Passive ranging and a three-dimensional imaging system through wavefront coding

• 来源期刊: 中国物理B（英文版）
• 关键词: imaging systems image processing wavefront encoding
• 年，卷（期）: 2018,（5）
• 页码范围: 234-240
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/5/054205

摘要

A single-image passive ranging and three-dimensional (3D) imaging system with chiral phase encoding was proposed in 2011 [Opt.Lett.36,115 (2011)].A new theoretical analysis of the system in space domain is presented in this paper.We deduce the analytic relationships between the object distance and the point spread function,and between the object distance and the encoded image,respectively.Both the point spread function and the processed spectrum of the encoded image have two spots,which will rotate with the variation of the object distance.Then the depth map is extracted from the encoded image and it can be used to set up 3D images.The theoretical analysis is verified by a wavefront coding system with a chiral phase which is generated by a phase-only liquid-crystal spatial light modulator.The phase generated by the liquid-crystal spatial light modulator is more flexible than the fixed phase mask and can be adjusted in real time.It is especially suitable for observing the object with a large depth of field.