not great
After Median filtering:
Thanks in advance
|
Im new to Matlab. I need to split the time dimensions of an audio track into frames of 10mS and for every 10mS frame have to compute the FFT to generate the spectrograph.
I need help on this.
|
I have trouble distinguishing between these two concepts. This is my understanding so far.
A stationary process is a stochastic process whose statistical properties do not change with time. For a strict-sense stationary process, this means that its joint probability distribution is constant; for a wide-sense stationary... |
Getting the DCT coefficient based on what I've read, is usually done through a matrix, usually 8x8 or 16x16 using these formulas:
$$B_{pq}=\alpha_p\alpha_q\sum_{m=0}^{M-1}\sum_{n=0}^{N-1}A_{mn}\cos\left(\frac{\pi(2m+1)p}{2M}\right)\cos\left(\frac{\pi(2n+1)q}{2N}\right),\quad
\begin{align}
&0\leq p\leq M-1\\
&0\le... |
I am trying to figure out a way to find out the vein pattern in the hand.. Please could someone suggest ways to do the same.? I know first i would need to find the ROI in the image and perform further processing .. Can gabor filter be used as one of the steps ?
Thanks
|
Foreword: I'll give some background here because I'm not sure all my premises are correct. I encourage you to IGNORE THE BACKGROUND, unless you're really interested / bored :)
The Question
I want to calculate the eigenvalues of this system.
$\frac{dM_0}{dt}=k+t_0 M_1 - M_0 (t_1+d)$
$\frac{dM_1}{dt}=t_1 M_0 - M_1 (t_0+d... |
How identify the presence or absence of regular stripes of different colors, but ranging from very very very very light pink to black inside of a scanned image (bitmap 200x200dpi 24-bit).
Carry a few examples.
Example 1
Example 2 (the lines are in all the columns except 7 in the second row of the last column)
For now... |
I am trying to identify a sound region of a word from a wav file (44100Hz). My research gave me the idea that I must use "Short-Time Energy" and "zero crossing rate". But the problem is I am not clear with the formulas to code. So if someone can guide me to a much clear Pseudo code I will greatly appreciate it. And als... |
I want to define some distances to use over an image, which I create.
I think I need to define two different "distances".
The first distance should be the most robustness preserving in compare to the original image.
The second one should would be the most transparency preserving in compare to the
original image.
For ... |
Does anyone know if there is a simple explanation on the fact that the theoretical bit-error rate (BER) curves of a Quadrature phase-shift keying (QPSK) system are approximately 1 dB shifted from the simulated curves?
|
If Anti-causal systems are defined as those whose output depends solely upon future inputs.(Is this definition correct as I understand)
So i see that $y[n] = x[n+2]$ ; is anticausal system
How is a time reversing system such as:
$$y(t) = x(-t) $$
anticausal?
e.g. $y(2) = x(-2)$ it infact depends upon past.
Looking fo... |
I need to compensate a OFDM-16_qam constelation rotation but I could not find out how to implement it with MATLAB
I have a Matrix [48 x 25] where each colum is a OFDMsymbol without CP , pad and pilots, this matrix was passed through a Multipath channel using the matlab command Ch=rayleigh and filter(CH,OFDMsymbol) and ... |
I have a series of data (single array). If I take this data and plot it, I can see that there are multiple peaks. However If I zoom in to a section of data, I see that there is substantial noise.
I like to detect how many peaks in the data using little CPU time and energy. I thought of detecting the slopes of these p... |
Will someone be able to explain short time energy function for me in a simple way explaining all the variables in the formula?
The issue that I have is in the formula the summation varies m like,
m=n-(N-1) to n
from my research what I understood is that n is the center sample of the window, so if the center of the wi... |
I am doing some research on Gabor filters for detecting dents in cars. I know Gabor filters have had widespread use for pattern recognition, fingerprint recognition, etc.
I have an image.
Using some code from the MathWorks File Exchange site, I got the following output.
which somehow isn't the output that one would e... |
I am implementing an iris recognition system in matlab and have performed the following steps according to an algorithm proposed in a paper
Initial image
Median filtering
For each row in the filtered image, assign a value of one to the pixels that have the minimum value in that row and the other pixels to zero
Agai... |
What kind of edge detection is used Paint.NET program? It allows me to choose the angle of the edge not like the one used by opencv (Canny).
