Self embedding technique for digital color image authentication and security

2007 ◽  
Author(s):  
S. Shefali ◽  
S.M. Deshapande
Keyword(s):  
Color Image ◽  
Image Authentication ◽  
Embedding Technique ◽  
Authentication And Security

scholarly journals A Watermarking Method for Selective Image Authentication Tollerant to JPEG Compression, Brightness and Contrast Adjustments

2020 ◽  
Vol 6 (3) ◽  
pp. 92-99
Author(s):  
A. Zhuvikin
Keyword(s):  
Wavelet Transform ◽  
Digital Watermarking ◽  
Visual Quality ◽  
Image Authentication ◽  
Jpeg Compression ◽  
Discrete Wavelet ◽  
Embedding Capacity ◽  
Image Histogram ◽  
Embedding Technique ◽  
Promising Application

One of the most promising application of the digital watermarking is the selective image authentication (SIA) systems. In order to implement such a system one requires an embedding algorithm with an appropriate capacity. In addition, an embedding method is to be robust for the class of non-malicious manipulations which the SIA system is designed for. We propose the new method which has a significant embedding capacity while still being tolerant to JPEG compression, brightness and contrast adjustments. This was possible due to the extension of the well-known discrete wavelet transform embedding technique. We propose two-step embedding scheme and the use of image histogram equalisation and recovering operations. The experiment results show acceptable tolerance to JPEG compression, brightness and contrast adjustments with good visual quality in terms of PSNR just after embedding.

A Color Image Authentication System

2013 ◽  
Vol 380-384 ◽  
pp. 2925-2929
Author(s):  
Yue Rong Lei ◽  
Xu Zhan ◽  
Ling Yan Du ◽  
Hui Ming Zeng ◽  
Jian Ling Chen
Keyword(s):  
Color Image ◽  
Image Authentication ◽  
Grayscale Image ◽  
Authentication Code ◽  
Low Frequencies ◽  
Dct Transform ◽  
Hash Algorithm ◽  
Authentication System ◽  
Illegal Copying ◽  
Embed Watermark

Image authentication has achieved a sharp attention now a day due to broad availability of internet services. Maldistribution and illegal copying of image volatiles the authenticity of image-ownership. In this regard the digital watermarking-based image authentication system is studied. A color image authentication system is proposed. This system converts a color image into a grayscale image, and divides the grayscale image into 8*8 small pieces. Each small piece is made into DCT transform and extracted low frequencies to form the watermark. Then, the original image uses LSB algorithm and hash algorithm in watermark image to form authentication code. The system makes the authentication code as watermark information to embed watermark. The system is made in experiment. The result shows the system has good imperceptibility.

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