4 November 2004 SPOT5 MTF measurement using biresolution images
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Abstract
One method to assess in-flight Modulation Transfer Function (MTF) relies on couples of images of the same landscape acquired with two spatial resolutions. For each couple, the higher resolution image stands for the landscape so that the ratio of the spectra obtained by FFT of the two images, gives the lower resolution sensor MTF. Last studies of this method have given the opportunity to correct the results from the aliasing effect usually disturbing the measurements around Nyquist frequency. This paper begins with a brief recall of the method including the aliasing correction. The next step presents the data to be processed. The method requires couples of images. In the SPOT5 case, several kinds of couples are constituted: (HX/THR), (THR/airborne image) and (HRS/THR). The presentation of the corresponding results naturally follows. Last part of the paper consists in a comparison with SPOT5 measurements given by other methods: least square method, edge method and point source method for the THR.
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Francoise Viallefont-Robinet, Francoise Viallefont-Robinet, Elodie Cansot, Elodie Cansot, } "SPOT5 MTF measurement using biresolution images", Proc. SPIE 5570, Sensors, Systems, and Next-Generation Satellites VIII, (4 November 2004); doi: 10.1117/12.564854; https://doi.org/10.1117/12.564854
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