what does watermarking have to do with information hiding
Watermarking is a technique used in information hiding to embed a visible or invisible pattern within digital media (such as images, videos, or audio) in order to authenticate or protect the copyright of the content. It helps to prove the ownership or authorship of the content and provides a way to trace the source if the content is misused or distributed without proper permission.
In information hiding, watermarking can be used for both visible and invisible purposes. Visible watermarks are typically logo or text overlays that are easily noticeable and serve as a deterrent against unauthorized usage. On the other hand, invisible watermarks are embedded within the content in such a way that they are not perceivable by human senses but can be detected and extracted using specialized algorithms or techniques.
By embedding watermarks within digital media, information hiding techniques aim to ensure the integrity, authenticity, and provenance of the content. Watermarking becomes a crucial component in cases where unauthorized distribution or illegal copying of digital media can occur, such as in the case of copyrighted material or sensitive digital documents.
Watermarking is a technique used in information hiding to embed or hide additional information within a digital signal, such as an image, audio, or video file. The purpose of watermarking is typically to verify the authenticity or ownership of the content, and it is often used to deter or detect unauthorized copying or distribution.
In the context of information hiding, watermarking involves modifying the host signal in a specific way to embed the concealed information without significantly altering the perceptual quality of the original content. This can be achieved by manipulating the host signal using techniques like spread spectrum modulation, least significant bit (LSB) replacement, or frequency domain transformations.
The hidden information, known as the watermark, can be a digital signature, copyright notice, or any other identifying information that is embedded within the host signal. The watermark is usually imperceptible to the human observer, but can be reliably extracted using appropriate techniques.
Overall, watermarking is a crucial aspect of information hiding as it allows for the concealment of additional information within a digital signal without raising suspicion or altering the perceptual quality of the original content.