High dynamic range imaging method based on spectral modulation

The invention relates to a high dynamic range imaging method based on spectral modulation. Reflected light of a target scene is converged and then enters the light splitting system, obtained spectral information is divided into a detection light beam and an imaging light beam by the beam splitter, the detection light beam enters the image sensor, and the processing module processes the imaging light beam according to the spectral information of the target scene. A plurality of continuous spectrum modulation coding plates are generated according to the exposure time and the residence time to be increased and act on a digital micromirror DMD in sequence; an imaging light beam enters a digital micromirror DMD, the digital micromirror DMD is controlled to overturn through a spectrum modulation coding plate, so that the residence time of light rays with different spectral intensities in the imaging light beam is different, after spectrum modulation, the imaging light beam is subjected to light combination through