Context and Spatial Layout
Computer Vision
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Context and Spatial Layout - Introduction to Computer Version - Lecture Sli, Lecture notes of Computer Science
These are the Lecture Slides of Introduction to Computer Version which includes Machine Learning, Framework, Prediction Function, Feature Representation, Image, Desired Output, Prediction Function, Prediction Error, Predicted Value etc. Key important points are: Context and Spatial Layout, Context In Recognition, Surrounded, Provide Context, Scene Category, Surfaces, Context Provides, Function, Component of Recognition, Context
Typology: Lecture notes
2012/2013
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Context and Spatial Layout
Computer Vision
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Context in Recognition
• Objects usually are surrounded by a scene
that can provide context in the form of nearby
objects, surfaces, scene category, geometry,
etc.
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Context provides clues for function
• What is this?
• Now can you tell?
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Sometimes context is the major
component of recognition
- What is this?
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More Low-Res
• What are these blobs?
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More Low-Res
• The same pixels! (a car)
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There are many types of context
- Local pixels
- window, surround, image neighborhood, object boundary/shape, global image statistics
- 2D Scene Gist
- global image statistics
- 3D Geometric
- 3D scene layout, support surface, surface orientations, occlusions, contact points, etc.
- Semantic
- event/activity depicted, scene category, objects present in the scene and their spatial extents, keywords
- Photogrammetric
- camera height orientation, focal length, lens distortion, radiometric, response function
- Illumination
- sun direction, sky color, cloud cover, shadow contrast, etc.
- Geographic
- GPS location, terrain type, land use category, elevation, population density, etc.
- Temporal
- nearby frames of video, photos taken at similar times, videos of similar scenes, time of capture
- Cultural
- photographer bias, dataset selection bias, visual cliches, etc.
from Divvala et al. CVPR 2009Docsity.com
Cultural context
Jason Salavon: http://salavon.com/SpecialMoments/Newlyweds.shtml Docsity.com
Cultural context
Andrew Gallagher: http://chenlab.ece.cornell.edu/people/Andy/projectpage_names.html
Age given Appearance Age given Name
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Spatial layout is especially important
1. Context for recognition
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Spatial layout is especially important
1. Context for recognition
2. Scene understanding
Slide: Derek HoiemDocsity.com
Slide: Derek Hoiem
Spatial layout is especially important
1. Context for recognition
2. Scene understanding
3. Many direct applications
a) Assisted driving
b) Robot navigation/interaction
c) 2D to 3D conversion for 3D TV
d) Object insertion
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