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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 remove salt and pepper noise from images using python?

I have tried to implement the following algorithm but the resulting image looks the same. Step 1: Read Noisy Image. Step 2: Select 2D window of size 3x3 with centre element as processing pixel. Assume that the pixel being processed is…
user3395151
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How to remove noise of an image using a mask

The other day I asked about something similiar and finally i solved that part, but i am stuck again. I would like to create a noise filter, to remove noise from an image, avoiding edges and boundaries. My imput is an image file, and the filter is a…
Dedrawde
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Removing background from image (MATLAB, Java, or Python preferred)

What I would like to do is take an image of several plants and remove the background lines and noise from the image. The end result will then hopefully be able to be turned into a binary image where every 1 value is just part of the plant. Is there…
Sam
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Library for noise reduction?

I am currently doing a project capturing audio stream from microphone. The stream I captured was full of background noise. I am wondering if there is library provided for removing the noise. If not, what kinds of algorithm I should look for?
Adam Aiken
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Distortion in Image Morphing using OpenCV

I am creating an iPhone application for image morphing using OpenCV 2.4.3. I am able to do the morphing but some noise/distortion is also getting introduced. I am not able to identify where the source of this noise or how to remove it. Please help…
iPhoneCoder
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Filter Noise in MatLab

Hi I'm attempting to filter an image with 4 objects inside using MatLab. My first image had a black background with white objects so it was clear to me to filter each image out by finding these large white sections using BW Label and separating them…
user1701856
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Close images have maximum difference. Why?

I'm making a toy code to detect and fix scanline glitches on images. I pick Lenna image from Wikipedia, and add horizontal scanline glitches, by multiplying the rows with random values between 0.9 and 1.1 To identify the horizontal scanline glitch,…
Colim
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How to detect this kind of artifacts/noises in my image?

I've been processing some image frames in videos and I discovered that sometimes one or two frames of the video will have artifacts or noise like the images below: The artifacts look like abrasions of paint with noisy colors that covers only a…
吴正良
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Algorithm for periodic noise removal in images using band reject filters (notch)

This question can be considered a theoretical follow-up to this question. Mainly, I have this noisy image: Original Image Goal Filter out the periodic noise of the image using band reject filters. Frequency spectrum (shifted + zoomed in) I first…
Joseph Saliba
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noisereduce algorithm in python not working

I've been trying to use noisereduce pypi algorithm to reduce noise for an audio file but it is giving me an error : Traceback (most recent call last): File "C:/Users/Seif Koretum/Desktop/noise_reduce/main.py", line 22, in …
Seif Koretum
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Detect textured background for contrasted images

I have two types of images, and they were both contrasted. Type 1: (white and clean background) Type 2: (some gray texture in background) I could apply Gaussian blur and Thresholding to process the type 2 image to adjust it to the white background…
NguyenHai
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FFmpeg Option 'mix' not found while using arnndn filter

I am attempting to use FFmpegs arnndn filter (https://ffmpeg.org/ffmpeg-filters.html#arnndn) to denoise audio samples. I am able to run this command ffmpeg.exe -i "input.mov" -af arnndn=m="bd.rnnn" "output.mov" and I receive a denoised output,…
AnnaJoyW
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Comparing denoising algorithms performances using PSNR when there is no clean image (Ground Truth)

I have medical images containing speckle noises, and one of my tasks is to denoise these images. I tried 8 algorithms and inspected the denoised images visually. I want to use PSNR to quantify the process. Based on the PSNR definition, it is…
Amin
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Numpy 3D array max and min value

I have Numpy 3d array that is just a list of gray images: images = np.zeros((xlen, height, width), dtype=int) for i in range (5): images[i] = cv2.imread(filename[i], cv2.IMREAD_GRAYSCALE) All the images are pretty the same but they all have some…
Cepera
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I am now working on an algorithm to recover data and the situation doesn't allow neural networks

The following code shows the problem I am facing: ''' def fakeDataGenerator(chanNum=31): #This function generates the data I want to recover and it shows the characters of the data I am working on. It's continuous and differentiable. peaks =…
Irrawa
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