基于字頻分布的中文網(wǎng)頁(yè)編碼識(shí)別研究
[Abstract]:With the rapid development of computer technology, the Internet has become an important way for people to share information. However, with the emergence of a large number of bad web pages, the situation of network security is becoming more and more serious, which has become the focus of attention. Web content filtering is an important research field in network security, and coding and recognition is a necessary prerequisite for web content filtering. Due to historical and regional reasons, there are many Chinese coding standards, and the coexistence of multiple Chinese codes brings inconvenience to the content filtering of Chinese web pages. Therefore, how to quickly and accurately identify the coding of web pages has become a hot topic. This paper introduces the features of Chinese coding such as GB code, large five code and Wanguo code, and studies the coding recognition algorithms such as Bayesian classification, Unigram and CodeFinder. The above algorithms can not eliminate the interference of ASCII codes in web pages, resulting in low recognition accuracy and time efficiency. In order to solve this problem, a Chinese page coding recognition algorithm based on word frequency distribution is proposed in this paper. According to the word frequency distribution of Chinese characters, FKI.FKI selects the characters with high frequency to form a high frequency character table. The high frequency character encoding is used as the key word to be searched in the web page to be identified, and the noise (such as ASCII code) is avoided. By comparing the matching number of different codes in the web page, the real code system of the web page to be identified is finally determined. The FKI algorithm selects high-frequency characters as keywords, and these keywords have a high utilization rate in Chinese web pages. The algorithm is suitable for almost all Chinese web page coding recognition. The AC algorithm is improved to fit the matching of Chinese high frequency character encoding in web pages. The improved AC algorithm constructs the reverse state automaton and searches keywords in bytes. When a byte mismatch occurs, the jump distance is calculated by using the byte corresponding to the "0" state as the mismatch byte. The jump distance of mismatch is increased, and the matching efficiency of Chinese coding is improved. Finally, the FKI algorithm, Unigram algorithm and CodeFinder algorithm are compared and tested. The experimental results show that compared with the above two algorithms, the FKI algorithm has higher accuracy and superior time efficiency, and is suitable for fast and accurate coding recognition of Chinese web pages with unknown coding system.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TP391.1;TP393.092
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