Here an example:
|
I have an image
Is there any way of removing the bright white spots ? Please help thanks
Edit:
After operating with gaussian and then displaying using imagesc get the following output which clearly shows the bright red spots How do i get rid of them
Red Channel :
Green channel:
Blue channel:
Edit 2:
Defect detect... |
I am happy to accept suggestions either in R or Matlab, but the code I present below is R-only.
The audio file attached below is a short piece of conversation between two people. My goal is to distort their speech so that the emotional content will becomes unrecognisable. The difficulty is that I need some parametric s... |
I have the differential system equation with some unknown parameters (friction coefficients)
Also I have experimental data. What I want is to determine the friction coefficients which best fit the experimental data. How to do it using the Mathematica, I know there NDSolve and FindFit functions, but they can't be used h... |
Can anybody explain how I can implement the Fast Fourier Transform (FFT) of length unequal to a power of two in hardware, e.g. FPGA? What is the algorithm for this implementation?
Does anybody know about the probable chips or hardware that are currently used with the FFT length unequal to a power of two?
|
For a Face Recognition system which one is better using Neural Network or the Histogram with pattern matching concept ?? which one is more accurate??
I need to integrate the face recognition engine to a Java project so I think it is hard to integrate a math lab project to a java project. So I need to know about Histogr... |
What is a robust way to fit piecewise linear but noisy data?
I'm measuring a signal, which consists of several almost linear segments. I'd like to atomatically fit several lines to the data to detect the transitions.
The dataset consists of a few thousand points, with 1-10 segments and I know the number of segments.
T... |
I have a stateful black box with four real-valued inputs and one real-valued output. My problem is to predict the output at each moment in time, given the sequence of inputs seen up to that point. During a learning phase, I can vary the inputs however I want and observe the output. There's a little noise, of course,... |
I'm want to program my own vocoder synthesizer like "Songify" but I can't find a simple of vocoder algorithm. Maybe you can explain or tell where to look for information on how vocoder works.
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Is it possible to convert a .jpg image to binary using Java?
I have asked a similar question on StackOverflow but thought that maybe this may be a good place to ask, too.
I am currently able to convert an image to negative in Java, but am unable as of yet to figure out a way of converting it into binary.
Any suggestion... |
My question is basically in regards to how to detect when (in time) a signal 'starts', and it might also be called 'transient detection', or, as I have read in some papers regarding music, the 'onset' of a signal.
The motivation here is ultimately a Time-Delay-Of-Arrival (TDOA) estimate between two signals, but suppos... |
We always hear about this vector of data VS this other vector of data being independent from each other, or uncorrelated, etc, and while it is easy to come across the math regarding those two concepts, I want to tie them into examples from real-life, and also find ways to measure this relationship.
From this stand poin... |
I designed a digital filter using fdatool of matlab and obtained the filter coefficients from the tool.
The problem is that i designed a 4th order filter. This gave me 5 filter values
h[] = {0.1930,0.2035,0.2071,0.2035,0.1930}
x[k] = Discrete time input signal
Now on using the formula
Output = h[k]*x[n-k];
Output re... |
I have a philosophical question of sorts for users familiar with a multi-view stereo setup. Imagine that I need to measure the dimensions of a large building and I take several photos of the building from different viewpoints. After calibrating the camera (intrinsic and extrinsic), I compute matches between points in t... |
Aside from Jsteg of Derek Upham, Outguess of Neils Provos, and F5 (improvement of F3 and F4) of Pfitzmann and Westfeld, What other methods can you use in information hiding in JPEG images?
The methods I mentioned above hide the message in the DCT coefficients of the image before it is compressed. Are there other compon... |
(This question was already asked on Stack Overflow under the tags Matlab/Octave/Signal-processing/Image-processing, but I am reposting it here following the advice of one user that this site may be a more appropriate forum for such questions.)
