A Grayscale Image Steganography Based upon Discrete Cosine Transformation

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 signifi cant information of each DCT secret block can be embedded into the non-signifi cant 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 HVS-Based image hiding schemes in terms of the image quality of the stego image and the extracted secret image.