Lamis Ghoualmi

13 Questions 19 Answers 0 Followers

Questions related from Lamis Ghoualmi

What is the difference between feature selection and feature reduction?

Feature selection approaches and feature reduction are very close. However, feature selection allows selecting features among a certain objective function to be optimised without transforming the...

30 December 2015 9,617 11 View

How can I apply PCA to reduce Gabor features?

Hi everybody, I'm working with Gabor features, I want to apply the PCA to reduce the features number, but I don't know how to begin . I have a matrix composed of N samples with dimension of 300...

16 December 2015 3,344 10 View

Is there any suggestion for calculating the threshold to accept or reject a person in biometrics?

sometime we fix only one threshold for the whole database but some time we need to calculate the threshold ( variance interclass and intraclass...

19 March 2015 6,931 2 View

Can someone provide me with an open source code of Genetic Algorithm?

Hi, everybody i'm looking for an open source code of GA to compare with someone can help me please?

10 December 2014 3,200 14 View

How to use the Forward Feature Selection in biometrics ?

Please someone can help me how to use forward feature selection in biometrics

03 November 2014 3,608 2 View

Can anyone help with score level fusion using sum rule?

I try to do a score level fusion of two modalities but the recognition rate of one of these two modalities are better than the fused ones.

29 July 2014 1,322 7 View

Do we need to normalize the score inf feature extraction?

When we have features of two modalties extracted with the same method of feature extraction, do we need to normalize the score?

14 June 2014 7,621 2 View

Does anyone know a source code (matlab) for iris segmentation and normalization?

The preprocessing phase for iris (segmentation and normalization)

28 May 2014 7,987 15 View

Can anyone help to compare different methods of preprocessing testing them on a biometrics database?

It is difficult to compare the methods because in each method the quality and content of image changes. That implies that each method does not have the same threshold (in database), please help...

26 April 2014 9,716 1 View

Is it normal that the histogram equalization and adaptative histogram equalization gives worse quality then the original image?

If so, please give the efficiency of a system less then the original images in the database.

25 April 2014 8,863 7 View

In feature extraction with SIFT algorithm, how we match the 6 feature?

Especially in SIFT the feature, vectors don't have the same size. What do we do when we match them with another 6 features with different sizes?

23 April 2014 9,304 7 View

How many test images should we use to calculate the accuracy of a biometrics system?

I want to know an approximative number of images for training and testing

13 April 2014 2,045 2 View

How we calculate the threshold for drawing the ROC curve in biometrics?

In training we calculate the thresholds, but what is the most efficient method?

11 April 2014 1,887 7 View