Securing display of grayscale and multicolored images by use of visual cryptography.
Hirotsugu YamamotoYoshio HayasakiNobuo NishidaPublished in: Security, Steganography, and Watermarking of Multimedia Contents (2004)
Keyphrases
- gray scale
- halftone images
- camera captured document
- input image
- color images
- image analysis
- grayscale images
- visual cryptography
- object recognition
- image data
- ground truth
- binary images
- multiple images
- inverse halftoning
- original images
- test images
- secret image
- human eyes
- gray level
- edge detection
- image processing
- natural images
- region detection
- face images
- data hiding
- error diffusion
- document images