IEEE Trans Image Process - Self-crossing detection and location for parametric active contours.

Tópicos

{ imag(2675) segment(2577) method(1081) }
{ motion(1329) object(1292) video(1091) }
{ structur(1116) can(940) graph(676) }
{ can(774) often(719) complex(702) }
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{ patient(2837) hospit(1953) medic(668) }
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{ data(2317) use(1299) case(1017) }
{ age(1611) year(1155) adult(843) }
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{ signal(2180) analysi(812) frequenc(800) }
{ cost(1906) reduc(1198) effect(832) }
{ group(2977) signific(1463) compar(1072) }
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{ data(3008) multipl(1320) sourc(1022) }
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Resumo

Active contours are very popular tools for video tracking and image segmentation. Parameterized contours are used due to their fast evolution and have become the method of choice in the Sobolev context. Unfortunately, these contours are not easily adaptable to topological changes, and they may sometimes develop undesirable loops, resulting in erroneous results. To solve such topological problems, one needs an algorithm for contour self-crossing detection. We propose a simple methodology via simple techniques from differential topology. The detection is accomplished by inspecting the total net change of a given contour's angle, without point sorting and plane sweeping. We discuss the efficient implementation of the algorithm. We also provide algorithms for locating crossings by angle considerations and by plotting the four-connected lines between the discrete contour points. The proposed algorithms can be added to any parametric active-contour model. We show examples of successful tracking in real-world video sequences by Sobolev active contours and the proposed algorithms and provide ideas for further research.

Resumo Limpo

activ contour popular tool video track imag segment parameter contour use due fast evolut becom method choic sobolev context unfortun contour easili adapt topolog chang may sometim develop undesir loop result erron result solv topolog problem one need algorithm contour selfcross detect propos simpl methodolog via simpl techniqu differenti topolog detect accomplish inspect total net chang given contour angl without point sort plane sweep discuss effici implement algorithm also provid algorithm locat cross angl consider plot fourconnect line discret contour point propos algorithm can ad parametr activecontour model show exampl success track realworld video sequenc sobolev activ contour propos algorithm provid idea research

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