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Articles by Dan Xu
Total Records ( 3 ) for Dan Xu
  Dang-en Xie , Zhili Zhang and Dan Xu
  For the traditional image abstraction methods are not well preserved edge information, this study propose an image abstraction method based on the local extremum filter. First, calculate the maximum and minimum values of each pixel on its neighborhood. Second, replace the current pixel value with the weighted value. At last, use the DoG edge detecting operator to enhance the smoothed image to obtain the final abstract image. The experiment shown, this method has a better smooth effect than others, especially on area smoothing and edge preserving.
  Guo-Wu Yuan , Jian Gong , Mei-Ni Deng , Hao Zhou and Dan Xu
  Moving objects detection is an important research of computer vision. Optical flow method is a main way, but it is limited to use because of its complexity. A moving objects detection algorithm based on three-frame difference and optical flow is proposed. The calculation of optical flow is simplified. Harris corners are detected and then only the corners are selected to compute optical flow information, which reduce the algorithm’s complexity. Because the detected moving target area is not complete, three-frame difference method is introduced as a supplement. The experimental results show that the algorithm can achieve real-time and has better results than anyone of these two separate algorithms.
  Gaoshui Yu , Wenlong Zhang , Yong Huang , Li Ding , Wei Li , Zhaocai Li , Dan Xu , Feng Dong , Qian Du and Dewen Tong
  Ghrelin, a gastric acylated peptide has been shown to express in gastrointestinal tract of many animals. However, little is known about its expression pattern in gastrointestinal tract of ruminants such as goat. In this study, researchers investigated the expression and distribution of ghrelin in the gastrointestinal tract of goat (Saanen dairy goat) including esophagus, rumen, reticulum, omasum, abomasus, duodenum, jejunum, ileum, appendix, colon and rectum by PCR, Immunohistochemistry (IHC) and Western blot. The PCR detection showed that ghrelin mRNA existed in all the above tissues and was significantly higher in the abomasus than in other tissues detected (p<0.05). Immunohistochemistry assay showed that ghrelin-positive cells were observed in the mucosal layer of all segments examined. The ghrelin-positive cells were most numerous in the abomasus, less abundant in the duodenum, occasional in jejunum, ileum, appendix, colon and rectum and rare in esophagus, rumen, reticulum, omasum and abomasus. Western blot analysis confirmed the ghrelin protein expression pattern in the gastrointestinal tract of the goat. These results demonstrate that ghrelin is expressed in the gastrointestinal tract of Saanen dairy goat, especially in the abomasus.
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