Enhancing the Security of Image CAPTCHAs Through Noise Addition.
David LorenziEmre UzunJaideep VaidyaShamik SuralVijayalakshmi AtluriPublished in: SEC (2015)
Keyphrases
- image noise
- input image
- background noise
- image data
- random noise
- image classification
- image retrieval
- image representation
- single image
- low frequency
- image structure
- multiscale
- low snr
- additive noise
- image content
- high contrast
- image segmentation
- denoising algorithm
- transformed image
- image matching
- image analysis
- image features
- median filtering
- pixel intensities
- edge detection
- information security
- region of interest
- morphological filters
- noise free
- geometric distortions
- noise level
- segmentation method
- imaging process
- test images
- medical images
- image pixels
- intensity variations
- image regions