A Highly Legible CAPTCHA That Resists Segmentation Attacks.
Henry S. BairdMichael A. MollSui-Yu WangPublished in: HIP (2005)
Keyphrases
- image segmentation
- level set
- segmentation method
- segmentation algorithm
- multiscale
- fully automatic
- countermeasures
- medical images
- active contours
- brain mri
- region growing
- shape prior
- object segmentation
- malicious users
- optimal segmentation
- segmented images
- pixel level
- segmentation accuracy
- segmentation errors
- energy function
- edge detection
- three dimensional