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Frequently Asked Questions

What is the difference between visible and invisible watermarking ?

Digital Watermarking World: FAQ
Visibility is a term associated with the perception of the human eye. A watermarked image in which the watermark is imperceptible, or the watermarked image is visually identical to its orginal constitutes a invisible watermarking. Examples include images distrubuted over internet with watermarks embedded in them for copyright protection. Those which fail can be classified as visible watermarks. Examples include logos used in papers in currencies.
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What is the difference between visible red lasers and invisible, infrared lasers?

Sun Valley Laser Therapy - Frequently Asked Questions
Red (visible) light produces chemical changes in molecules and penetrates the skin poorly. This makes visible red light more suitable for superficial (skin and mucosal) lesions, and superficial muscle and connective tissue injuries. Infrared light produces physical changes in molecules and penetrates deeper into tissues. It is suitable for both superficial and deeper lesions.
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What are the differences between encryption, visible watermarking and invisible watermarking?

Digital Watermarking from Signum Technologies
Whilst these are all security devices for digital material and the terms are frequently used interchangeably, they are nevertheless three distinctly different protection methods. Encryption works by locking an object file with a 'key' and providing that key only to authorised users.
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What is the difference between HeNe (visible red) LASERS and invisible, infrared lasers?

Frequently Asked Questions
HeNe lasers penetrate the skin poorly, therefore are more suitable for superficial (skin and mucosal) lesions, superficial muscle and connective tissue injuries. Infrared lasers, such as the BioFlex System penetrate deeper and are suitable for both superficial and deeper lesions.
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Where is a type parameter visible (or invisible)?

Java Generics FAQs - Frequently Asked Questions
Can I use a type parameter as part of its own bounds or in the declaration of other type parameters? Static Context
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QUESTION: What's the difference between a 'visible' disability and invisible disability?

Empowerment Therapy FAQ
ANSWER: While the answer to this question may seem quite obvious, the complexities due to the ramifications of this issue can be extremely difficult to deal with. A 'visible' disability is one that another can see based on the disabled person's appearance and/or behavior. It is quite obvious that a person is blind and/or visually impaired when another sees that person walking down the street using a white cane.
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What is the difference between watermarking, steganography, and cryptography ?

Digital Watermarking World: FAQ
While cryptography is about protecting the content of messages (their meaning), steganography is about concealing their very existence. It comes from Greek roots, literally means 'covered writing', and is usually interpreted to mean hiding information in other information. Examples include sending a message to a spy by marking certain letters in a newspaper using invisible ink, and adding sub-perceptible echo at certain places in an audio recording.
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How do I make the scroll bar of my pages visible/invisible?

Dreamweaver FAQ
Note: The property inspector will now change to a "frame property inspector" and has attributes such as Margins, borders, border color, and scrolling. Select "Yes" to make a scroll bar appear and "No" to make the scroll bar disappear
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What is Watermarking?

Surround FAQ
Watermarking is an embedded signal that applies a digital signature in the form of noise (supposedly inaudible) on a DVD-A. This digital watermark actually puts a faint image (either text or graphics) on the signal side of the disc which makes it extremely hard for pirates to duplicate. The watermark also identifies the artist, record company, catalog number and copyright holder. In some cases yes, in some cases no.
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Will there be visible scars?

Asian Eyelid - Frequently Asked Questions
Most of the time there is no visible scar after the healing is complete. With the laser/cutting technique, the skin is cut with a radio frequency device, to eliminate the chance that the laser could scar the skin. Then only the deeper layers are cut with the laser. The incision is hidden deep inside the crease. If you have a history of abnormal scarring, there are medications that can be used to help prevent excess scarring.
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Will there be a visible difference if I stay on Propecia?

Propecia Frequently Asked Questions - FAQ's
expert panel of dermatologists determined that 90% (251 out of 279) of men on Propecia at 5 years had improvement or no visible hair loss vs 25% (4 out of 16) on placebo (sugar pill) - 9 out of 10 patients on Propecia had visible results (maintenance or improvement) according to photographic assessments by an independent panel of dermatologists.
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What if my paint fades and I take the film off? Will there be a visible difference?

