Recovering 3D human body configurations using shape contexts

Recovering 3D human body configurations using shape contexts Greg Mori & Jitendra Malik Presented by Joseph Vainshtein Winter 2007

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Motivation ,[object Object],[object Object]

Motivation – continued ,[object Object],[object Object],[object Object]

Goals ,[object Object],[object Object],[object Object],[object Object]

The Framework ,[object Object],[object Object]

The basic estimation algorithm - intuition ,[object Object],[object Object],Query image Database image

The basic estimation algorithm ,[object Object],[object Object],[object Object],[object Object]

The shape context ,[object Object],[object Object],[object Object]

Shape context (simple version) ,[object Object],Count = 4 Count = 10 Count the number of points in each histogram bin: ,[object Object]

Generalized shape context ,[object Object],[object Object],[object Object],[object Object]

The matching ,[object Object],[object Object],[object Object],[object Object]

The bipartite matching ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Points sampled from exemplar Points sampled from query image

[object Object],[object Object],[object Object],[object Object],The deformable matching ,[object Object]

The deformable matching – cont’d ,[object Object],[object Object],[object Object],[object Object],[object Object]

The deformation model – cont’d ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],The deformation model – cont’d

The deformation model – cont’d ,[object Object],[object Object],[object Object],[object Object]

The deformation model – cont’d ,[object Object],[object Object],[object Object]

A matching and deformation example Query image points Exemplar points ,[object Object]

A matching and deformation example Iteration 1 Iteration 3 Iteration 2 matching deformation ,[object Object]

Scaling to large exemplar databases ,[object Object],[object Object],[object Object],[object Object],[object Object]

Scaling to large exemplar databases ,[object Object],[object Object],[object Object],[object Object]

The pruning algorithm ,[object Object],[object Object],[object Object],[object Object]

The pruning algorithm – cont’d ,[object Object],[object Object],[object Object]

The pruning algorithm – cont’d ,[object Object],[object Object]

Selecting shortlist – example Query image Top 10 candidates ,[object Object]

Matching part exemplars - motivation ,[object Object],[object Object],[object Object]

Matching part exemplars - intuition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example of matching part exemplars ,[object Object]

Matching part exemplars – cont’d ,[object Object],[object Object],[object Object],[object Object],Points sampled from i th exemplar Points sampled from query image

Matching part exemplars – cont’d ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Matching part exemplars: consistency score ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Matching part exemplars: consistency score – cont’d ,[object Object],[object Object],[object Object]

Matching part exemplars: consistency score – cont’d ,[object Object],[object Object],[object Object],[object Object]

Matching part exemplars ,[object Object],[object Object],[object Object],Individual limb “fit score” Sum of consistency scores on all links

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Estimating 3D configuration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],We have obtained them in the algorithm from previous sections These are simply proportion of human body parts

Estimating 3D configuration – cont’d ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results of creating 3D model ,[object Object]

Questions ,[object Object],? ,[object Object]

Bibliography & credits ,[object Object],[object Object],[object Object],[object Object]

Recovering 3D human body configurations using shape contexts

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