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Questions tagged [vlfeat]

VLFeat is an open source library that implements popular computer vision algorithms

VLFeat includes implementations of HOG, SIFT, MSER, k-means, hierarchical k-means, agglomerative information bottleneck, SLIC superpixels, and quick shift. It is written in C for efficiency and compatibility, with interfaces in MATLAB for ease of use, and detailed documentation throughout.

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vl_sift Why two frames have the same position

I am a freshman of vl_sift. When I ran the codes from the website, I have found a problem which I didn't understand. After executing [f,d] = vl_sift(I) ; I checked the f. col 11 12 15.6534681320190 …
Anguslilei
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need advise on sift feature - is there such thing as a good feature?

I am trying out vlfeat, got huge amount of features from an image database, and I am testing with the ground truth for mean average precision (MAp). Overall, I got roughly 40%. I see that some of the papers got higher MAp, while using techniques…
Karl
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Efficiently segmenting an image into grid in matlab

Currently, I am using the code below to segment an image into a grid of cellSizeX pixels times cellSizeY pixels: grid = zeros(cellSizeX, cellSizeY, ColorCount, cellTotalX, cellTotalY); for i = 1:cellSizeX:(HorRowCount) for j…
Karl
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Building vocabulary in bag of sift feature encoding

I am working on a scene recognition problem with bag of visual words. Here is a code that I adapted from the Internet. In the training dataset, I have 5 classes each having 100 images. In the random test dataset, I have 5000 images. I understand…
wannabegeek
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printf() doesn't work in source code?

I'm trying to modify VLFeat source code in particular the function vl_vlad_code in this file. Now, since it is the first time that I edit the source code of such a library, I started with something simple, like printing an Hello World! at the…
justHelloWorld
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Difference between Libsvm and vl_feat SVM

I am working on image classification project. I utilized Lib-SVM and Vl_feat SVM implementation train a linear kernel. Both classifiers returns different result can some one explain what is the different between two libraries.
vicky
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VLFeat Xcode c++

Im working on Xcode 7.2 Opencv 3.0 C++ and try to link VLFeat into the project. but some VLfeat function was working fine but when come to gmm and fisher it give error as in the picture. I have compile the Xcode VLfeat program provided by the URL…
D_9268
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vlfeat kmeans C++

I'm trying to use vlfeat kmeans algorithm in C++ as I have used it before in matlab. I have two questions. I can't find a function to return the assignment for each data input. do I have to use the distance function to manually find the…
user1871528
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