Rendering techniques can improve spatial perception and orientation in 3D virtual environments but may reduce accuracy of point-wise value estimation of thematic data. An experiment evaluated different rendering techniques on tasks of mental mapping, distance estimation, and value estimation using color mappings in a 3D city model. Results showed that edge enhancement and abstracted façade textures improved mental mapping the most, while rendering techniques reduced accuracy for point estimates but increased it for area estimates. The impact of rendering techniques depends on the visualization task.
5 examples of implementation of the statistical design of experiments on visual appearance of materials, where the multi-scale approach, both top-down and bottom-up, are very important to be pro-active.
5 examples of implementation of the statistical design of experiments on visual appearance of materials, where the multi-scale approach, both top-down and bottom-up, are very important to be pro-active.
Color and 3D Semantic Reconstruction of Indoor Scenes from RGB-D streamNAVER Engineering
Despite recent successes of 3D reconstruction, the majority of researches mainly focus on acquiring the precise geometry.
Even though many computer graphics applications such as AR/VR need more than just scene geometry such as surface color and semantics to provide richer user experience, existing 3D reconstruction methods leave such auxiliary information behind their consideration.
This talk will present our two approaches to reconstruct color and semantic information of 3D indoor scenes as follow:
Junho Jeon, Yeongyu Jung, Haejoon Kim, Seungyong Lee, "Texture map generation for 3D reconstructed scenes", The Visual Computer (CGI 2016), Vol. 32, No. 5, May 2016.
Junho Jeon, Jinwoong Jung, Jungeon Kim, Seungyong Lee, "Semantic Reconstruction: Reconstruction of Semantically Segmented 3D Meshes via Volumetric Semantic Fusion", Computer Graphics Forum (Pacific Graphics 2018), Vol. 37, No. 7, October 2018.
AMIA 2015 Visual Analytics in Healthcare Tutorial Part 1David Gotz
A concise introduction to the topic of visualization. Designed for beginners with no prior experience with visualization. These slides were the first part of a half-day tutorial on Visual Analytics held in conjunction with the 2015 AMIA Annual Symposium. It was sponsored by the AMIA Visual Analytics Working Group. For more information, please see www.visualanalyticshealthcare.org or contact the author of the slides: David Gotz @ http://gotz.web.unc.edu
ICC2017 Washington http://icc2017.org/
6205.2
How hard is it to design maps for beginners, intermediates and experts?
Gáspár Albert
Eötvös Loránd Univerity
Computer Graphics Unit 5 notes for Manonmanium Sundaranar UniversityRajeswariR45
Computer graphic notes
Unit 5 notes
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Spectral and color prediction for arbitrary halftone patterns: a drop-by-drop...Peter Morovic
Accurately previewing the appearance of a print job can make the difference between producing saleable output and wast- ing expensive materials and is a challenge to which a host of solu- tions already exist. However, what the majority of these have in common is that they base their predictions on the inputs to a print- ing system (e.g., continuous-tone data in ink channels) instead of its outputs (i.e., the halftone data that is then printed) and that they are only valid for a given set of choices already made in the print- ing system (e.g., color separation and halftoning). Alternatively, attempting to make appearance predictions using general-purpose models such as Kubelka Munk, Yule Nielsen and Neugebauer re- sults in limited performance on systems whose behavior diverges from these models’ assumptions, such as inkjet printing. As a result of such constraints, the resulting previews either work only under limited conditions or fail to predict some artifacts while erroneous- ly predicting others that do not materialize in print. The approach presented here takes advantage of the flexibility of the HANS framework and the insights into spectral correlation to deliver a print preview solution that can be applied to any printing system, that allows for the variation of fundamental imaging choices with- out the need for re-computing model parameters and that delivers ICC-profile-level accuracy.
Interactive Control over Temporal Consistency while Stylizing Video StreamsMatthias Trapp
Presentation of the research paper "Interactive Control over Temporal Consistency while Stylizing Video Streams" at the 34th Eurographics Symposium on Rendering (EGSR 2023) in Delft, Netherlands.
A Framework for Art-directed Augmentation of Human Motion in Videos on Mobile...Matthias Trapp
Presentation of the research contribution "A Framework for Art directed Augmentation of Human Motion in Videos on Mobile Devices" at the 31. International Conference on Computer Graphics, Visualization and Computer Vision (WSCG 2023).
More Related Content
Similar to Evaluating the Perceptual Impact of Rendering Techniques on Thematic Color Mappings in 3D Virtual Environments
Color and 3D Semantic Reconstruction of Indoor Scenes from RGB-D streamNAVER Engineering
Despite recent successes of 3D reconstruction, the majority of researches mainly focus on acquiring the precise geometry.
