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.