Yang Ren-er

Image Steganography Combined with DES Encryption Pre-processing

In order to improve the security of steganography, this paper studied image steganography combined with pre-processing of DES encryption. When transmitting the secret information, firstly, encrypt the information intended to hide by DES encryption is encrypted, and then is written in the image through the LSB steganography. Encryption algorithm improves the lowest matching performance between the image and the secret information by changing the statistical characteristics of the secret information to enhance the anti-detection of the image steganography. The experimental results showed that the anti-detection robustness of image steganography combined with pre-processing of DES encryption is found much better than the way using LSB steganography algorithms directly.

Standard compliant multiple description coding based on regions of interest

A standard compliant multiple description coding based on regions of interest is presented for protecting a region of interest (ROI) in an image sent over lossy communication networks. The multiple description coding is introduced based on multiple-path transmit framework, which can offer a variety of tradeoff between transmission robustness and code efficiency, and the original model can be achieved by generating several subsets from the original image data. The proposed method exploit polyphase downsampling to split the original image date multiple descriptions. For the sake of protection, a higher bit rate is adopted in coding the ROI. Simulation shows the proposed method can offers intrinsic resiliency in case of loss in addition to effective ROI protection.

A motion adaptive de-interlacing algorithm based on edge-dependent interpolation

This article proposes a new motion-adaptive de-interlacing algorithm based on edge-dependent interpolation. By making full use of the correlation between temporal and spatial information and adopting the new de-interlacing algorithm, the motion components are extracted from still video image in video sequence. The missing pixels in motion part are interpolated by running the edge-dependent algorithm. In contrast, the missing pixels in the static part are interpolated by running the median filtering algorithm instead to improve the video resolution. The algorithm simulation results show that the improvement can be found in both subject visual effect and image Peak Signal Noise Ration (PSNR).

Redundancy insertion of frame-based multiple description video codec

In video stream transmission over unreliable networks, the loss of a packet may result in an entire video frame, which may consequently cause severe degradation of all subsequent frames. To solve the problem, based on prediction, presented in this paper is a new pre- and post processing method with flexible redundancy insertion between descriptions for Frame-based multiple description code. The simulation shows that the presented method demonstrates its adequate efficiency in preventing error propagation. Moreover, the system is more robust in the case of packet-loss over different networks.

On pair-wires cross-talk

The cross-talk is the major limiting issue in next generation dsl systems. The reason for generalize NEXT and FEXT is consider in this paper. Twisted Pair channel cross-talk model from 0 Hz to 30 MHz is proposed. Computer simulation results based on our models and France Telecom R&D measured channels are compared. These results verified that our proposed model matched measured channel data very well, and also agreed with the real environment. This model is very useful for VDSL2 system research and design.