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Feeds
Submitted
Biometric modality quality metric validation/evaluation.
An implementation of the validation of a biometric quality metric.
8 years ago | 1 download |
Question
how can show a 3-D plot of grayscale values for a fingerprint image
Hello, I want to that described in the title. How can I calculate the 3rd values. Is that the gradient or something else? Thank...
9 years ago | 0 answers | 0
0
answersQuestion
binary file operations write and read
Hello, I am trying to write some 2D coordinates into a binary file. However, what I read from the file that had been writen i...
10 years ago | 0 answers | 0
0
answersQuestion
how can I obtain the coordinates of the polygon border pixels
Hello, For example, there is an image on which I have a set of points and the vertices of the convex hull of these points. We...
10 years ago | 0 answers | 0
0
answersQuestion
How can I know some special points according to the 'probplot'
For example, I have a group of points in 2D plane. Then, I make a probplot (normal) of them. p = [xi, yi] i = 1, ..., N...
10 years ago | 0 answers | 0
0
answersQuestion
To calculate or estimate a center of a convex hull
I am trying to find a center or estimated center of a convex hull of a set of points. In Matlab, we can obtain the convex hull o...
10 years ago | 2 answers | 0
2
answersQuestion
To calculate the angles of the Delaunay triangles
I am trying to calculate the 3 angles of each triangle generated by Delaunay triangulation. For example, I have already obtained...
10 years ago | 3 answers | 0
3
answersQuestion
Distance between image block and image centroid of fingerprint
I want to calculate the distance between each block centered at (xi, yi) and the centroid of fingerprint image located at (xc, y...
10 years ago | 0 answers | 0
0
answersQuestion
How I can configure Borland C++ in 2011a
I am using Matlab2011a. I want to compile a external toolbox which needs to use Borland C++. But Matlab doesn't seem to support ...
10 years ago | 1 answer | 0
1
answerQuestion
How can I calculate the perimeters of Delaunay triangles?
Hello, Assume I have a set of point coordinates in a 2D plane. x = [ 16 16 16 17 18 19 19 20 21 2...
10 years ago | 1 answer | 0
1
answerQuestion
(question about biometrics) What is the difference between these ROC curves?
Hello, I am reading something about ROC curve. And I found that the curve is different given in different publications. So, I...
10 years ago | 1 answer | 0
1
answerQuestion
how I can use gaussian mixture model to calculate a statistical value
Hello, I have a set of spacial point, i.e. coordinate (x,y) of each point. I want to use the gaussian mixture model. But, how...
11 years ago | 1 answer | 0
1
answerQuestion
how can I draw a grid over a specified region of the image
For example, I have an image of 400*360. I want to draw small grids over a region of the image. E.g. draw small grids of 20*20 ...
11 years ago | 1 answer | 0
1
answerQuestion
how I can analyze this magnitude of 1D signal
This is a DFT magnitude graph of a set of 1D points. How can I analyze it? Can I say that the lowest frequency contribute most ...
11 years ago | 2 answers | 1
2
answersQuestion
How can I calculate a dirac function of 2D discrete signal
For example, I have 20 2D points, as the input signal. (xi, yi) i = 1...Z , Assume that Z = 20, i.e. 20 points. How can I cal...
11 years ago | 2 answers | 0
2
answersQuestion
how can I calculate this joint distribution
Suppose that one object has two properties, and they are two discrete variable, as X and Y. The population number of both X and ...
11 years ago | 0 answers | 0
0
answersQuestion
a series of point coordinates are known, and their orientation (angle). Calculate gradient
For example, 10 points' coordinates are known, as (xi, yi) i =1 ... 10 and a corresponding angle of each point is known, as ai ...
11 years ago | 1 answer | 0
1
answerQuestion
about the calculation of phase spectrum for a set of coordinates
I want to implement an approach for calculating Phase spectrum of a set of coordinates. In the paper, it is described as 3 equat...
11 years ago | 1 answer | 0
1
answerQuestion
about calculating a measure of an image feature vector
Hello, I want to ask a question about calculating a measurement of an image feature vector. For an image, several feature w...
11 years ago | 1 answer | 0
1
answerWhy my calculation of standard deviation of an image is different from the built-in function
thank you all, guys.
11 years ago | 0
Why my calculation of standard deviation of an image is different from the built-in function
However, I found where the problem happens. If I calculate standard deviation of an image without converting it into double, i...
11 years ago | 0
Question
Why my calculation of standard deviation of an image is different from the built-in function
Hello, My code is shown below, and I opened the built-in function. I found it just calculates the square root or variance. S...
11 years ago | 4 answers | 0
4
answersQuestion
Ask questions about Gabor filter's parameters
I am trying to implement a 2D Gabor filter, but I don't understand several parameters of this filter. For example, I use a g...
11 years ago | 0 answers | 0
0
answersQuestion
How can i obtain such 3-D meshgrid image of ...
Hello, Acutally, I want to generate a 3-D plot for a Gabor filter's (2D matrix) real part and imaginary part. But I don't kn...
11 years ago | 1 answer | 0
1
answerQuestion
how can i understand this code (about Gabor wavelet)
I download a code at vision lab of UCSB. It is about Gabor wavelet, and there are something that I don't understand in the code....
11 years ago | 1 answer | 0
1
answerQuestion
How should I understand this code
Hello, I have a code segment of generating gaussian noise, but I don't understand why it does so. p=1+rand(1)*99; Gaussi...
11 years ago | 1 answer | 0
1
answerQuestion
If a toolbox doesn't exist in my matlab, how can i do about that?
Hello, As the title. Anybody has such an experience?
11 years ago | 0 answers | 0
0
answersQuestion
How can I display a distribution of one data set on a graph?
Hello, I want to calculate a data set's distribution and display it on a graph. For instance, I have a previously computed da...
11 years ago | 0 answers | 0
0
answersQuestion
Has matlab a function to swap a vector? And generate a graph with 3 datasets.
Hello, Q1. I want to swap a vector like below, Is there a built-in function in Matlab? a = [ 1 2 3 4 5 6 ] a = swap(a) = [...
11 years ago | 1 answer | 0
1
answer
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