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Stas Goferman Lihi Zelnik-Manor Ayellet Tal. …

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Presentation on theme: "Stas Goferman Lihi Zelnik-Manor Ayellet Tal. …"— Presentation transcript:

1 Stas Goferman Lihi Zelnik-Manor Ayellet Tal

2

3

4  Man in a flower field  In the fields  Spring blossom

5

6  Olympic weight lifter  Olympic victory  Olympic achievement

7  Man in a flower field  In the fields  Spring blossom  Olympic weight lifter  Olympic victory  Olympic achievement

8  Man in a flower field  In the fields  Spring blossom  Olympic weight lifter  Olympic victory  Olympic achievement

9 Following perceptual properties

10  Local low-level factors Contrast Color

11 [Walther and Koch, Neural Networks 2006]

12  Local low-level factors Contrast Color Walther & Koch, 2006

13  Global considerations Maintain unique features

14 [Hou & Zhang CVPR 2007]

15  Global considerations Maintain unique features Hou & Zhang, 2007

16  Local & global

17 InputMulti-scale contrast Center surround ColorFinal [Liu et al, CVPR 2007]

18  Local & global Liu et al, 2007

19  Visual organization (Gestalt) Few centers of gravity [Koffka] Position is important!!

20  High-level Faces Objects People … [Judd et al, ICCV 2009] Low-level With face detection

21 Our result

22 Local Walther & Koch, 2006 Global Hou & Zhang, 2007 Local + global Liu et al, 2007

23 The steps of our algorithm

24  Principles 1-2: Unique appearance  salient salient Not salient

25  Principles 1-2: Unique appearance  salient

26  Principles 1-2: Unique appearance  salient Euclidean distance between colors of patches at p i & p j

27  Principles 1-2: Unique appearance  salient high salient

28  Principle 3: Position is important! Similar patches both near and far Not salient

29  Principle 3: Position is important! Similar patches near Salient

30  Principle 3: Position is important! Normalized Euclidean distance between positions of p i & p j

31  Distance between a pair of patches: salient High

32  Distance between a pair of patches: salient High for K most similar

33 K most similar patches at scale r

34

35  Salient at: Multiple scales  foreground Few scales  background Scale 1Scale 4

36  Principle 3: Few centers of gravity Context

37 X Final result Focus points Distance map

38  Single-scale saliency  Multiple scales  Final saliency X

39

40 Walther & Koch, 2006Hou & Zhang, 2007 Our result

41 Walther & Koch, 2006Hou & Zhang, 2007 Our result

42 Walther & Koch, 2006Hou & Zhang, 2007 Our result

43 Walther & Koch, 2006Hou & Zhang, 2007 Our result

44 Walther & Koch, 2006Hou & Zhang, 2007 Our result

45 Walther & Koch, 2006Hou & Zhang, 2007 Our result

46 Database of Hou & Zhang

47 Our Our + center Judd

48 Our Our + center Judd

49

50 InputOur resultBoiman & Irani

51 InputOur resultBoiman & Irani

52 Image resizing

53 Liu et al, 2007 Our result

54 Seam CarvingOur result Liu et al [Avidan et al, SIGGRPH’07]

55 Seam CarvingOur result [Avidan et al, SIGGRPH’07]

56 Seam CarvingOur result [Avidan et al, SIGGRPH’07]

57 Combines local & global saliency Incorporates perceptual considerations State-of-the-art results Code is available

58 Long run-time (~30 sec for 250x250 pixels) Repetitive texture is totally eliminated Can we control how much context is included?

59 Can it be extended to video? Is there a faster implementation

60


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