Passive radiometric imaging device and method

摘要

A passive radiometric imaging device and a corresponding method for scanning a scene and reconstructing an image of said scene provide an improved image quality. The device comprises a radiometer for detecting radiation and a processing means for subsequently determining pixel values of pixels of the image to be reconstructed. A cost calculation unit calculates costs for the radiation samples of said data sub-set according to a predetermined cost function, said costs indicating the level of noise in the respective radiation sample. An optimization unit determines a pixel value as a label value from a set of label values, a label indicating a radiation sample or a group of radiation samples of the respective data sub-set, by determining an extremum of energy values determined for different radiation samples or different groups of radiation samples of the respective data sub-set by use of an energy function.

主权项

1. A passive radiometric imaging device for scanning a scene and reconstructing an image of said scene, said device comprising:
a radiometer configured to detect radiation emitted in a predetermined spectral range from a plurality of spots of said scene to obtain a data set of radiation samples including at least one radiation sample per spot, and a processor configured to subsequently determine pixel values of pixels of the image to be reconstructed, said processor being adapted to determine a pixel value of one of said pixels from a data sub-set of a plurality of radiation samples from said data set, said data sub-set including the plurality of radiation samples detected at a spot corresponding to the one of said pixels, whose pixel value is to be determined, said processor functioning as
a cost calculation unit configured to calculate costs for the plurality of radiation samples of said data sub-set according to a cost function, said costs representing distances of the plurality of radiation samples of the data sub-set from at least one representative point determined within the data sub-set, andan optimization unit configured to determine a pixel value as a label value from a set of label values, a label indicating a radiation sample or a group of radiation samples of the data sub-set, by determining an extremum of energy values determined for different radiation samples or different groups of radiation samples of the data sub-set by using an energy function, said energy function forming a sum adding a first summand including the costs of the radiation sample or the group of radiation samples of the data sub-set, for which an energy value is determined, and a second summand taking account of other costs of at least one radiation sample or group of radiation samples of at least one neighboring data sub-set.