DCT based Steganographic Evaluation parameter analysis inFrequency domain by using modified JPEG luminanceQuantization Table
Journal Title: IOSR Journals (IOSR Journal of Computer Engineering) - Year 2015, Vol 17, Issue 1
Abstract
Abstract : Steganography is the process of hiding one file inside another such that others can neither identifythe meaning of the embedded object, nor even recognize its existence. In this paper we want to increase thecapacity and performance of DCT based steganography by using modified JPEG quantization table embeddingtechnique in frequency domain. Our experimental results show that the proposed method will provide a betterresult in terms of some evaluation criteria named Peak Signal to noise ratio, square of error between cover &stego image, maximum no of bits that can be embedded in a cover image with a negligible probability ofdetection by an adversary of steganography system. Our proposed method shows that after modification offrequency values in default JPEG quantization table we can be able to increase the image quality by increasingthe value of Peak signal to noise ratio, capacity and also by decreasing mean square error of embedded image.So that’s why when we try to extract hidden data from stego image in receiving end we just get almost exacthidden data with less error possibilities. In our proposed method we first create modified default (8x8)quantization table from default 8X8 traditional JPEG quantization table and then by using the table we can also try to modify embedding as well as extracting algorithm in frequency domain steganography. It has been foundthat capacity which is the amount of information embedding in color images increases as the number ofmodified quantized DCT coefficients increases. So more data can be embedded in this innovative approach.
Authors and Affiliations
Sourish Mitra , Moloy Dhar , Ankur Mondal , Nirupam Saha , Rafiqul Islam
Keywords
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