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Efstathios Kontolatis


Active since 2016

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Continuous wavelet transform using derivative of Gaussian(DOG) wavelet
I am trying to do continuous wavelet transform using a derivative of Gaussian order two wavelet. I want to obtain the frequencie...

7 years ago | 1 answer | 0

1

answer

Question


Zero mean values but still dominant frequency is zero
Hello, I have a series of numbers and I try to find the dominant frequency using FFT. I know that for the FFT to work properl...

7 years ago | 1 answer | 0

1

answer

Question


How to perform fft
I have 1000 samples from an experiment with frequency Fs=67890 Hz. How can I perform fft on them? I followed the guide here <htt...

7 years ago | 2 answers | 0

2

answers

Question


How to extract a vector from an image?
Hello, I have this image <</matlabcentral/answers/uploaded_files/70446/1.png>> and I want to extract only the velocity...

8 years ago | 3 answers | 0

3

answers

Question


How can I change the tick labels in a colorbar
I have some images that contain probability data. Thus, the colorbar is [0 1]. However, when I plot them I want the colorbar tic...

8 years ago | 1 answer | 0

1

answer

Question


How to find arrays in a cell array
Hi guys, I have a cell array(let's say c) consisting of 2D arrays and I want to find all the arrays that(say a is an array) h...

8 years ago | 2 answers | 0

2

answers

Question


Edge detection only in a region of an image
I have an image and I want to make edge detection only on a region of this. In order to do so I have created a complex polygon u...

8 years ago | 1 answer | 0

1

answer

Question


How to find the pixels of certain regions in a binary image
I have created a binary image which contains the edges of an image. I want to keep only the pixels of the regions that have an a...

8 years ago | 2 answers | 0

2

answers

Question


Problem with Matlab sliding neighborhoods
I have an image. I want to create a sliding window of changing size and want to make some calculations depending on some criteri...

8 years ago | 1 answer | 0

1

answer

Question


Which is the best method for edge detection in this image
I have the following image but the methods that exist in MATLAB (Sobel,Canny etc) don't give something acceptable. Does anyone h...

8 years ago | 1 answer | 0

1

answer

Question


I have two images. The first one is produced from the second one but I have to find how.
I have two images. The first one is produced from the second one and I have to find how this happens. Is there a way in MATLAB t...

8 years ago | 2 answers | 0

2

answers

Question


how can i show two images with different range with imagesc
I have two uint16 images with different range, let's say the one has a range from 0 to 1800 and the other from 0 to 2500. In ord...

8 years ago | 0 answers | 0

0

answers

Question


Neighbors of a pixel
I want to calculate the mean of the neighbors of the pixels in an image. I want to do it for all pixels not only the internal on...

8 years ago | 4 answers | 0

4

answers

Question


Problem with the im2uint16
I need to create a series of mean images. So I created the following code function [meanbgimage] = impostprocbg(bgpath) ...

8 years ago | 1 answer | 0

1

answer

Question


Apply mean and standard deviation of an image to another image
Hi I have an image and I calculate the mean and standard deviation like this meanint=mean(mean(tmpimg)); stdint=std(st...

8 years ago | 2 answers | 0

2

answers

Question


Brightness of two images
I have two images. The one which is correct is brighter at the center of the image and darker at the limits. The other one is th...

8 years ago | 2 answers | 0

2

answers

Question


Find a pair of elements in a 3d matrix
I have a 512*512*2 matrix. If A is the matrix then I want to find the pair of elements A(:,:,1) and A(:,:,2) that are equal to a...

8 years ago | 2 answers | 0

2

answers

Question


Mean of neighbor pixel
Hi guys, I try to calculate the average intensity value of the neighbors of a pixel(either 8 or not). I am confused with the ...

8 years ago | 2 answers | 0

2

answers

Question


Mean of 10000 images
I have a group of 10000 uint16 tiff images. Which is the best way to create the mean image of them as a uint16 tiff. If I keep t...

8 years ago | 2 answers | 0

2

answers

Question


Problem with saveas imshow and imwrite
Hi all, I have a problem trying to save my images. I have a 512x512 tif figure. When I use this code(Image is my 512x512 uint...

8 years ago | 1 answer | 0

1

answer

Question


problem with size of images
I have the following code imglist=dir('*.tif'); %list of the .tif images thresh = zeros(512,512,200); level = zeros(200...

8 years ago | 1 answer | 0

1

answer

Question


problem with sorting a structure
I have a structure created by the dir command so I have something like that images=dir('file*.tif') The problem is that ...

8 years ago | 3 answers | 0

3

answers

Question


Problem with structure in image processing
I have a structure of images and I want to make some processing on them. I put them on a list but when I try to save each one of...

8 years ago | 1 answer | 0

1

answer