Data hiding method in adaptive lossless coding scheme

Abstract

Data hiding method called steganography has bee studied. Steganography is a method to transmit noticeable data secretly by mixing them in carefree image data. In the steganography, an image is used only as the cloak to transmit noticeable information. In this summary, we propose a method to incorporate data hiding into an adaptive lossless coding method. An adaptive coding method is effective for data compression because image signals are usually not stationary. For example, it is possible to get better coding performance by dividing an image into some blocks and by using suitable coding parameter for each block. There are two types of adaptive coding schemes, one is the method to transmit suitable coding parameters, block by block, as an overhead information, and another is the method to estimate and use parameters from already transmitted data, so that the latter does not need to transmit the coding parameters. We propose the method for data hiding in the former adaptive coding method, i.e. adaptive method with overhead information. In our proposed method, coding parameters are controlled by the embedding data and the original image data are never changed.