Even though many computer graphics applications such as AR/VR need more than just scene geometry such as surface color and semantics to provide richer user experience, existing 3D reconstruction methods leave such auxiliary information behind their consideration.
This talk will present our two approaches to reconstruct color and semantic information of 3D indoor scenes as follow:
Junho Jeon, Yeongyu Jung, Haejoon Kim, Seungyong Lee, "Texture map generation for 3D reconstructed scenes", The Visual Computer (CGI 2016), Vol. 32, No. 5, May 2016.
Junho Jeon, Jinwoong Jung, Jungeon Kim, Seungyong Lee, "Semantic Reconstruction: Reconstruction of Semantically Segmented 3D Meshes via Volumetric Semantic Fusion", Computer Graphics Forum (Pacific Graphics 2018), Vol. 37, No. 7, October 2018.
AMIA 2015 Visual Analytics in Healthcare Tutorial Part 1David Gotz
A concise introduction to the topic of visualization. Designed for beginners with no prior experience with visualization. These slides were the first part of a half-day tutorial on Visual Analytics held in conjunction with the 2015 AMIA Annual Symposium. It was sponsored by the AMIA Visual Analytics Working Group. For more information, please see www.visualanalyticshealthcare.org or contact the author of the slides: David Gotz @ http://gotz.web.unc.edu
ICC2017 Washington http://icc2017.org/
6205.2
How hard is it to design maps for beginners, intermediates and experts?
Gáspár Albert
Eötvös Loránd Univerity
Computer Graphics Unit 5 notes for Manonmanium Sundaranar UniversityRajeswariR45
Computer graphic notes
Unit 5 notes
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Computer Graphics Unit 5 notes for Manonmanium Sundaranar University
Spectral and color prediction for arbitrary halftone patterns: a drop-by-drop...Peter Morovic
Accurately previewing the appearance of a print job can make the difference between producing saleable output and wast- ing expensive materials and is a challenge to which a host of solu- tions already exist. However, what the majority of these have in common is that they base their predictions on the inputs to a print- ing system (e.g., continuous-tone data in ink channels) instead of its outputs (i.e., the halftone data that is then printed) and that they are only valid for a given set of choices already made in the print- ing system (e.g., color separation and halftoning). Alternatively, attempting to make appearance predictions using general-purpose models such as Kubelka Munk, Yule Nielsen and Neugebauer re- sults in limited performance on systems whose behavior diverges from these models’ assumptions, such as inkjet printing. As a result of such constraints, the resulting previews either work only under limited conditions or fail to predict some artifacts while erroneous- ly predicting others that do not materialize in print. The approach presented here takes advantage of the flexibility of the HANS framework and the insights into spectral correlation to deliver a print preview solution that can be applied to any printing system, that allows for the variation of fundamental imaging choices with- out the need for re-computing model parameters and that delivers ICC-profile-level accuracy.
Similar to Evaluating the Perceptual Impact of Rendering Techniques on Thematic Color Mappings in 3D Virtual Environments (20)
Interactive Control over Temporal Consistency while Stylizing Video StreamsMatthias Trapp
Presentation of the research paper "Interactive Control over Temporal Consistency while Stylizing Video Streams" at the 34th Eurographics Symposium on Rendering (EGSR 2023) in Delft, Netherlands.
A Framework for Art-directed Augmentation of Human Motion in Videos on Mobile...Matthias Trapp
Presentation of the research contribution "A Framework for Art directed Augmentation of Human Motion in Videos on Mobile Devices" at the 31. International Conference on Computer Graphics, Visualization and Computer Vision (WSCG 2023).
A Framework for Interactive 3D Photo Stylization Techniques on Mobile DevicesMatthias Trapp
Presentation of paper "Trios - A Framework for Interactive 3D Photo Stylization on Mobile Devices" presented at the International Conference on Graphics and Interaction (IGCI 2022) in Aveiro, Portugal.
ALIVE-Adaptive Chromaticity for Interactive Low-light Image and Video Enhance...Matthias Trapp
Presentation of the research contribution "ALIVE: Adaptive Chromaticity for Interactive Low-light Image and Video Enhancement" at the 31. International Conference on Computer Graphics, Visualization and Computer Vision (WSCG 2023).
A Service-based Preset Recommendation System for Image Stylization ApplicationsMatthias Trapp
Presentation of research paper "A Service-based Preset Recommendation System for Image Stylization Applications" at the "7th International Conference on Human-Computer Interaction Theory and Applications (HUCAPP 2023)".
