International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
A Simple Approach to Watermarking of Multiple Grayscale Images using Alpha Blending Anirban Patra1, Dr. Arijit Saha2, Dr Ajay Kumar Chakraborty3 1Assistant 2Associate
Professor , Dept. of ECE, JIS College of Engineering, Kalyani, West Bengal, India
Professor , Dept. of ECE, B P Poddar Institute of Engineering and Management, West Bengal, India Professor , Dept. of ECE, Institute of Engineering and Management, West Bengal, India
3
--------------------------------------------------------------------***--------------------------------------------------------------------Abstract : Watermarking is a technique very often used
they have used a technique where a multi-bit
in image processing for copyright purpose, where a
watermark is embedded into the low frequency
special image is superimposed on another image.
sub-band of a cover image by using alpha
Watermarking of images and then retrieve the original
blending
image from the watermarked image is an application in
watermark image is dispersed within the
image processing. Various methods can be utilized for
original image depending upon the scaling
watermarking of images. In this paper, a new technique
factor of alpha blending technique. [1] A P Singh
for Watermarking of images has been proposed. Images
et al proposed an idea where they have also
are first watermarked with different values of alpha
used discrete wavelet transform but in a
blending. The resulting image contains the watermarked
simplified manner using various values of
information of all images. Theoretically a multiple
PSNR’s and MSE’s. [2] R V Totla and K S Bapat
images can be watermarked by this system, however to
used both discrete cosine transform and
get a reasonably good output, we have worked with only
discrete wavelet transform for watermarking .
three images. Using proper value of alpha, original
They have described imperceptibility &
image can be retrieved from the watermarked image.
robustness of the both algorithms and make a
This scheme is suitable for both visible as well as invisible
comparative study on both of them. [3] G Kaur
watermarking. This technique can be used for image
et al have discussed least significant bit for
steganography also.
image watermarking in their technique. They
technique.
During
embedding,
have applied this technique in spatial domain only. Their technique is simple but is not
Keywords : Image transform, alpha blending,
applicable in frequency domain. [4] Asha N and
digital watermarking, image security
Bhagya P described a new technique of watermarking using alpha blending and three level
1. INTRODUCTION : There are many techniques
discrete
wavelet
transform
for
used for Watermarking of images. P Sharma
watermarking. According to their theory, a
and S Swami used three level discrete wavelet
multibit watermarking technique is used into
transform for watermarking. In their method,
low frequency sub band of cover image by
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