Cheng Dewen, Liu Yue, Chen Hailong, Chen Chen, Wang Yongtian
Appl Opt. 2023 Oct 10;62(29):7837-7843. doi: 10.1364/AO.495605.
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 (<1 ) 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 (<1) and illumination uniformity (>90). The structure similarity index measure for the projection images shows close or greater than 0.9 correlation.
超短焦投影仪（UTP）技术一直是大视场和短距离投影领域具有挑战性的研究重点。在本文中，我们提出了一种基于图像预校正的曲面目标UTP设计方法。提出了一种使用径向基函数的预失真方法（<1 ）来有效校正不规则失真。采用灰度预校正方法来解决光照分布不均匀的问题。我们提供了一个UTP设计示例，并使用两种不同的曲面目标（非球面和自由曲面）验证了校正方法，证明了有效的失真校正（<1）和光照均匀性（>90）。投影图像的结构相似性指数测量显示相关性接近或大于0.9。