Design Space of Geometry-based Image Abstraction Techniques with Vectorizatio...Matthias Trapp
Presentation of paper "Design Space of Geometry-based Image Abstraction Techniques with Vectorization Applications" presented at the 30th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2022).
A Benchmark for the Use of Topic Models for Text Visualization Tasks - Online...Matthias Trapp
Presentation of research paper "A Benchmark for the Use of Topic Models for Text Visualization Tasks" at the 15th International Symposium on Visual Information Communication and Interaction in Chur, Switzerland.
Efficient GitHub Crawling using the GraphQL APIMatthias Trapp
Presentation of the research paper "Efficient GitHub Crawling using the GraphQL API" at the 22nd International Conference on Computational Science and Its Applications in Malaga, Spain.
CodeCV - Mining Expertise of GitHub Users from Coding Activities - Online.pdfMatthias Trapp
Presentation of research paper "CodeCV: Mining Expertise of GitHub Users from Coding Activities" at the 22nd IEEE International Working Conference on Source Code Analysis and Manipulation in Limassol, Cyprus.
Interactive Close-Up Rendering for Detail+Overview Visualization of 3D Digita...Matthias Trapp
Presentation of Research Paper "Interactive Close-Up Rendering for Detail+Overview Visualization of 3D Digital Terrain Models" at 23rd International Conference on Information Visualisation (IV 2019) in Paris, France.
Visualization of Knowledge Distribution across Development Teams using 2.5D S...Matthias Trapp
Presentation of research paper "Visualization of Knowledge Distribution across Development Teams using 2.5D Semantic Software Maps" at 13th International Conference on Information Visualization Theory and Applications (IVAPP 2022).
Real-time Screen-space Geometry Draping for 3D Digital Terrain ModelsMatthias Trapp
Presentation of Research Paper "Real-time Screen-space Geometry Draping for 3D Digital Terrain Models" at 23rd International Conference on Information Visualisation (IV 2019) in Paris, France.
FERMIUM - A Framework for Real-time Procedural Point Cloud Animation & MorphingMatthias Trapp
Presentation of research paper FERMIUM: A Framework for Real-time Procedural Point Cloud Animation & Morphing at 26th International Symposium on Vision, Modeling, and Visualization (VMV 2021).
Interactive Editing of Signed Distance FieldsMatthias Trapp
Presentation of paper "Interactive Editing of Voxel-Based Signed Distance Fields" presented at the 30th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2022).
Integration of Image Processing Techniques into the Unity Game EngineMatthias Trapp
Presentation of the research paper "Integration of Image Processing Techniques into the Unity Game Engine" at the 1st International Conference on Image Processing and Vision Engineering (IMPROVE 2021).
Interactive GPU-based Image Deformation for Mobile DevicesMatthias Trapp
Presentation of research paper "Interactive GPU-based Image Deformation for Mobile Devices" at Computer Graphics and Visual Computing (CGVC 2016) in Bournemouth University, United Kingdom.
Interactive Photo Editing on Smartphones via Intrinsic DecompositionMatthias Trapp
Presentation of research paper "Interactive Photo Editing on Smartphones via Intrinsic Decomposition" presented at 42nd Annual Conference of the European Association for Computer Graphics (Eurographics’2021).
Goodbye Windows 11: Make Way for Nitrux Linux 3.5.0!SOFTTECHHUB
As the digital landscape continually evolves, operating systems play a critical role in shaping user experiences and productivity. The launch of Nitrux Linux 3.5.0 marks a significant milestone, offering a robust alternative to traditional systems such as Windows 11. This article delves into the essence of Nitrux Linux 3.5.0, exploring its unique features, advantages, and how it stands as a compelling choice for both casual users and tech enthusiasts.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024Neo4j
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
Leonard Jayamohan, Partner & Generative AI Lead, Deloitte
This keynote will reveal how Deloitte leverages Neo4j’s graph power for groundbreaking digital twin solutions, achieving a staggering 100x performance boost. Discover the essential role knowledge graphs play in successful generative AI implementations. Plus, get an exclusive look at an innovative Neo4j + Generative AI solution Deloitte is developing in-house.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...
