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sidra


Manipal Institute of Technology

Active since 2013

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Professional Interests: Image Processing

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Is this the right way of projecting the training set into the eigespace?
I have computed PCA using the following : function [signals,V] = pca2(data) [M,N] = size(data); data = re...

11 years ago | 0 answers | 0

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Question


Why is the predicted_label +1 even though it should be +1? Using LIBSVM
I extracted the principal components of training and testing data. 'trainingdata.train' has feature values from both +1(face 1)...

11 years ago | 0 answers | 0

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Question


Writing labels & data to a CSV file for face recognition.
I have done PCA for 21 images of the same person in different conditions. LAst step of the PCA is projection of original data : ...

11 years ago | 1 answer | 0

1

answer

Question


Guidance in writing mexFunction for convert.c
I have data in CSV (comma seperated value) format, i need it in the libsvm format. I found a c code to do it: http://www.csie.n...

11 years ago | 1 answer | 0

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Answered
Is this the right way to obtain first PC?
Is this the right way?

11 years ago | 0

Answered
Can PCA be applied directly on an image?
Walter, it works fine for a single image but when i try the same on array of images i get the error : "Array dimensions must...

11 years ago | 0

Question


Is this the right way to obtain first PC?
I have used the following standard code for PCA. % code %function [signals,PC,V] = pca1(data) % PCA1: Perform PCA usi...

11 years ago | 1 answer | 0

1

answer

Question


Can PCA be applied directly on an image?
Can PCA be applied directly on an image, in contrast to a matrix(in which rows correspond to observations & columns to variables...

11 years ago | 2 answers | 0

2

answers

Question


What is wrong with the code?
I have created an imagearray consisting of 434 images, then extracted features from this imagearray using a function, now i want...

11 years ago | 3 answers | 0

3

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Answered
why its giving error? Its saying cant read A1(2.3), its not logical
Reading up about matrix indexing will be helpful in your case. Try the link below: http://www.mathworks.com/help/matlab/math...

11 years ago | 0

Question


How do i obtain only the first principal component?
For certain measurements i need to obtain only the numeric value of the first principal component from the matrix. Can someone p...

11 years ago | 2 answers | 0

2

answers

Question


Creating a feature vector
I have calculated texture, color and shape features on an image.But those just add up to 12 features. I read that people extract...

11 years ago | 1 answer | 0

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Question


Finding the closest axis for each principle component.
http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CC4QFjAB&url=http%3A%2F%2Fsatoh-lab.ex.nii.ac.jp%2Fusers%2...

11 years ago | 1 answer | 0

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Answered
how to assign zero value to all pixels in an image ?
I don't understand what purpose setting all the pixel values to zero would achieve. Nevertheless One of the method is: Yo...

11 years ago | 0

Answered
how to convert a gray scale image to color image using matlab
Nirmala , try the following , its a very simple and efficient code to convert grayscale images to RGB using a specified colormap...

11 years ago | 2

Answered
Feature Extraction & Selection from a standard Face Image.
Could anyone help, please?

11 years ago | 0

Question


Feature Extraction & Selection from a standard Face Image.
I need to extract and select features from a face image. I have extracted the basic Texture , Color and Shape features using the...

11 years ago | 4 answers | 1

4

answers