Digital Watermarking Under DCT Domain According to Image Types

Abstract

The massive development of information hiding and data security consists of several and communications technology has made it difficult to maintain the security and confidentiality of information, it is necessary to find new ways through which information can be preserved in a safe manner that enables users to retrieve it later and exchange information at any time. Information hiding is one of the most common and important techniques to use to achieve security and data confidentiality. Moreover; with the different multimedia it has no way to deal with it in the process of data concealment. Our proposed method aimed to hide the binary image bits inside the transformed image under DCT, after converting these coefficients from decimal to the binary form taking into consideration the type of image. The image type is defined by using the fuzzy c-men function, If the image is gray, then the optimal hiding site is block (32) that will used to hide the binary bits for the logo, each binary bits will be exchanging with the corresponding bit of the host under DCT domain, otherwise, if the host is color image, then the optimal hiding site is block (1) that will used to hide the binary bits for the logo, each binary bits will be exchanging with the corresponding bit of the host under DCT domain. The results has approved that our proposed method has ability and flexibility in dealing with different types of images while preserving the quality of the image after the concealment process, the proposed method has the ability to retrieve the binary image with the diaper on the quality and also the resulting image after the concealment is a high-quality image, the security aspect of the proposed method good and safe Because we do not deal with all the images in the same style of concealment, but the contrast is clear from the color image to the gray image as each image has a special place to hide.