Segmentation of heterogeneous document images : an ... - Tel

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[105] A. Zahour, B. Taconet, L. Likforman-Sulem, and W. Boussellaa. Overlapping and multi-touching text-line segmentation by block covering analysis. Pattern Analysis and Applications, 12(4):335–351, July 2009. tel-00912566, version 1 - 2 Dec 2013 126
Index tel-00912566, version 1 - 2 Dec 2013 ABBYY FineReader, 2 Active contour model, 26 AdaBoost, 46 Adaptive local connectivity, 27 Aletheia, 11 Anisotropic Gaussian, 31 Auto correlation, 18 B-spline wavelets, 20 Belief propagation, 70 Binary partition tree, 100, 101 Boosted decision trees, 46 Boosting, 46 Bottom-up approach, 18 Branch-and-bound algorithm, 20 Camera-captured, 20, 21, 24, 26 CAMSHIFT, 17 Classifier selection, 45 Co-occurrence matrices, 17 Conditional random fields, 53 Connected components analysis, 5 Constrained run-length algorithm, 19 Cross-validation, 45 D-spline wavelets, 20 De-warping contest, 26 Delaunay triangulation, 26 Delauney tessellation, 18 Dempster-Shafer theory, 17 Diagonal run-lengths, 16 Distance-based region detection, 18, 19 Docstrum, 18, 19 Document image analysis, 2 Document page segmentation, 3 Dynamic programming, 56 Emission probability, 92 Feature analysis, 44 Feature correlation, 45 Feature functions, 56, 62 Feature relevance, 45 Filter bank, 26 Forward-backward algorithms, 71 Frequency features, 17 Fuzzy C-means classifier, 29 Gabor filtering, 60 Gaussian probability density, 29 Gaussian smoothing, 26 GentleBoost, 46 Geometric layout analysis, 3 Geometrical features, 16 Global projections, 27 Gradient vector flow, 26 Ground truth, 8 Handwritten text line detection, 27 Height and width maps, 58 Hessian matrix, 71 Hidden Markov Models, 29, 53, 88 Highly curled text lines, 26 hOCR, 98 Horn-Riley based ridge detection, 26 Hough transform, 14, 30 Hu-moments, 44 Image binarization, 5 Image pyramids, 17 Information gain, 44 Iterated Conditional Models, 68 K-means clustering, 20 K-nearest neighbors, 19 L-BFGS, 71 Label decoding, 56, 66 Level-set methods, 32 LogitBoost classifier, 46 Loopy belief propagation, 68, 70 Marginal inference, 55 Markov random fields, 18, 20, 21 127
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tel-00912566, version 1 - 2 Dec 201
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Resumé La segmentation de page est
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Acknowledgements This work would no
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4.3.2 Text components . . . . . . .
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3.6 Two documents that have obtaine
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6.1 PARAGRAPH DETECTION SUCCESS RAT
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detection and we conclude that the
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Figure 1.8: A screen shot that show
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Chapter 2 Related work tel-00912566
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them. In such circumstances, it wou
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[21] is another texture-based metho
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Figure 2.4: Part of a document in o
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• Degraded quality due to ageing
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2.3.2 Handwritten text line detecti
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(a) Divided strips and their projec
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(a) Five zones 1-5 (b) Projection p
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would be difficult to draw a conclu
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The proposed methods by Xiao [102],
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is assigning a label to a region of
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fixed range. When the elongation ap
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The second method calculates the co
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3. Repeat for m = 1, 2, ..., M •
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Chapter 4 Region detection tel-0091
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The next advantage of using CRFs is
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weights that are assigned to edge a
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{ 1 if ys = text and y f 1 (y s , y
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(a) Document (b) Filled text compon
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f = [y c = 0] × [y tl = 0] f = [y
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(a) Ground-truth (b) y c = 0 tel-00
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∂l λ = ∑ ( ∑y∈Y f k (y s ,
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incorrect [100]. Several sufficient
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