Highly Voted Unanswered Questions

13

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Will an Unscented Kalman Filter Be "As Good" as Other Optimization Algorithms for This Problem?

I want to calibrate a tri-axis magnetometer when a tri-axis gyroscope is also available. I am fairly certain I can solve this problem using various optimisation algorithms, but I would prefer to use ...

answered Sep 16 at 13:50

casualcausality

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10

votes

0answers

1k views

Ensemble learning, multiple classifier system

I am trying to use a MCS (Multi classifier system) to do some better work on limited data i.e become more accurate. I am using K-means clustering at the moment but may choose to go with FCM (Fuzzy c-...

matlab statistics

modified Sep 4 '17 at 16:28

Farewell Stack Exchange

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9

votes

3answers

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First order low pass filter

I am trying to better understand the first-order low pass filter: Summary: Per wikipedia, a first order low pass filter yields the following in discrete time: $$ \frac{Y(s)}{U(s)}= \frac{\omega_{c}}...

discrete-signals lowpass-filter z-transform bilinear-transform

modified Sep 15 at 1:01

Community♦

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9

votes

0answers

1k views

Help in Retraining a HOG Descriptor using SVMLight

I am currently trying to count cars using OpenCV 2.4.4 with a HOG descriptor. Because a model for car detection is not available in OpenCV, I am creating my own model using SVMLight and a dataset of ...

computer-vision opencv detection

Nov 24 '13 at 15:56

jonsca

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7

votes

0answers

110 views

Converting very short "motionless" video frames to single, better-resolved, images

I made a mistake with my newly bought compact camera, before a trip to Japan. Instead of taking single pictures, I ended up with a few short "MP4" video files (1 second, 2-3 frames). I could ...

image-processing video-processing video-compression superresolution image-restoration

modified Jun 28 '20 at 17:32

Laurent Duval

27.4k3 gold badges25 silver badges87 bronze badges

6

votes

3answers

531 views

Efficient calculation of correlation function every $N^{\rm th}$ point

I would like to calculate a long correlation function of length say, 1e6 points. I have a prior knowledge that the correlation peak will be in point k*1000. Is there an efficient way to apply this ...

fft autocorrelation cross-correlation ifft

modified Jul 25 at 0:01

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1

6

votes

1answer

302 views

Analytical Expression for Convolution of Two 2D DFTs

I am trying to do an image analysis problem on some images, and I want to calculate some things in the frequency domain which are giving me problems. Say I have an (discrete) image $I(x,y)$ of size $...

image-processing dft convolution

modified Jul 13 at 12:02

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6

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Jacobian Matrix of a Quaternion $q$ respect to Angular Velocity $\omega$

In the context of visual tracking and video processing I need to estimate variations of the orientation related to the angular velocity. I am trying to calculate the Jacobian matrix of a quaternion $\...

computer-vision

Jul 13 '12 at 15:33

Jav_Rock

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180 views

EWMA based differential that is strictly positive on strictly increasing irregular time series?

Let's say I have a time series $ \{t_i, x_i\} $ where the $x_i$ are strictly increasing and the $t_i$ are not regularly spaced. I can define a differential operator as $$ \Delta_i = \frac{x_i-x_{i-1}...

discrete-signals

Oct 31 '11 at 19:04

Brian B

1613 bronze badges

6

votes

1answer

1k views

How to choose a windowing function when performing a Chirp $\mathcal Z$-transform?

I've got some data sampled at 32 Hz. The only interesting stuff is happening between about 0-8 Hz and I've got to do real time batch processing and detect events with a delay of no more than a second. ...

fft

modified Jan 2 '19 at 20:13

J. Oppenheimer

1

5

votes

0answers

80 views

Is the Wiener filter operating at the Cramér–Rao bound?

I have been told (Wikipedia agrees) that the Wiener filter is optimal when signal and (additive) noise are WSS. Optimal in the sense that it minimizes the mean-square error. The Cramér–Rao bound is ...

estimation parameter-estimation linear-prediction wiener-filter

modified Jan 27 at 21:37

fabian_pedd

513 bronze badges

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78 views

Efficient Convolution Without I/O Delay (Gardner 1995) implementation

I am trying to perform real-time convolution on an audio stream using a fairly large FIR for convolutional reverb. I found a great paper explaining how to do just that: Gardner, 1995. But, I'm new to ...

audio convolution fast-convolution

asked May 2 '20 at 15:50

QuinnFreedman

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votes

0answers

172 views

Residual error when setting measurement matrix in compresssive sensing

I have an issue when implementing compressive sensing to recover sparse vector. Assume I have sparse vector $x$ of length, for example, $(256,1)$. $x = [x_1,x_2,.....x_{256}]$. This vector is ...

image-processing matlab estimation compressive-sensing

modified Mar 26 '20 at 10:01

Gze

4952 silver badges8 bronze badges

5

votes

1answer

160 views

What are the properties of continuous-time improper systems?

I am trying to better understand the properties of improper systems $H(s) = \frac{b(s)}{a(s)}$, for which the order of the numerator $b(s)$ is greater than the order of the denominator $a(s)$ (in the ...

linear-systems laplace-transform stability causality

modified Jul 2 at 21:03

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5

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55 views

Minimum statistics noise estimate - how to calculate the underestimation factor?

I have implemented a basic noise estimator using the minimum statistics method. Noise power estimate is obtained as a minimum of the short time power estimate within a window of subband power samples. ...

signal-analysis fourier-transform noise noise-cancellation

modified Dec 12 '19 at 9:05

Danijel

4634 silver badges13 bronze badges

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Unanswered Questions

Will an Unscented Kalman Filter Be "As Good" as Other Optimization Algorithms for This Problem?

Ensemble learning, multiple classifier system

First order low pass filter

Help in Retraining a HOG Descriptor using SVMLight

Converting very short "motionless" video frames to single, better-resolved, images

Efficient calculation of correlation function every $N^{\rm th}$ point

Analytical Expression for Convolution of Two 2D DFTs

Jacobian Matrix of a Quaternion $q$ respect to Angular Velocity $\omega$

EWMA based differential that is strictly positive on strictly increasing irregular time series?

How to choose a windowing function when performing a Chirp $\mathcal Z$-transform?

Is the Wiener filter operating at the Cramér–Rao bound?

Efficient Convolution Without I/O Delay (Gardner 1995) implementation

Residual error when setting measurement matrix in compresssive sensing

What are the properties of continuous-time improper systems?

Minimum statistics noise estimate - how to calculate the underestimation factor?

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