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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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android - voice enhancement / noise cancellation / noise reduction library for android

I am developing an app which have a speech recognition feature using android built in SpeechRecognizer and RecognizerIntent. Is there any noise reduction or noise cancellation library for android that can integrate to my app to improve the accuracy…
intac system solutions
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Adaptive bilateral filter in opencv python2.7 implimentation

I want to use adaptive bilateral filter in python using opencv. But I am not able to understand how to put the parameters or what should be the values. This is what I found in OpenCV 2.4 documentation. cv2.adaptiveBilateralFilter(src, ksize,…
Amey Chindarkar
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2-Microphone Android Phones for ASR purposes?

Is the Nexus One the only Android phone having 2 microphones? I know that the 2nd microphone is intended for helping noise cancellation and I need this feature for my software development project. I am wondering whether the Nexus One is the only…
Android Eve
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How to remove/reduce noise from .wav audio file in python

I have a .wav audio file, I'm working on converting the audio to text. I need to reduce/remove noise to get more accurate result. Please let me know how to go about it import wave import sys import binascii ip =…
Anagha
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Line detection in noisy image (and no detection when it is not present)

I have tried to extract the dark line inside very noisy images without success. Some tips? My current steps for the first example: 1) Clahe: with clip_limit = 10 and grid_size = (8,8) 2) Box Filter: with size = (5,5) 3) Inverted Image: 255 -…
Rômulo Cerqueira
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Remove noise from characters in an image

I processed my input image and the result is below. I just need the characters. I tried but can't remove the noise surrounding the characters.
Eifa Tasnim
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Suggestions on how to approach averaging of objects detected

Background I am currently trying to build an autonomous drone using ROS on my Rapsberry Pi which is running an Ubuntu MATE 16.04 LTS. Solving the Computer Vision problem of recognising red circles as of now. Since by nature, the drone is not stable…
SDG
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Noise Filtering in 3D Kinect Image

I want to perform Noise filtering on a image taken by Kinect2 in Matlab R2015b. I have a cardboard with objects drawn on it. Now when I picture it with Kinect some points(Noise) appear in picture which were not present in real 2D cardboard line. I…
BASEER ULHASSAN
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How to decrease background noise in binary image

Here is an example of binary images, i.e. as input we have an imageByteArray with 2 possible values: 0 and 255. Example1: Example2: The image contains some document edge on a background. The task is to remove, decrease amount of background pixels…
Viacheslav Fateev
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Active Noise Cancellation - feasibility

I'm planning a micro-controller project on active noise cancellation. The idea is: Speaker_1 generates 100-200 Hz noise (constant frequency). Microphone records Speaker_1. Signal is passed into micro-controller for DSP. Output from…
Splaty
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How To Record Sound in Android with Better Quality and Reduce Noise

I’m trying to build a music analytics app for android platform. the app is using MediaRecorder.AudioSource.MIC to record the music form the MIC and them encode it PCM 16BIT with 11025 freq, but the recorded audio sample are very low quality is…
Hamed mayahian
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Stein Unbiased Estimate of Risk (Sure) to denoise signals

I wish to use Stein Unbiased Estimate of Risk (Sure) for denoising signals. I have a 1-Dimensional signal. I am using wavelets to decompose the signal into multiple levels of approximate and detail coefficients. For denoising the original signal,…
Soumya
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How to detect edges in a image, and create a mask (matlab)

I am trying to do a task, but there are 2 problems. The first one, I must take an image, and then detect the edges on the surface. This is the original image: and this would be the result: However, I got this: I am using a very simple…
Dedrawde
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Any audio noise reduction technique for android?

I am very new to android development. I am developing an app which does voice recording.In that I would like to remove the noise in the recorded audio.I know there are in-built options but would like to try any custom noise reduction algorithm or…
Saran
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Detecting Many Small Circles in Close Proximity with cv::HoughCircles()

I am trying to detect a large number of small circles that are in relatively close proximity to one another (only about 20 pixels apart) using OpenCV. I have managed to create this mask using cv::inRange() and cv::Canny(). Original…
Kevin Gurney
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