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João Mendes


Last seen: 1 year ago |  Active since 2019

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Question


Speckle Noise Estimation in Ultrassound images
Hello, Is there any way to estimate the noise (or get a noise value) of an image, concerning speckle noise? Thank you

2 years ago | 1 answer | 0

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answer

Question


Deep Network Designer with dicom images
Hi, I am trying to use the Deep Network Designer app. However, when I try to load the dataset - that I arranged as suggested - ...

2 years ago | 1 answer | 0

1

answer

Question


Using fitcdiscr without feature normality
Hi! I was making a classification task (training a classifier) using fitcdiscr. Is it still possible to use it if my features (...

3 years ago | 1 answer | 0

1

answer

Question


Bayesian Optimization Hyperparameters .
Hi to all, Can any one help me to understand how bayesian optimization works in the task of finding the best hyperparameters o...

3 years ago | 1 answer | 0

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answer

Question


Image Registration (imregister)
Hi, I am currently using the imregister function in MATLAB. I would like to know a little bit more about image registration,...

3 years ago | 0 answers | 0

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answers

Question


Proble with imnoise function
Hi to all, Does anyone some the "formula" that is used to add gaussian white noise to the image? Thanks in advance, J

3 years ago | 1 answer | 0

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answer

Question


SVM: fitcsvm generalization rate problem
In fitcsvm help page, this is shown: What do they mean by "generalization rate" ? Thanks, J

3 years ago | 0 answers | 0

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Answered
KNN clasiffier and KNN clasification
Try this. Check the examples: https://www.mathworks.com/help/stats/fitcknn.html Tell me if it helps, J

3 years ago | 0

Question


fitcsvm cross-validation
Hi, I am training a SVM classifier with the following code: SVM_1=fitcsvm(X_train, y_train, 'OptimizeHyperparameters', 'all','...

3 years ago | 1 answer | 0

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answer

Question


Having graycomatrix rescaling problem
Hi to all, I am having some trouble using the graycomatrix function. I tried to read the documentation but that did not answere...

3 years ago | 1 answer | 0

1

answer

Question


Breast Density in Mammography
Hi to all, Does anyone knows of any app/code to classify mammograms in density terms? Or even an app that computes a density v...

3 years ago | 0 answers | 0

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answers

Question


Add noise to an image
Hi everyone, I wanted to add noise to an image (mammogram), in a way that simulates the effect of having a lower dose. Does an...

4 years ago | 0 answers | 0

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answers

Question


Support Vector Machine - Plots
Hi to all, Can anyone please explain what do these plots mean when I'm optimizing my model when using fitcsvm? It's my first ti...

4 years ago | 0 answers | 0

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Question


ClipAlphas in fitcsvm, for machine learning
Hi to all, I was exploring the fitcsvm function and got stuck with ClipAlphas parameter, it is set to true as default, but why ...

4 years ago | 0 answers | 0

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Answered
how to count the number of a specific value in a cell array and how to access the index of each value
To know the positions of the active checkboxes you can write: active= find([a{:}]==1) To know how many are active, i.e., how ...

4 years ago | 0

Answered
While Loop Homework Question
Can you use for loops? or only while?

4 years ago | 0

Question


Computing Correlation in graycoprops
Hi everyone, I was trying to check my calculations with the results provided by graycoprops, however, they don't match. I don...

4 years ago | 0 answers | 0

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Question


Get gray level run length matrix
Hi, How can I extract the run length matrix - only that, no features attached - from a given image (matrix) ? Is there any fu...

4 years ago | 0 answers | 0

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answers

Question


Retrain model, Classification Learner
Dear all, How can I retrain a model that I created with MATLAB app Classification Learner? Thanks, J

5 years ago | 1 answer | 0

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answer

Question


Segment 2D image into 3 equal parts
I'm currently trying to draw 2 vertical lines at each lung, to divide them into three almost equal parts but I'm having some tro...

5 years ago | 0 answers | 0

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answers

Question


Control image transparency with a slider- appDesigner
Hi all, I'm trying to control de tranparency of two images using a slider. Currently, I don't know how to do the code for t...

5 years ago | 1 answer | 0

1

answer

Question


.nii to .mat
Hey guys, I was wondering if you could help me out. I'm having some problems opening medical images in MATLAB. Their extens...

5 years ago | 2 answers | 0

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answers