Boundary extraction of watershed is an important step in forest landscape research. The boundary of the upriver wa-tershed of the Hunhe River in the sub-alpine Qingyuan County of eastern Liaoning Province, China was e...Boundary extraction of watershed is an important step in forest landscape research. The boundary of the upriver wa-tershed of the Hunhe River in the sub-alpine Qingyuan County of eastern Liaoning Province, China was extracted by digital elevation modeling (DEM) data in ArcInfo8.1. Remote sensing image of the corresponding region was applied to help modify its copy according to Enhanced Thematic Mapper (ETM) image抯 profuse geomorphological structure information. Both the DEM-dependent boundary and modified copy were overlapped with county map and drainage network map to visually check the effects of result. Overlap of county map suggested a nice extraction of the boundary line since the two layers matched precisely, which indicated the DEM-dependent boundary by program was effective and precise. Further upload of drainage network showed discrepancies between the boundary and the drainage network. Altogether, there were three sections of the extraction result that needed to correct. Compared with this extraction boundary, the modified boundary had a better match to the drainage network as well as to the county map. Comprehensive analysis demonstrated that the program extraction has generally fine precision in position and excels the digitized result by hand. The errors of the DEM-dependant extraction are due to the fact that it is difficult for program to recognize sections of complex landform especially altered by human activities, but these errors are discernable and adjustable because the spatial resolution of ETM image is less than that of DEM. This study result proved that application of remote sensing information could help obtain better result when DEM method is used in extraction of watershed boundary.展开更多
A kind of image distortion in Optical Coherence Tomography (OCT) resulted from average refractive index changes between structures of bio tissue is discussed for the first time.Analysis is given on following situation...A kind of image distortion in Optical Coherence Tomography (OCT) resulted from average refractive index changes between structures of bio tissue is discussed for the first time.Analysis is given on following situations:1) Exact refraction index changes between microstructures;2)The gradient of average refractive index change between different tissue layers is parallel to the probe beam;3) The gradient of average refractive index change is vertical to the probe beam.The results show that the image distortion of situation 1) is usually negligible;in situation 2) there is a spread or shrink effect without relative location error; however,in situation 3) there is a significant image error inducing relative location displacement between different structures.Preliminary design to eliminate the distortion is presented,the method of which mainly based on the image classification and pixel array re arrangement.展开更多
Hannah Arendt, the new film by the German director Margarethe Von Trotta, does not seem just like another trying to represent philosophy through the classic cinematic storytelling. It builds instead a perfect dialogue...Hannah Arendt, the new film by the German director Margarethe Von Trotta, does not seem just like another trying to represent philosophy through the classic cinematic storytelling. It builds instead a perfect dialogue between these two practices that never encroach each other： There is not any doctrine that prevents cinema＇s freedom to create images and any philosophy claim that forces cinema to find in images an alternative way of expression. Von Trotta leaves any biopic form and stages a harmonic building where cinema fulfills philosophy and philosophy fulfills cinema. In this way she gets an outright practical exhibition of a theory, the ＂banality of evil＂. We want to comprehend the reasons of this perfect building analyzing this film, its characters with their acts, all the images their montage, and editing, everything that supports the Arendt＇s philosophical notion. We work on the film with the philosophical categories created by Gilles Deleuze to study the history of cinema in two essays, Image-mouvement and Image-time. In this way we can unfold how Margarethe Von Trotta represents a theory through images, without any word as intermediary展开更多
基金This work was supported by Knowledge Innovation Pro-gram Chinese Academy of Sciences (No. KZCX2-SW-320-3 & KZCX3-SW-425).
文摘Boundary extraction of watershed is an important step in forest landscape research. The boundary of the upriver wa-tershed of the Hunhe River in the sub-alpine Qingyuan County of eastern Liaoning Province, China was extracted by digital elevation modeling (DEM) data in ArcInfo8.1. Remote sensing image of the corresponding region was applied to help modify its copy according to Enhanced Thematic Mapper (ETM) image抯 profuse geomorphological structure information. Both the DEM-dependent boundary and modified copy were overlapped with county map and drainage network map to visually check the effects of result. Overlap of county map suggested a nice extraction of the boundary line since the two layers matched precisely, which indicated the DEM-dependent boundary by program was effective and precise. Further upload of drainage network showed discrepancies between the boundary and the drainage network. Altogether, there were three sections of the extraction result that needed to correct. Compared with this extraction boundary, the modified boundary had a better match to the drainage network as well as to the county map. Comprehensive analysis demonstrated that the program extraction has generally fine precision in position and excels the digitized result by hand. The errors of the DEM-dependant extraction are due to the fact that it is difficult for program to recognize sections of complex landform especially altered by human activities, but these errors are discernable and adjustable because the spatial resolution of ETM image is less than that of DEM. This study result proved that application of remote sensing information could help obtain better result when DEM method is used in extraction of watershed boundary.
文摘A kind of image distortion in Optical Coherence Tomography (OCT) resulted from average refractive index changes between structures of bio tissue is discussed for the first time.Analysis is given on following situations:1) Exact refraction index changes between microstructures;2)The gradient of average refractive index change between different tissue layers is parallel to the probe beam;3) The gradient of average refractive index change is vertical to the probe beam.The results show that the image distortion of situation 1) is usually negligible;in situation 2) there is a spread or shrink effect without relative location error; however,in situation 3) there is a significant image error inducing relative location displacement between different structures.Preliminary design to eliminate the distortion is presented,the method of which mainly based on the image classification and pixel array re arrangement.
文摘Hannah Arendt, the new film by the German director Margarethe Von Trotta, does not seem just like another trying to represent philosophy through the classic cinematic storytelling. It builds instead a perfect dialogue between these two practices that never encroach each other： There is not any doctrine that prevents cinema＇s freedom to create images and any philosophy claim that forces cinema to find in images an alternative way of expression. Von Trotta leaves any biopic form and stages a harmonic building where cinema fulfills philosophy and philosophy fulfills cinema. In this way she gets an outright practical exhibition of a theory, the ＂banality of evil＂. We want to comprehend the reasons of this perfect building analyzing this film, its characters with their acts, all the images their montage, and editing, everything that supports the Arendt＇s philosophical notion. We work on the film with the philosophical categories created by Gilles Deleuze to study the history of cinema in two essays, Image-mouvement and Image-time. In this way we can unfold how Margarethe Von Trotta represents a theory through images, without any word as intermediary
