A new image-based CAPTCHA using the orientation of the polygonally cropped sub-images.
Jong-Woo KimWoo-Keun ChungHwan-Gue ChoPublished in: Vis. Comput. (2010)
Keyphrases
- image data
- image classification
- three dimensional
- image analysis
- ground truth
- relative orientation
- input image
- rigid body
- image database
- gabor filters
- object recognition
- image filtering
- test images
- image registration
- image features
- feature points
- image retrieval
- image collections
- orientation estimation
- image based modeling
- lighting conditions
- image set
- edge detection
- position and orientation
- spatial frequency
- precise localization
- linear features
- multiple images
- region of interest
- scale space
- image matching