| 摘要 |
The present invention relates to a passive radiometric imaging device (10) and a corresponding method for scanning a scene (1) and reconstructing an image (6) of said scene (1). To provide an improved image quality, the proposed device comprises a radiometer (20) for detecting radiation (3) emitted in a predetermined spectral range from a plurality of spots (2) of said scene (1) to obtain a data set (7) of radiation samples (4) including at least one radiation sample per spot, and a processing means (30) for subsequently determining pixel values (5) of pixels of the image to be reconstructed, said processing means (30) comprising a cost calculation unit (40) configured to calculate costs for the radiation samples of said data sub-set (8) according to a predetermined cost function, said costs indicating the level of noise in the respective radiation sample, and an optimization unit (50) 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 respective data sub-set (8), by determining an extremum of energy values determined for different radiation samples or different groups of radiation samples of the respective data sub-set (8) by use of an energy function, said energy function forming a sum adding a first summand including the costs of the radiation sample or group of radiation samples, for which the energy value is determined, and a second summand taking account of the costs of at least one radiation sample or group of radiation samples of at least one neighboring data sub-set. |
