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Questions tagged [segmentation]

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How to find abrupt changes on a noisy non-periodic 1d data curve

I have a set of some 5000 x,y datapoints. They plot a smooth curve with large gradient and curvature at the right. There is high-freq noise that varies in amplitude from dataset to dataset, but the ...
Radim Cernej's user avatar
2 votes
1 answer
45 views

How to segment an image using a set of imperfectly drawn boundaries?

Consider the following image: This is an image of a set of contours (the "contour image") that was drawn by a human using a mouse on another image (the "original image"). FWIW, ...
nben's user avatar
  • 123
1 vote
1 answer
96 views

Can I apply an hilbert transform on a signal in subsegments [windowed hilbert transform?] [duplicate]

Consider I have a signal x which has N samples, N being a very large number. Could I create y, the analytical signal of x, by ...
Mart's user avatar
  • 195
0 votes
0 answers
30 views

Segmenting audio in its different parts using deep learning

I am trying to segment a song into its different parts. In pop music, it's common for a song to have a verse and a chorus. And they repeat. So it should be possible to use deep learning to find the ...
Tria Ufo's user avatar
5 votes
0 answers
470 views

Extracting audio segments based on detected onsets using libROSA

I have a couple of .wav sound files with very similar percussive signals of ~60ms duration. I can identify their onset times using libROSA's onset detection quite well. I would now like to extract the ...
VGF's user avatar
  • 79
2 votes
2 answers
2k views

Modern Method for 1D Signal Segmentation

I want to segment a signal in an unsupervised manner. The data is a 1D signal which has different segments which I want to be able to segment automatically for farther processing. I am looking for a ...
Mark's user avatar
  • 367
1 vote
1 answer
51 views

Signal segmentation into states ( Stop/mov)

My question concerns signal segmentation. My signal is the green one, which represents the distance from the first point to the rest of points. I would like to cut the trajectory into segments that ...
Mouna 's user avatar
  • 13
0 votes
1 answer
153 views

I have the following accelerometer signal, I want to segment or slice the signal into Red parts and Green parts

I want to count steps which are basically represented by peaks in the signal. the red part in the signal doesnt correspond to any walking activity, I want to ignore them. Any help on segmenting or ...
Naima Abiad's user avatar
0 votes
1 answer
60 views

What does $I_{seg}$ in 3GPP TS 38.212 version 15.2.0 Release 15 represents?

I'm working on 5G NR, whereby on reading Code block segmentation and code block CRC attachment given in Subclause 5.2.1 of 3GPP TS 38.212 version 15.2.0 Release 15. What does $I_{seg}$ represent?
Meet's user avatar
  • 95
2 votes
1 answer
5k views

Comparison of results own implementation and python signal.welch

I am trying to replicate the output of Python's signal.welch function to make an estimate of the PSD from an FFT calculation. I don't want to use the built-in function to understand better what is ...
WhyCFD's user avatar
  • 23
-1 votes
1 answer
93 views

How to separate silence from frequencies in Matlab

For a project, I was asked to create a DTMF detector on Matlab. I know that the audio sample that will be provided will have 4 tones maximum, possibly less, and that the audio begins with a 0.1 second ...
rddead's user avatar
  • 3
0 votes
1 answer
127 views

Good way for segmenting this signal

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
  • 255
0 votes
1 answer
2k views

How to extract a smooth contour from a set of points in 3D?

I am trying to segment a 3D volume. The outcome of all my volume segmentation algorithms is a set of candidate points in 3D space. Now I need to smooth this point cloud and fit a closed surface it. My ...
MJay's user avatar
  • 467
0 votes
1 answer
97 views

How does reconstruction function relate to watershed segmentation?

I'm trying to understand how watershed work by reading The Morphological Approach to Segmentation: The Watershed Transformation S. Beucher and F. Meyer This document mentions the reconstruction ...
Tuan Nguyen Dinh's user avatar
3 votes
1 answer
156 views

Is deep learning the only way to detect humans in a picture?

I'm looking for a way to detect humans in a picture. For instance, regarding the picture below, I'd like to coarsely determine how many people are in the scene. I must be able to detect both standing ...
avazula's user avatar
  • 156
1 vote
0 answers
39 views

For extracting the characteristics of the signal what minimum duration should be considered?

Being non signal processing student I have a limited understanding of concepts. I have a continuous periodic bearing faulty signal of 10 seconds duration sampled at 12 kHz. So I have 120,000 ...
Raady's user avatar
  • 345
0 votes
0 answers
170 views

Machine learning to find an optimal set of parameters for a segmentation algorithm

Using machine learning to find an optimal set of parameters for a given segmentation algorithm. In the "classical" case of machine learning, in the training phase, the data set is constant and the ...
Dov's user avatar
  • 265
1 vote
1 answer
2k views

How to compute number of samples in 1 cycle of signal?

