Physics – Optics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..685..160b&link_type=abstract
IN: Infrared technology XII; Proceedings of the Meeting, San Diego, CA, Aug. 19, 20, 1986 (A88-12828 02-35). Bellingham, WA, Soc
Physics
Optics
Electro-Optics, Fourier Transformation, Image Processing, Infrared Detectors, Linear Systems, Point Spread Functions, Algorithms, Angular Velocity, Bessel Functions, Digital Techniques, Fortran
Scientific paper
Linear systems theory combined with Fourier transform techniques provides a powerful means to characterize electrooptical systems. A description and analysis are presented for a scanning IR system whose characteristic Point Spread Function (PSF) is space-variant. This peculiarity of the PSF arises from the scanning geometry; the IR sensor spins as it drops toward the ground. A system impulse response, or PSF, is derived from effects including diffraction, motion blur, chromatic aberration, and detector area. Other effects may be taken into account by cascading PSFs. Once the system PSF is determined, the output of the system is the convolution of the input irradiance with the PSF. Alternatively, the output is the familiar inverse Fourier transform of the product of transforms. However, the space-variance of the PSF makes the latter option impossible and the former difficult. The convolution progresses in a spiral manner, with the PSF width changing continuously. The method is tested using Fortran programs and a digital image processor. The digital images produced show expected results, revealing a marked increase in resolution as the sensor nears the ground.
Bates Timothy G.
Giles Michael K.
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