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| 1 | Scene recognition combining structural and textural features显示文摘Automatic recognition of the contents of a scene is an important issue in the field of computer vision. Although considerable progress has been made, the complexity of scenes remains an important challenge to computer vision research. Most previous approaches for scene recognition are based on the so-called 'bag of visual words' model, which uses clustering methods to quantize numerous local region descriptors into a codebook. The size of the codebook and the selection of initial clustering centers greatly affect the performance. Furthermore, the large size of the codebook leads to high computational costs and large memory consumption. To overcome these weaknesses, we present an unsupervised natural scene recognition approach that is not based on the 'bag of visual words' model. This approach constructs multiple images of different resolutions and extracts structural and textural features from these images. The structural features are represented by weighted histograms of the gradient orientation descriptor, which is presented in this paper, and the textural features are represented by filter responses of Gabor filters and a Schmid set. We regard the structural and textural features as two independent feature channels, and combine them to realize automatic categorization of scenes using a support vector machine. We then evaluated our approach using three commonly used datasets with various scene categories. Our experiments demonstrate that the weighted histograms of the gradient orientation descriptor outperform the classical scale invariant feature transform descriptor in natural-scene recognition, and our approach achieves good performance with respect to current state-of-the-art methods. | ZHOU Li HU DeWen ZHOU ZongTan | 2013 | Science China(Information Sciences)2013，56，7： | 7 |
| 2 | Classification and 3-D distribution of upper layer water masses in the northern South China Sea显示文摘Using the fuzzy cluster analysis and the temperature-salinity(T-S) similarity number analysis of cruise conductivity-temperature-depth(CTD) data in the upper layer(0–300 m) of the northern South China Sea(NSCS), we classify the upper layer water of the NSCS into six water masses: diluted water(D), surface water(SS),the SCS subsurface water mass(U_S), the Pacific Ocean subsurface water mass(U_P), surface-subsurface mixed water(SU) and subsurface-intermediate mixed water(UI). A new stacked stereogram is used to illustrate the water mass distribution, and to examine the source and the distribution of U_P, combining with the sea surface height data and geostrophic current field. The results show that water mass U_P exists in all four seasons with the maximum range in spring and the minimum range in summer. In spring and winter, the U_P intrudes into the Luzon Strait and the southwest of Taiwan Island via the northern Luzon Strait in the form of nonlinear Rossby eddies, and forms a high temperature and high salinity zone east of the Dongsha Islands. In summer, the U_P is sporadically distributed in the study area. In autumn, the U_P is located in the upper 200 m layer east of Hainan Island. | Jia Zhu Quanan Zheng Jianyu Hu Hongyang Lin Dewen Chen Zhaozhang Chen Zhenyu Sun Liyan Li Hao Kong | 2019 | Acta Oceanologica Sinica2019，38，4： | 5 |
| 3 | Physiological performance of three calcifying green macroalgae Halimeda species in response to altered seawater temperatures显示文摘The effects of seawater temperature on the physiological performance of three Halimeda species were studied for a period of 28 d.Five treatments were established for Halimeda cylindracea,Halimeda opuntia and Halimeda lacunalis,in triplicate aquaria representing a factorial temperature with 24°C,28°C,32°C,34°C and 36°C,respectively.The average Fv/Fm of these species ranged from 0.732 to 0.756 between 24°C and 32°C but declined sharply between 34°C(0.457±0.035)and 36°C(0.122±0.014).Calcification was highest at 28°C,with net calcification rates(Gnet)of(20.082±2.482)mg/(g·d),(12.825±1.623)mg/(g·d)and(6.411±1.029)mg/(g·d)for H.cylindracea,H.opuntia and H.lacunalis,respectively.Between 24°C and 32°C,the specific