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1 May 2012 Change image detection under unknown affine transformations of intensity
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Image change detection in the presence of unknown non-uniform intensity transformations is addressed. Multiplicative and additive uniform intensity transformations in image difference are solved using operators based on local vector space geometry. We now generalize this method for situations where a linear intensity gradient across the image can be present. This situation can occur in active illumination systems or when curved surfaces are illuminated from a source at an angle away from the line of sight. The method proposed is based on calculating geometrical functions by projecting the local vectors upon a certain subspace defined by the reference. Various experiments are carried out to confirm the correct image detection. In addition, all difference local operators are defined in terms of correlations which can be useful for optical implementations using conventional Vander Lugt or joint transform correlators.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pascuala García-Martínez and Henri H. Arsenault "Change image detection under unknown affine transformations of intensity", Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 843615 (1 May 2012);

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