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Questions tagged [noise-reduction]

Anything related to noise reduction techniques and tools. This tag may be employed for questions on algorithms (and corresponding implementations) used to reduce noise in digital data and signals.

Anything related to noise reduction techniques and tools. This tag may be employed for questions on algorithms (and corresponding implementations) used to reduce noise in digital data and signals.

298 questions
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MATLAB image processing missing areas

I have 3 versions of an image, one = it has 5 areas missing (large white pixelated area), two = it has lots of noise and distortion, three = the ground truth image, the original. I have started to remove the noise and distortian from image two to…
RHH
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Find and replace subarray in python array

I have a 6600X5100 numpy array which represents a black & white image. I want to clear this image from black pixels noise- remove all black pixle lines (vertically and horizontally) that are shorter than 2 pixels. So if I have something like…
Phoenix
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How can I remove white lines which is larger then Threshold value in binary image ? (matlab)

I have a binary image which I want to remove white lines larger then Threshold value (like 50 pixel). original image: input and output image : My idea: I want to count white pixels which located in each rows and if (( number of white pixel >…
Karo Amini
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How to get rid of noise in a signal?

I have been trying to figure out this problem all week. My main problem is seperating the sound from the noise in the signal (see plotted example: In between these small noises are dtmf tones. Once I get the index of the starting and ending points…
Cj Mac
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Why does the inverse of a sound wave sound exactly like the original?

I have an audio source (I am working on a project with another member in SO who has also been asking questions) IN time domain, we have 44100 samples of signed 4 byte integers. In time domain we negate each sample. In frequency domain, as another…
steve landiss
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Canceling noise given a LPCM array of 44 samples per second

I have an array of 44100 samples per second of LPCM data. Actually I have two channels worth of data. Every 11.61 milliseconds I get around 512 samples. Now I want to follow the directions on How to cancel noise from audio However, that explanation…
user605957
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ParameterError when performing Audio noise reduction

I have a project to create a noise reduction app in Python. I've searched many ways to solve this problem, but each example I've tried doesn't work, there are always some exceptions thrown. I've tried this import noisereduce as nr from scipy.io…
Nikita
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How to get barcode from image?

I need to get the information in the below barcode with the Python pyzbar library, but it does not recognize it. Should I make any improvement before using pyzbar? this is the code: from pyzbar.pyzbar import decode import cv2 def…
Andres Marin
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findchangepts does not dectect some changes

I am writing code that takes a signal from an accelerometer and I use the TVD algorithm in order to denoise the signal. As we can see in the following graph I managed to do that: But I want to detect the peaks, and I think that I could use the…
Miguel Sanz Narrillos
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How do I remove noise from this audio file?

I am uploading an audacity project with 2 tracks, the 1st one contains a "bitbit" sound resulted from Speex echo cancellation. I tried to remove the sound using Audacity noise cancellation, didn't work. Tried equalizer to cut off some high frequency…
Nayeem1
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How to prevent oversmoothing while applying fft to raw signal

I am trying to do fft for removing noise from the signal. While doing that I am getting frequency domain like thisfreq_domain: So when applying butter pass filter to the peak freq of the signal is over smoothing like this original image: image…
Yuvaraj Yuvi
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How to draw a black border around the image

How can I crop the image such that it will only contain the leaf and not have the noise part?
Kumar Arindam Singh
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Noise reduction in Matlab arrays

I used median filtering in Matlab to reduce noise in arrays. I was calculating the velocity and acceleration of an object. The velocity part worked fine, and the result I got was exactly what I expected. I stumbled in to problems regarding the…
user1067252
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