The false topographic perception phenomenon(FTPP)refers to the visual misperception in remote-sensing images that certain types of terrains are visually interpreted as other types in rugged lands,for example,valleys a...The false topographic perception phenomenon(FTPP)refers to the visual misperception in remote-sensing images that certain types of terrains are visually interpreted as other types in rugged lands,for example,valleys as ridges and troughs as peaks.For this reason,the FTPP can influence the visualization and interpretation of images to a great extent.To scrutinize this problem,the paper firstly reviews and tests the existing FTPP-correction techniques and identifies the inverse slope-matching technique as an effective approach to visually enhance remote-sensing images and retain the colour information.The paper then proposes an improved FTPP-correction procedure that incorporates other image-processing techniques(e.g.linear stretch,histogram matching,and flat-area replacement)to enhance the performance of this technique.A further evaluation of the proposed technique is conducted by applying the technique to various study areas and using different types of remote-sensing images.The result indicates the method is relatively robust and will be a significant extension to geovisual analytics in digital earth research.展开更多
The terrain reversal effect is a perceptual phenomenon which causes an illusion in various 3D geographic visualizations where landforms appear inverted,e.g.we perceive valleys as ridges and vice versa.Given that such ...The terrain reversal effect is a perceptual phenomenon which causes an illusion in various 3D geographic visualizations where landforms appear inverted,e.g.we perceive valleys as ridges and vice versa.Given that such displays are important for spatio-visual analysis,this illusion can lead to critical mistakes in interpreting the terrain.However,it is currently undocumented how commonly this effect is experienced.In this paper,we study the prevalence of the terrain reversal effect in satellite imagery through a two-stage online user experiment.The experiment was conducted with the participation of a diverse and relatively large population(n=535).Participants were asked to identify landforms(valley or ridge?)or judge a 3D spatial relationship(is A higher than B?).When the images were rotated by 180°,the results were reversed.In a control task with‘illusion-free’original images,people were successful in identifying landforms,yet a very strong illusion occurred when these images were rotated 180°.Our findings demonstrate that the illusion is acutely present;thus,we need a better understanding of the problem and its solutions.Additionally,the results caution us that in an interactive environment where people can rotate the display,we might be introducing a severe perceptual problem.展开更多
Terrain reversal effect(TRE)causes reversed 3D shape perception in satellite images and shaded relief maps(SRMs),and introduces difficulties in identifying landforms such as valleys and ridges.With this paper,in a con...Terrain reversal effect(TRE)causes reversed 3D shape perception in satellite images and shaded relief maps(SRMs),and introduces difficulties in identifying landforms such as valleys and ridges.With this paper,in a controlled laboratory experiment,we compare how well 27 participants could identify valleys and ridges over 33 locations using SRMs,color satellite images and grayscale satellite images.The main depth cue is shadow both in vertical-view images and SRMs.However,the presence of texture and color in images also affect 3D shape perception.All our participants experience the illusion strongly:with the SRMs,it is very severe(2%accuracy),with grayscale images low but considerably better than SRMs(17.6%accuracy),and slightly worse with color imagery(15.3%accuracy).These differences between SRMs and imagery suggest that the participants who are able to bypass the illusion consciously or subconsciously interpret the photographic information.We support this observation further with a cue-strength analysis.Furthermore,we provide exploratory analyses of the effects of expertise,global convexity bias,and bistable perception.Our original empirical observations serve towards a better understanding of this visual illusion,and contribute towards nuanced and appropriate solutions to correcting for TRE differently for satellite images and SRMs.展开更多
Source language perception is the beginning and also the most unobservable stage of interpretative activity. According to ESIT, it is the sense that constitutes a communicative intention. Sense cohort theory and requi...Source language perception is the beginning and also the most unobservable stage of interpretative activity. According to ESIT, it is the sense that constitutes a communicative intention. Sense cohort theory and requirement equation upon interpreter shall be presented in the paper by combining perspectives from psycholinguistics and cognitive science.展开更多
Forensic image analysis has greatly developed with the proliferation of photography and video recording devices.Trace images of serious incidents are increasingly captured by first responders,witnesses,bystanders,or s...Forensic image analysis has greatly developed with the proliferation of photography and video recording devices.Trace images of serious incidents are increasingly captured by first responders,witnesses,bystanders,or surveillance systems.Image perception is exposed with a special emphasis on the influence of the field of view on observation.In response to the pitfalls of the mental eye,a way to systematize the integration of images as traces in three‑dimensional crime scene reconstruction is proposed.The systematic approach is based on the application of photogrammetric principles to slightly modify the usual photographic documentation as well as on the early collection and review of available trace images.The integration of images as traces provides valuable contributions to contextualize what happened at a crime scene based on the information that can be obtained from images.In a wider perspective,the systematic analysis of images fosters the use and interpretation of forensic evidence to complement witness statements in the criminal justice system.This article outlines the benefits of integrating trace images into a coherent reconstruction framework in order to improve interpretation of their content.A solution is proposed to integrate perception differences between the field of view of cameras and the human eye.展开更多
基金supported by the National Basic Research Program of China[grant number 2015CB953603]the National Natural Science Foundation of China[grant number 41371389].