I have 3 signal sampled at 12 KHz frequency obtained from a motor rotating at constant 2000, 2020, and 2040 rpm. For 1 second signal recording I have 12,000 time samples. Depending on the frequency I ...
Raady's user avatar
  • 345
0 votes
1 answer
147 views

Kullback-Leibler Distance of Spectral Data

I am currently reading through Music Structure and Analysis from Acoustic Signals and am having some difficulty in understanding how the modified Kullback-Leibler distance is calculated. (I am just ...
SFX's user avatar
  • 5
2 votes
0 answers
142 views

Help Understanding Radial Gaussian Filter

I am currently reading through Mueller's "Fundamentals of Music Processing" and I am trying to understand audio segmentation through the use of self-similarity matrices. Currently, my matrix looks ...
SFX's user avatar
  • 21
0 votes
1 answer
3k views

How to segment frequency bands after FFT and calculate power?

I have been working with EEG signal. I have raw EEG data for a 2-second (i.e. $t=2$) duration. My objectives are: Transforming these raw data from time domain to frequency domain. Segmentation into ...
user25290's user avatar
0 votes
1 answer
108 views

Number segmentation techniques

Assume that the speed limit at a place is captured and is provided as an input to a system which checks if the speed of vehicle is above the accepted level or not. For checking, the number in the ...
1010101's user avatar
  • 153
-1 votes
2 answers
1k views

segmenting an EEG data

I have an EEG labeled data, which is the data that used for training, And I want to segment those data based on the time of EEG signal (Time-based Epoching) as a preprocessing step, based on the ...
user2162652's user avatar
1 vote
1 answer
560 views

How to segment object when it has similar histogram with background

I am working in image segmentation and I would like to ask you something about my problem. I have a image such as bellow. I want to segment leopard from background. However, intensity information is ...
John's user avatar
  • 585
1 vote
2 answers
365 views

Image Segmentation - Berkeley Dataset

I've been given an image from Berkeley dataset to segmentate. I am an undergrad student and so far I threw everything i know to this thing. But the colors are extremely close. I tried; Clustering ...
Mert Çelikok's user avatar
1 vote
0 answers
2k views

how to get segmented OPTIC DISC from retinal image?

i have been segmented some image of retina. but the result is not good as i hope. for one image i can get good segmentation, like this image my code is from some reference in internet, in below i ...
Ruslan Wahyudi's user avatar
0 votes
1 answer
78 views

Segmenting a sound file before each of its attacks

Like the title says... I want to split audio file where a single instrument is played (not so fast)... I just need to detect the attack phase of the waveform to know where a played note begins. Can ...
Alexander's user avatar
4 votes
1 answer
2k views

Segmentation and Labeling of White Blood Cells

I am trying to segment and label white blood cells from this image: Using K-Means I managed to segment most of what I wanted: But as you can see, there are some cells connected to each other which I ...
user3148616's user avatar
1 vote
1 answer
98 views

What are the Segmentation algorithms that can be used to process Satellite images (obtained from Google Earth) to segment forest and barren areas?

I have tried Region based Segmentation - through Seed Growing, Watershed algorithm, and Graphcut algorithm, but none have been successful so far. I am using MATLAB.
shreelock's user avatar
  • 171
1 vote
0 answers
561 views

Segmentation based on peak values

I have a 2D array/matrix (something like an image, but it's not an actual image) with values from 0 to X (in this case 180). and I have a 1D array/Vector that has the occurrence frequency of these ...
Reem's user avatar
  • 133
1 vote
1 answer
423 views

Speech / Audio Separation

I'm looking for a way to implement a Speech Separation from a .wav file. Let's say I have a .wav signal containing the following words: "The cat flew away" Now I ...
Phorce's user avatar
  • 485
2 votes
1 answer
374 views

Speech segmentation for speaker recognition

I'm trying to implement a speaker recognition system and want to make sure I'm aware of the latest trends in speech segmentation. I've read a number of very different methods at a higher level but I'm ...
wheresmycookie's user avatar
3 votes
1 answer
222 views

Perceptually Corresponding Error Map

Is there any better measurement of error between two images than just taking pixel value differences? The problem I am tackling is stitching images containing "sensitive" objects, such as moving ...
Libor's user avatar
  • 4,255
8 votes
1 answer
6k views

How do I evaluate the performance of a segmentation algorithm?

I'm currently on a project of liver tumor segmentation. I segmented the liver using region growing, and I have to assess how accurate the result is. I recently learnt that there are certain metrics ...
Gomathi's user avatar
  • 421
7 votes
1 answer
1k views

What segmentation methods can be used for simple images?

As related to the project I am currently involved in, I have come to realize that one thing that might help is for me to 'segment' my image. To that end, I have shown a very simple example below. ...
Spacey's user avatar
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