基于数字全息图的频谱平面滤波及像平面滤波技术，最近出现两种可变放大率的物光波前重建方法。为适应数字全息精细检测的要求，对两种滤波方法进行了研究，导出让局部重建图像布满重建平面的表达式。研究结果表明，像平面滤波技术优于频谱平面滤波技术，基于像平面滤波技术的重建方法能够按照需要的放大率高质量地重建局部物光场。给出彩色数字全息波前重建实例。

Based on frequency spectrum plane filtering technique and image plane filtering technique to digital hologram, two methods of object wavefront reconstruction with adjustable magnification appear recently. In order to meet the demand of digital holographic exact detecting, the two filtering methods are researched, and the expression that makes reconstructed plane replete with local reconstructed image is deduced. The research results indicate that image plane filtering technique is better than frequency spectrum plane filtering technique. The reconstruction method based on image plane filtering technique is a high quality reconstructing method, which can reconstruct local object wavefront according to magnification needed. The example of color digital holographic wavefront reconstruction is given.