TagCaptcha: annotating images with CAPTCHAs.

Donn Morrison Stéphane Marchand-Maillet Eric Bruno

Published in: ACM Multimedia (2010)

Keyphrases

image retrieval
image database
input image
image analysis
image collections
image understanding
image data
ground truth
edge detection

three dimensional
rigid body
test images
image regions
image classification
image registration
image features
small number

image processing algorithms
content based retrieval
satellite images
image matching
object recognition
lighting conditions
metadata
image annotation

multiresolution
semantic annotation
high resolution
fully automatic
spatial information
keypoints
natural images
feature points