System and method for digital laser projection with contrast enhancement using Fourier filter

摘要

An optical filter that increases the contrast of an image produced using a spatial light modulator is positioned on the Fourier plane of the lens, which is configured to spatially Fourier transform the modulated light from the spatial light modulator; Includes an optical filter mask for filtering modulated light.The modulated light has a plurality of diffraction order, and the optical filter mask transmits at least one of the diffraction order of the modulated light and blocks the remaining portion of the modulated light.A method of improving the contrast of an image produced using a spatial light modulator is a spatial Fourier transform of modulated light from a spatial light modulator onto a Fourier plane, and at least one diffraction order of the modulated light transmitted through the Fourier plane Includes filtering the modulated light by blocking the rest of the modulated light at the Fourier plane.Diagram