growth rate(SGR)of H.lacunalis(0.079%–0.110%d–1)was lower than that of H.cylindracea(0.652%–1.644%d–1)and H.opuntia(0.360%–1.527%d–1).Three Halimeda species gradually bleached at 36°C during the study period.Malondialdehyde(MDA)and proline levels in tissues of the three Halimeda were higher in 34–36°C than those in 24–32°C.The results indicate that seawater temperature with range of 24–32°C could benefit the growth and calcification of these Halimeda species,however,extreme temperatures above 34°C have negative impacts.The measured physiological parameters also revealed that H.cylindracea and H.opuntia displayed broader temperature tolerance than H.lacunalis. | Zhangliang Wei Jiahao Mo Ruiping Huang Qunju Hu Chao Long Dewen Ding Fangfang Yang Lijuan Long | 2020 | Acta Oceanologica Sinica2020，39，2： | 2 |
| 4 | Right anterior cingulate gyrus in encephalic region associated with integrating and processing Chinese words information in working memory: A functional magnetic resonance imaging study显示文摘BACKGROUND: Many experimental results have been found in previous studies on whether laterality of brain cingulate gyrus exists in processing Chinese words information. OBJECTIVE: To observe the function of right anterior cingulate gyrus and activation showed by MRI in processing Chinese words in a visual working memory judgment tasks, and evaluate the laterality of activated brain regions. DESIGN: Observation experiment. SETTING: The Medical Psychological Research Center, Second Xiangya Hospital of Central South University. PARTICIPANTS: Thirteen healthy volunteers (7 males and 6 females), aged (29±7)years ranging from 23 to 36 years old, participated in this fMRI study during August 2003 to Febuary 2004. They gave informed consent in accordance with guidelines set by Second Xiangya Hospital of Central South University. All subjects were native Chinese speakers and strongly right handed. METHODS: In this study, Chinese numeral words were used as test materials and test mode of Sternberg was used in cognitive task, it was aimed to investigate the encephalic region involved in the storage and processing of Chinese numerical information. ①The head of subject was fixed with dense foam pad. Visual working task was performed according to the requests. Verbal working task was that the subject saw target items for four numerals written in Chinese, presenting for 1.5 s and then, after a short time by blank for 3.0 s. The subject saw one numeral presenting for 1.5 s and had to press one button if it was one of the shown numbers and another button if it did not belong to the presented numbers. There were two visual working memory stimuli in each stimulation block. The experiment was conducted in a single run, which consisted of seven blocks of visual working memory tasks. Different Chinese numerals were displayed in each block to avoid any practice effect (The response rate of the whole working memory task was 50%). ②The activation of brain was scanned with a 1.5T MRI scanner (GE Signa Twinspeed) (slice thickness 5 mm, slice gap 1.5 mm, slice parallel to line between pars geniculate and splenium in corpus callosum from corona capitis to superior part of cerebellum, totally 16 to 18 layers). ③The obtained images were pre-processed and statistically analysed with SPM 99 software. The procedure included timeslice adjusted, realigned, nomalized and smoothed. According to experimental task, data from each subject were analysed to obtain t value of each voxel. Brain activation image was got by Student’s t test and statistic was presented by pseudo-color. Statistical parameter image was formed by overlapping brain activation image on three-dimensional structure image, and the threshold value was set at P < 0.05 with ten or more continous voxels (T ≥ 4.64, K ≥ 10 voxels). The brain activation images of all the subjects were calculated and overlapped into mean brain activation images. The regions with different activation density were found out. The activation voxels in regions-of-interest were checked to calculate a laterality index for each condition. The negative value indicated right hemisphere dominance. MAIN OUTCOME MEASURES: fMRI activation and laterality coefficient of Chinese numerial working