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A data hiding scheme with flexible hiding capacity applied in vector quantization (VQ) index tables was proposed by Chang et al. However the minimum bit rate of their scheme is 0.552. To improve the bit rate of Chang et al's method, this paper proposes a novel and efficient reversible data embedding scheme for VQ index tables. The proposed method exploits characteristics of VQ indices and uses two...
Wet paper coding is a technique that can be used to embed secrets into some specific pixels, called dry pixels, of a digital image. The fully exploiting modifications method (FEM) is a method applied to convey secrets securely from senders to receivers using a stego-image that is slightly modified from the original digital image. Based on FEM, before embedding, we randomly choose pixels in the image...
In this paper, we propose an information hiding scheme to embed secret information into the compression code of an index table. First, the codewords neighboring the current processed index along with their closest codewords form a state codebook. Two indices of the state codebook are reserved as indicators. Once the current processed index satisfies some pre-defined conditions, the current processed...
In this paper, we propose a simple reversible data hiding method in spatial domain for digital images by exploiting the correlation characteristic of neighboring pixels in natural images. The proposed method embeds several secret bits into a block of two consecutive cover pixels whose values are equal. The experimental results show that the proposed method achieves very good visual quality at low...
This paper proposes a novel data embedding method for embedding secrets into VQ indices by using the Chinese Remainder Theorem (CRT). In the experimental results, the hiding capacity is flexible which corresponds to the pre-defined prime parameters. In addition, a reversible mechanism is imported into the scheme so the original VQ indices can be restored after extracting secrets retrieval.
A new fragile watermarking scheme for image authentication and location of areas that have been tampered with is proposed in this paper. Based on a quadratic-residue theorem, the proposed scheme generates the watermark block-by-block in the cover image. To improve security by preventing malicious attacks, such as the vector quantization attack, a pseudo-random number generator using a private key...
This paper proposes an information hiding method based on block-segmentation strategy. The proposed scheme divides a grayscale image into several 4 times 4 blocks and further segment each block into four small blocks sized 2 times 2. Each small block chooses one reference point to be proceeded with outer embedding process. The chosen points then formed an inner block to be proceeded with inner embedding...
The advances of network technologies and digital devices facilitate users to exchange multimedia data over the public networks. However, this also raises significant concerns about how to protect sensitive multimedia data from being illegally modified. Therefore, this paper proposes a fragile watermarking scheme to detect illegitimate alterations of a watermarked image. The proposed method hides a...
Data embedding is one of the important issues for securely conveying secrets from senders to receivers without arousing any notices to attackers. Wet paper coding (WPC) is one of the data embedding schemes which embeds secrets into a subset of pixels of an image. The pixels in the subset are also called dry pixels. Inspired by wet paper coding, a novel data embedding scheme with a magic matrix is...
This paper presents a reversible data embedding scheme with prediction and dissimilar techniques for palette-based images. Two embedding rules are imported in the proposed method, and no extra bit map is required to indicate which rules are applied in which pixels to embed secrets. As the experimental results show, when the hiding capacity is 255 Kb, the visual quality of the decoded image for our...
In most data-hiding schemes, the area of interest in the cover image cannot be protected from being modified. In this paper, we propose a data-hiding scheme in which the changeable and unchangeable pixels can be specified by the data-hider. To reduce the size of extra information, the location map used to depict the location information of changeable and unchangeable pixels is compressed by Run Length...
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