Abstract
Ultrashort throw projector (UTP) technology has been a challenging research focus in the fields of large field of view and short-distance projection. In this paper, we propose a design method for a curved-target UTP based on image precorrection. A predistortion method (${\lt}{1}\;{\rm pixel}$) using a radial basis function is presented to effectively correct irregular distortion. A grayscale precorrection method is used to address uneven illumination distribution. We provide a UTP design example and verify the correction methods using two different curved targets (aspherical and freeform), demonstrating effective distortion correction (${\lt}{1}\%$) and illumination uniformity (${\gt}{90}\%$). The structure similarity index measure for the projection images shows close or greater than 0.9 correlation.
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