Four-Dimensional Usability Investigation of Image CAPTCHA.

Junnan Yu Xuna Ma Ting Han

Published in: CoRR (2016)

Keyphrases

image data
single image
input image
multiscale
image features
image content
high resolution
image pixels
image classification
segmentation method
template matching
image regions
post processing
image representation
image retrieval
test images
region of interest
pixel values
image noise
pixel level
computer vision
spatial information
edge detection
low level
image analysis
image segmentation
scale space