中文摘要：

位相编码技术是在非相干光学系统的出瞳处加入位相板,使得图像传感器上得到的图像对景深不敏感,通过对图像进行解码而获得清晰图像,实现扩大光学系统景深。文章针对对数位相板编码系统,分析了系统与波长相关的两个因素：位相板的位相调制量和系统色差,通过对比在不同离焦量和色差情况下两种波长的点扩散函数（point spread function,PSF）的形状、宽度和峰值相对偏移量等特性,以探讨系统的多色光成像性能。研究结果表明该技术如应用于多色光乃至宽光谱成像的光学系统,需校正光学系统的色差,否则将导致图像无法解码。

英文摘要：

The wavefront coding extension the depth of field（DOE） of an imaging system is by insert a phase plate into the pupil plane of a spatially incoherent imaging system,the encoded image can be digitally restored to produce a final image with improved depth dependent detail.To study the multicolor imaging performance of a logarithmic wavefront coding system,the phase and chromatic aberration variation with wavelength are analyzed,and characteristics such as shape,distribution and width of two wavelengths＇ PSF are compared.The research results show that if the chromatic aberration is excellently corrected then the technology can be used for multicolor even broadband spectrum DOE imaging system.Otherwise,the encode image can not be effectively decoded.