The magnitude of this effect is quantified, and its nature can be understood from the spectral difference of sunlight and skylight. An algebraic mapping is introduced in order to generate a spectral descriptor which is invariant against these spectral changes as caused by surface tilts. The performance of this spectral invariant is checked on simulated and real multispectral imagery. The application potential of the parameter-free and fast-computable invariant lies in digital image processing such as multispectral classification, change detection etc.
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