Is it common/useful to generate an anti-aliased boolean mask for CCD image i... |
Does anyone know of any image compression techniques with the following characteristics:
lossless
streaming - I want to compress on the fly, pixel-by-pixel.
low-memory overhead - I can afford to buffer a single line, but ideally not even that.
no dynamic dictionaries
"real-world" images only, so performance on "nasty ... |
In our unmanned aerial vehicle grayscale video image stabilization application, we're having difficulty finding the "good" Harris corners in frame N+1 selected from frame N. The source of the difficulty appears to be radical nonuniform pixel contrast changes between frames. Perhaps being airborne and using a slow frame... |
I am building an optical OOK (On off Key Ring) system without a carrier frequency. [However I have a guard time in between symbols, so a consecutive "1" messages will result in a pulse train as opposed to DC, see image]. Essentially, the presence of signal indicates one and lack of it indicates zero. I have a precise ... |
I am aware of image-independent basis, i.e. DCT, and image-dependent basis, i.e. Karhunen–Loève, which are used in compacting energies for image compression. These bases are orthorgonal.
Are there any compression basis which are non-orthogonal that delivers better compaction than the optimal KL transformation? They can... |
I've been trying to work out the logic for this task, and plan to use the KissFFT source package to perform the fast fourier transform. Please let me know if this looks about right:
Allocate an FFT structure, ie. kiss_fft_alloc(N,0,NULL,NULL)
Where N is the window size I'm using. The input buffer will be an array of... |
How can I change the formula to detect the barcode in every angle?
rgb = imread('barcode4.jpg');
% Resize Image
rgb = imresize(rgb,0.33);
figure(),imshow(rgb);
% Convert from RGB to Gray
Igray = double(rgb2gray(rgb));
% Calculate the Gradients
[dIx, dIy] = gradient(Igray);
B = abs(dIx) - abs(dIy);
% Low-Pass Filter... |
Three questions:
What are all the metrics one can use to measure audio interpolation quality, objectively? (but also in terms of psychoacoustics if possible)
By those metrics, what is the current state of the art in audio interpolation?
Suppose I were to render two files from a sequence of notes from virtual instrumen... |
Possible Duplicate:
When convolving two functions that are constants in a region and 0 everywhere else, where does the integration start?
I have a function $f(x,y)$ and $h(x,y)$. $f(x,y)$ has a value of $\frac{1}{3}$ when $x$ is between $\frac{1}{3}$ and $\frac{5}{9}$, and $y$ is between $0$ and $1$. The function ... |
I have the need to detect two different gestures that occur when looking at accelerometer data. Here's a run down (as brief as I can make it):
Lets say an iPhone is being oscillated back and forth while remaining face-up. The user can either do one oscillation (once forward or backward, gesture one) or a continuous os... |
As far as I understand, both SURF and SIFT are patent protected.
Are there any alternative methods that can be used in a commercial application freely?
For more info on the patent check out:
http://opencv-users.1802565.n2.nabble.com/SURF-protected-by-patent-td3458734.html
|
I want to write code in matlab to find a characteristic scale of an image patch.
I have an image patch X, I need to maximize function F(X,sigma) so that sigma is the characteristic sigma.
For my experiments, F can be the laplacian of the image, sigma is the "power" of a gaussian filter on the image. F(x,sigma) should r... |
Using the DTFT property, find h[n] of a system where:
Is it an FIR or IIR system?
|
This is a continuation of a previous question.
I'm trying to analyze breathing and snoring sounds, and while I can fairly well detect snoring now, breathing is a bigger challenge.
I've learned that if I break the analyzed frequency range (about 4KHz, sampled at about 8KHz, with a framesize of 1024) into about 5 subrang... |
I have a question regarding my homework.
Let's assume that the transform of $x[n]$ is $X(\omega)$.
Find $Y(\omega)$ as a function of $X(\omega)$:
$$ y[n] =\cases{x[n/2],&\text{if } n \text{ is even}\cr 0,&\text{if } n \text{ is odd}}$$
Find $Z(\omega)$ as a function of $X(\omega)$:
$$ z[n] =\cases{x[n/2],&\text{... |
What is the gradient domain? Does it relate to the Laplace Pyramids?
I found only articles assuming you know what it is and not define it, can someone please define what is it and what it is used for?
