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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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How to use RealSense's spatial_filter on an OpenCV Mat?

I want to apply RealSense library's depth filtering (rs2::spatial_filter) on an OpenCV Mat, but it seems like the filter is not being applied. The original depth image and the supposedly filtered depth image look exactly the same. To load raw depth…
Stan
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Kalman filter in python 2-D

As shown in this picture, my predicted points are following the GPS track, which has noisy points and that is not desired. Instead I want my filter to predict points that follow the road instead of the green area. I tried to implement Kalman filter…
Naveed Zafar
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Select right kernel size for median blur to reduce noise

I am new to image processing. We have a requirement to get circle centers with sub pixel accuracy from an image. I have used median blurring to reduce the noise. A portion of the image is shown below. The steps I followed for getting circle…
Maanu
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What is the best measurement for validating a denoising function in Image processing? Signal to Noise ratio seems to fail me

I'm using BrainWeb a simulated dataset for normal brain MR images. I want to validate MyDenoise function which calls denoise_nl_means of skimage.restoration package. To do so, I downloaded two sets of images from BrainWeb, a original image with 0%…
mirzanahal
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Java - Mixing audio files generates unwanted white noise

Recently, I've been experimenting with mixing AudioInputStreams together. After reading this post, or more importantly Jason Olson's answer, I came up with this code: private static AudioInputStream mixAudio(ArrayList audio) throws IOException{ …
Pojo226
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Please explain why we use 32768 in Audio Signals

I'm new to audio signals. What is the value 32768 that we use here? Sample code: rate, data = wavfile.read(wav_loc) data = data / 32768
user12297740
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1 answer

How to filter white bits in a monochrome image that exceed a specified area?

I have this fancy image of "Brainbow image showing map of neuronal circuits of the mouse cerebral cortex" and I want to count the number of green flashes so ran k-means on it with 15 clusters and I isolated the two colors that together do the job,…
praneeth mendu
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How do i remove big-grain-noise from an image?

This can be generalized to: How do I remove regions that look similar to another region from an image? The big Image is in grayscale. I have a lot of sand in it and I need to detect features. The Sand particles are multiple pixels big. I know where…
GRASBOCK
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Remove noise from mp3 file, MATLAB

I have a mp3 file in the link below, where there is a man human voice and some humming noise in the background. I want the humming noise removed. Is there anyone who can tell me how to do it in…
mearry_1713
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How to remove noise from image in python

I'm trying to remove noise from image, i'm trying to make white pixel if certain condition met but i'm struggling to make that happen. This is my image and i want to remove all gray color lines only want high intensity color like blue red and…
Abhijeet Gulve
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Singular Value Decomposition simple code in c

I am looking for Singular Value Decomposition (SVD) code in C, would you please help me? I found many sources but I cannot run them, I am looking for a version of SVD code that provide all 3 matrix of S, V and U for me.
Amir
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Noise Removing from Image with circular objects

What would be a good method to remove this type of noise from an image?
asadmujtaba
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How to remove noise from a set of data points assuming the data is normal but the noise is uniform?

I have a load of points inside some bounded rectangle of the plane. Most of them follow one of n bivariate normal distributions (the number n is unknown) but a pretty small amount of the remaining points instead follow one uniform distribution…
Jay
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How do I calculate the average value of a pixel's surrounding pixels?

I am trying to create a 5x5 mean filter to remove some salt and pepper noise from an image. I read the image into a numpy array. And tried making some changes to calculate the average value of a pixel's neighbors. The result I got is quite bad and I…
Dikshant Adhikari
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Is there a way of removing pixels in an image that have less than two neighbors using opencv?

After performing a bunch of preprocessing steps, I have this image. I'd like to remove the tiny islands of noise from within the image. What I've noticed is that these noisy pixels are directly connected to less than two pixels in their…
user8773963
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