task. RESULTS: Thirteen healthy subjects participated in the result analysis. ①fMRI activation of Chinese numerial working task: The results showed that the working memory task with Chinese words not only activated left cerebral cortex including left superior frontal gyrus (BA6/10), left middle frontal gyrus (BA9), left inferior frontal gyrus (BA45/9/47), but also activated right cerebral cortex including right middle frontal gyrus (BA10/46/8), right inferior frontal lobe (BA47). Specially, peak activation was located in right anterior cingulate gyrus (BA32) with an activation volume of 879 (voxels). It indicated that superior, middle and inferior frontal gyrus, bilateral Broca regions and anterior cingutate involved in the working memory of Chinese words. ②Asymmertry index : The asymmetry index was -0.47 for frontal lobe, +0.42 for temporal lobe, +0.14 for parietal lobe and -1.00 for occipital lobe. It indicated that the right frontal lobe, left temporal lobe, left parietal lobe and right occipital lobe were more involved in the Chinese numerial working task. CONCLUSION: Brain activation in processing Chinese words in the visual working memory task broadly involves both the left and right hemisphere cortex. And right anterior cingulate gyrus (BA 32) plays an important role in integrating and processing intensive visuospatial ability. | Daxing Wu Lirong Yan Changlian Tan Dewen Hu Wai Cheong Carl Tam Yadong Liu Zongtan Zhou Xiang Wang Ding Liu Shuqiao Yao | 2006 | Neural Regeneration Research2006，1，5： | 2 |
| 5 | Tide- and wind-driven variability of water level in Sansha Bay, Fujian, China显示文摘 | Hongyang LIN Jianyu HU Jia ZHU Peng CHENG Zhaozhang CHEN Zhenyu SUN Dewen CHEN | 2017 | Frontiers of Earth Science2017，11，2： | 2 |
| 6 | Unscented Kal- man Filtering for Additive Noise Case: Augmented versus Non- augmented 显示文摘 | Yuanxin Wu Dewen Hu Meiping Wu | 2005 | IEEE signal Processing letters2005，12，5： | 1 |
| 7 | Brain activation regions in schizophrenia patients performing the game piece memory task显示文摘BACKGROUND:Go,a traditional Chinese chess-like game,requires many unknown functions of the brain including attention,imaging,problem solving and processing of spatial working memory. To date,it remains uncertain whether the intellectual activities required to play Go are related to the frontal lobe. OBJECTIVE:To investigate various patterns of brain region activity while schizophrenic patients and normal subjects engaged in memorizing piece placement in the Chinese game of Go.Spatial working memory was measured in order to validate whether the prefrontal lobe participates in this memory process. DESIGN,TIME AND SETTING:Non-randomized,concurrent control trial was performed at Second Xiangya Hospital of Central South University,between May and December 2004. PARTICIPANTS:A total of nine Chinese schizophrenic patients with no brain or bodily diseases and not undergoing electroshock treatment,who were in accordance with the DSM-Ⅳcriteria for schizophrenia,as well as thirteen healthy staffs and students with matched age,sex,and education were included.Patients and control subjects had no neurological disorders or mental retardation.In addition,all participants were right-handed. METHODS:The cognitive task for functional magnetic resonance imaging was a block design experiment.Both groups were asked to remember the placement of pieces in the Chinese game of Go on a computer screen.A brain activation map was analyzed in SPM99. MAIN OUTCOME MEASURES:Brain responses were compared with regard to activation region size,volume,and asymmetry indices. RESULTS:Compared with the control group,the reaction time was significantly delayed in schizophrenics performing the working memory task(P<0.05).When performing the tasks, normal subjects showed significant activation of the bilateral dorsolateral prefrontal lobe with left dominance;the asymmetry indices were:frontal lobe,+0.32;temporal lobe,0.58;parietal lobe, 0.41;and occipital lobe,-0.34.On the other hand,schizophrenics showed right dominance and had a broader activation region of the prefrontal lobe(asymmetry indices:frontal lobe,-0.10; temporal lobe,+0.38;parietal lobe,+0.24;and occipital lobe,0.00).When comparing the normal group