Optimization of perceptual steganography capacity using the human visual system and evolutionary computation
Raniyah Wazirali · UTS ePRESS (University of Technology Sydney) · 2016
wPSNR Weighted Peak Signal to Noise Ratio vi Terms and Definitions• Steganography is the science of concealing information within another non-secret information in an invisible way.It is derived from the Greek "steganos", meaning "covered".Graphos is also Greek meaning "writing".Steganography mainly aims to hide the presence of the message.• Steganoalysis is the science of detecting hidden message using steganography.• Watermarking is a pattern of bits inserted into a digital image, audio or video file that identifies the file's copyright information (author, rights, etc.).• Cryptography is the science of transforming information into an unreadable format.• Embedding/Insertion is the process of mapping one file into another.• Extracting is the process of obtaining the hidden message.• Cover-image/carrier is the name of the original file that used to hide the message inside it.• Stego-image is the name of the file after the embedding process.The cover image and the stego image must be identical.• Multi-dimensional media is the integration of several types of media into one.• Encapsulation is the process of packing multi-media into a single media.• Imperceptibility is the quality of non perceptibility of the hidden file.• Capacity is the number of allowable bits which can be inserted safely without any visible or statistical degradation.vii• Secret Message is the name of the file or information that is hidden from general view.• Metadata is a set of data that gives details about other data.• Optimization is the process of enhancing and improving the stored results as best possible.• Fitness Function is an objective measure of how close one is to a given solution.• Perception is the ability of noticing something through the senses.