A Grayscale Image Steganography Based upon Discrete Cosine Transformation
Chin-Chen Chang, Pei-Yu Lin, and Jun-Chou Chuang
Journal of Digital Information Management, Vol. 8, No. 2, 2010.
DOI: 
Link: http://www.dline.info/fpaper/jdim/v8i2/3.pdf
Abstract:
In this paper, a simple image steganography for secure communication is proposed. Our scheme is based on the discrete cosine transformation (DCT) technique. By using DCT, the most significant information of each DCT secret block can be embedded into the non-significant parts of each DCT cover block. To improve the image quality of the cover image, a quantization factor is used. According to our experiments, the proposed method outperforms the VQ-Based and the HVSBased image hiding schemes in terms of the image quality of the stego image and the extracted secret image.