Dazu Huang

Learn More
The reason why only small capacity information can be hidden in DCT domain of image is analyzed, a information hiding algorithm of high capacity for DCT domain is proposed. In our scheme, the uniform spectrum processing is first applied to the original image. Then, a global DCT transformation of the image is finished. Finally, the hidden information is(More)
The causation that why the capacity of information hiding algorithm based on DCT domain is small is analyzed, a large capacity blind information hiding algorithm based on DCT domain is proposed. First, uniform spectrum processing act on the carrier image, then the image is processed globe DCT transform. Finally, the information, which is to be hidden, is(More)
—Improving hiding capacity and resisting compression ability is an important problem in information hiding application. In this paper, invariance of JPEG compression is analyzed firstly. Then, according to invariance of JPEG compression, an information hiding algorithm which can embed information in DCT median and high frequency coefficients is proposed.(More)
An explicit design of a linear dispersive space-time-frequency (STF) code is investigated with a design criterion achieving a high rate for frequency-selective channels when the partial interference cancelation (PIC) group decoding is implemented at receiver. With an appropriate grouping scheme, the proposed STF code is shown to obtain a similar diversity(More)
—Motivated by multi-step quantum teleportation of single-qubit states and two-qubit states with entanglement swapping, we present a small scale quantum network communication scheme based on entanglement of Bell states. In this scheme, it contains certain number of single-qubit quantum source nodes that teleport unknown quantum states to other nodes in the(More)