Information Processing:
Top-Down vs. Bottom-Up
Ishan Misra, Wentao Liu
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Other examples of top-down in vision o single view geometry. Images from Hoiem et al., ICCV 2005; Hedau et al., ICCV 2009 ...
Typology: Schemes and Mind Maps
2022/2023
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Information Processing:
Top-Down vs. Bottom-Up
Ishan Misra, Wentao Liu
So far: bottom up processing
From previous lecture slide
Does this mean no top-down?
• Specific regions handle specific information
• Seems to be an entirely feed-forward
process?
• Dorsal and ventral streams seem to move
only in one direction
But humans use top down
Multiple personalities of a blob - Antonio Torralba
Examples from vision
Top Down vs. Bottom up in vision
Image Segmentation Bottom up - pixel based Top down - transfer mask to detections
- Learning to Combine Bottom-Up and Top-Down Segmentation - A. Levin, Y. Weiss, ECCV
How can we use top-down?
Context
Multiple personalities of a blob - Antonio Torralba
How can we model contextual
associations?
Representation for context
Associate objects with
• Categories
• Prototypes
• Exemplars
Why we need categories
Associations
Ask not what it is but what it is like
- Moshe Bar