VLFeat - a computer vision toolbox

The VLFeat open source computer vision library that implements popular

• feature extraction algorithms (such as SIFT, MSER, and quick shift),
  
• clustering algorithms (such as integer k-means, hierarchical k-means, and agglomerative information bottleneck), and
  
• matching algorithms (such as randomized kd-trees).
  

It is written in C for efficiency and compatibility, with interfaces in MATLAB for ease of use, and detailed documentation throughout.