The reference used is Seamless Image Stitching in the Gradient Domain
|
What are the peak detection algorithms in existence? I have noisy data, and I would like to implement peak detection for this data. Data is in reverse, actually I am trying to determine the bottom.
Here is a snapshot of the data in Excel. I like to detect both bottoms. I thought about passing the data through a low-pas... |
I would like to know the relation between the parameters $\{\omega_k,A_k\;|\;k\in\mathbb{Z}\}$ of a series $\sum_kA_ksin(\omega_kx)$ and a related series, for example, $\sum_kA_k^2sin^2(\omega_kx)$.
I would also like to know why a multiplicity of peaks appears in the FT when the components of a series are raised to som... |
How are the descriptors in the BRIEF algorithm matched to each other?
How is the template image found in the another image? How do we compare the descriptors?
I have read that article but didn't understand how they have done it.
They wrote that they compared descriptors by using Hamming distance, but how is invariance ... |
I have a system where I sample some data periodically (every 10usec). The shape of the data is triangle, in other words it linearly increases and decreases in time. (Both theory and practice are in agreement, I plot the ADC output and I clearly see linear increase and decrease although there is some non-linearity but l... |
I was looking in the Android app store for a guitar tuner. I found a tuner app that claimed it was faster than other apps. It claimed it could find the frequency without using the DFT (I wish I still had the URL to this specification).
I have never heard of this. Can you acquire an audio signal and compute the frequenc... |
Assume I have an array of floating points that contain the last 8192 samples played. How would I convert that array to 32 frequency bins that are spaced from 0Hz - Nqyst?
|
Consider this MATLAB code:
mg=imread(........bmp');
level=graythresh(mg);
x=im2bw(mg,level);
figure,imshow(x);
BW2 = bwperim(~x);
figure,imshow(BW2);
operating on this image (NOTE has white margin, see here):
The result was (original link here):
How can I remove the white pixels from the second image and then o... |
I am a junior high school student who has a general fascination for electronics, programming, and the like. Recently, I have been learning about signal processing.
Unfortunately, I haven't done much calculus yet (forgive me), so I am a little fuzzy on things.
If you were to compute the DTFT of a signal, what would be... |
I have seen this equation:
$$
\Pr({\epsilon}) = Q({\sqrt{2E_b/N_0}}) \,.
$$
where these definitions hold:
$$N_0/2 - the \ spectral \ density \ of \ white \ noise$$
$$E_b = PT_b - the \ energy \ per \ transmitted \ bit$$
$$P - Power $$
$$T_b - the \ time\ the \ bit\ transmitted \ in$$
Q - is (this) function, how do... |
What image analysis techniques can I use to extract the traffic signs from an image such as the one below?
Edit:
After Anisotropic diffusion: The background that i don't want gets cleared a little
After Dilation :
Thresholding after Diffusion : Not able to figure out the best thresholding for this purpose
However ... |
Hi I am a little confused on what the notation of the following statement means.
$$ H_{k}(z)= H(W_{4}^{k} z), k = 0,...,3$$
It comes from a question in which I have designed a FIR low-pass filter $H(z)$ and my goal is to implement a DFT filter bank scheme like this:
Exchange $P(z)$ for $H(z)$ and k would correspond to... |
In the field of Gesture Recognition and Speech Recognition (using HMM classifiers), do multiple HMM classifiers (one for each class) share common Codebook (i.e common set of symbols) in Vector Quantization?
If that is not the case, how does the test/classification stage work?
To which Codebook the test input vector be... |
I am trying to produce ideal anisotropic diffusion outputs using the standard lena image. Using the first coefficient , the output is coming somewhat close to ideal ouput but when I increase the kappa value the bluring increases. When I am using the coefficient that prefers wide area diffusion over small areas,my outpu... |
The impulse response is $h(t)=e^{-t}u(t)$ and input signal is $x(t)=1 + \frac{1}{2}cos(400πt)$
I want to find y(t)..
I tried to use $\int^{\infty}_{-\infty} h(τ)x(t-τ)dτ$ ,however i know that $\int^{\infty}_{-\infty} h(t-τ)x(τ)dτ$ is equal.
Is this the correct formula?
