Title :
Spectral smile correction in CRISM hyperspectral images
Author :
Ceamanos, Xavier ; Douté, Sylvain
Author_Institution :
Lab. de Planetologie de Grenoble, Grenoble, France
Abstract :
The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is affected by an artifact common to pushbroom sensors: ldquospectral smilerdquo. As a consequence, both central wavelength and spectral resolution become dependent on the across-track position thus giving rise to a horizontal spatial modulation. The correction of CRISM spectral smile is addressed using a two-step correction. First, data is re-sampled to the so-called ldquosweet spotrdquo wavelengths. Secondly, the non-uniform spectral response width of the detection elements is overcome by mimicking an increase of resolution thanks to a spectral sharpening. Experiments show remarkable results regarding the decrease of smile energy.
Keywords :
aerospace instrumentation; image processing; modulation; spectrometers; CRISM hyperspectral images; CRISM spectral smile; Mars; central wavelength; compact reconnaissance imaging spectrometer; detection element; horizontal spatial modulation; nonuniform spectral response; pushbroom sensors; spectral resolution; spectral sharpening; spectral smile correction; two-step correction; Hyperspectral imaging; Hyperspectral sensors; Image processing; Instruments; Mars; Optical surface waves; Radiometry; Reconnaissance; Sensor phenomena and characterization; Spatial resolution; CRISM; Hyperspectral remote sensing; Mars; spectral smile;
Conference_Titel :
Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, 2009. WHISPERS '09. First Workshop on
Conference_Location :
Grenoble
Print_ISBN :
978-1-4244-4686-5
Electronic_ISBN :
978-1-4244-4687-2
DOI :
10.1109/WHISPERS.2009.5288992