OZICOZI Paint Protection Film - Film Data - FAQ - OZICOZI
Even though the film has a structure that stops it from being affected by UV, it will allow UV to pass through it and therefore paint that is protected should fade at the same rate as unprotected paint. However, we cannot guarantee the standard of the original paintwork, or the conditions in which the car is stored, or the type and amount of maintenance that happens to the car's paintwork, therefore we cannot guarantee that your paint will not fade at different rates.
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What is the difference between visible and active in the layer list?

My Neighborhood GIS Application - FAQs
Visible means the GIS layer is visible on the map. Active means the user can perform geo-spatial analysis and search queries for the current layer. A layer must be visible before it can be made active.
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What is watermarking? What is a digital watermark?

SDMI Challenge FAQ
A digital watermark is an imperceptible signal hidden in an audio clip, or an image, or any other object of value. The hidden signal is intended to communicate information about the marked object. There are many applications of watermarking. In the context of SDMI, the application is screening and piracy prevention: an audio clip with a watermark is recognized as copyrighted, warning a portable device that it should not be recorded (or possibly even played) except under specific conditions.
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What were the two non-watermarking challenges?

SDMI Challenge FAQ
We will discuss these in detail in our upcoming technical report. Briefly, challenge D concerned a method for preventing people from ripping tracks from a CD, unless that CD has a signature on it marking the CD as original. Thus, as far as we can tell, this is intended to allow you to make mix CDs and MP3s from your original CDs, but not permit you to make mixes and MP3s from other mix CDs or pirated CDs.
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What is software watermarking?

Java and .NET Obfuscation Frequently Asked Questions
Software watermarking is used to hide customer identification or copyright information within software applications, in the same fashion that digital content providers protect songs, movies and images. A watermark is used to identify owners of the software or to stealthily identify the origin of a pirated copy. TOP
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Is it really invisible?

Benner's Gardens: Question & Answers
From 15’ away you’ll hardly know a fence is there - especially if there are trees or other plants and shrubs in the area. Black is the least visible color for a material such as ours, and it really blends in with the shadows produced outdoors in the landscape. The fencing is UV stabilized to withstand the radiation from the sun and it has been installed for over ten years in all different types of climates from Alaska to Hawaii with little to no breakdown.
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Why not replace blocked banners with something invisible?

Internet Junkbuster Frequently Asked Questions
Many users have suggested to us that blocked banners should be replaced by a something like a 1x1 transparent GIF to make the page would look as if there was nothing ever there. Apart from making it harder to catch unintended blocking, this might also displease the owners of the page, who could argue that such a change constitutes a copyright infringement.
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Should the top of my well be visible?

Air Rock Drilling - FAQ
A well must always be visible to ensure easy access if remedial work to the pump, or other emergency work, must be done immediately. You should determine the exact location of the well if you do not already know where it is. This will help when you need to replace any pumping or other equipment. It is advisable to have the casing raised to a minimum height of 40 cm above the ground surface.
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What is video watermarking ?

Digital Watermarking World: FAQ
A very simple defintion of video watermarking would be, ''The process of watermarking the sequence of video frames''. There are several avenues in case of video to watermark. One can watermark the raw frame data, or the compressed data, where watermarking the later is more challenging.
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What is audio watermarking ?

Digital Watermarking World: FAQ
Audio, like any other data, constitutes a carrier for physo-acoustically hidden data. Thus the process of embedding information into audio can be termed as audio watermarking.
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What is text watermarking ?

Digital Watermarking World: FAQ
Watermarking Document Images with Bounding Box Expansion'', Jack Brassil and Larry O'Gorman Information Hiding 1st International Workshop, June 1996 Marking and Detection of Text Documents Using Transform-domain Techniques'', Yong Liu, Jonathon, Edward Wong, Steven Low Security and watermarking of Multimedia Contents, january 1999 Document Image Data Hiding Technique Using Character Spacing With Sequence Coding'', Nopporn Chotikakamthorn ICIP'99
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