I tried to solve it but couldnt find come up ... |
I have chain contours representation:
- classic Freeman chain
- angle chain with distance (first: angle between neighbor points, second: distance between them)
What are the best techniques to match them, and If it is possible figure out rotation of element?
For now I tested approach with FFT(isn't it overuse for sho... |
I have this image:
After many preprocessing operations, I obtained this image
my goal is implementing one to many matching on my images for recognition purpose,i have 250 image for 50 persons (5 image/person) ,they are represented as: 0001hv1,0001hv2,0001hv3,0001hv4,0001hv5,0002hv1,....... , now:
i ask if i can co... |
I have a couple of questions regarding windowed FFTs:
Why is the noise floor higher with windowed FFTs (according to Wikipedia's spectral leakage page, anyway), when the whole point of windowing is to reduce side lobes?
I realize that different windows are better for different things, but is there a window that is con... |
I have consulted the almighty oracles of google and wiki, but I cannot seem to find a definition for the phrase "the moment of the spectrum".
A legacy work text I am reading uses it in the following manner, defining the number of zero-crossings per unit time as the following:
$$ N_0 = \frac1{\pi} \left(\frac{m_2}{m_0}... |
I have the following image
and after thresholding it, I obtained this result:
How can I remove all white pixels which do not belong to the original image?
The desired output should look like this (I manually edited the image):
|
What is the best filter for removing Gaussian noise without destroying the edges? I am using the standard Lena images with additive Gaussian noise and I want to denoise before applying anisotropic diffusion. I don't want to median filter because edges become blurred. I tried adaptive filtering but results were not sati... |
I have Analog to Digital converter from which I get data of measurements of 1kg load.
The aim is to model the simple spring-damper system, so that after entering correct initial data (x[0] = a, x'[0] = b) the model will give almost the same data as the original data from converter.
It is my first modeling attempt of a... |
I'm attempting to use a filter to scale an image and for the most part, I have something that appears to work. But now I want to be able to generate a filter with an optimal number of taps. I know in general that the more taps, the better. But there are diminishing returns in how much each additional tap will increa... |
I have been experimenting some weeks to find a way to match/find similar Songs in a Library containing different Genres of Music.
My first try was to Detect Features like Tempo or how much Bass there is in Songs to form groups, but I didnt get far with this approach (Volume Changes Based Beat Detection) since on about ... |
Is it possible to determine the resulting pixel values and modify them before the compressed jpeg image is actually created?
For example, I'm at the stage where I already have the quantized DCT coefficients of the original image and I want to change all pixels of the resulting image with a (255, 255, 0) value to (255, ... |
I'm creating an app (I'm a software developer) that for different sounds (interjections from the user) will do different things.
For example if the user says:
"Tiu", than it will do task A,
if it will say "Tou" than it will do task B.
In digital sound, what's the difference between sound (user interjection) "Tiu" and ... |
I created the lowpass filter
h = firls(100, [0 .2 .25 1], [ 1 1 0 0],[.001 60]);
My goal is to get four filters $H_{k}(z) = H(W_{4}^{k}z) k =0,1,2,3$
From my knowledge to get the polyphase components you would do the following
$H_{0}(z) = \sum h(4n)z^{-n}$
$H_{1}(z) = \sum h(4n+1)z^{-n}$
$H_{2}(z) = \sum h(4n+2)z^{... |
in my program there are stereo cameras. The cameras were stereo calibrated. I have a set of 2D-Points from left image (for example, it could be some Harris Corners from left images). And the task is to estimate 3D position of this points with the reference to left camera. I started first with the estimation of correspo... |
The images given below are a result of fruit defect detection algorithm i have made myself...
Just wanted to know is there a way of outlining these defects?
Original image 1:
1st Image:
Original image 2:
2nd Image:
What i want to achieve is this :
=> 2.
|
The properties aren't entirely clear to me, sorry for the basic question.
I know the Fourier Transform of one function. Say, $\text{rect}(x,y) \Leftrightarrow \frac{\sin \pi u}{\pi u} \frac{\sin \pi v}{\pi v}$. Now, I have some related function and I want to easily get the FT based on simple properties.
