Embedded Files
Digital watermarking:
Digital watermarking is a marker that is embedded in media like audio, video, music. which is used to identify original owner of that particular media.
In physical assets, we can know the manufacturer of the product, it is imprinted on the product and we can file a patent on the product, which can be useful to avoid duplication of the original product.
But in the case digital assets like media, It can be easily copied and use individually, to avoid this they introduced digital watermarking
"Watermarking" is the process of hiding digital information in a carrier signal. Digital watermarks may be used to verify the authenticity or integrity of the carrier signal or to show the identity of its owners. It is actually used for tracing copyright infringements.
"Physical Watermarks" are can be visible to users, these are visible behind the text in watermarked articles and reports.
These are used in olden days, and some companies print their watermarks in their products to recall its brand.
In digital watermarking had two main components
->Encoder
->Decoder
To encode a media with watermark , we will require the following things(Image):
1.Image(c)
2.Watermark signal(w)
3.Security key(k)
4.Encoding algorithm(e)
The combination all these, we can make digitally watermarked image(wc)
wc=e(c,w,k)
To decode the watermark(extract/decoder), contain two step process in which first step:
It applies some algorithms to detect sequence of carrier signal, which is called detected watermarks.
In second process,
it extract watermark from the original media by comparison & analysis of watermark with original, It represented as follows
w=d(c, k....)
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