Questions tagged [background-subtraction]
The background-subtraction tag has no usage guidance.
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Removing the background of a postcard scan
I'm trying to build a tool to automatically create a "background mask" of a scan of a postcard, allowing pixel information not relating to the postcard itself (ie. the ceiling of the scanner)...
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How can a common trends be detected and filtered from multiple spectra data?
I'm looking at spectral data collected through Cavity ring-down spectroscopy. I'm comparing a few samples of similar analytes and expect slightly different peak heights and trends. However, there are ...
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Numerical Integration Drift
I have collected force platform data to which I calculate acceleration and velocity. The velocity data is presenting what I understand as drift from the numerical integration process that I undertook ...
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Foreground extraction with zebra background
I am trying to classifiy grayscale images but I need to focus on a specific object on each image.
I would like to segment the object but the targeted object has the same color than the background.
And ...
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How to Calculate Local Spatial Variance of an Image?
For those who work often on image processing, I'm facing an algorithm of Non-Uniformity Correction (NUC) that requires the calculation of a parameter called "Local Spatial Variance". I can't ...
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Continuum Fitting with Python using specutils
it's my first time processing spectra from a black body radiation experiment, I'm using Python and having some troubles...
I have this spectra with 2 peaks and uneven background noise which I want to ...
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Subtract background from 2D signal using spectral methods
I have a 2D signal, with intensity as a function of two angles (alpha and beta), as shown below.
This contains a background, which makes the signal's base-surface locally convex-concave. I would like ...
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Removing vocal but retaining all background ambient noises
I have one audio file containing human speeches, a lot of ambient noises like audience laughter, birds chirping, sounds of natures etc..
Now I want to separate it into two audio files where one ...
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Help with automated baseline removal
This is more of a conceptual question, so apologies in advance if this is not the correct forum for such questions.
I am trying to find a repeatable and consistent method for removing the baseline of ...
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362
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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 ...
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599
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 $ω_{i,t}$ ...
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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 ...
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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" ...
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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 ...
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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 ...
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172
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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 ...
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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 ...
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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.
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Is it possible to remove the background image from second image? If so, ...
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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 ...
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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 ...
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“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 ...
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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 ...
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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 ...
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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 ...
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