For exampl... |
I'm looking for a formula to effectively compress an audio waveform to limit peaks. This isn't an "automatic volume control" application where one would control amplifier gain to maintain a volume level, but rather I want to limit ("soft" truncate) individual peaks. (I know this introduces harmonics, but I'm trying t... |
How to find MOD-2 Circular convolution for the two sequences $h =[-1,3,-2,1]$ and $x = [1,-1,-2,1,3,2,1,2]$.
I know the answer is $7$ $0$ from matlab but I don't know how to find it graphicly or mathematically
|
I have a 3D shape in a 3D binary image. Therefore, I have a list of all of the x,y,z points. If I am to analyze this shape for various identification, such as "sphericity", volume, surface area, etc., what are some of the choices do I have here?
|
Heads up, this is for homework. I never took a signals and systems course, so I'm behind on this stuff.
I want to compute the convolution of two rectangular regions. I know the standard equation for convolution, where the integrals are from $-\infty$ to $\infty$, but it is useful to restrict the integration to the ... |
I am trying to understand the real DFT and the DFT and why the distinction exists.
From what I know so far the DFT uses $e^{i2\pi kn/N}$ for basis vectors and gives the representation $$x[n]=\sum_{k=0}^{N-1}X[k]e^{i2\pi kn/N}$$ The sum is written from $k=0$ to $N-1$ for historical reasons I think instead of writing it ... |
I am reading "The Scientist and Engineer's Guide to Digital Signal Processing" and trying to understand Figure 3.5 below which is about the sampling theorem and aliasing.
I do not understand the picture of the frequency domain. The signal can be represented as
$$f(t)=\frac{1}{2\pi}\int_{-\infty}^{\infty}F(x)e^{ixt}dx$$... |
I am trying to think how can I program a SW that can recognize Chords on the fly.
since I know nothing about music, Can I assume that the chords are orthogonal and unique? I guess I can since it is linear combination of sinusoidal signals in different frequencies.
a. What is the rate I have to sample the song?
b. Are... |
Could someone please answer me why the simulated performance (using matlab) of a Hamming code over a binary symmetric channel does not fit exacly with the theoretical?
Here is my code:
clear all
n=15;
k=11;
I=eye(k);
%define the parity matrix for the hamming code
P=[1 1 0 0;1 0 1 0;0 1 1 0;1 0 0 1;0 1 0 1;0 0 1 1;1 ... |
I would like to implement an algorithm that synchronizes two audio tracks.
The two tracks are very similar; you can imagine they are two recordings of sound (not necessarily music) from two microphones in the same room. This means they appear as one signal that passed through two different (linear) channels, with diffe... |
I want to identify Egyptian car number plates that look like this:
How can I do this in Java ?
I plan to do this in Android, as the user will catch the number plate with a camera and the results will be submitted to server.
|
For full disclosure, this is related to homework. I have to find the Fourier Transform of a function that I've boiled down to the following.
I have a function $f(x,y)$ that I can think of as another function $g(x,y)$ plus a stretch and rotation. (For example, think of turning a circle into an ellipse). So, I have a ... |
I am designing a High pass Digital filter. I calculated the filter coefficients using fdatool and got some negative filter values.
Now, I need to convert them into values from 0 to 255.
In case of low pass filter , I used
value = value*255/sum(value)
I have heard that same needs to be done for negative coefficients ... |
I use MFCC algorithm for calculation of Mel-frequency coefficient for 2 files and DTW algorithm with Euclidean distance for finding similarity. I have results values around 400-600 on the files with the same word (cut from recorded speech of the same person). Is it right? Or I have a mistake in my implementation? I did... |
I'm trying to write a code The helps me in my biology work.
Concept of code is to analyze a video file of contracting cells in a tissue
Example 1
Example 2: youtube.com/watch?v=uG_WOdGw6Rk
And plot out the following:
Count of beats per min.
Strenght of Beat
Regularity of beating
And so i wrote a Matlab code that wou... |
these are example of my image
i have a 245 images similar to it ,i obtained these b/w images after preprocessing stage , i want to use them for recognition persons(not verification) in matlab. can i performe matching algorithm on these image after division into 2 group(one for training and the second for testing) ... |
I am trying to find a list of possible image features like color, oriented edges and so on for measuring their usability in case of finding same/similar objects in images. Does anyone know such a list or at least some features?
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