Method for improving the detection capacities of a multispectral imaging system , said multispectral imaging system including a bi-telecentric imaging system comprising, in a longitudinal direction (longitudinal axis Z), the following successive components: - a first lens , - a pupil located in the rear focal plane of said first lens , - a second lens the focal length of which coincides with the position of said pupil, - a micro-lens array , of identical focal lengths, located in the rear focal plane of said second lens , - a spectral filter array paired with said micro-lens array , - and a sensor sensitive to the radiation to be detected and located in the rear focal plane of said micro-lens array , characterized in that it comprises: - a step of calibrating the multispectral imaging system, in which a calibration target, placed at the level of the aforesaid pupil , is used, said calibration target comprising at least two windows, of transverse dimensions at least equal to those of said pupil , said windows being able to be placed alternately in front of said pupil of said multispectral imaging system , so that each window covers the entire opening of said pupil , said first window containing a first panel from which originates radiation at a first wavelength in the spectral range measurable by said sensor and said second window containing a second panel from which originates radiation at a second wavelength wave in the spectral domain measurable by said sensor, and a step of implementing a controlled jitter, that is to say a shift of fixed amplitude and frequency, of at least one of the components of said multispectral imaging system , in order to carry out a detection, synchronized on the signal detected by the aforesaid sensor, of radiation having passed through the multispectral imaging system . - a first lens , - a pupil located in the rear focal plane of said first lens , - a second lens the focal length of which coincides with the position of said pupil, - a micro-lens array , of identical focal lengths, located in the rear focal plane of said second lens , - a spectral filter array paired with said micro-lens array , - and a sensor sensitive to the radiation to be detected and located in the rear focal plane of said micro-lens array , - a step of calibrating the multispectral imaging system, in which a calibration target, placed at the level of the aforesaid pupil , is used, said calibration target comprising at least two windows, of transverse dimensions at least equal to those of said pupil , said windows being able to be placed alternately in front of said pupil of said multispectral imaging system , so that each window covers the entire opening of said pupil , said first window containing a first panel from which originates radiation at a first wavelength in the spectral range measurable by said sensor and said second window containing a second panel from which originates radiation at a second wavelength wave in the spectral domain measurable by said sensor, and a step of implementing a controlled jitter, that is to say a shift of fixed amplitude and frequency, of at least one of the components of said multispectral imaging system , in order to carry out a detection, synchronized on the signal detected by the aforesaid sensor, of radiation having passed through the multispectral imaging system . <EOS>