文摘The false topographic perception phenomenon(FTPP)refers to the visual misperception in remote-sensing images that certain types of terrains are visually interpreted as other types in rugged lands,for example,valleys as ridges and troughs as peaks.For this reason,the FTPP can influence the visualization and interpretation of images to a great extent.To scrutinize this problem,the paper firstly reviews and tests the existing FTPP-correction techniques and identifies the inverse slope-matching technique as an effective approach to visually enhance remote-sensing images and retain the colour information.The paper then proposes an improved FTPP-correction procedure that incorporates other image-processing techniques(e.g.linear stretch,histogram matching,and flat-area replacement)to enhance the performance of this technique.A further evaluation of the proposed technique is conducted by applying the technique to various study areas and using different types of remote-sensing images.The result indicates the method is relatively robust and will be a significant extension to geovisual analytics in digital earth research.
文摘The terrain reversal effect is a perceptual phenomenon which causes an illusion in various 3D geographic visualizations where landforms appear inverted,e.g.we perceive valleys as ridges and vice versa.Given that such displays are important for spatio-visual analysis,this illusion can lead to critical mistakes in interpreting the terrain.However,it is currently undocumented how commonly this effect is experienced.In this paper,we study the prevalence of the terrain reversal effect in satellite imagery through a two-stage online user experiment.The experiment was conducted with the participation of a diverse and relatively large population(n=535).Participants were asked to identify landforms(valley or ridge?)or judge a 3D spatial relationship(is A higher than B?).When the images were rotated by 180°,the results were reversed.In a control task with‘illusion-free’original images,people were successful in identifying landforms,yet a very strong illusion occurred when these images were rotated 180°.Our findings demonstrate that the illusion is acutely present;thus,we need a better understanding of the problem and its solutions.Additionally,the results caution us that in an interactive environment where people can rotate the display,we might be introducing a severe perceptual problem.
基金the Swiss National Science Foundation(SNSF)project VISDOM,grant number 200021_149670/2.
文摘Terrain reversal effect(TRE)causes reversed 3D shape perception in satellite images and shaded relief maps(SRMs),and introduces difficulties in identifying landforms such as valleys and ridges.With this paper,in a controlled laboratory experiment,we compare how well 27 participants could identify valleys and ridges over 33 locations using SRMs,color satellite images and grayscale satellite images.The main depth cue is shadow both in vertical-view images and SRMs.However,the presence of texture and color in images also affect 3D shape perception.All our participants experience the illusion strongly:with the SRMs,it is very severe(2%accuracy),with grayscale images low but considerably better than SRMs(17.6%accuracy),and slightly worse with color imagery(15.3%accuracy).These differences between SRMs and imagery suggest that the participants who are able to bypass the illusion consciously or subconsciously interpret the photographic information.We support this observation further with a cue-strength analysis.Furthermore,we provide exploratory analyses of the effects of expertise,global convexity bias,and bistable perception.Our original empirical observations serve towards a better understanding of this visual illusion,and contribute towards nuanced and appropriate solutions to correcting for TRE differently for satellite images and SRMs.
文摘Source language perception is the beginning and also the most unobservable stage of interpretative activity. According to ESIT, it is the sense that constitutes a communicative intention. Sense cohort theory and requirement equation upon interpreter shall be presented in the paper by combining perspectives from psycholinguistics and cognitive science.
文摘Forensic image analysis has greatly developed with the proliferation of photography and video recording devices.Trace images of serious incidents are increasingly captured by first responders,witnesses,bystanders,or surveillance systems.Image perception is exposed with a special emphasis on the influence of the field of view on observation.In response to the pitfalls of the mental eye,a way to systematize the integration of images as traces in three‑dimensional crime scene reconstruction is proposed.The systematic approach is based on the application of photogrammetric principles to slightly modify the usual photographic documentation as well as on the early collection and review of available trace images.The integration of images as traces provides valuable contributions to contextualize what happened at a crime scene based on the information that can be obtained from images.In a wider perspective,the systematic analysis of images fosters the use and interpretation of forensic evidence to complement witness statements in the criminal justice system.This article outlines the benefits of integrating trace images into a coherent reconstruction framework in order to improve interpretation of their content.A solution is proposed to integrate perception differences between the field of view of cameras and the human eye.
