A new method for characterization and calibration of AOTF spectrometers and hyperspectral imaging systems was developed. Besides efficient and practical characterization and calibration, the proposed method enables simultaneous spectral resolution assessment over the entire imaging plane. The paper was published in the SCI journal with IF of 1.949, which ranks in the first quarter in many scientific fields.
COBISS.SI-ID: 7599956
Among the variety of available hyperspectral imaging systems, the line-scan technique stands out for its short acquisition time and good signal-to-noise ratio. However, due to imperfections in the camera lens and, in particular, optical components of the imaging spectrograph, the acquired images are spatially and spectrally distorted, which can significantly degrade the accuracy of the subsequent hyperspectral image analysis. In this work, we propose and evaluate an automated method for correction of spatial and spectral distortions introduced by a line-scan hyperspectral imaging system operating in the short wavelength infrared (SWIR) spectral range from 1000 nm to 2500 nm. The proposed method is based on non-rigid registration of the distorted and reference images corresponding to two passive calibration objects. The results of the validation show that the proposed method is accurate, efficient, and applicable for calibration of line-scan hyperspectral imaging systems. Moreover, the design of the method and of the calibration objects allows integration with systems operating in diffuse reflectance or transmittance modes.
COBISS.SI-ID: 9507924
A new method for geometrical calibration of hyperspectral imaging systems based on acousto-optic tunable filter (AOTF) was developed. The method enables rigid, affine and nonrigid registration of twodimensional images from tridimensional hyperspectal cube. The method is based on B-splines. The evaluation was carried out on hyperspectral images acquired by the AOTF. The results indicated the feasibility of geometrical calibration of hyperspectral imaging systems as the proposed calibration was found reliable and enable geometrical calibration with the sub-pixel accuracy.
COBISS.SI-ID: 7703892
A new method for spectral characterization of near-infrared acousto-optic tunable filter (AOTF) hyperspectral imaging systems using standard calibration materials was developed. The method is based on trans-illumination of standard material with broadband light source and automatic registration of the acquired and the reference spectra. The results indicated the accuracy in the order of 0.5 nm as well as high robustness and speed, which make the method suitable for routine characterization and validation of different hyperspectral imaging systems.
COBISS.SI-ID: 8262740
A method has been developed that improves the spectral resolution of spectrometers and hyperspectral imaging systems based on acoustic optic tunable filters. The method has been tested on the spectra of mercury-argon calibration lamp with spectral lines.
COBISS.SI-ID: 8105556