Evaluating the Perceptual Impact of Rendering Techniques on Thematic Color Mappings in 3D Virtual Environments
1. Evaluating the Perceptual Impact of Rendering Techniques on
Thematic Color Mappings in 3D Virtual Environments
18th International Workshop on Vision, Modeling and Visualization
Juri Engel Amir Semmo Matthias Trapp Jürgen Döllner
Hasso-Plattner-Institut, Potsdam, Germany
2. 1) Motivation 2) Rendering Techniques 3) User Study
4) Results 5) Conclusions 6) Questions
3. • Using color maps to communicate information is a fundamental approach in visualization
• In 3D virtual environments surface-based data is usually visualized using color-encoded surface textures
Air flow at the surface of a cooling jacket [R.S. Laramee, 2004] Deformation of the colon between two CT scans [W. Zeng, 2004]
4. • Virtual 3D city models communicate geospatial information by means of virtual 3D worlds
• Thematic data is an integral part of geospatial data along geometry, topology, semantics, and appearance
• For example, results of a solar potential, crime, or heat transmission analysis may be mapped to colors
Object semantic Visibility Solar potential
5. • Huge amount of objects
• Objects need to be visually
distinguished
• Most surfaces are flat
• Appearance and
microstructure is usually
modeled with textures
• Appearance is highly
important for the recognition
of landmarks and orientation
6. • 1.8 km² central urban area of
Berlin, Germany
• Solar radiation summed up
over a year
• Considering surface
orientation and shadowing
• Continuous surface
information
• Precomputed and stored in a
texture atlas
• Values: 0-no radiation; 1-
maximum radiation
7. • Objects can hardly be distinguished because of missing monocular depth cues
• Appearance and microstructure information is lost
8. • Depth Cues
• Enable the perception of 2D images as three dimensional
• Essential for mental modeling to estimate distance, relative position, object size and shape
• Monocular depth cues: linear perspective, relative size, texture gradient, occlusion, shading, shadows, areal
perspective, and defocus blur [J. D. Pfautz, 2000]
• Rendering Techniques for Depth-Cue Enhancement
• Edge Enhancement
• Global Illumination
(Ambient Occlusion)
• Local Illumination
(Blinn-Phong Shading)
• Abstracted façade textures
9. • Depth Cues
• Enable the perception of 2D images as three dimensional
• Essential for mental modeling to estimate distance, relative position, object size and shape
• Monocular depth cues: linear perspective, relative size, texture gradient, occlusion, shading, shadows, areal
perspective, and defocus blur [J. D. Pfautz, 2000]
• Rendering Techniques for Depth-Cue Enhancement
• Edge Enhancement
• Global Illumination
(Ambient Occlusion)
• Local Illumination
(Blinn-Phong Shading)
• Abstracted façade textures
10. • Depth Cues
• Enable the perception of 2D images as three dimensional
• Essential for mental modeling to estimate distance, relative position, object size and shape
• Monocular depth cues: linear perspective, relative size, texture gradient, occlusion, shading, shadows, areal
perspective, and defocus blur [J. D. Pfautz, 2000]
• Rendering Techniques for Depth-Cue Enhancement
• Edge Enhancement
• Global Illumination
(Ambient Occlusion)
• Local Illumination
(Blinn-Phong Shading)
• Abstracted façade textures
11. • Depth Cues
• Enable the perception of 2D images as three dimensional
• Essential for mental modeling to estimate distance, relative position, object size and shape
• Monocular depth cues: linear perspective, relative size, texture gradient, occlusion, shading, shadows, areal
perspective, and defocus blur [J. D. Pfautz, 2000]
• Rendering Techniques for Depth-Cue Enhancement
• Edge Enhancement
• Global Illumination
(Ambient Occlusion)
• Local Illumination
(Blinn-Phong Shading)
• Abstracted façade textures
12. • Color information is altered, which may lead to ambiguity in the interpretation of a color mapping
• Each rendering technique has a different impact
• Goal for visualization design: reduce information ambiguity while still preserving depth cues
13. • To which degree improve rendering techniques the orientation in 3D and creation of mental maps?
• Do they improve the perception and estimation of distances?
• Do they alter the perception of the visualized thematic data?
• Perform certain rendering techniques better for thematic visualization than others?
• Does a combination of rendering techniques always improves the orientation and distance estimation?
→ We performed a quantitative and qualitative user study to objectively compare and evaluate the
different rendering techniques
→ The purpose of this study was to determine if there is a significant main effect on the rendering
techniques and color mappings
16. 1. All rendering techniques would improve the spatial perception and, thus, would reduce task time
and error rate for mental mapping and distance estimation.
2. The estimation of thematic values would be more difficult with any rendering technique and would
result in higher error rates and task completion times.
3. There would be significant main effects between color mappings and the tasks’ completion times and
error rates.
