CAPTCHA Challenge Tradeoffs: Familiarity of Strings versus Degradation of Images.

Sui-Yu Wang Jon Louis Bentley

Published in: ICPR (3) (2006)

Keyphrases

image database
three dimensional
image data
ground truth
object recognition
multiple images
input image
test images
image features
rigid body
image analysis
image classification
image degradation
image collections
image set
image understanding
edge detection
gabor filters
image registration
original images
image matching
image regions
segmentation method
image annotation
image structure
synthetic and real images
image retrieval
image processing