Patent ID: 8902316
Filing Date: 2014-12-02
Classification: G01J,H04N

Abstract:
1. A method for correcting images produced by an array of bolometers of a detector without temperature regulation, said array including a retina of bolometric membranes arranged in the focal plane of optics and suspended above a substrate in which there is formed a readout circuit that outputs a stream of raw signal values that correspond to each bolometer in the array in relation to an observed scene, with the detector also including a shutter arranged between the optics and the retina, the method comprising, in an operating mode in which the ambient temperature conditions of the detector are free to change: a first step of closing the shutter and acquiring and storing in a memory of the detector: a second step of determining and storing, in the memory of the detector, an offset correction table for the current temperature of the detector as a function of: a third step of correcting the stream of raw values using the offset correction table, wherein the method further comprises, subsequent to the acquisition of a current raw value table, a maintenance process for maintaining of the current set of raw value tables, including: testing a condition for replacing a table of said current set with the current raw value table; and if said condition is met, replacing the table of said current set of tables with the current raw value table and replacing the acquisition temperature of the replaced table with the acquisition temperature of the current raw value table, said test including the determination, on the basis of at least one predetermined criterion, of whether there is a new set of tables obtained by replacing a table from the current set with the current table that is more relevant than the current set to subsequent determination of the offset table.