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### Arab academy for science and technology

Active since 2016

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Question

why to use squared energy and mean amplitude as features of gabor filters?
I was reading a paper about using gabor filters for feature extraction, and the author mentioned that he represented the gabor ...

5 years ago | 0 answers | 0

### 0

Question

Is there a way to plot a confusion matrix of the cross validation results?
Can somebody tell me how to plot a confusion matrix of the crossval result? CVMdl = crossval(classifier,'HoldOut',0.08); ...

5 years ago | 2 answers | 1

### 2

Question

why do I have different results when i reuse the generated code from the classification learner app ?
Hello, I need some guide on how to reuse the generated code because it seems that i am making a mistake. I have used an input o...

5 years ago | 0 answers | 0

### 0

Question

how to do cross validation for multi svm classification ?
I am totally confused about how to do cross validation for this multisvm code,I have tried the crossval function but it is not w...

5 years ago | 0 answers | 0

### 0

can somebody help me to generate a confusion matrix for this multisvm code?
confMat = confusionmat(Train_Label, results)

5 years ago | 0

| accepted

Question

can somebody help me to generate a confusion matrix for this multisvm code?
I have been trying to plot a confusion matrix for this svm code but im reaching nowhere,so the purpose of my code is to classif...

5 years ago | 1 answer | 0

### 1

Question

can someone help me with this svmtrain's error "Error using svmtrain ,TRAINING must be a numeric matrix"?
I am trying to figure out why i am seeing this error but i am stuck, here is the code: [X,T] = catadataset; xdata = X; ...

5 years ago | 0 answers | 0

### 0

Question

what does this error mean?"Array formation and parentheses-style indexing with objects of class 'matlab.io.datastore.ImageDatastore' is not allowed"
Can someone help me to understand this error please and how to fix it? I am having a dataset of 83 images, It is divided into 5...

5 years ago | 2 answers | 0

### 2

Question

why i am having 'Training data for an autoencoder must either be a matrix, or a cell array of equal size images.' error though my images have the same size?
my feature vector file is csvlistdnewtarget.mat and it is a 1x83 feature vector of 83 images, all of the 83 images have the same...

5 years ago | 0 answers | 0

### 0

Question

I can't load my own dataset!
I am having a feature vector of 1X83 and a target matrix of 5X83 and both of them are in .mat format i wanted to creat a datas...

5 years ago | 2 answers | 1

### 2

Question

Is this the correct way to prepare the input and target vectors to feed them to neural network?
I am having a dataset of 50 images, i extracted the features of the 50 images and stored them as vectors in a matrix using the C...

5 years ago | 0 answers | 0

### 0

Question

what would be the right feature extraction methods for these images?
I am trying to classify cataract images, First i crop out the pupil area and save it in another folder, then i execute the wavel...

5 years ago | 0 answers | 0

### 0

Question

why I am having this "Cell contents assignment to a non-cell array object."error?
I am trying to store Approximation vector of every image in a CSV file , so that every column or every row in the CSV file repre...

5 years ago | 1 answer | 0

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Question

why haart2 function isn't found in matlab ?
I am trying to use haart2 in matlab , but everytime it shows me this error Undefined function or variable 'haart2'. ...

5 years ago | 2 answers | 0

### 2

Question

what is wrong with the blockproc function in my code?
I am trying to write the function 'replace' that accesses every block in the image, keeps the first 2000 cooefficient and sets t...

5 years ago | 1 answer | 0

### 1

Question

How to remove the high frequency DCT coefficients without losing the image dimensions ?
Im in stuck in this part of my code, after applying the DCT on the image, I set the coefficients that have energy lower than 5...

5 years ago | 0 answers | 0

### 0

Question

how to choose the n' coefficients of DCT function applied on JPG image?
1) DCT 2) Quantization 3) Compression (zig-zag style like JPEGs). Does the dct2 function perform all of these functions aut...

5 years ago | 1 answer | 0

### 1

Question

why does my colorbar look like this?
why does The colorbar looks gray all the time and matlab gives me this warning ?: Warning: Error updating ColorBar. While se...

6 years ago | 1 answer | 0

### 1

Question

How to use DCT to create feature vectors for neural networks?
I want to use DCT to create feature vectors for gray images and then use it for pattern recognition using neural network. Is th...

6 years ago | 1 answer | 0