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Friday

SIMULATION MODEL OF VISIBLE WATERMARKING FOR JPEG IMAGE (3 D) USING VLSI/MATLAB

Watermarking is the process that embeds data called a watermark, a tag, or a label into a multimedia object, such as images, video, or text, for their copyright protection. According to human perception, the digital watermarks can either be visible or invisible. A visible watermark is a secondary translucent image overlaid into the primary image and appears visible to a viewer on a careful inspection. The invisible watermark is embedded in such a way that the modifications made to the pixel value is perceptually not noticed, and it can be recovered only with an appropriate decoding mechanism. This project presents a new very large scale integration (VLSI) architecture for implementing two visible digital image watermarking schemes. The proposed architecture is designed to aim at easy integration into any existing digital camera framework.

Two fundamental operations performed by a digital camera are image capturing and storing. The images are subsequently transmitted in various forms over appropriate media. These images are always vulnerable to various forms of copyright attacks and ownership issues. The watermarking object may be an image, audio, video, or text .Whether the host data is in spatial domain, discrete cosine-transformed, or wavelet-transformed, watermarks of varying degree of visibility are added to present media as a guarantee of authenticity, ownership, source, and copyright protection.

According to human perception, the digital watermarks can be divided into four categories:

1) visible;

2) invisible-robust;

3) invisible-fragile;

4) dual

A visible watermark is a secondary translucent image overlaid into the primary image and appears visible to a casual viewer on careful inspection. The invisible-robust watermark is embedded in such a way that modifications made to the pixel value is perceptually not noticed, and it can be recovered only with appropriate decoding mechanism. The invisible-fragile watermark is embedded in such a way that any manipulation or modification of the image would alter or destroy the watermark. A dual watermark is a combination of a visible and an invisible watermark . In this type of watermark, an invisible watermark is used as a back-up for the visible watermark. There are numerous software-based watermarking schemes available in literature. A vast research community involving experts from computer science, cryptography, signal processing, and communications, etc., are working together to develop watermarks that can withstand different possible forms of attacks, each one of which has its own applications and thus is equally important. There is a gap between the image capture and image transmission in thewaywatermarking is used presently. Once the images are acquired,watermarks are inserted in them offline, and then images are made available. The objective of this research work is to implement hardware-based watermarking schemes so as to bridge that gap. The watermark chip will be fitted in the devices that acquire the image and watermark the images in real time while capturing.

VIDEO DEMO

1 comment:

custom essay said...

This watermarking technology is certainly used some visible and invisible scheme.