caltech 256
DESCRIPTION
CALTECH 256. Greg Griffin, Alex Holub and Pietro Perona. Overview. 256 Object Categories + Clutter At least 80 images per category 30608 images instead of 9144. Caltech-101: Drawbacks. Smallest category size is 31 images: Too easy? left-right aligned Rotation artifacts - PowerPoint PPT PresentationTRANSCRIPT
CALTECH 256
Greg Griffin, Alex Holub and Pietro Perona
Overview
• 256 Object Categories + Clutter• At least 80 images per category
• 30608 images instead of 9144
• Smallest category size is 31 images:
• Too easy?
– left-right aligned
– Rotation artifacts
– Soon will saturate performance
Caltech-101: Drawbacks
€
N train ≤ 30
Caltech-256 : New Features
• Smallest category size now 80 images• Harder
– Not left-right aligned– No artifacts– Performance is halved– More categories
• New and larger clutter category
101 clutter 256 clutter
Collection Procedure• Similar to Caltech-101 (Li, Fergus, Perona)
• Four sorters rate the images1. good: a clear example2. bad: confusing, occluded, cluttered, or artistic3. not applicable: object category not present
• 92,652 Images from Google and Picsearch– 32.1% were rated good and kept
• Some images borrowed from 29 of the largest Caltech-101 categories (green)
Diminishing returns from Google Images
Try to find: blimp, clutter, grasshopper, picnic-table, refrigerator, watermelon
Test for Antonio Torralba
blimp clutter
watermelon refrigerator
picnic-table
grasshopper
Test for Antonio Torralba
blimp clutter
watermelon refrigerator
picnic-table
grasshopper
Localization?
Caltech-101/256 are not recommended for object localization tests
BenchmarksExpect roughly
half theperformance
Clutter: 827 Background Images
Stephen Shore, Uncommon Places
Acknowledgements• Rob Fergus and Fei Fei Li, Pierre Moreels for
code and procedures developed for the Caltech-101 image set
• Marco Ranzato and Claudio Fanti for miscellaneous help
• Sorters: Lis Fano, Nick Lo, Julie May, Weiyu Xu for making this image set possible with their hard work
Download:http://vision.caltech.edu/Image_Datasets/Caltech256