Improved Data Hiding Method Based on Use of Edge Line Distortion Score

This paper by considering objective distortion measure into a data hiding method makes a little improvement to it. The distortion measure considers not only how many pixels are changed but also where the pixels are changed and how the flipping affects the overall shape formed by the edge line. The data hiding method uses a secret key and a weight matrix to protect the hidden data and ensures that in each m × n image block of the host image as many as ( )   1 1 log2 − + mn bits can be hidden in the block by changing at most 2 bits in the block. In this paper we propose a revised scheme that by using of edge line distortion score can maintain a little higher quality of the host image without any reduction in capacity. Experimental results and Comparisons show increasing quality of the image.