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Signal Processing

Questions tagged [thresholding]

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65 questions
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I have a raw IQ file capture with rtl_sdr -f 1090000000 -s 2000000. I want to get the ADS-B message from it. I understand the basic of I and Q value, I normalize it ...
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I'm simulating a detection system where the input is a power spectral density (PSD in dBm) distorted by noise. The goal is to evaluate how the probability of detection evolves with different levels of ...
Student-qeùtf's user avatar
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1 vote
0 answers
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I am trying to mathematically prove that for an initial choice of threshold To, if we compute the successive thresholds as average of foreground and background means, the thresholds will follow a non-...
Curiosity's user avatar
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1 vote
0 answers
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I was reading a paper where they applied a hysteresis thresholding to help with segmentation of vessels in an image. It provided a formula to determine how to select a hard threshold (Th), which ...
user65580's user avatar
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4 votes
3 answers
903 views

I am currently implementing an acoustic communication system in Matlab. For synchronization purposes, every transmission contains an upchirp preamble. The receiver uses cross-correlation to find the ...
F105's user avatar
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1 vote
1 answer
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I'm working on 2D array analysis or an image analysis and get to know the different block of peak values marked "circle" in attached plot [e.g. 2*2 matrix] of the 2D array [as shown in Fig. ...
CEB's user avatar
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I'm a beginner in image processing and I have to create a segmentation algorithm to detect lungs from an image . Image given : And after removing the noise from the image and applying a threshold the ...
bill's user avatar
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-1 votes
1 answer
2k views

I implemented a version of a CFAR average in MATLAB but it's 'slow' and I need to speed it up. I included the pseudo code and logic below. I used a nested for loop to calculate the moving average but ...
hwhorf's user avatar
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1 vote
1 answer
1k views

I'm trying to solve the following exercise: Given a system that transmits bit $b$ with probability $p_b$ and $-b$ with $p_{-b}$ and the transmission is degraded by AWGN $N(0,\sigma^2)$. What is the ...
tir_nor's user avatar
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1 answer
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I am analyzing some program responsible for detecting the correct signal in the channel on the receiver side. It seems to me that such an implementation allows for the detection of the correct packets ...
MagicMan's user avatar
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1 vote
1 answer
107 views

I'm thinking of pixelize + threshold, but I need a more formalized way of finding the darkest spots on the photo, with tweakable parameters. Something I can think of is the parts with lowest spatial ...
ivan866's user avatar
  • 111
0 votes
1 answer
813 views

I have seen number of approaches that have been introduced in the literature for spike detection including, amplitude thresholding method, Nonlinear Energy Operator method, and template matching ...
Tyesh's user avatar
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4 answers
479 views

I'm trying to analyze the following signal: My aim is to select the high-amlitude oscillation parts limited by the red stars. At the beginning, i have tried to set a threshold and keep only the ...
Arrais's user avatar
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1 vote
1 answer
146 views

I want to segment the following signal (units are x: [px], y: [a.u.]) and need a good way to do so. I want to achieve the following: I am only interested in the two wide "plateaus" with maximum value (...
packoman's user avatar
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60 views

I have a noisy signal that roughly switches between two distinct amplitude levels, i.e. looks like a pule train with irregular pulse with and small variations in the "on" and "off" amplitude over time,...
Peter's user avatar
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