Patent ID: 8026484

Claim:
An optical device comprising: a spatial filtering means for eliminating, from among the light rays arising from an observed scene, those which originate from a direction or a restricted range of directions in space, while allowing through the largest part of the light rays arising from said scene; means for varying the direction or the restricted range of directions in space in correspondence with which the spatial filtering means eliminates said light rays; a spectral dispersion means for imparting to the light rays arising from said spatial filtering means a deviation dependent on their wavelength; and an image detector for recording the light rays dispersed by said spectral dispersion means, each point of said image detector receiving light rays arising from said scene and exhibiting a different wavelength as a function of the direction in space from which they originate, wherein said spatial filtering means is adapted for eliminating, from among the light rays arising from an observed scene, those which originate from a restricted range of directions in space, not exceeding a tenth of the width of the visual field of the device.