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.

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Filters for noise reduction (Image Processing in Matlab)

This code simply estimates the boundaries of objects in an image for further processing f = imread(ImageFile); i = rgb2gray(f); threshold = graythresh(i); bw = im2bw(i, threshold); imshow(bw) se = strel('disk',3); bw = imclose(bw,se); bw =…
user2208454
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How to remove the noise from a wav file with a IIR Eliptical filter

I have to remove the noise from a wav music file with matlab. I know that I have to use the ellipord and ellip functions. First I read the wav file:[x,Fs]=wavread('file.wav'); Then I do a spectrogram: spectrogram(x,512,400,512,Fs,'yaxis'); Now, I…
Fabio Cardoso
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Real-time audio denoise using FFT on android

I'm thinking of starting a android project, which records audio signals and does some processing to denoise. My quesion is, as many (nearly all) denoising algorithms involve FFT, is it possible for me to do a real-time program? By real-time I mean…
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Do i need noise reduction algorithms while developing language model for my local language

I am developing an acoustic model and an language model for my local language and I have planned to integrate it with pocketsphinx and sphinx4. Now I want to ask do i need to implement an noise reduction algorithm for transmission accuracy for my…
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How to deal with noise in images captured with a camera

Assume there is a black box there is no light in it and there is a camera in this box. Camera starts capturing and what it captures is nothing - everywhere is pure black in box. But there will be differences in the sizes of captured frames due to…
y33t
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how_remove_noise

I would like to know how noise can be removed from data (say, radio data that is an array of rows and columns with each data point representing intensity of the radiation in the given frequency and time).The array can contain radio bursts. But many…
naran
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noise reduction

I have an image with uniform intensity everywhere with gray value = 100 then i added additive zero-mean independent Gaussian noise with standard deviation = 5 I = ones(100,100)*100; I_n=I+(5*randn(100,100)); I think that the mean and standard…
HforHisham
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By reversing the polarity of a time domain signal, can I cancel the source audio?

I have an input signal in time domain (that is, discrete 14100 signed integers per second). If I reverse the polarity (signed-ness) of each value, will I not produce a destructive source-audio canceling signal?
user605957
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How to perform despeckle operation without using JAI,ImageJ,jhlab libraries?

I am making an app in Netbeans using Java Swing. I want to achieve some image processing functionality (like in ImageJ) in my app without using the ImageJ, JAI and jhlab libraries. For example: ImageJ>>Process>>Noise>>Despeckle. So, how can I do…
Jay
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creating noisy image(random noise)

Just as we can make a noisy image with imnoise :imnoise (A, 'salt & pepper', [density]). How to add random noise with a particular density?
sujaya
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Timeseries denoising and downsampling

What are some different denoising techniques for time series? What conditions have to be in place to downsample a time series without loss of information?
user11715878
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Address and smoothen noise in sensor data

I have sensors data as below wherein under Data Column, there are 6rows containing value 45 in between preceding and following rows containing value 50. The requirement is to clean this data and impute with 50 (prev value) in the new_data column.…
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How can I fix the attribute error: module 'noisereduce' has no attribute 'reduce_noise'

I have run the code below and it keeps on giving me the attribute error; import noisereduce as nr from scipy.io import wavfile from noisereduce import reduce_n # load data rate, data = wavfile.read("output.wav") # select section of data that is…
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Removing 'noise' or 'holes' from image

So I have a grey-scale image (2D matrix with cell values ranging from 0.0 to 1.0). I am manipulating it using python. I would expect it to have gradual changes of values, but it comes with some clearly undesired 'artifacts', as the one marked in red…
adlzanchetta
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Any recommended de-noise algorithm?

I'm trying to get rid of noise in the grayscale image. I tried the non-local-mean and Gaussian filter, but none of them give me good results. Is there any recommended algorithm I can use?
Alice
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