An encoding method of encoding spectral imager aperture

The present invention discloses a method of encoding a coded aperture spectral imager, the method comprising: determining a number of coding aperture of the optical system according to cell size field, and a focal length of the detector; and a predetermined amount of light according to the encoded number of coded aperture design group N one-dimensional vector, each of the N groups of one-dimensional vector orthogonal transform, then the inverse operation, and reject inverse resultant operation matrix contains a one-dimensional infinite element or infinitesimal element vector, to obtain a set of M-dimensional vector can be recycled; wherein, M circulation matrix processing, then inverse transform matrix orthogonal transform for each newly generated, complete cycle dimensional orthogonal transform coding self. By the encoding method disclosed in the present invention, a coded aperture increases practicality spectral imager can provide multi-band spectral light field area array modulation and transmission imaging space.