Talk:Digital watermarking

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[edit] Inadequate

This page in the form of a couple of days ago is totally inadequate. It lacked (1) a proper definition of the main topic of this page, (2) a generally accepted classification, and (3) a statement of the most relevant results (e.g. Costa). Moreover, its references were mostly obscure articles. A major re-edit is needed (started). —Preceding unsigned comment added by Drkbts (talk • contribs) 05:30, 20 March 2008 (UTC)

[edit] Watermarking vs Steganography

Watermarking is not a form of steganography. mahendra kumar dewangan

Watermarking has the objective to embed data in a document in a way, so that it:

  • is hard to remove
  • cannot be forged by someone else

In general it is not necessary that the watermark can not be detected. In contrary the goal of steganography is to hide data undetectable in a document.

It is also used for the purposes of Digital Rights Managment. Uniquely identifiable data is put into a file to implement DRM. Wageslave 20:24, 4 June 2007 (UTC)

-- LicklStefan 09:24, 13 Jun 2005 (UTC)

There are many ways to make the spatial watermarking robust to cropping or translation. In fact, there are really no differences between adding something in the frequency domain over adding something in the space domain.

[edit] remove line about picture above

There is no picture referance should be removed or picture added.

[edit] Wikipedia

Are images with digital watermarking generally not allowed on Wikipedia? Shawnc 02:10, 10 July 2006 (UTC)

If you mean those visible notices, generally they're against Wikipedia style, though maybe they occur in some fair-use images where they mustn't be removed. Phr (talk) 17:11, 11 July 2006 (UTC)

[edit] Additions to history section

All but the first paragraph of the history section seems either misplaced or completely irrelevant--128.154.44.44 13:32, 25 July 2006 (UTC)

[edit] The coneption in the article seems somewhat narrow =

According to Cox, Miller, Bloom in "Digital Watermarking" applications include broadcast monitoring, owner identification, proof of ownership, transaction tracking, content authentication, copy control and device control. The article only seems to focus on authentication. MatthewKarlsen 17:47, 18 September 2006 (UTC)

[edit] Page issues

Alright, so.. this page suffers heavily from a number of issues, including direct quotation and single sourcing.

"A simple example of a digital watermark would be a visible "seal" placed over an image to identify the copyright. However the watermark might contain additional information including the identity of the purchaser of a particular copy of the material. According to the human perception, the digital watermarks can be divided into two different types as follows: visible and invisible. Visible watermark is a secondary translucent overlaid into the primary image as shown in the figure." is taken from [1], page 4. The spacing here (you may need to edit this page) is identical to what would happen if you copied it directly from the PDF.

"There are various spatial and frequency domain techniques used for adding watermarks to and removing them from signals. Purely spatial techniques are not robust to some attacks to the signal like cropping and zooming, whereas most frequency domain techniques and mixed-domain techniques are quite robust to such attacks." - This was stolen directly from [2], page 17. Kiranmayi Penumarthi is not quoted on this page.

"Another application is to protect digital media by fingerprinting each copy with the purchaser's information. If the purchaser makes illegitimate copies, these will contain his name. Fingerprints are an extension to watermarking principle and can be both visible and invisible." is from [3], page 7.

I'm going to ask around for some help in how to solve this problem, as I don't quite have the time or effort to put into this. — HelloAnnyong [ t · c ] 13:40, 1 November 2007 (UTC)

Since they copyvios have been integrated into the text, it's nearly impossible to remove them so I've reduced it to what seems to be non-copyvio material. If someone can find a good version in the history to revert back to, that would work also. John Reaves 22:17, 12 December 2007 (UTC)
If the telltale signs of this copyvio are so hard to remove, perhaps we could argue that it is fair use to keep them in as the perfect example of digital watermarking! Certes (talk) 00:50, 6 February 2008 (UTC)

On a less frivolous note, this page has become a magnet for linkspam. I've just removed three specimens but I doubt they'll be the last. Certes (talk) 23:16, 12 February 2008 (UTC)