SEIMCHA: a new semantic image CAPTCHA using geometric transformations.

Maryam Mehrnejad Abbas Ghaemi Bafghi Ahad Harati Ehsan Toreini

Published in: ISC Int. J. Inf. Secur. (2012)

Keyphrases

geometric transformations
input image
image data
single image
image analysis
multiscale
image representation
image classification
image features
closed form
image content
similarity measure
image retrieval
image segmentation
high resolution
feature detectors
co occurrence
image quality
natural images
motion estimation
spatial information
test images
object recognition