Supporting Noise-Free Queries in Large Image Databases. Image Retrieval. Database Images. Query Image. Image Database. Feature Extraction. Feature Extraction. Select. Compare. Metadatabase. Feature Vectors. Query Result. Noise-Free Queries (NFQ’s). NFQ is more precise .
Sampling query at 3 different rates
A fixed sampling rate for all database images (a)
A higher rate to find larger matching objects (b)
The same rate to find matching objects of the same size (c)
A lower rate to find smaller matching objects (d)
The sizes of queries are different from those of database images
Rationale: Low-ranked Images do not make it to the user.