Treffer: Generic signboard detection in image and video.

by Shen Hua. ; Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. ; Includes bibliographical references (leaves 67-71). ; Abstracts in English and Chinese. ; Abstract --- p.i ; 摘要 --- p.iii ; Acknowledgments --- p.v ; Table of Contents --- p.vii ; List of Figures --- p.ix ; Chapter Chapter 1 --- Introduction --- p.1 ; Chapter 1.1 --- Object Detection --- p.2 ; Chapter 1.2 --- Signboard Detection --- p.3 ; Chapter Chapter 2 --- System Overview --- p.5 ; Chapter 2.1 --- What is the problem? --- p.5 ; Chapter 2.2 --- Review of previous work --- p.6 ; Chapter 2.3 --- System Outline --- p.8 ; Chapter Chapter 3 --- Preprocessing --- p.10 ; Chapter 3.1 --- Edge Detection --- p.11 ; Chapter 3.1.1 --- Gradient-Based Method --- p.11 ; Chapter 3.1.2 --- Laplacian of Gaussian --- p.14 ; Chapter 3.1.3 --- Canny edge detection --- p.15 ; Chapter 3.2 --- Corner Detection --- p.18 ; Chapter Chapter 4 --- Finding Candidate Lines --- p.22 ; Chapter 4.1 --- Hough Transform --- p.22 ; Chapter 4.1.1 --- What is Hough Transform --- p.22 ; Chapter 4.1.2 --- Parameter Space --- p.22 ; Chapter 4.1.3 --- Accumulator Array --- p.24 ; Chapter 4.2 --- Gradient-based Hough Transform --- p.25 ; Chapter 4.2.1 --- Direction of Gradient --- p.26 ; Chapter 4.2.2 --- Accumulator Array --- p.28 ; Chapter 4.2.3 --- Peaks in the accumulator array --- p.30 ; Chapter 4.2.4 --- Performance of Gradient-based Hough Transform --- p.32 ; Chapter Chapter 5 --- Signboards Locating --- p.35 ; Chapter 5.1 --- Line Verification --- p.35 ; Chapter 5.1.1 --- Line Segmentation --- p.35 ; Chapter 5.1.2 --- Density Checking --- p.37 ; Chapter 5.2 --- Finding Close Circuits --- p.40 ; Chapter 5.3 --- Remove Redundant Segments --- p.47 ; Chapter Chapter 6 --- Post processing --- p.54 ; Chapter Chapter 7 --- Experiments and Conclusion --- p.59 ; Chapter 7.1 --- Experimental Results --- p.59 ; Chapter 7.2 --- Conclusion --- p.66 ; Bibliography --- p.67