Hey buddy i want a project based on JAVA on "Digital Water Marking".
Waiting for ur reply...........
Digital watermark is a special message embedded in an image, whether it is a photo, video or
other digital content. A digital watermark software
embeds these "imperceptible" messages by making
subtle changes to the data of the original digital content and it can be "read" to validate
original content. It thus provides an imperceptoble way to embed information in both digital and conventional media content. Watermarking systems must include the following attributes:
-robustness against distortion and attack
-visibility of the water mark
-data capacity of the watermark
Digital Watermarking can be used for applications such as:
- Copyright protection
-Covert Communication (steganography)
Watermarking life-cycle phases
The information to be embedded is called a digital watermark, The signal where the watermark is to be embedded is called the host signal.embedding, attack and detection. are the three steps. In embedding, an algorithm accepts the host and the data to be embedded and produces a watermarked signal. The watermarked signal is then transmitted or stored. If the reciever makes a modification, this is called an attack. In the ATTACK,the pirates attempt to remove the digital watermark through modification through methods like lossy compression of the data, cropping an image or video, or intentionally adding noise. Detection (often called extraction) is an algorithm which is applied to the attacked signal to attempt to extract the watermark from it. The watermark is still present and it can be extracted, If the signal was unmodified during transmission.
A watermarking method is referred to as spread-spectrum if the marked signal is obtained by an additive modification. It has low information capacity due to host interference. A watermarking method is said to be of quantization type if the marked signal is obtained by quantization. This method shows low robustness, but have a high information capacity . A watermarking method is referred to as amplitude modulation if the marked signal is embedded by additive modification which is similar to spread spectrum method but is particularly embedded in the spatial domain.
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i have more information about digital watermarking
i am not satisified with this information
hey ashmi ,
if you have .. please share it here ..
What is Digital Watermarking?
Digital watermarking technology allows users to embed
data into digital contents such as text, images, video and audio data.
It is the process of Information hiding.
The hiding process has to be such that the modifications of the media are imperceptible.
.Digital Watermarking Techniques Can be Classified in Several Ways As follows:
Fragile: it fails to be detected after the Slightest modification.
Semi-fragile: it fails detection after big transformation
Robust: it resists a designated class of transformation
There are basically five types of watermarking
- Change the original image in such way that the new signals can easily differentiated .
- Used as Marketing tool.
- Original image can not be Changed.
Fig2.image with invisible watermark
The Original text are replaced with its synonyms .
Watermarking is done in such way that pixels of image will changed.
It can be visible or invisible .
Invisible marking on blank paper:
It is used to embed the name of the lawyer or important information
Fig4. The image on the left shows blank paper marked by the invisible digital watermark.
A watermark is placed in a music document to declare who owns the music.
To control accessing and copying music.