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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.

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C algorithm for Matlab code wden (wavelet denoising)

Can anyone give me the source code in C for the following Matlab wavelet denoising method, I have to implement it on an ARM board so Matlab library wont work. xd1 = wden(x,'sqtwolog','s','mln',5,'db5'); Where xd1 is the denoised signal and x is my…
user11622
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How can I plot a spectrogram of wav file and plot graph before and after noise reduction input from Microphone

My project Noise reduction. 1.Here my code input from microphone and save to .wav Read in the file clear all; close all; mic1= dsp.AudioRecorder; hmfw = dsp.AudioFileWriter('myspeech.wav','FileFormat','WAV'); disp('Speak into microphone…
KKI
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Imagemagick, clear noise from QR-code image

I have QR-code scanned from document, when I trying do decode it with online decoder, like http://zxing.org/w/decode.jspx or other, they not find QR-code, but when I decode with camera on smartphone, it's decode correct text. I think it's because…
Ashot Khanamiryan
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iOS Remove Particular Sound from a video

I have an application which plays some audio and also records a video+audio while that sound is playing. I would like to figure out a way to process the video so that the audio that was picked up by the microphone is removed from the resulting…
Liron
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how can i removing sinusoidal noise w\ frequency domain in opencv

i'm trying to remove '5 lines' in section, in music papers, my original image is this : http://en.wikipedia.org/wiki/Requiem_(Mozart)#/media/File:K626_Requiem_Mozart.jpg First, i apply gaussian filter and binarized with threshold (min:100, max…
DY Jun
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How to Reduce Noise in Sphinx4 application

I am new to sphinx4 and speech recognition thing. I am creating a speech application by using sphinx4. The issue is noise, which results in recognition by program even without speech input by user ie it is converting speech to text even when there…
MANU
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Designing bandstop filter for positive and negative frequencies with MATLAB

I have two WAV files of the same sound recording, but one contains background noise and the other does not. I am trying to use a bandstop filter to filter the one that contains background noise. I have found the fft of both signals and graphed them.…
lcq
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Removing noise from an image but I could not store words in the image, MATLAB

I need to clear noises from my image, The input image is : To do that, I've applied some filter operations and after all, I've got the following image : However, as you see, the words (LIBERTE,EGALITE,FRATERNITE)were gone after the operations that…
mat lab
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how to use weave to exeute c-code image denoising algorithm?

I have a denoising-algorithm written in C, and I need to use weave.inline to execute the code in order to remove noise from an image. The algorithm doesn't work properly. It says that Weave working on 1D-array, so that's why I have to convert a 2D…
zeiar2
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how to activate noise cancellation in sphinx4?

There is a denoise.java file in sphinx4/src/sphinx4/edu/cmu/sphinx/frontend/denoise This file is not included in the frontend. So how should i activate this denoise.java so that noise cancellation gets activated in sphinx4.
soumya yelamali
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What should be the input and output for an FFT image transformation?

I try to obtain the spectrum of an grayscale image using FFT Cooley–Tukey algorithm in Java. I don't know exactly how to form the input for the algorithm and what values from the output to use in order to form the spectrum image. Currently my input…
mawus
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Bluetooth Headset picking up noise - how to activate noise suppressor like NoiseAssassin

I'm recording my voice through a Bluetooth headset (ERA JAWBONE) and playing it in realtime on the phone speaker. This works with the following code: buffer = new byte[buffersize]; android.os.Process.setThreadPriority( …
Diego
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How to design and implement an adaptive filter for impulse noise removal?

I should design and implement an adaptive filter to remove impulse noise from medical images! and i am new in image processing . and don't know how to design a filter! I have checked the predefined filters... they are not what i want! please help…
Shahriar.M
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Identifier not found with a function in Opencv, how to solve this?

I'm trying to use this function: fastNlMeansDenoising(image, image, 3.0, 7, 21); Using OpenCV with Visual Studio 2010 express, but it said "identifier not found". I did a quick search and found that this must be a ".lib" is missing, but I did not…
U23r
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Which filter can best remove horizontal vertical banding noises (hvbn) from image

I would like to know if among the OpenCV filter functions, is there a particular one that is suited to remove horizontal/vertical banding noise in an image? Like, for salt and pepper noise, Gaussian blur works best. Or, is the process of removing…
user3339658
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