Automated model-based calibration of imaging spectrographs

Matjaž Kosec; Miran Bürmen; Dejan Tomaževič; Franjo Pernuš; Boštjan Likar

doi:10.1117/12.907780

28 February 2012 Automated model-based calibration of imaging spectrographs

Matjaž Kosec, Miran Bürmen, Dejan Tomaževič, Franjo Pernuš, Boštjan Likar

Proceedings Volume 8215, Design and Quality for Biomedical Technologies V; 82150A (2012) https://doi.org/10.1117/12.907780
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

Hyper-spectral imaging has gained recognition as an important non-invasive research tool in the field of biomedicine. Among the variety of available hyperspectral imaging systems, systems comprising an imaging spectrograph, lens, wideband illumination source and a corresponding camera stand out for the short acquisition time and good signal to noise ratio. The individual images acquired by imaging spectrograph-based systems contain full spectral information along one spatial dimension. Due to the imperfections in the camera lens and in particular the optical components of the imaging spectrograph, the acquired images are subjected to spatial and spectral distortions, resulting in scene dependent nonlinear spectral degradations and spatial misalignments which need to be corrected. However, the existing correction methods require complex calibration setups and a tedious manual involvement, therefore, the correction of the distortions is often neglected. Such simplified approach can lead to significant errors in the analysis of the acquired hyperspectral images. In this paper, we present a novel fully automated method for correction of the geometric and spectral distortions in the acquired images. The method is based on automated non-rigid registration of the reference and acquired images corresponding to the proposed calibration object incorporating standardized spatial and spectral information. The obtained transformation was successfully used for sub-pixel correction of various hyperspectral images, resulting in significant improvement of the spectral and spatial alignment. It was found that the proposed calibration is highly accurate and suitable for routine use in applications involving either diffuse reflectance or transmittance measurement setups.

Citation Download Citation

Matjaž Kosec, Miran Bürmen, Dejan Tomaževič, Franjo Pernuš, and Boštjan Likar "Automated model-based calibration of imaging spectrographs", Proc. SPIE 8215, Design and Quality for Biomedical Technologies V, 82150A (28 February 2012); https://doi.org/10.1117/12.907780

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KEYWORDS

Calibration

Imaging systems

Hyperspectral imaging

Spectrographs

Spectral calibration

Cameras

Image registration

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