Ah. Lettington et Qh. Hong, SUPERRESOLUTION TECHNIQUE WITH EDGE-BASED RINGING REDUCTION FOR PASSIVE MILLIMETER-WAVE IMAGES, IEE proceedings. Vision, image and signal processing, 141(1), 1994, pp. 9-12
Images obtained by passive millimetre-wave systems are heavily blurred
and band-limited owing to diffraction. A superresolution algorithm ha
s been developed to improve their spatial resolution beyond the diffra
ction limit. Initially the spectrum of an image is restored within the
passband but the resulting image then contains strong ringing owing t
o the lack of higher spatial frequencies. These ringing artifacts are
then reduced using a piecewise-linear model which identifies and resto
res sharp edges, so introducing higher spatial frequencies beyond the
passband. This method has been applied to synthetised and real millime
tre-wave images, but may have applications in other fields such as in
magnetic-resonance imaging.