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MediaEval Hyperlinking
Carles Ventura
Marcel Tella
Xavier Giró-i-Nieto

Barcelona, Catalonia
18th October 2013
Challenge
Visual Features

SURF descriptors
[Bay et al, CVIU 2008]
Visual Features
Bag of Features [Sivic & Zisserman, 2003]

Figure: Fergus, ICCV 2009
Visual Features
Histogram intersection
Approach
Shot
boundaries
Context

Anchor

Query video

Context
Approach

...

...
Keyframe 1 ranked list

Keyframe 2 ranked list
Approach
...

...

...

Fused ranked list of keyframes
Approach
...

Linked segments
Results
MAP

P@5

P@10

P@20

No context 0.0282 0.2600 0.2000 0.1233
Context

0.0260 0.2400 0.1967 0.1217
Conclusions
●

First MediaEval participation completed.

●

Visual alone is useful, but not enough.

●

1.2M keyframes is ...
Poster
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UPC at MediaEval Hyperlinking 2013 Slide 1 UPC at MediaEval Hyperlinking 2013 Slide 2 UPC at MediaEval Hyperlinking 2013 Slide 3 UPC at MediaEval Hyperlinking 2013 Slide 4 UPC at MediaEval Hyperlinking 2013 Slide 5 UPC at MediaEval Hyperlinking 2013 Slide 6 UPC at MediaEval Hyperlinking 2013 Slide 7 UPC at MediaEval Hyperlinking 2013 Slide 8 UPC at MediaEval Hyperlinking 2013 Slide 9 UPC at MediaEval Hyperlinking 2013 Slide 10 UPC at MediaEval Hyperlinking 2013 Slide 11 UPC at MediaEval Hyperlinking 2013 Slide 12
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Joint work with Carles Ventura and Marcel Tella.

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UPC at MediaEval Hyperlinking 2013

  1. 1. MediaEval Hyperlinking Carles Ventura Marcel Tella Xavier Giró-i-Nieto Barcelona, Catalonia 18th October 2013
  2. 2. Challenge
  3. 3. Visual Features SURF descriptors [Bay et al, CVIU 2008]
  4. 4. Visual Features Bag of Features [Sivic & Zisserman, 2003] Figure: Fergus, ICCV 2009
  5. 5. Visual Features Histogram intersection
  6. 6. Approach Shot boundaries Context Anchor Query video Context
  7. 7. Approach ... ... Keyframe 1 ranked list Keyframe 2 ranked list
  8. 8. Approach ... ... ... Fused ranked list of keyframes
  9. 9. Approach ... Linked segments
  10. 10. Results MAP P@5 P@10 P@20 No context 0.0282 0.2600 0.2000 0.1233 Context 0.0260 0.2400 0.1967 0.1217
  11. 11. Conclusions ● First MediaEval participation completed. ● Visual alone is useful, but not enough. ● 1.2M keyframes is challenging, video is more. ● Visual performance can be improved with: ○ spatial coding ○ larger vocabulary ○ face / concept detectors
  12. 12. Poster

Joint work with Carles Ventura and Marcel Tella. More details:

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