A Highly Legible CAPTCHA That Resists Segmentation Attacks.

Henry S. Baird Michael A. Moll Sui-Yu Wang

Published 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