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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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ImportError: No module named vlfeat

I have installed VLFeat on anaconda environment successfully, but once I wanna import it, shows >>> import vlfeat Traceback (most recent call last): File "", line 1, in ImportError: No module named vlfeat Any idea about this?…
S.EB
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VL_feat Matlab GCC can't compile

I was trying to compile the function c_eoverlap in matlab following the instruction here: http://www.robots.ox.ac.uk/~vgg/research/affine/evaluation.html#eval_soft Of course, it wouldn't work out... My Matlab version is 2018a which is pretty new and…
LYu
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I can't run VLFeat on matlab

I am trying to install vlfeat-0.9.20 in Matlab but i have the following error any help, please? run('C:\Program Files (x86)\MATLAB\R2010a\vlfeat-0.9.20\toolbox\vl_setup') Warning: Name is nonexistent or not a directory: C:\Program Files…
C.S Beba
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Feature Combination for Object Detection

I am trying to combine LBP-HOG for object detection. This is actually a part of model free object tracker. I have extracted both features and fed them in to a Linear SVM. here is the code. svm = trainSVM( pos{j},neg{j} ); // for LBP features where…
Saqib Ali
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Get the 5 most similar images

I would like to compare which are the 5 most similar images to an input image. To do this I thought to use the SIFT (VLFeat library) and compare the respective descriptors. So I use the vl_ubcmatch (doc here) method to calculate the similarity…
user7558372
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Memory Limitation when Extracting VLAD from SIFT Descriptors in VLFeat with Matlab

I recently asked how to extract VLAD from SIFT descriptors in VLFeat with Matlab here. However, I am running up against memory limitations. I have 64GB RAM and 64GB Swap. all_descr = single([sift_descr{:}]); ... produces a memory…
Chris Parry
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Extracted Keypoints and Features are not at points of interest

I am working with an image that has blue and gray spots. Eventually I want to recognise all the images in a dataset that have this scene. I am using SIFT for this. I tried to map the keypoints that looks like this: The generated keypoints are not…
wannabegeek
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SIFT descriptors values: OpenCV vs VLFeat

I'm trying to compare the SIFT implementation of OpenCV and VLFeat. I noticed that the descriptors value for VLFeat are integers, such as: 0 0 0 0 0 0 0 0 0 0 0 17 45 20 26 0 1 ... While for OpenCV: 0.0391555 0 0 0.0998274 0.235747 0 0 0.0276871…
justHelloWorld
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Function takes longer time to execute if OpenCV detectMultiScale() is not called before it

I have a time-critical function which takes 30ms (on average) to execute if I call OpenCV's detectMultiScale() just before. It takes 40-45ms if I don't call detectMultiScale(). The problem seems very strange as the 2 functions have nothing to do…
Siddhanta Chakrabarty
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Import .def files in Cython

Short version: How to import .def files in Cython? Long version: I am writing a Cython wrapper for VLFeat library. So there are two parts a def of a Cython module a definition file with a .pxd suffix, containing C declarations that are to be…
Simmi Mourya
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Write VLFeat GMM on file

I want to train a VlGMM in C++ from VLFeat object on an image dataset and re-use it in different executions. I would like to read and write it on file, but I didn't find any function for that. Is that possible?
justHelloWorld
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mex error during vl_compilenn

I'm trying to install MatConvNet, as described here. When I run vl_compilenn, I get the following error: >> vl_compilenn Building with 'Microsoft Windows SDK 7.1 (C++)'. MEX completed successfully. % ... repeated many times, then suddenly : Error…
jeff
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vl_dsift() Function in Vlfeal Matlab toolbox

I've just downloaded the Matlab toolbox Vlfeat to do some research of the descriptor denseSIFT. It has a wonderful function called vl_dsift() which satisfy me. However, I still have a little question about the description of this function in the…
wythia
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VL_SIFT - Undefined function or variable

I try to make use of VLFeat library. So, I've downloaded the package and run vl_setup script. But when I create a new script and type this code: I = imread('imhog.jpg'); image(I) ; I = single(rgb2gray(I)) ; [f,d] = vl_sift(I) ; perm =…
sapio_l
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default vlfeat sift return less features than sift implementation of D.lowe

As I mentioned in title default vlfeat sift returns less features than sift of D.Lowe. How could I let vlfeat sift return as much as features as D.Lowe's does. Or can we only offer position info of key-points to extract sift features with vlfeat…
neouyghur
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