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隧道窑边隙过大造成的危害 被引量:1
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作者 周天津 梁嘉琪 《砖瓦》 2016年第4期29-30,共2页
合理的边隙是保障窑车在窑炉安全运转和正常焙烧的重要条件之一,忽视边隙就会严重影响产品质量和窑炉的焙烧速度,造成大的损失。
关键词 隧道窑 边隙距离 码坯方式
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An improved method for edge detection based on neighbor distance for processing hemispheric photography
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作者 Yasi Liu Dayong Fan +1 位作者 Han Sun Xiangping Wang 《Journal of Plant Ecology》 SCIE CSCD 2024年第2期134-145,共12页
Hemisphere photos are now widely applied to provide information about solar radiation dynamics,canopy structure and their contribution to biophysical processes,plant productivity and ecosystem properties.The present s... Hemisphere photos are now widely applied to provide information about solar radiation dynamics,canopy structure and their contribution to biophysical processes,plant productivity and ecosystem properties.The present study aims to improve the original‘edge detection’method for binary classifcation between sky and canopy,which works not well for closed canopies.We supposed such inaccuracy probably is due to the infuence of sky pixels on their neighbor canopy pixels.Here,we introduced a new term‘neighbor distance’,defned as the distance between pixels participated in the calculation of contrast at the edges between classifed canopy and sky,into the‘edge detection’method.We showed that choosing a suitable neighbor distance for a photo with a specifc gap fraction can signifcantly improve the accuracy of the original‘edge detection’method.We developed an ND-IS(Neighbor Distance-Iteration Selection)method that can automatically determine the threshold values of hemisphere photos with high accuracy and reproductivity.It combines the modifed‘edge detection’method and an iterative selection method,with the aid of an empirical power function for the relationship between neighbor distance and manually verifed gap fraction.This procedure worked well throughout a broad range of gap fractions(0.019-0.945)with different canopy compositions and structures,in fve forest biomes along a broad gradient of latitude and longitude across Eastern China.Our results highlight the necessity of integrating neighbor distance into the original‘edge detection’algorithm.The advantages and limitations of the method,and the application of the method in the feld were also discussed. 展开更多
关键词 hemisphere photos ‘edge detection’method neighbor distance gap fraction forest
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