PRINCIPAL COMPONENTS ANALYSIS BASED ILLUMINANT ESTIMATION

摘要

An image apparatus for providing an estimated illuminant of a scene and subsequently providing an adjusted image of the scene includes a capturing system and an illuminant database. The capturing system captures information for an input image of the scene. The input image is defined by a plurality of input colors. The illuminant database includes a separate subspace of information for a plurality of possible illuminants. The subspaces can be created from multi-dimensional color information from its respective possible illuminant that is computed using Principal Components Analysis. This allows for more accurate illuminant estimation of the scene and the use of Principal Components Analysis to generate the one or more subspaces allows for accurate and relatively easy generation of the subspaces. Additionally, the image apparatus can include a control system that compares the input colors to the subspaces in the illuminant database.