Questions tagged [signal-processing]

For questions about processing data from sensors (e.g., audio and video data), and *not* handling operating system signals. Note that there is also a dedicated [Signal Processing Stack Exchange](http://dsp.stackexchange.com/), which may be a more appropriate venue.

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Does the illumination color (red/blue/green) has any effect over the disparity map generated from a stereo image?

I have a working model that creates a disparity map using stereoscopic image processing using opencv. I am thinking of improving the disparity map by using illumination and stuck with different ...
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Correct way to downsample a high-res image with jitter?

I'm new to image processing and I'm trying learn about image AA and upsampling algorithms such as those used in game engines. Engines tend to use jitter in order to get multiple samples from the same ...
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Understanding Dynamic Frequency Warping (not Dynamic Time Warping)

I am implementing a paper which need Dynamic Frequency Warping as a component. They have written very briefly about this algorithm and cite to this paper: Voice transformation using PSOLA technique (...
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generalized translation operator on graph [closed]

David IShuman in " vertix-frequency analysis on graph" claims that,"we generalize one of the most important signal processing tools – windowed Fourier analysis – to the graph setting and When we apply ...
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Generate higher dimensional pink noise

1D Pink noise, is easy enough to generate. See https://www.dsprelated.com/showarticle/908.php for example. What about higher-dimensional pink noise, such as 2D or 3D pink noise? Is there an algorithm ...
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49 views

Compute unknown matrices that minimize a sum

This problem is about working with smart-phone accelerometers. To calibrate accelerometer, I need to find three unknown matrices T, K and B that minimize this sum: $$\sum_{i=0}^N(|g|^2 - |TK(a_i + B)|...
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92 views

spike/peak removal/interpolation

I have some signals that look like following: I would like to remove the two peaks by doing linear interpolation, so I can get something like this: where the orange line segment should replace the ...
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28 views

How much data can be send in 1 minute of audio with Smartphone speakers / microphones?

Having the current news about Google Assistant in mind, I thought that robots might use interfaces designed for humans to send data. Like a telephone interface. Then I wondered: What is the maximum ...
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61 views

Intuitive way to understand “Run-Length Encoding”

Run-Length Encoding is the simple form of lossless data compression in which compression in which runs (execution) of data are stored as a single data value and count rather than as the original run (...
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113 views

RNN learning an iterative algorithm

How do I solve the following problem with a recurrent neural network (RNN)? What architecture should I use for the (conv)-RNN? Let $s \in \mathbb{R}^N$ be a musical signal. We corrupt it with ...
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48 views

How are similar bits separated? [closed]

A 1 is an "on" signal, and a 0 is an "off" signal. How does a computer know 01110 is different from 010? Does the computer wait between signals?
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Continuous Mutual Correction from Multiple Sensors

I'm stumped on what exactly to search for; so here is a non-scientists description of the topic. I've got multiple sensors of different types that are measuring the same physical value in different ...
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1answer
771 views

Compare phase and magnitude spectrum results of 2 Images

I have read that from Fourier transform we obtain magnitude and phase spectrum. The magnitude spectrum tells you how strong are the harmonics in a image and the phase spectrum tells where this ...
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Entropy of residuals and noise

Relation of Entropy and SNR : Based on this question and answer, I had another question that struck me and I am curious to know, if somebody can shed some light, on the following situation: $y= ...
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1answer
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Convolution of Haar filter [closed]

In "Conceptual Wavelets" (2009) by D. Lee Fugal, on pg 47 he writes Conv ([-1, 1], [1, 1]) = [-1, 2,-1] When I do it I get ...
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351 views

Algorithms that are similar to Dynamic TIme Warping

Dynamic time warping (DTW) is an algorithm in time series analysis for measuring similarity between two temporal sequences which may vary in time or speed. Here are some explanations of DTW: Dynamic ...
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1answer
68 views

What is the signal going from the computer to the screen? [closed]

Im sorry if it is a weird question, but I cant seem to find an answer for this. What does the signal going to the screen look like in more abstract sense? Does it code the values of each pixel in a ...
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770 views

What are all the differences between the Gibbs phenomenon artefects and JPEG artefacts?

I thought the Gibbs phenomenom is the result of Fourier analysis estimation (but was it Fourier Series estimation or can it also be Fourier Transform estimation?) JPEG uses the Discrete cosines ...
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3k views

Which algorithms are usable for heatmaps and what are their pros and cons

This is a cross post from Stack Overflow, and DSP at Stackexchange since I cannot really decide which part of Stackexchange is most fitting. If this is the wrong place please tell me and I'll remove ...
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Stream processor definition

I'm looking for an actual definition of a stream processing unit (SPU), preferably sourced. The context is not specifically graphics cards. I can find many, many articles explaining what they contain,...
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106 views

Help understanding an audio processing algorithm

I'm reading “Speech segmentation without speech recognition” by Dong Wang, Lie Lu and Hong-Jiang Zhang. The algorithm I'm looking at is a V/C/P (Vowel/Consonant/Pause) classification algorithm on a ...