4. There would be a distinct order of rendering techniques and color mappings for each task.
5. Compared to individual rendering techniques, a combination would improve the participants’
performance in task 1 and 2 but increase the error rate in task 3 and 4.
17. • Evaluated different color maps to have more generalized results
• Single hue: only saturation as visual variable
• Black body radiation (BBR): hue, saturation, and luminance as visual variables
(Luminance can interfere with the output of rendering techniques)
• Diverging: saturation as variable and two hues that can be easily correlated with high and low value, neutral midpoint
19. • Within subjects design 4×3×8
(task × color mapping ×
rendering technique) = 96 trials
• Additional trial in the
beginning for practicing
• Task and trial order were
randomized to avoid sequence
effects
• Questionnaire for usefulness of
each rendering technique after
completion of each task
• 21 participants (17 male, age
21-49, 19 from campus)
• Average completion time:
40 minutes
20. • Each rendering technique reduced the time required for
orientation over a plain color mapping
• Using abstracted façade textures resulted in the best
performance increase
Rendering techniques: (0) none, (1) Blinn-Phong shading, (2) SSAO, (3) edge enhancement (EE), (4) abstracted facade textures (AFT), (5) Blinn-Phong shading + SSAO, (6) SSAO + AFT, (7) AFT + EE
21. • Applying the examined rendering techniques didn’t result in a
performance improvement
• Participants had difficulties to overview all marked points
→Abstracted façade textures are prone to create visual clutter
Rendering techniques: (0) none, (1) Blinn-Phong shading, (2) SSAO, (3) edge enhancement (EE), (4) abstracted facade textures (AFT), (5) Blinn-Phong shading + SSAO, (6) SSAO + AFT, (7) AFT + EE
22. • As expected, each rendering technique reduced the accuracy of
a point-wise value estimation
• Local illumination showed to be least suitable for an accurate
point-wise value estimation
Rendering techniques: (0) none, (1) Blinn-Phong shading, (2) SSAO, (3) edge enhancement (EE), (4) abstracted facade textures (AFT), (5) Blinn-Phong shading + SSAO, (6) SSAO + AFT, (7) AFT + EE
23. • Surprisingly, each rendering technique increased the accuracy of
area-wise value estimation
• Edge enhancement showed to be the most suited technique for
an accurate area-wise value estimation
Rendering techniques: (0) none, (1) Blinn-Phong shading, (2) SSAO, (3) edge enhancement (EE), (4) abstracted facade textures (AFT), (5) Blinn-Phong shading + SSAO, (6) SSAO + AFT, (7) AFT + EE
24. • Color mapping has a significant effect on value
estimation in 3D virtual environments
• For the mental mapping task the average
completion time using the BBR was 15.1%
longer than using the other two color mappings
• The combination of different techniques shows
no pattern compared to the individual ones
regarding performance
25. • Participants rating: 0-not useful at all, 7-absolutely useful
• Edge enhancement was perceived as the most helpful rendering technique
• Abstract façade textures were perceived helpful for spatial tasks
• Effect of abstract façade textures was underestimated for value estimation tasks.
26. • Rendering techniques can be used to improve mental mapping and orientation in a thematic visualization
• The examined rendering techniques alter the perception of visualized data
• Whereby they reduce the accuracy of a point-wise value estimation
• Color mappings have a significant effect on the perception of thematic data in 3D virtual environments
27. • Rendering techniques can increase
the accuracy of an area-wise value
estimation
• Attention should be paid to visual
clutter
• There was no clear order of
rendering techniques among all tasks
• A combination of multiple
techniques was not necessarily
better than single techniques
→ The used rendering technique
should be chosen according to the
visualization needs
Rendering Technique Mental
Mapping /
Orientation
Distance
Estimation
Point-Wise
Value
Estimation
Area-wise
Value
Estimation
None – + –
Blinn-Phong Shading –
SSAO
Edge enhancement +
Abstracted façade
textures (AFT)
+ –
Blinn-Phong + SSAO –
SSAO + AFT –
Edge enhancement +
AFT
–
28. • Evaluation with color mappings for different data sets
• Follow-up evaluation of edge enhancement for area-wise value estimations
• View-dependent combination of rendering techniques for depth-cue enhancement (e.g., view-distance
based or focus+context visualization)
• Generalization scheme for color-encoded thematic data to reduce visual clutter
29. Thank You For Your Attention!
• Juri Engel
juri.engel@hpi.uni-potsdam.de
• Amir Semmo
amir.semmo@hpi.uni-potsdam.de
• Computer Graphics Group
Prof. Dr. Jürgen Döllner
hpi3d.de youtube.com/hpicgs @hpi3d