Shadow modelling and correction techniques in hyperspectral imaging. Issue 7 (1st March 2013)

• Record Type: Journal Article
• Authors: Roper, T.; Andrews, M.
• Is Part Of: Electronics letters. Volume 49:Issue 7(2013)
• Page Start: 458
• Page End: 460
• Publication Date: 2013-03-01
• Subjects: compensation -- image colour analysis -- lighting -- natural scenes -- hyperspectral imaging; conical sub‐simplex projection -- forced‐zero endmember -- shading effect -- hyperspectral data -- image formation -- linear mixture model -- shading compensation techniques -- quantitative image measurements -- nuisance value -- prevalence value -- image data -- nonuniform lighting -- scene topography -- illumination variations -- hyperspectral imaging -- correction techniques -- shadow modelling; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2012.4406
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Shadowing and illumination variations, caused by scene topography or non‐uniform lighting, are present in virtually all image data. Given its prevalence and nuisance value when making quantitative image measurements, the development of accurate shading compensation techniques is essential. The linear mixture model of image formation is broadly employed when dealing with hyperspectral data but makes no explicit provision for shading and this can lead to inaccurate analysis results. In this reported work, the effect of shading on a hyperspectral image is demonstrated, and new methods for mitigating the effect using a forced‐zero endmember and conical sub‐simplex projection are presented. It is shown that together they provide the most accurate and theoretically sound shadow‐corrected data.