Stack Overflow
Stack Overflow

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
5
votes
1 answer

Dealing with noisy training labels in text classification using deep learning

I have a dataset that comprises of sentences and corresponding multi-labels (e.g. a sentence can belong to multiple labels). Using a combination of Convolutional Neural Networks and Recurrent Neural Nets on language models (Word2Vec) I'm able to…
JoelKuiper
  • 4,362
  • 2
  • 22
  • 33
5
votes
1 answer

How to find contours only in black colour?

I try to remove noises from an image. I have some black group of pixels in the image. I use cv::findContours and cv::boundingRect. And I fill small rectangles (small rectangles are noises in the image) with white colour. But this method also find…
peter55555
  • 1,413
  • 1
  • 19
  • 36
5
votes
1 answer

How to plot average of noise values in Gnuplot

Is it possible to filter the noise in Gnuplot and get a plot with average values of different sets? The plot can be seen below.
Physther
  • 246
  • 3
  • 10
5
votes
1 answer

Convert raster images to vector graphics using OpenCV?

I'm looking for a possibility to convert raster images to vector data using OpenCV. There I found a function cv::findContours() which seems to be a bit primitive (more probably I did not understand it fully): It seems to use b/w images only (no…
Elmi
  • 5,899
  • 15
  • 72
  • 143
5
votes
1 answer

Removal of noisy pixels using opencv

I am trying to detect text from an input image using openCV. For that I need to remove the noise components from the image. The criteria for that which am using is that if the pixel count of certain component is less than 15 am eliminating that…
Koustav
  • 733
  • 1
  • 6
  • 21
4
votes
2 answers

How to create Anti-noise?

How can I create anti-noise with code or an application? It doesn't have to be realtime, just sound that is the opposite of the entire soundtrack! So, when you play both together, they will cancel out each other.
user1095332
  • 403
  • 6
  • 17
4
votes
1 answer

Feature Detection in Noisy Images

I've built an imaging system with a webcam and feature matching such that as I move the camera around; I can track the camera's motion. I am doing something similar to here, except with the webcam frames as the input. It works really well for "good"…
Jason
  • 13,563
  • 15
  • 74
  • 125
4
votes
3 answers

Noise Removal in Opencv

I'm currently working in a project where noise removal in document image is required. But i cant create any useful code to start my project. thanks. According to what I've studied, noise (specifically salt/pepper noise) that produce in faulty…
kcire arraveug
  • 213
  • 1
  • 6
  • 13
4
votes
3 answers

Measure distance between images

Regarding my question about Gaussian noise reduction, I would like to know of a simple method to quantify the success of a noise reduction filter. I've attempted a few methods of noise reduction and I want some method to determine which one works…
shwartz
  • 631
  • 3
  • 13
  • 29
4
votes
2 answers

What is a mathematical relation of diameter and sigma arguments in bilateral filter function?

While learning an image denoising technique based on bilateral filter, I encountered this tutorial which provides with full lists of arguments used to run OpenCV's bilateralFilter function. What I see, it's slightly confusing, because there is no…
mission_code_now
  • 89
  • 4
4
votes
1 answer

How to generate proper pink noise and filtering by a custom peak filter in Python

I'm dealing with the problem of filtering a pink noise with a peak filter (the final goal is to equalize an input signal). I've been designing the peak filter myself to get more familiar with 1D signal filtering. As for the pink noise, I'm using…
Post. T.
  • 79
  • 5
4
votes
1 answer

How to use python OpenCV to find largest connected component in a single channel image that matches a specific value?

So I have a single channel image that is mostly 0s (background), and some values for foreground pixels like 20, 21, 22. The nonzero foreground pixels are mostly clustered together with other foreground pixels with the same value. However, there is…
Terry Martin
  • 529
  • 8
  • 20
4
votes
0 answers

How to disable system audio enhancements using webRTC?

On different systems (Windows/Android/etc.) there are some "built-in" audio enhancements. For example AEC (autmatic echo cancellation), NR (noise reduction) and Automatic Gain Control. Everyone can have those turned off or on in any…
dankal444
  • 3,172
  • 1
  • 23
  • 35
4
votes
1 answer

Android SIP audio call : How disable noise suppression?

I have implemented native Android SIP solution in my Android app. SipProfile.Builder builder = new SipProfile.Builder("username", "host"); builder.setPassword("password"); SipProfile me = builder.build(); //open Intent intent = new…
fingerup
  • 4,828
  • 2
  • 16
  • 22
4
votes
2 answers

Noise reduction and compression in streaming audio

hope you can help. I am recording audio from a microphone and streaming it live across a network. The quality of the samples is 11025hz, 8 bit, mono. Although there is a small delay (1 second), it works great. What I need help with is I am trying…
Rodney Burton
  • 427
  • 8
  • 18
1
2
3
…
19 20