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On the illumination invariance of the level lines under directed light. Application to change detection.

Pierre Weiss 1, Alexandre Fournier 1, Laure Blanc-Féraud 1, Gilles Aubert 1

(2008)

We analyze the illumination invariance of the level lines of an image. We show that if the scene surface has Lambertian reflectance and the light is directed, then a necessary condition for the level lines to be illumination invariant is that the 3D scene be developable and that its albedo satisfies some geometrical constraints. We then show that the level lines are ``almost'' invariant for piecewise developable surfaces. Such surfaces fit most of the urban structures. In a second part, this allows us to devise a very fast algorithm that detects changes between pairs of remotely sensed images of urban areas, independently of the lighting conditions. We show the effectiveness of the algorithm both on synthetic OpenGL scenes and real Quickbird images. We compare the efficiency of the proposed algorithm with other classical approaches and show that it is superior both in practice and in theory.

1:	ARIANA (INRIA Sophia Antipolis / Laboratoire I3S)
	INRIA – Université de Nice Sophia Antipolis (UNS) – CNRS : UMR7271

Domain

:

Computer Science/Signal and Image Processing Mathematics/Differential Geometry Computer Science/Image Processing Engineering Sciences/Signal and Image processing

Keywords: Level lines – topographic map – illumination invariance – contrast equalization – change detection – remote sensing

inria-00310383, version 1

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From: Pierre Weiss <>

Submitted on: Friday, 8 August 2008 14:40:40

Updated on: Friday, 8 August 2008 18:23:05