subtracted with the schizophrenic group,no significant lateralization was found in the frontal lobes but significant activation was found in the left anterior central gyrus,left middle frontal gyrus and in both sides of the cingulate gyrus.Comparing the schizophrenic group subtracted with the normal group,there was significant right lateralization of the frontal lobe and abnormally activated regions on both sides of the anterior central gyrus,middle frontal gyrus,left inferior frontal gyrus, right medial frontal gyrus and the right insular lobe. CONCLUSION:Different brain activation regions are involved in memorizing the placement of pieces in Chinese Go between schizophrenia and healthy subjects.Schizophrenics showed right dominance and border activation range,indicating that the prefrontal cortex plays an important role in memory information processing and resource allocation when remembering piece placement in the game of Go. | Daxing WU Huifang Yin Lirong Yan Changlian Tan Dewen Hu Shuqiao Yao | 2009 | Neural Regeneration Research2009，4，2： | 1 |
| 8 | CATSMLP: Toward a robust and interpretable multilayer perceptron with sigmoid activation functions 显示文摘 | Fu-Lai Chung Shitong Wang Zhaohong Deng Dewen Hu | 2006 | IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS-PART B: CYBERNETICS2006，36，6： | 1 |
| 9 | A numerical- integration perspective on Gaussian filters显示文摘 | Yuanxin Wu Dewen Hu Meiping Wu | 2006 | IEEE Trans on Signal Processing2006，54，8： | 1 |
| 10 | Graph-based image segmentation using directional nearest neighbor graph显示文摘Graph-based image segmentation techniques generally represent the problem in terms of a graph.In this work,we present a novel graph,called the directional nearest neighbor graph.The construction principle of this graph is that each node corresponding to a pixel in the image is connected to a fxed number of nearest neighbors measured by color value and the connected neighbors are distributed in four directions.Compared with the classical grid graph and the nearest neighbor graph,our method can capture low-level texture information using a less-connected edge topology.To test the performance of the proposed method,a comparison with other graph-based methods is carried out on synthetic and real-world images.Results show an improved segmentation for texture objects as well as a lower computational load. | LIU Zhao HU DeWen SHEN Hui FENG GuiYu | 2013 | Science China(Information Sciences)2013，56，11： | 1 |
| 11 | Unscented Kalman Filtering for Additive Noise Case: Augmented versus Nonaugmented 显示文摘 | Yuanxin Wu Dewen Hu Meiping Wu Xiaoping Hu | 2005 | IEEE Signal Processing Letters (S1070-9908)2005，12，5： | 1 |
| 12 | An alternative formulation of kernel LPP with application to image recognition 显示文摘 | Guiyu Feng Dewen Hu Davisd Zhang Zongtan Zhou | 2006 | Neurocomputing2006，69，： | 1 |
| 13 | A numerical- integration perspective on Gaussian filters显示文摘 | Yuanxin Wu Dewen Hu Meiping Wu | 2006 | IEEE Trans on Signal Processing2006，54，8： | 1 |
| 14 | Strapdown inertial navigation system algorithms based on dual quaternions显示文摘 | WU YUANXIN HU XIAOPING HU DEWEN | | 0，，01： | 1 |
| 15 | Two-Dimensional Locality Preserving Projections (2DLPP) with Its Application to Palmprint Recognition显示文摘 | Hu Dewen Feng Guiyu Zhou Zongtan | | 0，，01： | 1 |
| 16 | Unscented Kalman filtering for additive noise ease: augmented versus non-augmented 显示文摘 | WU Yuanxin WU Meiping HU Dewen | 2005 | IEEE Signal Processing Letters2005，12，5： | 1 |
| 17 | Two-dimensional lo- cality preserving projections(2DLPP) with its application to palmprint recognition 显示文摘 | Hu Dewen Feng Guiyu Zhou Zongtan | 2007 | Pattern Recognition2007，40，1： | 1 |
| 18 | A Numeri-cal -Integration Perspective on Gaussian Filters显示文摘 | Wu Yuanxin Hu Dewen Wu Meiping Hu Xiaoping | 2006 | IEEE Trans-actions on Signal Processing2006，54，29： | 1 |
| 19 | Strapdown inertial navigation system algorithms based on dual quaternions显示文摘 | WU Yuanxin HU Xiaoping HU Dewen | 2005 | IEEE Transactions on Aerospace and Electronic Systems2005，41，1： | 1 |
| 20 | A Numerical-integration Perspective on Gaussian Filters显示文摘 | Wu Yuanxin Hu Dewen Wu Meiping | | 0，，08： | 1 |
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