Wenlong

Imperial College London

Active since 2012

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Question

How to get average image of a set of .bmp images?
Hi, all I am not stuck with a problem. I have a set of .bmp images, which are actually images of faces. I'd like to get the a...

11 years ago | 1 answer | 0

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answer

Question

How to use the fitting curve of a histogram?
Hi, all I am using histfit to find a fitting curve to my histogram. According to the observation, it should be gaussian. ...

11 years ago | 1 answer | 0

1

answer

Question

How to run a chi-square test?
Hi all, I am trying to run a chi-square test on my data. I have a vector of eigenvalues from PCA and they are ordering in...

11 years ago | 1 answer | 0

1

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Question

Problem with creating .bmp images
Hi, all I'm running PCA on ORL human face image database. What I want to achieve it to extract the principal components, then...

11 years ago | 1 answer | 0

1

answer

Question

Why covariance matrix is computed like this?
Hi, all I know am asking a quite fundamental question, but I really can't remember the answer that my teacher taught me in cl...

11 years ago | 1 answer | 0

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Question

How to write a .bmp format file?
Hi, all I am using Principal Component Analysis (PCA) to analyze a 2D facial image database (ORL database). Here is my code ...

11 years ago | 1 answer | 0

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answer

Question

What is the difference between PCA solutions?
Hi, all I am looking into two solutions of PCA(Principal Component Analysis), which are covariance matrix and singular value ...

11 years ago | 1 answer | 0

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answer

Question

Problem with setting axis ticks
Dear all, I am using plot to visualize my data, here is my code set1 = [65 42 31 23 20]; set2 = [63 40 28 19.5 17]; ...

12 years ago | 1 answer | 0

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Question

How to calculate an irregular shape area?
Dear all, I have a shape model in 3D space. I project it onto a 2D plane. Now I have to calculate the area of its projection...

12 years ago | 1 answer | 0

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Question

How to get the number of samples of each bar in histogram?
Dear all, I have a mxn matrix where has n samples and each of them have m variables. I use hist(x, 20) to build histograms on...

12 years ago | 1 answer | 0

1

answer