All Questions
14 questions with no upvoted or accepted answers
3
votes
1
answer
588
views
Estimate Image power spectrum of the noise
I want to implement Wiener filter. I have original image and image blurred with linear motion. The one thing I am lack of(to implement it) is Noise power spectrum.
I know that it is hard task. I've ...
3
votes
0
answers
1k
views
Why PSNR decreases for Ultrasound Images?
I am working different types of filters to remove speckle noise in ultrasound image. I have taken the below paper as my base paper and trying to reproduce the results of this paper:
My Base Paper
I ...
- 1,021
2
votes
1
answer
120
views
Thresholding Algorithm for Separating Skin from Clothes
I have an several images that look like the following:
I would like to separate the skin from the trousers here without specifically training a segmentation model. Can anyone suggest any such ...
2
votes
1
answer
1k
views
Finding circle in binary image (R, not matlab)
How would I extract the circular area of a binary image which looks like:
The two rods emerging from the side of the circle are noise.
I know of the hough transform in Matlab. However, I am using R ...
- 163
1
vote
0
answers
210
views
Randomly Generate Synthetic Noise in an Image Text Document
I'm working on denoising dirty image document. I want to create a dataset wherein synthetic noise will be added to simulate real-world, messy artifacts. Simulated dirt may include coffee stains, faded ...
- 127
1
vote
0
answers
398
views
Calculating the Mean Square Error (MSE) in Wavelet Denoising
I´m currently reading the paper (to be more precise: it´s a chapter from the book "Shearlets, Multiscale Analysis of Multivariate Data" by Kutyniok and Labate) "Image Processing Using Shearlets" by G....
- 11
1
vote
0
answers
244
views
Detection of interesting structure in images?
I'm looking for methods of computing some measure of structure in an image. (I do not have a rigorous definition of "structure" though........) Consider the 15 image blocks below:
Suppose for each ...
- 121
1
vote
0
answers
160
views
Local signal-to-noise ratio for an image
I want to do one of these common experiments to see the effect of increased noise on the performance of a feature detector.
To do this add zero mean gaussian noise with fixed sigma to the image and ...
- 3,636
0
votes
0
answers
49
views
removing stripy artifact from fMRI
I have fMRI images, some of which have a stripy artifact that looks like a Gabor filter. Removing this kind of noise is not, to my knowledge, a standard part of any fMRI processing pipeline. I am ...
- 101
0
votes
0
answers
84
views
standard deviation of two constant noised signals related through interpolation
Let us say say we have a noised constant signal and want to evaluate the standard deviation (std) of the noise. We calculate the std of the said noised signal and call it $\sigma_1$. Now we process ...
- 9
0
votes
0
answers
228
views
How can I add any kind of noise to image for a given SNR?
What is the best way to add any kind of noise (not only Gaussian noise) to 2D signal (image) for a given SNR?
- 27
0
votes
0
answers
45
views
Dirty Image Quality Assesment Measure
I was looking for a way to measure how dirty is the document in image processing. Example images below:
a. Dirty Backgrounds
b. Dirty Backgrounds with Text
Can someone give me an initial idea to ...
- 127
0
votes
0
answers
347
views
Determine Gaussian distribution parameters from the signal-to-noise ratio
Is there a straightforward formula for determining the mean and standard deviation of the gaussian distribution followed by noise applied on an image, knowing the signal-to-noise ratio between the ...
- 121
0
votes
0
answers
62
views
How to detect malformed-ellipse-alike objects?
I need to process a stack of ultrasonic images, where there is mostly a lot of noise to see, but I need to extract specific objects that look for example like this:
Here is an example from Wikipedia ...
- 101