Fast image classification by vocabulary tree based image retrieval

摘要

Systems and methods are disclosed to categorize images by detecting local features for each image; applying a tree structure to index local features in the images; and extracting a rank list of candidate images with category tags based on a tree indexing structure to estimate a label of a query image.

主权项

1. A method to categorize images, comprising:
detecting local features for each image; applying a tree structure to index local features in the images; extracting a rank list of candidate images with category tags based on a tree indexing structure to estimate a label of a query image, and determining a category of the query image C(q) byC⁡(q)=arg⁢⁢maxNc=1⁢∑i=1K⁢⁢1⁢(C⁡(Ii)=c)i,where retrieved top K candidate images Ii are sorted according to matching score si in descending order {Ii,si}1K, si>sj, ∀i wherein the above steps are computer implemented.