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Articles by Liang Zhang
Total Records ( 5 ) for Liang Zhang
  Liang Zhang , Xiaomei He and Haili Wang
  Moving object detection is the basis for reliable high level processing such as object tracking and action recognition. Shadow verification processes are very important to ensure integrality of extracted moving objects. Moving features appear in detected shadow regions indicate classification errors. The proposed method identifies false detected shadows by detecting moving features and corrects those classification errors by means of image matting operated on candidate shadow regions. Existing approaches for image matting require manual labeling of foreground and background. We propose an automatic scribbling method followed by a closed-form matting process to solve the coefficient alpha. Then, the alpha image is binarized directly to avoid time-consuming computation for reconstructing foreground. Experiments demonstrate that our method can improve the moving object segmentation effectively even in the case of object parts and shadows presenting similar characteristics.
  Liang Zhang , Yingzi Wu , Longxiang Guo and Ping Cai
  It has been estimated that more than 20% of water supply is being lost due to leakage. In order to promptly find out the leakage from water pipelines, the paper proposes a complete solution of leak acoustic signal correlator for leak detection. When leakage occurs, leak acoustic signals would propagate along the wall of water pipelines which are usually strong correlation. Cross-correlation algorithm is relatively effective for leak detection. And it is often conducted to analyze leak acoustic signals, picked up at both sides of a leak, to determine the position of leak. Based on the principle of leak detection, a set of leak acoustic signal correlator has been designed and implemented, including key parameters selection, circuit design and software development. Key parameters have been determined to ensure the positioning precision and detection distance of leak acoustic signal correlator. Meanwhile in order to satisfy the demands of real-time processing, the architecture of signal processor employs DSP+FPGA as its dual-core. Related tests shows the solution proposed in this paper could be adapted to different occasions of leakage by changing parameters which could also be upgraded as a platform for further study.
  Xiaobing Jiang , Liang Zhang , Siqing Chen , Ketian Wang , Zhuping Chen , Lei Chen , Jinyong Wang and Li Zhu
  Ultrasound measure is an important tool to evaluate carcass merit in live swine and the accuracy of ultrasonic measurement directly related to the breeding process. Here, researchers studied the effects of machine, posture and technician factors on the accuracy of ultrasonic measurement in live swine. The results indicated that the accuracy of A-mode ultrasonic machine measurement was lower than B-mode ultrasonic machine measurement and the accuracy of B-mode ultrasonic machine with equipped 3.5 MHz linear array probe performed the highest accuracy. Measured through the ultrasonic machine back fat thickness obtained from both the posture of bowing back (p<0.01) and standing posture with mouth contacting with the ground (p<0.05) were statistically significant different from the real carcass backfat thickness. Obtained from the posture of pigs were standing naturally both backfat thickness and logissimus muscle area were most approximated to the true value. During the operation of ultrasonic machine, the value of backfat thickness recognised by unexperienced technicians was statistically significantly different (p<0.01) from the true value. Thus in the process of measure both back fat thickness and logissimus muscle area through ultrasonic machine, the types of machine, the posture of pig standing and the skill level of technicians were validated to influence the obtaining of true value. In conclusion, the results indicated that the accuracy of ultrasonic measurement can be improved by suitable machines and probes, obtain picture while pig are standing naturally and skilled technicians.
  Zheyuan Xiong , Jiangshan Zhang , Shengyi Wu , Liang Zhang and Min Tu
  The major task of WMSN is image communication, which is really a challenge for resource constraint wireless sensors. WMSN should monitor the image distortion by image quality assessment (IQA) to take some adaptive precautions and thus guarantee application quality requirements. Most applications of WMSN require reliable transmission of Region of interest (ROI) in the image. However, little study has been taken on identifying how and to what extent ROI will influence IQA in WMSN. In this work, a simple method is proposed to estimate an image quality by considering the ROI of the image. Different weights are assigned to the primary ROI, secondary ROI and Non ROI parts of the image in the quality evaluation phase. The simulation results have shown that the proposed IQA has better performance than state-of-the-art IQA methods for WMSN.
  Liang Zhang , Weizhi Liu , Tiancen Hu , Li Du , Cheng Luo , Kaixian Chen , Xu Shen and Hualiang Jiang
  β-Hydroxyacyl-acyl carrier protein dehydratase (FabZ) is an important enzyme for the elongation cycles of both saturated and unsaturated fatty acids biosyntheses in the type II fatty acid biosynthesis system (FAS II) pathway. FabZ has been an essential target for the discovery of compounds effective against pathogenic microbes. In this work, to characterize the catalytic and inhibitory mechanisms of FabZ, the crystal structures of the FabZ of Helicobacter pylori (HpFabZ) and its complexes with two newly discovered inhibitors have been solved. Different from the structures of other bacterial FabZs, HpFabZ contains an extra short two-turn α-helix (α4) between α3 and β3, which plays an important role in shaping the substrate-binding tunnel. Residue Tyr-100 at the entrance of the tunnel adopts either an open or closed conformation in the crystal structure. The crystal structural characterization, the binding affinity determination, and the enzymatic activity assay of the HpFabZ mutant (Y100A) confirm the importance of Tyr-100 in catalytic activity and substrate binding. Residue Phe-83 at the exit tunnel was also refined in two alternative conformations, leading the tunnel to form an L-shape and U-shape. All these data thus contributed much to understanding the catalytic mechanism of HpFabZ. In addition, the co-crystal structures of HpFabZ with its inhibitors have suggested that the enzymatic activity of HpFabZ could be inhibited either by occupying the entrance of the tunnel or plugging the tunnel to prevent the substrate from accessing the active site. Our study has provided some insights into the catalytic and inhibitory mechanisms of FabZ, thus facilitating antibacterial agent development.
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