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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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Matlab VLFEAT -multiple matching

I am performing SIFT matching with VLFEAT in Matlab. A single match is simple to display: I followed the tutorial. Update 1: (extracting the problem from my needs) Next, I consider 4 different views of the scene: I want to match the feature found…
marcoresk
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/usr/bin/ld: skipping incompatible foo.so when searching for foo

I am using Ubuntu 13.10 64bit and I am getting the following errors while compiling the python wrappers of vlfeat library. g++ -o _vlfeat.so ../../vl/aib.o ../../vl/generic.o ../../vl/hikmeans.o ../../vl/ikmeans.o ../../vl/imopv.o ../../vl/mathop.o…
user1403483
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VLFeat - How to fix "Warning: Name is nonexistent or not a directory"?

I downloaded the VLFeat lib from its git repository! I followed the instruction in the installation page. But when I ran the vl_setup command I got this warning: Warning: Name is nonexistent or not a directory: ..\Adv. 3D Computer…
Hadi
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How to get a fixed size SIFT feature vector?

I am trying to obtain feature vectors for N =~ 1300 images in my data set, one of the features I have to implement is shape. So I plan to use SIFT descriptors. However, each image returns different number of keypoints, so I run [F,D] =…
jeff
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What is the most efficient matrix representation in C++?

I hope that this question is not OT. I'm implementing a VLAD encoder using the VLFeat implementation and SIFT descriptors from different implementations to compare them (OpenCV, VLFeat, OpenSIFT). This is supposed to be an high performance…
justHelloWorld
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OpenCV VLFeat Slic function call

I am trying to use the vl_slic_segment function of the VLFeat library using an input image stored in an OpenCV Mat. My code is compiling and running, but the output superpixel values do not make sense. Here is my code so far : Mat bgrUChar =…
Frank
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Getting stuck on Matlab's subplot mechanism for matching images' points for vlfeat

I am doing vlfeat in Matlab and I am following this question here. These below are my simple testing images: Left Image: Right Image: I did a simple test with 2 simple images here (the right image is just rotated version of the left), and I…
Karl
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C functions with two round brackets pairs?

I'm sorry for the bad title, but nothing better came to my mind apart from "I don't understand this code". Please, feel free to propose a modification. I'm reading this code. I've never seen a C function like this one: static…
justHelloWorld
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Matconvnet error cl.exe not found

I have installed MatConvNet from VLFeat and I am trying to compile it. But as I am trying to run vl_compilenn it shows the following error: vl_compilenn Warning: CL.EXE not found in PATH. Trying to guess out of mex setup. > In…
user7029552
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How to ensure consistency in SIFT features?

I am working with a classification algorithm that requires the size of the feature vector of all samples in training and testing to be the same. I am also to use the SIFT feature extractor. This is causing problems as the feature vector of every…
StuckInPhDNoMore
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Assign descriptors to cluster centers after creating clusters using VLFeat

I'm clustering my data using k-means, but I'm not using standard algorithm, I'm using an approximated nearest neighbours (ANN) algorithm to accelerate the sample-to-center comparisons. This can be done easily with the following: [clusterCenters,…
guneykayim
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"loading shared libraries" error using VLFeat in C

I am trying to use VLFeat library in C, as given on the website http://www.vlfeat.org/gcc.html. I downloaded and installed the library. I use the glnxa64 architecture. The library is located at /A/B/C/vlfeat-0.9.18 My code is as follows: extern…
user2948166
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VLFeat installation for Python

I am new to Python and I want to install VLFeat on Ubuntu (13.04). I am using Eclipse 3.8. For Python, I have installed the PyDev extension on Eclipse. I have installed Numpy, but I don't know how to install VLFeat. I tried to use their website, but…
user3014479
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How to include C library (VLFeat 0.9.21) in iOS Project?

What are the necessary steps I need to take to compile VLFeat (an open source C library) and include it in my iOS project? Here is what I found out so far: I am not too familiar with the compilation and linking procedures, but from what I currently…
crazyshark
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How do I convert an cv::Mat to float pointer?

I want to represent the matrix of cv::SIFT descriptors cv::Mat descriptors as float*. This is because I want to use GMM from VLFeat (if you have any better solution, please let me know). This is the code that I came up…
justHelloWorld
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