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Achieving enhanced perceptual quality of stego-images for secure multimedia transmission

Singh H. V., Singh A. K., Balasubramanian S. K., Mohan A.

Image Processing & Communications

2007

Vol. 12, no 1

47-52

This paper discusses a new method of hiding ASCII characters into still cover image. It is based on finding match between the bit of the randomly selected image pixel and the data bits. Higher nibbles are used for data hiding at a position indicated in the lower nibble using a 2-bit code word. Simulation results on IEEE standard Lena image hiding 800 ASCII text characters are given. It is shown that the proposed technique achieves up to 44.7 dB PSNR as against minimum required value of 35 dB for acceptable perceptual quality along with the bounds of the change in the original pixel value in the range ۭ. Therefore the proposed method retains enhanced perceptual quality of the original cover image in spite of hiding large number of text characters and offers high robustness as compared to the LSB insertion technique [1, 2]. In addition it is less prone to attacks by eaves droppers and therefore it can be effectively used for secure multimedia transmissions.