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This paper proposes a research framework for graphic digital text Watermarking algorithms and methods. We summarized graphic text watermarking after a brief review of digital text watermarking, and propose the research framework that consists of 8 levels, such as pixel, line, etymon, character, row, paragraph, page, and chapter. According to the embedding methods, each level is divided into three...
Base distributed database technology has been widely used in missive data processing. The problem of the efficiency of multi-dimensional data query which is caused by its single primary key indexing becomes more apparent. This paper proposed and implemented a multi-dimensional query method based on Hilbert space-filling curve. Using the Hilbert space filling curve to make the multi-dimensional data...
With the development of radio frequency identification (RFID) technology, RFID systems have been used in various applications. But the tag collision problem greatly affects the performance of many RFID systems, especially in large scale tag identification environments. In this paper, we propose two new efficient tag anti-collision protocols, i.e., the assigned tree slotted Aloha (ATSA) protocol and...
Recently, dictionary learned by sparse coding has been widely adopted in image classification and has achieved competitive performance. Sparse coding is capable of reducing the reconstruction error in transforming low-level descriptors into compact mid-level features. Nevertheless, dictionary learned by sparse coding does not have the ability to distinguish different classes. That is to say, it is...
Mongolian coding are not unified and it has seriously affected the Mongolian information processing development. .This paper mainly discusses the conversion from Mongolian coding systems based on the word shapes to the Mongolian international standardized coding. In order to achieve the conversion with unified approach, we use the Min-Morpheme coding as an intermediary. The method based on rules correspondence...
A relatively unexplored problem in facial expression analysis is how to select the positive and negative samples with which to train classifiers for expression recognition. Typically, for each action unit (AU) or other expression, the peak frames are selected as positive class and the negative samples are selected from other AUs. This approach suffers from at least two drawbacks. One, because many...
Recent research has proven that network coding has great potential to improve network throughput in wireless networks. To fully exploit the performance gain brought by network coding, coding-aware routing has been studied to proactively change route of flows for creating more coding opportunities. However, in today's multi-rate wireless networks, coding may not be a wise decision as the lowest rate...
Although tamper and delete attack problem is difficult to overcome, this paper proposes a novel algorithm based on the statistical characteristics of phrase frequency to solve it. The algorithm takes watermark as information entropy and Chinese characters' code as partial probability distribution values. As a result, the problem of sequence absence brought by delete attack is converted into sorting...
This paper gives a tutorial overview of ultrawide-band communications systems for sensor networks. In particular, we describe the IEEE 802.15.4a standard, which is currently being developed. While most nodes (reduced-function devices) in sensor networks usually have to consume little energy, and are constrained with respect to the complexity of the processing they can perform, some nodes (full-function...
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