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Questions tagged [background-subtraction]

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0
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2answers
61 views

Need help cleaning noise

I have been recording sound sample from mouse vocalisations and noticed that a background noise appeared in the recording room. the noise is clearly visible in the spectrograms of the recordings as ...
0
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1answer
116 views

Chroma key algorithm with unknown background color

Suppose that I have an image with a foreground subject and a monochrome background. The image is a real world picture so the pixels belonging to the background do not share the same exact value. I ...
3
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3answers
75 views

Why do we substract a background image and not divide it?

Subtracting a background image for background correction is the standard way of doing background correction to obtain the foreground. I am wondering if there are situations, where it would make sense ...
1
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1answer
388 views

Real time background noise reduction or removal

I am trying to build a real time simple audio recognition that can recognize few keywords. Following this tensor flow tutorial i was able to train a simple neural network. Currently the signal flow ...
0
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1answer
24 views

Producing masks from mostly-static-background subtraction when given the background

My data set contains a number of high resolution greyscale images containing a person's face. A single image containing the background without the face is provided. The background is mostly static in ...
1
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0answers
72 views

Subtracting audio signal emitted - trying to use spectral subtraction to localize moving objects

I am a Software Engineer without much signal processing background and currently spending and experimenting to get use to it. My scenario: Assume a speaker and a microphone array. A speaker emits an ...
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0answers
80 views

How to remove echo/reflected-sound caused by stationary objects when building a ultrasound based radar

I am emitting ultrasound with a speaker and am trying to track moving objects with a microphone array by detecting doppler shifts. I have succeeded to detect movement. However, to detect the direction ...
0
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1answer
536 views

FFT Background subtraction in MATLAB

Using MATLAB I need to subtract the background files from the real signal I am trying to measure. We took data of just the background noise prior to driving the system with some voltage, so we do not ...
0
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1answer
134 views

Removing noise from Signal captured by Laptop Sound Card using Mic In (4-pole Audio Jack)

I am new to Signal Processing and I need a bit of help. I need to capture an Audio signal using the laptop Sound card. But before I captured the actual signal, I tested for the noise levels. ...
3
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0answers
682 views

How to remove a common noise signal from a set of signals?

I have 2D measurement results which seem to have a constant non-trivial background as shown here: For every column in this image, there seems to be a similar oscillation. I'd like to distinguish this ...
2
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3answers
105 views

Background averaging not working

I'm working on a problem where I'm trying to use background averaging to see what the frame looks like in a beehive behind the bees. I've been trying to use standard averaging (I take an image every 1 ...
0
votes
1answer
689 views

How does spatially white noise differ from diffuse noise

In noise reduction, having read that directivity index is used to reduce diffuse noise and white noise gain reduces spatially white noise, I would like to know the difference between both the noise ...
1
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0answers
119 views

Image Subtraction using Pre-bayer data (.pgm)

Not sure if this is the best stack exchange but I'll give it a shot. I am performing background subtraction to collect Electroluminescent emission (i.e image w/ emission - image w/o emission = ...
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0answers
867 views

What is spectral subtraction? [closed]

I have to write some simple examples in Matlab which use spectral subtraction. These examples will be included in a paper to help a friend understand spectral subtraction. But I don't know where to ...
0
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0answers
34 views

How the weight $ω_{i,t}$ is initialized in Background subtraction GMM (Gaussian Mixture Model)?

I read Chris Stauffer paper "Adaptive background mixture models for real-time tracking" about Gaussian Mixture Model for background subtraction, but they're not explained very detail about $ω_{i,t}$ ...
1
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0answers
52 views

Is it correct to call this Gaussian Mixture Model?

Some poeple claim their background subtraction algorithms use Gaussian Mixture Model, but when I read the code, I find they actually use only one component, and as a result EM algorithm (or its ...
1
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1answer
206 views

I have some questions about background subtraction with Gaussian Mixture Model (GMM)

I'm learning about Gaussian Mixture Model (GMM) for background subtraction.. And have some questions about it.. In Chris Stauffer paper "Adaptive background mixture models for real-time tracking" ...
3
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1answer
746 views

How to evaluate a background subtraction algorithm given ground truths?

I'm testing a background subtraction algorithm with sample image sequences. I am wondering how one can evaluate the accuracy of a background subtraction algorithm results given ground truths? The ...
1
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1answer
888 views

Background subtraction for object tracking

i am working on object tracking. i want to use background subtraction. i have tried to find out papers on background subtraction but i am really confused to use which one. I have already done tracking ...
3
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0answers
151 views

Detecting blades of a wind turbine

I have many close-range images of a single wind turbine blade (taken from different positions, same angle): I need to separate the blade image from background like this: The problem arises in image ...
0
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1answer
724 views

Inverse of Wavelet Transforms - Background and Noise Removal

Main Problem: How can you inverse Wavelet Transforms (Using the data given by signal.scipy.cwt) I was wondering if anyone understands the ...
1
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2answers
8k views

Remove background from image

I want to remove the background from image. Let's say I have this background: . Then I put pen drive and tippex on it. . Is it possible to remove the background image from second image? If so, ...
3
votes
2answers
5k views

Uneven background subtraction: Rolling ball vs Disk tophat

A classical technique in still images (e.g. fluorescence microscopy images) to remove uneven illumination and isolate bright blobs is to use morphological operation such as the top-hat transform. For ...
3
votes
3answers
589 views

segmenting region of interest (ROI) from background

I am dealing with images from biological slides and want to segment out the ROI (cells) from the background. I have tried k-means clustering, otsu thresholding, adaptive thresholding, edge detection ...
6
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3answers
4k views

“Subtracting” one audio stream from another audio stream

I am a long time software engineer but have practically zero experience with signal/audio processing. I am interested in learning about signal processing via a use-case we have for one of our audio ...
7
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2answers
1k views

What is the state-of-the-art method for dealing with illumination issues in background subtraction?

I have been struggling to find a well-cited approach to this. Essentially, I am experimenting with different background subtraction algorithms, but none seem to perform well when there are ...
14
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2answers
10k views

How to extract vocal part from stereo audio signal?

I'm now processing MP3 file and encounter this problem. My MP3 is stereo encoded. What I want to do is extract vocal part for further processing(whatever mode of output signals, mono or stereo are ...
17
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5answers
3k views

How can I compare two pictures from the camera and tell if there are enough differences to detect movement?

I want to use my phone as a CCTV system to control a room in my house, and display an alert when something is moving. For now, what I have succeeded in doing is to grab a picture every minute and ...