01-06-2013, 03:09 PM
IMAGE AUTHENTICATION
IMAGE AUTHENTICATION.pptx (Size: 1.12 MB / Downloads: 28)
WHAT IS DIGITALWATERMARK?
A Digital Watermark is a digital signal or pattern inserted into a digital image
The digital Watermark may also serve as a digital signature for the copies
REQUIREMENTS OF WATERMARK
The Watermark must be difficult or impossible to remove
An invisible Watermark should be imperceptible
The Watermark must survive image modifications
WATERMARKING A STILL IMAGE
The important steps in watermarking an image are:
1.Embedding the Watermark
2.Attacking the Watermarked image to test efficiency
3.Extraction of the Watermark
SPATIAL DOMAIN
Several different methods enable Watermarking in the spatial -domain
The simplest is to just flip the lowest-order bit of chosen pixels in color image
This will work well only if the image will not be subject to any human or noisy modification
FOR HIGH LEVEL SECURITY
The watermark embedding process should occur on the spot
The owner should have a database of watermarks and there should be a key in selection of the watermarks
There should be a MOBILE AGENT to watch which user has been accessing your website and that address should be added in the database
So hacking is 99.9999% impossible
ADVANTAGES OF DIGITAL WATER MARKING
Since we are making use of frequency domain, it takes much time for a hacker to find the particular frequency that we used in embedding.
Even if he is making a trial and error method to find the frequency with the downloaded images of same picture at different times, he can’t - since the frequency and watermarks vary each time for same image.
Since the owner is having a mobile agent, he can easily identify the wrong person
CONCLUSION
A robust and transparent Digital Watermarking for image copyright protection has been developed in this work.
The methods explained in this paper are by considering the texture of the image , these methods are robust and provide high imperceptibility
As a final word to say
“Security (success) is a journey, never a destination “
IMAGE AUTHENTICATION.pptx (Size: 1.12 MB / Downloads: 28)
WHAT IS DIGITALWATERMARK?
A Digital Watermark is a digital signal or pattern inserted into a digital image
The digital Watermark may also serve as a digital signature for the copies
REQUIREMENTS OF WATERMARK
The Watermark must be difficult or impossible to remove
An invisible Watermark should be imperceptible
The Watermark must survive image modifications
WATERMARKING A STILL IMAGE
The important steps in watermarking an image are:
1.Embedding the Watermark
2.Attacking the Watermarked image to test efficiency
3.Extraction of the Watermark
SPATIAL DOMAIN
Several different methods enable Watermarking in the spatial -domain
The simplest is to just flip the lowest-order bit of chosen pixels in color image
This will work well only if the image will not be subject to any human or noisy modification
FOR HIGH LEVEL SECURITY
The watermark embedding process should occur on the spot
The owner should have a database of watermarks and there should be a key in selection of the watermarks
There should be a MOBILE AGENT to watch which user has been accessing your website and that address should be added in the database
So hacking is 99.9999% impossible
ADVANTAGES OF DIGITAL WATER MARKING
Since we are making use of frequency domain, it takes much time for a hacker to find the particular frequency that we used in embedding.
Even if he is making a trial and error method to find the frequency with the downloaded images of same picture at different times, he can’t - since the frequency and watermarks vary each time for same image.
Since the owner is having a mobile agent, he can easily identify the wrong person
CONCLUSION
A robust and transparent Digital Watermarking for image copyright protection has been developed in this work.
The methods explained in this paper are by considering the texture of the image , these methods are robust and provide high imperceptibility
As a final word to say
“Security (success) is a journey, never a destination “