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# Stelios Fanourakis

180 total contributions since 2017

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Question

How to make Chan Vese active contour more robust?
Hello I am using Chan Vese active contour to segment some Ultrasound images. I was wondering whether there are several ways t...

4 days ago | 0 answers | 0

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answers

Question

Why can't I run my python script from Matlab?
Hi I am trying to use this line py.intervals.py(); Where intervals is a python script. I get the error >> py.interva...

13 days ago | 2 answers | 0

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answers

Question

How can I estimate the average for each one of the intervals in an x axis?
Hi I need a method to split my x axis into intervals and estimate the average for each one of the intervals. The plots are po...

13 days ago | 1 answer | 0

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answer

Question

How can I define two tones in a grayscale image
Hi I have an ultrasound image with lots of gray tones. I want to threshold the image by defining two of its tones. The higher...

14 days ago | 1 answer | 0

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answer

Question

How can I make this active snake contour more robust??
Hello I am using a ChanVese active contour from the MathWorks community. I need to make it more robust. I need it to segment ...

17 days ago | 0 answers | 0

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answers

Question

How to write my own active contour?
Hello I am interesting writting my own active contour for automated ultrasound segmentation. It coulb be similar to Chan Vese...

23 days ago | 0 answers | 0

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answers

Question

Why region_seg_demo is not working for the imcrop size of my preference?
Hi I use the below code I found in the Mathworks community S = uigetfile('*'); Img= imread(S); Img = double(Img(:,:,1...

30 days ago | 0 answers | 0

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answers

Question

Why do I get NaN values?
I have used exactly the same code for Sheet 5 and different column names and I get numerical values but when I use it at Sheet 6...

1 month ago | 0 answers | 0

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answers

Answered
How to use polyfit to get the difference out of two functions?
Actually, both datasets are high degree polynomials e.g 6. They are almost identical and need to find their difference. How do I...

1 month ago | 0

Question

How to use polyfit to get the difference out of two functions?
Hi I have two datasets (X,Y). For every value of Y that corresponds to a value of X. I am thinking of applying a polyfit com...

1 month ago | 3 answers | 0

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answers

Question

How do I compare two images?
Hi I have two images. One was manually segmented and the other used an automated method. Both images segments the same in...

2 months ago | 2 answers | 0

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answers

Question

How do I define the bottom row?
Hi I have acquired several ultrasound images with different pin sizes, for a validation test of mine. I know the real pin s...

2 months ago | 0 answers | 0

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answers

Question

Suggestions of how to improve the segmentation?
Hello I got this segmented image (see attached), using a ChanVese contour. The problem is that after a several number of iter...

2 months ago | 0 answers | 0

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answers

Question

What would be the outcome of this line?
Hi If I use this line code for col = col1 : col2 row2 = find(mask(:, col), 1, 'last'); % Get bottom row of mask ...

3 months ago | 0 answers | 0

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answers

Question

Why I get extra columns with irrelevant results?
Hi I use those lines to get the number of pixels among several rows and columns for col = 390 : 466 h = imdistline(gca,...

3 months ago | 1 answer | 0

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answer

Question

Why this incongruency happens regarding number of pixels?
Hi I use the image I attached. I use this line to get the sum of pixels from row 307 to 366, at columns from 464 to 490 for c...

3 months ago | 1 answer | 0

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answer

Question

How can I make this active contour more robust?
Hi I attach the segmented images. As you can see the contour is not robust enough. As a result, there are gaps between the hea...

3 months ago | 0 answers | 0

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answers

Question

How to measure the pixels of the central column
Hi See attached image please. I want somehow, Matlab, identify the central column of pixels that start from the top (red p...

3 months ago | 0 answers | 0

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answers

Question

How can I make the active contour work more efficiently?
Hi. As you can see from the image I attach I am trying to segment the image, using a Local Gaussian Distribution algorithm ac...

3 months ago | 0 answers | 0

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answers

Question

Just a small modification to go please
Hi I have modified my code from previous times. I am so close to achieve what I want to achive but I know that I cannot surpa...

3 months ago | 1 answer | 0

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answer

Question

Modified but still get errors. Is it more clear to help me?
Hi I just modified the code I am trying to use in order to select one out of two images. I use that code MyMatrix = Img; ...

3 months ago | 1 answer | 0

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answer

Question

What is this error about after am trying to indice an image out of a uibutton and uicontrols ?
I use this script bg = uibuttongroup('Visible','off',... 'Position',[0 0 .2 1],... 'Sele...

4 months ago | 0 answers | 0

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answers

Question

What is wrong with this uibutton and callback function?
Hi I want to have two radio buttons pick one image at a time for further processing. I use this code. bg = uibuttongroup('Vi...

4 months ago | 2 answers | 0

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answers

Question

How do I find and how do I change the starting point of the active contour?
Hi I use the below code for automated segmentation. It is granted, that every time the circular active snake contour will sta...

4 months ago | 0 answers | 0

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answers

Question

How to ideally erode this line?
Hi See attached image. Imagine, it is a line of a contour. I need to erode it to a point to be a nice clear curve with no ...

4 months ago | 0 answers | 0

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answers

Question

I need to chose between two images for postprocessing using uibuttongroup. Why is not working?
I have two images as Option 1 and Option 2. How to make it run and user be able to chose among the two images? Is it corr...

4 months ago | 1 answer | 0

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answer

Question

Are those spikes in the excel graph error and needs to be sorted?
Hi I attach a segmented image done in Matlab and an excel graph related to that image (and other images in series). What M...

4 months ago | 0 answers | 0

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answers

Question

How to make an interactive panel for the user to chose among several options
Hi I want to have a panel (User Interface) with 3-4 different cropping image options and the user shall be able to chose the ...

4 months ago | 1 answer | 0

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answer

Question

Is it the same when we say dpi (dots per inch) as pixels per inch?
Hello See question line. Are they equivalent terms? How someone can determine whether the image is appropriate for printing w...

4 months ago | 0 answers | 0

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answers

Question

What is this error about?
Hi I am trying to use an active contour and I get the error Error using contour (line 46) Input arguments for contour must ...

4 months ago | 0 answers | 0

answers

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