DCT block location based data hiding

Abstract

In recent literature, it has been found that, the visual quality of the watermarked image is evaluated with respect to the human visual system. In this paper, the effect of perturbation in the different position in the quantized 8×8 DCT coefficient block is analyzed in order to find suitable image independent block positions for embedding data with respect to the total perceptual error between cover and watermarked image. The JPEG domain data hiding using quantization index modulation (QIM) [7] is used for embedding. A set of experiments have been carried out to justify the applicability of the proposed analysis.