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Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and J. Malik. IEEE TPAMI 2011. Contour Detection and Hierarchical Image Segmentation
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Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

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Page 1: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Islam Beltagy

P. Arbelaez, M. Maire, C. Fowlkes, and J. Malik. IEEE TPAMI 2011.

Contour Detection andHierarchical Image Segmentation

Page 2: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Outline

Introduction

Contour Detection

Hierarchical Segmentation

Results and Evaluation

Discussion

Page 3: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Contours (Ground Truth BSDS500)

Contour

Page 4: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Segmentation (Ground Truth-BSDS500)

Page 5: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Goal• Contour Detection• Segmentation from Contours

Original Image SegmentationContour

Page 6: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Outline

Introduction

Contour Detection

Hierarchical Segmentation

Results and Evaluation

Discussion

Page 7: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Contours Detection

Original Image Contour = Pr(x, y, Ο)

Page 8: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

• Circular disk around (x, y) with orientation θ• Histograms of Intensities in both halves• �Chi Square distance between the two histograms • Three scales of r and eight values for θ

Contour Detection-Oriented gradient of histograms

Page 9: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

•Extract different channels• Brightness L, Color a, Color b

• Components of CIE Lab colorspace

• Texture

Contour Detection

Convolve

K-mean clustering

Replace pixel with cluster index

http://www.cs.berkeley.edu/~malik/papers/LM-3dtexton.pdf

Page 10: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

• Local Cues CombinationContour Detection

Scale: 3 different values for the disc diameterα: learned from training data

max

Page 11: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

• GlobalizationContour Detection

Eigen Values

Normalized Cuts

Affinity Matrix Apply filters

then sum

Page 12: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Outline

Introduction

Contour Detection

Hierarchical Segmentation

Results and Evaluation

Discussion

Page 13: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Uncertainty in Segmentation

Hierarchical Segmentation

Page 14: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Hierarchical Segmentation Oriented Watershed Transform

Ultrametric Contour Map

Page 15: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Oriented Watershed Transform•Watershed Transform

http://cmm.ensmp.fr/~beucher/wtshed.html

Page 16: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Oriented Watershed Transform•Watershed Transform

Artifacts

Weight each arc

Page 17: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Oriented Watershed Transform

WTOWT

Fitting lines

Weight arcs according to orientation

Page 18: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Hierarchical Segmentation• Ultrametric Contour Map - Iterative Merging

Page 19: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Brief Summary

Original Image

Oriented Gradientof histograms

Contour

Oriented Watershed TransformUltrametric Contour Map

Hierarchical Segmentation

Threshold

Page 20: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Outline

Introduction

Contour Detection

Hierarchical Segmentation

Results and Evaluation

Discussion

Page 21: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Result (BSDS500 dataset)

Left to Right: Image, gPb-owt-ucm, threshold = optimal dataset scale, threshold = optimal picture scale

Page 22: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Result

Evaluation of segmentation algorithmsEvaluation of contour detector

• BSDS300 Dataset

Page 23: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Region benchmarks(2)Covering Rand Index Variation of Information

-ODS: optimal dataset scale

-OIS: optimal image scale

Page 24: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Outline

Introduction

Contour Detection

Hierarchical Segmentation

Results and Evaluation

Discussion

Page 25: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Discussion

What enforces closure in OWT-UCM for all

possible thresholds?

Page 26: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Discussion How to define ground truth ?

Can we use Hierarchal segmentation ?

Page 27: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Discussion OIS and the different possible segmentations

below, what do they suggest ?

Page 28: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Interactive Segmentation

1

Page 29: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Discussion Contours vs Segments.

Page 30: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Reference• P. Arbelaez, M. Maire, C. Fowlkes and J. Malik. Contour Detection

and Hierarchical Image Segmentation. IEEE TPAMI, Vol. 33, No. 5, pp. 898-916, May 2011

• P. Arbelaez, M. Maire, C. Fowlkes and J. Malik. From Contours to Regions: An Empirical Evaluation. In CVPR 2009.

• P. Arbelaez and L. Cohen. Constrained Image Segmentation from Hierarchical Boundaries. In CVPR 2008.

Page 31: Contour Detection and Hierarchical Image Segmentationcv-fall2012/slides/islam-paper.pdf · Original slides from: Hsin-Min Cheng Islam Beltagy P. Arbelaez, M. Maire, C. Fowlkes, and

Original slides from: Hsin-Min Cheng http://archer.ee.nctu.edu.tw/powerpoint/GM_1024.pptx

Thanks