Improving the F5 Steganography Method through Shrinkage Mapping

There are a lot of methods for embedding hidden information in JPEG format but no method have been presented so far with a high capacity and same accuracy. The loss of JPEG compression and the effects of such compression on the images have prevented the location area from being easily used for embedding and most of the methods apply the DCT coefficients of JPEG algorithm for this aspect. This paper il lustrates the shrinkage phenomenon which happens during F5 embedding process. It also shows all of the effects of shrinkage on F5 algorithm and presents a new F5 model based on the original method in order to reduce the shrinkage rate. The suggested method controlled the shrinkage rate by making a shrinkage map. Afterward, a comparison would be performed between the suggested method and the common F5me. Of course, considering the main factors of steganography such as embedding capacity and image quality, it indicates how the suggested method provides more capacity for embedding and preserves the image quality.